/* ==========================================================================
   MultiModelMagic.com — Design System
   Light Theme | Modern SaaS
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* ---- Primary ---- */
  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-primary-light: #EEF2FF;
  --color-primary-rgb: 79, 70, 229;

  /* ---- Accent ---- */
  --color-accent: #7C3AED;
  --color-accent-hover: #6D28D9;
  --color-accent-light: #F5F3FF;
  --color-accent-rgb: 124, 58, 237;

  /* ---- Semantic ---- */
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-success-border: #A7F3D0;
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-warning-border: #FDE68A;
  --color-error: #EF4444;
  --color-error-bg: #FEF2F2;
  --color-error-border: #FECACA;
  --color-info: #3B82F6;
  --color-info-bg: #EFF6FF;
  --color-info-border: #BFDBFE;

  /* ---- Surfaces ---- */
  --color-bg: #F9FAFB;
  --color-card: #FFFFFF;
  --color-section: #F3F4F6;
  --color-dark: #111827;

  /* ---- Typography ---- */
  --color-text: #111827;
  --color-text-secondary: #374151;
  --color-text-muted: #6B7280;
  --color-text-inverse: #FFFFFF;

  /* ---- Borders ---- */
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;

  /* ---- Font Families ---- */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* ---- Font Sizes ---- */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* ---- Font Weights ---- */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* ---- Line Heights ---- */
  --leading-tight: 1.25;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* ---- Spacing ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* ---- Border Radius ---- */
  --radius-sm: 0.25rem;
  --radius: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* ---- Shadows ---- */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 6px 12px -2px rgba(0, 0, 0, 0.08), 0 3px 7px -3px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.1), 0 4px 10px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 40px -5px rgba(0, 0, 0, 0.12), 0 8px 16px -6px rgba(0, 0, 0, 0.05);
  --shadow-primary: 0 4px 14px rgba(79, 70, 229, 0.25);

  /* ---- Z-Index ---- */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-sidebar: 500;
  --z-navbar: 1000;
  --z-modal-backdrop: 1400;
  --z-modal: 1500;
  --z-toast: 1600;
  --z-tooltip: 1700;

  /* ---- Transitions ---- */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* ---- Layout ---- */
  --navbar-height: 64px;
  --sidebar-width: 380px;
  --container-max: 1400px;
}


/* ==========================================================================
   2. Reset & Base
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  tab-size: 4;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-bg);
}

/* ---- Selection ---- */
::selection {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

img,
video,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

ul,
ol {
  list-style: none;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}


/* ==========================================================================
   3. Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--text-4xl);
  letter-spacing: -0.025em;
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
}

h6 {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

p:last-child {
  margin-bottom: 0;
}

strong, b {
  font-weight: var(--font-semibold);
}

small {
  font-size: var(--text-sm);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-section);
  color: var(--color-accent);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--color-dark);
  color: #E5E7EB;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-6) 0;
  background-color: var(--color-primary-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
}

blockquote p {
  margin-bottom: 0;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-success {
  color: var(--color-success);
}

.text-warning {
  color: var(--color-warning);
}

.text-error {
  color: var(--color-error);
}

.text-info {
  color: var(--color-info);
}

.text-primary {
  color: var(--color-primary);
}

.text-accent {
  color: var(--color-accent);
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lead {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}


/* ==========================================================================
   4. Layout
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.page-content {
  padding-top: calc(var(--navbar-height) + var(--space-8));
  padding-bottom: var(--space-16);
  min-height: calc(100vh - var(--navbar-height));
}

.section {
  padding: var(--space-20) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

/* ---- Grid ---- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* ---- Flex ---- */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-end {
  justify-content: flex-end;
}

.flex-1 {
  flex: 1;
}

.flex-shrink-0 {
  flex-shrink: 0;
}

/* ---- Gap ---- */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }


/* ==========================================================================
   5. Navigation
   ========================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-navbar);
  display: flex;
  align-items: center;
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar .container,
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---- Brand ---- */
.nav-brand,
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand:hover,
.navbar-logo:hover {
  color: var(--color-text);
}

.nav-brand img,
.nav-brand svg,
.navbar-logo-icon {
  width: 32px;
  height: 32px;
}

.nav-brand-text,
.navbar-logo-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- Links ---- */
.nav-links,
.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-4);
  right: var(--space-4);
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full) var(--radius-full) 0 0;
}

/* ---- Auth-aware visibility ---- */
/* Default: hide auth elements, show public */
.nav-link--auth,
.navbar-actions--auth { display: none; }
.nav-link--public,
.navbar-actions--public { display: flex; }

/* Logged in: hide public, show auth */
body.logged-in .nav-link--auth { display: flex; }
body.logged-in .navbar-actions--auth { display: flex; }
body.logged-in .nav-link--public,
body.logged-in .navbar-actions--public { display: none; }

/* ---- Navbar actions (right side) ---- */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.navbar-actions--public,
.navbar-actions--auth {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ---- Token balance badge (navbar) ---- */
.navbar .token-balance {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px 4px 8px;
  background: linear-gradient(135deg, rgba(99,102,241,0.10), rgba(139,92,246,0.10));
  border: 1px solid rgba(99,102,241,0.18);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  height: 34px;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.navbar .token-balance:hover {
  background: linear-gradient(135deg, rgba(99,102,241,0.18), rgba(139,92,246,0.18));
  border-color: rgba(99,102,241,0.30);
}

.navbar .token-balance-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.navbar .token-balance-amount {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* ---- User menu ---- */
.user-menu {
  position: relative;
}

.user-menu-trigger {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  background: var(--color-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.user-menu-trigger:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.user-menu-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  min-width: 200px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.user-menu-dropdown--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.user-menu-item:hover {
  background-color: var(--color-section);
  color: var(--color-text);
}

.user-menu-item--danger {
  color: var(--color-error);
}

.user-menu-item--danger:hover {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}

.user-menu-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-2) 0;
}

/* ---- Mobile Hamburger ---- */
.navbar-hamburger {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: none;
  background: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: var(--space-2);
}

.hamburger-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-secondary);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.navbar-hamburger--active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar-hamburger--active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.navbar-hamburger--active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Mobile open state ---- */
.navbar-links--open {
  display: flex !important;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  bottom: 0;
  flex-direction: column;
  background-color: var(--color-card);
  z-index: calc(var(--z-navbar) - 1);
  padding: var(--space-6);
  overflow-y: auto;
  gap: var(--space-1);
}

.navbar-links--open .nav-link {
  width: 100%;
  height: auto;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
}

.navbar-links--open .nav-link.active::after {
  display: none;
}

.nav-mobile-menu .nav-link.active {
  background-color: var(--color-primary-light);
}


/* ==========================================================================
   6. Footer
   ========================================================================== */

.site-footer {
  background-color: var(--color-dark);
  color: #9CA3AF;
  padding: 0 0 var(--space-8);
}

/* Footer feature blocks (SEO section) */
.footer-features {
  background-color: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--space-12) var(--space-6);
}

.footer-features-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
}

.footer-feature-block h3 {
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.footer-feature-block p {
  color: #6B7280;
  font-size: 0.8rem;
  line-height: var(--leading-relaxed);
}

/* Footer keyword paragraph (SEO) */
.footer-keywords {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--space-6) var(--space-6);
}

.footer-keywords-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-keywords-inner p {
  color: #4B5563;
  font-size: 0.75rem;
  line-height: var(--leading-relaxed);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--space-10);
  max-width: var(--max-width);
  margin: 0 auto var(--space-10);
  padding: var(--space-12) var(--space-6) 0;
}

.footer-brand,
.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-inverse);
  text-decoration: none;
  margin-bottom: var(--space-4);
}

.footer-logo svg {
  flex-shrink: 0;
}

.footer-brand-desc,
.footer-tagline {
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.footer-description {
  color: #9CA3AF;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.footer-heading {
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-5);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-link,
.footer-links a {
  color: #9CA3AF;
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-links a:hover {
  color: var(--color-text-inverse);
}

.footer-links li {
  list-style: none;
}

.footer-social {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background-color: rgba(255, 255, 255, 0.05);
  color: #9CA3AF;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.footer-social a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-text-inverse);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--space-8) var(--space-6) 0;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-6);
}

.footer-bottom-links a {
  color: #9CA3AF;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: var(--color-text-inverse);
}


/* ==========================================================================
   7. Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:active {
  transform: translateY(0);
}

/* ---- Variants ---- */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-xs);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

.btn-secondary {
  background-color: var(--color-section);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-border);
  color: var(--color-text);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-success {
  background-color: var(--color-success);
  color: var(--color-text-inverse);
}

.btn-success:hover {
  background-color: #059669;
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.25);
}

.btn-danger {
  background-color: var(--color-error);
  color: var(--color-text-inverse);
}

.btn-danger:hover {
  background-color: #DC2626;
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.25);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover,
.btn--ghost:hover {
  background-color: var(--color-section);
  color: var(--color-text);
  transform: translateY(-1px);
}

/* BEM aliases */
.btn--primary { background-color: var(--color-primary); color: var(--color-text-inverse); box-shadow: var(--shadow-xs); }
.btn--primary:hover { background-color: var(--color-primary-hover); color: var(--color-text-inverse); transform: translateY(-1px); box-shadow: var(--shadow-primary); }
.btn--ghost { background-color: transparent; color: var(--color-text-secondary); }
.btn--secondary { background-color: var(--color-section); color: var(--color-text-secondary); border-color: var(--color-border); }
.btn--danger { background-color: var(--color-error); color: var(--color-text-inverse); }
.btn--outline { background-color: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--success { background-color: var(--color-success); color: var(--color-text-inverse); }

/* ---- Sizes ---- */
.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--text-xs);
  border-radius: var(--radius);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-icon.btn-sm {
  width: 32px;
  height: 32px;
}

.btn-icon.btn-lg {
  width: 48px;
  height: 48px;
}

/* ---- States ---- */
.btn:disabled,
.btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}

.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

/* ---- Button Group ---- */
.btn-group {
  display: inline-flex;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.btn-group .btn + .btn {
  margin-left: -1px;
}


/* ==========================================================================
   8. Forms
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-label-required::after {
  content: ' *';
  color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: #D1D5DB;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%236B7280' d='M4.427 6.427l3.396 3.396a.25.25 0 00.354 0l3.396-3.396A.25.25 0 0011.396 6H4.604a.25.25 0 00-.177.427z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 16px;
  padding-right: 2.5rem;
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* ---- Checkbox & Radio ---- */
.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.form-checkbox input,
.form-radio input {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  background-color: var(--color-card);
  flex-shrink: 0;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-checkbox input {
  border-radius: var(--radius-sm);
}

.form-radio input {
  border-radius: var(--radius-full);
}

.form-checkbox input:checked,
.form-radio input:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-checkbox input:checked {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='white' d='M10.28 2.28L4.5 8.06 1.72 5.28a.75.75 0 00-1.06 1.06l3.5 3.5a.75.75 0 001.06 0l6.5-6.5a.75.75 0 00-1.06-1.06z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.form-radio input:checked {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'%3E%3Ccircle cx='4' cy='4' r='3' fill='white'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.form-checkbox input:focus-visible,
.form-radio input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ---- Hints & Errors ---- */
.form-hint {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-error {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* ---- Input Group ---- */
.input-group {
  display: flex;
  align-items: stretch;
}

.input-group .form-input {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  border-right: none;
}

.input-group .btn {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  flex-shrink: 0;
}

.input-group-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  background-color: var(--color-section);
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  color: var(--color-text-muted);
}

.input-group-icon + .form-input {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}


/* ==========================================================================
   9. Cards
   ========================================================================== */

.card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header-title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: 0;
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.card-hover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}


/* ==========================================================================
   10. Paper Tiles (Agent Output Cards)
   ========================================================================== */

.paper-tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: var(--space-6);
}

.paper-tile {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: relative;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.paper-tile:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px) scale(1.005);
}

/* ---- Status Borders ---- */
.paper-tile--ready {
  border-top: 3px solid var(--color-info);
}

.paper-tile--processing {
  border-top: 3px solid var(--color-warning);
  animation: tileProcessingPulse 2s ease-in-out infinite;
}

.paper-tile--complete {
  border-top: 3px solid var(--color-success);
}

.paper-tile--error {
  border-top: 3px solid var(--color-error);
}

@keyframes tileProcessingPulse {
  0%, 100% { border-top-color: var(--color-warning); }
  50% { border-top-color: #FCD34D; }
}

/* ---- Tile Header ---- */
.paper-tile-header {
  padding: var(--space-5) var(--space-6);
  padding-right: 5rem;
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.paper-tile-agent-name {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.paper-tile-model {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

/* ---- Tile Body ---- */
.paper-tile-body {
  padding: var(--space-6);
  max-height: 400px;
  overflow-y: auto;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.paper-tile-body::-webkit-scrollbar {
  width: 4px;
}

.paper-tile-body::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

/* ---- Tile Footer ---- */
.paper-tile-footer {
  padding: var(--space-3) var(--space-6);
  border-top: 1px solid var(--color-border-light);
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.paper-tile-footer-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.paper-tile-footer-time {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ---- Score Badge ---- */
.paper-tile-score {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-text-inverse);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow);
}

.paper-tile-score--high {
  background: linear-gradient(135deg, var(--color-success), #34D399);
}

.paper-tile-score--mid {
  background: linear-gradient(135deg, var(--color-warning), #FBBF24);
  color: var(--color-text);
}

.paper-tile-score--low {
  background: linear-gradient(135deg, var(--color-error), #F87171);
}


/* ==========================================================================
   11. Badges & Tags
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2em 0.65em;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}

.badge-info {
  background-color: var(--color-info-bg);
  color: var(--color-info);
}

.badge-neutral {
  background-color: var(--color-section);
  color: var(--color-text-muted);
}

/* ---- Tags ---- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  background-color: var(--color-section);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.tag-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tag-remove:hover {
  background-color: var(--color-error-bg);
  color: var(--color-error);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}


/* ==========================================================================
   12. Modal
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  z-index: var(--z-modal);
  transform: translateY(20px) scale(0.97);
  transition: transform var(--transition-base);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: 0;
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-section);
  color: var(--color-text);
}

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.modal-lg {
  max-width: 800px;
}

.modal-sm {
  max-width: 420px;
}


/* ==========================================================================
   13. Tables
   ========================================================================== */

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-weight: var(--font-semibold);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
}

.table tr:last-child td {
  border-bottom: none;
}

.table-striped tbody tr:nth-child(even) {
  background-color: var(--color-bg);
}

.table-hover tbody tr {
  transition: background-color var(--transition-fast);
}

.table-hover tbody tr:hover {
  background-color: var(--color-primary-light);
}


/* ==========================================================================
   14. Alerts & Toasts
   ========================================================================== */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid;
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.alert-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.alert-dismiss {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  opacity: 0.5;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.alert-dismiss:hover {
  opacity: 1;
}

.alert-success {
  background-color: var(--color-success-bg);
  border-color: var(--color-success-border);
  color: #065F46;
}

.alert-warning {
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: #92400E;
}

.alert-error {
  background-color: var(--color-error-bg);
  border-color: var(--color-error-border);
  color: #991B1B;
}

.alert-info {
  background-color: var(--color-info-bg);
  border-color: var(--color-info-border);
  color: #1E40AF;
}

/* ---- Toasts ---- */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 320px;
  max-width: 480px;
  font-size: var(--text-sm);
  pointer-events: auto;
  animation: toastSlideIn var(--transition-slow) ease-out;
}

.toast-success { border-left: 4px solid var(--color-success); }
.toast-warning { border-left: 4px solid var(--color-warning); }
.toast-error { border-left: 4px solid var(--color-error); }
.toast-info { border-left: 4px solid var(--color-info); }

.toast.removing {
  animation: toastSlideOut var(--transition-base) ease-in forwards;
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toastSlideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}


/* ==========================================================================
   15. Tabs
   ========================================================================== */

.tabs {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab-item {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tab-item:hover {
  color: var(--color-text-secondary);
}

.tab-item.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  display: none;
  padding: var(--space-6) 0;
  animation: fadeIn var(--transition-base);
}

.tab-content.active {
  display: block;
}

/* ---- Pill Tabs Variant ---- */
.tabs-pills {
  border-bottom: none;
  background-color: var(--color-section);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
}

.tabs-pills .tab-item {
  border-bottom: none;
  border-radius: var(--radius-md);
  margin-bottom: 0;
}

.tabs-pills .tab-item.active {
  background-color: var(--color-card);
  color: var(--color-text);
  box-shadow: var(--shadow-xs);
}


/* ==========================================================================
   16. Progress
   ========================================================================== */

/* ---- Bar ---- */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--color-section);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.progress-bar-fill--success {
  background: var(--color-success);
}

.progress-bar-fill--warning {
  background: var(--color-warning);
}

.progress-bar-fill--error {
  background: var(--color-error);
}

.progress-bar-sm { height: 4px; }
.progress-bar-lg { height: 12px; }

.progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
}

/* ---- Circle (SVG) ---- */
.progress-circle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.progress-circle svg {
  transform: rotate(-90deg);
}

.progress-circle-bg {
  fill: none;
  stroke: var(--color-section);
}

.progress-circle-fill {
  fill: none;
  stroke: var(--color-primary);
  stroke-linecap: round;
  transition: stroke-dashoffset 0.5s ease;
}

.progress-circle-fill--success { stroke: var(--color-success); }
.progress-circle-fill--warning { stroke: var(--color-warning); }
.progress-circle-fill--error { stroke: var(--color-error); }

.progress-circle-text {
  position: absolute;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-text);
}

.progress-circle-text--lg {
  font-size: var(--text-xl);
}


/* ==========================================================================
   17. Landing Page
   ========================================================================== */

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: var(--space-24) 0 var(--space-16);
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 140%;
  background: radial-gradient(ellipse at 30% 20%, rgba(var(--color-primary-rgb), 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(var(--color-accent-rgb), 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: var(--font-extrabold);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  animation: fadeIn 0.6s ease-out;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-10);
  line-height: var(--leading-relaxed);
  animation: fadeIn 0.6s ease-out 0.15s both;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  animation: fadeIn 0.6s ease-out 0.3s both;
}

.hero-cta .btn {
  padding: 0.875rem 2rem;
  font-size: var(--text-base);
}

/* ---- Feature Grid ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.feature-card {
  text-align: center;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  color: var(--color-primary);
}

.feature-card-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-3);
}

.feature-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* ---- Stats Row ---- */
.stats-row {
  display: flex;
  justify-content: center;
  gap: var(--space-16);
  padding: var(--space-12) 0;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: var(--font-medium);
}

/* ---- Testimonial ---- */
.testimonial-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
}

.testimonial-card::before {
  content: '\201C';
  font-size: 4rem;
  line-height: 1;
  color: var(--color-primary-light);
  position: absolute;
  top: var(--space-4);
  left: var(--space-6);
}

.testimonial-quote {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
  padding-top: var(--space-4);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  flex-shrink: 0;
}

.testimonial-name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.testimonial-role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ---- Section Dark ---- */
.section-dark {
  background-color: var(--color-dark);
  color: var(--color-text-inverse);
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--color-text-inverse);
}

.section-dark p {
  color: #9CA3AF;
}

.section-dark .stat-value {
  color: var(--color-text-inverse);
}


/* ==========================================================================
   18. Pipeline Visualization
   ========================================================================== */

.pipeline {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding: var(--space-6) 0;
  -webkit-overflow-scrolling: touch;
}

.pipeline-stage {
  flex-shrink: 0;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  min-width: 180px;
  text-align: center;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.pipeline-stage:hover {
  box-shadow: var(--shadow);
  border-color: var(--color-primary);
}

.pipeline-stage.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

.pipeline-stage.completed {
  border-color: var(--color-success);
}

.pipeline-stage-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.pipeline-stage-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.pipeline-arrow {
  flex-shrink: 0;
  width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-border);
}

.pipeline-arrow svg {
  width: 24px;
  height: 24px;
}

.pipeline-arrow.active {
  color: var(--color-primary);
}

.pipeline-model-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.65rem;
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  margin-top: var(--space-2);
  font-family: var(--font-mono);
}


/* ==========================================================================
   19. Sidebar (Engine Page)
   ========================================================================== */

.sidebar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--navbar-height));
  background-color: var(--color-card);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  z-index: var(--z-sidebar);
  padding: var(--space-6);
  transition: transform var(--transition-slow);
}

.sidebar-section {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-section:last-child {
  border-bottom: none;
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: var(--space-2) 0;
  margin-bottom: var(--space-3);
}

.sidebar-section-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.sidebar-section-chevron {
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.sidebar-section.collapsed .sidebar-section-chevron {
  transform: rotate(-90deg);
}

.sidebar-section.collapsed .sidebar-section-body {
  display: none;
}

.sidebar-toggle {
  display: none;
  position: fixed;
  bottom: var(--space-6);
  left: var(--space-6);
  z-index: calc(var(--z-sidebar) + 1);
}

/* ---- Content With Sidebar ---- */
.with-sidebar {
  margin-left: var(--sidebar-width);
}

/* ---- Sidebar Header ---- */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-5);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-header h2 {
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---- Sidebar Body ---- */
.sidebar-body {
  flex: 1;
  overflow-y: auto;
}

/* ---- Sidebar Collapsed ---- */
.sidebar.collapsed {
  transform: translateX(-100%);
}

.sidebar.collapsed ~ .engine-main {
  margin-left: 0;
}


/* ==========================================================================
   19b. Engine Page Layout
   ========================================================================== */

/* ---- Engine Layout: sidebar + main ---- */
.engine-layout {
  display: flex;
  min-height: calc(100vh - var(--navbar-height));
  padding-top: var(--navbar-height);
  background: var(--color-bg);
}


/* ---- Engine Main Content ---- */
.engine-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--navbar-height));
}

/* ---- Prompt Bar ---- */
.engine-prompt-bar {
  position: sticky;
  top: var(--navbar-height);
  z-index: 10;
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-sm);
}

.engine-prompt-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 1200px;
  margin: 0 auto;
}

.engine-prompt-inner .form-textarea {
  min-height: 52px;
  resize: vertical;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
  border-color: var(--color-border);
  padding: var(--space-4);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.engine-prompt-inner .form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

.engine-prompt-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ---- Toolbar ---- */
.engine-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-6);
  background: var(--color-section);
  border-bottom: 1px solid var(--color-border-light);
}

/* ---- Agent Grid Area ---- */
.engine-main .paper-tile-grid {
  flex: 1;
  padding: var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  align-content: start;
}

/* ---- Empty State ---- */
.engine-empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 60vh;
  padding: var(--space-16) var(--space-8);
}

.engine-empty-state h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.engine-empty-state p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 440px;
  line-height: var(--leading-relaxed);
}

/* -- Empty State: Hero Icon with Animated Rings -- */
.empty-hero-icon {
  position: relative;
  width: 120px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-8);
}

.empty-icon-ring {
  position: absolute;
  border-radius: var(--radius-full);
  border: 2px solid;
}

.empty-icon-ring--outer {
  width: 120px;
  height: 120px;
  border-color: rgba(var(--color-primary-rgb), 0.1);
  animation: emptyRingPulse 3s ease-in-out infinite;
}

.empty-icon-ring--inner {
  width: 88px;
  height: 88px;
  border-color: rgba(var(--color-primary-rgb), 0.2);
  animation: emptyRingPulse 3s ease-in-out 0.5s infinite;
}

@keyframes emptyRingPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.08); opacity: 0.6; }
}

/* -- Empty State: Steps -- */
.empty-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-bottom: var(--space-10);
  max-width: 680px;
}

.empty-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.empty-step-number {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.empty-step-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.empty-step-content strong {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.empty-step-content span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

.empty-step-connector {
  width: 32px;
  height: 2px;
  background: var(--color-border);
  flex-shrink: 0;
  margin-top: 15px;
}

/* -- Empty State: Feature Pills -- */
.empty-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.empty-feature {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-section);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.empty-feature svg {
  flex-shrink: 0;
}

/* -- Engine: Create Agent Tiles -- */
.engine-create-tiles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  margin-bottom: var(--space-8);
  max-width: 960px;
}

.paper-tile--create {
  width: auto;
  height: auto;
  min-height: 200px;
  padding: var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-3);
  cursor: pointer;
}

.paper-tile--create:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}

.paper-tile-create-icon {
  padding: var(--space-4);
  background: var(--color-section);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.paper-tile-create-label {
  font-weight: var(--font-bold);
  font-size: var(--text-base);
  color: #111;
}

.paper-tile-create-desc {
  font-size: var(--text-xs);
  color: #666;
  line-height: 1.5;
}

/* -- Engine: Quick Examples -- */
.engine-examples {
  max-width: 700px;
  margin: 0 auto;
}

.engine-examples-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-3);
}

.engine-examples-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.engine-examples-row .btn {
  font-size: var(--text-xs);
}

/* Engine brand header */
.engine-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px 0;
}

.engine-brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.engine-brand-sub {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  border-left: 1px solid var(--color-border);
  padding-left: 8px;
  margin-left: 2px;
}

/* Engine prompt hint */
.engine-prompt-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 4px 0 0;
}

/* Quick model buttons */
.engine-model-quick-btns {
  display: flex;
  gap: 4px;
  margin-bottom: 6px;
}

.engine-model-quick-btns .btn {
  flex: 1;
  font-size: 0.7rem;
  padding: 3px 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Example tiles — large visual cards */
.engine-examples-tiles {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
}

.example-tile {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  overflow: hidden;
  min-height: 200px;
  display: flex;
  flex-direction: column;
}

.example-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.example-tile-label {
  padding: 10px 12px;
  font-weight: 600;
  font-size: 0.85rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

/* Book tile */
.example-tile--book {
  background: linear-gradient(135deg, #4a1942, #1a1a3e);
  border: none;
  position: relative;
}

.example-book-face {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px 16px;
  position: relative;
}

.example-book-face::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 6px;
  background: linear-gradient(to right, rgba(0,0,0,0.4), rgba(0,0,0,0.1));
  border-radius: 0 2px 2px 0;
}

.example-book-title {
  font-family: 'Inter', serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: #c9a227;
  text-align: center;
  line-height: 1.2;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.example-book-meta {
  color: rgba(201,162,39,0.6);
  font-size: 0.7rem;
  margin-top: 12px;
  letter-spacing: 0.5px;
}

/* Website tile */
.example-tile--website {
  padding: 0;
}

.example-website-preview {
  flex: 1;
  background: #f8fafc;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ewp-nav {
  height: 6px;
  background: var(--color-primary);
  border-radius: 2px;
  width: 100%;
}

.ewp-hero {
  height: 40px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border-radius: 4px;
  opacity: 0.7;
}

.ewp-cols {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 4px;
  flex: 1;
}

.ewp-cols > div {
  background: #e2e8f0;
  border-radius: 3px;
  min-height: 24px;
}

.ewp-cta {
  height: 8px;
  background: #10b981;
  border-radius: 2px;
  width: 50%;
  margin: 0 auto;
}

/* Business Plan tile */
.example-tile--plan {
  padding: 0;
}

.example-plan-doc {
  flex: 1;
  background: #fffef7;
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 3px solid var(--color-primary);
}

.example-plan-heading {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-text);
  margin-bottom: 6px;
}

.example-plan-line {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  padding: 2px 0;
  border-bottom: 1px dotted #e5e7eb;
}

/* Research tile */
.example-tile--research {
  padding: 0;
}

.example-research-doc {
  flex: 1;
  background: #f8fafc;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.example-research-icon {
  text-align: center;
  margin-bottom: 4px;
}

.example-research-cite {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  padding: 2px 4px;
  background: #f1f5f9;
  border-radius: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Image Batch tile */
.example-tile--images {
  padding: 0;
}

.example-images-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
  padding: 8px;
}

.example-img-placeholder {
  border-radius: 4px;
  min-height: 40px;
}

/* ---- Execution Log ---- */
.engine-log {
  border-top: 1px solid var(--color-border);
  background: var(--color-dark);
  color: var(--color-text-inverse);
  max-height: 260px;
  display: flex;
  flex-direction: column;
}

.engine-log-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}

.engine-log-header h3 {
  color: var(--color-text-inverse);
  margin: 0;
}

.engine-log-header .btn {
  color: var(--color-text-inverse);
  opacity: 0.7;
}

.engine-log-header .btn:hover {
  opacity: 1;
}

.engine-log-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.8;
  white-space: pre-wrap;
}

.engine-log-body::-webkit-scrollbar {
  width: 6px;
}

.engine-log-body::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: var(--radius-full);
}

.engine-log-body .log-info {
  color: #60A5FA;
}

.engine-log-body .log-success {
  color: #34D399;
}

.engine-log-body .log-warning {
  color: #FBBF24;
}

.engine-log-body .log-error {
  color: #F87171;
}


/* ==========================================================================
   20. Token / Balance Display (billing & dashboard pages)
   ========================================================================== */

.balance-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  border-radius: var(--radius-lg);
  border: 1px solid rgba(var(--color-primary-rgb), 0.15);
}

.balance-card-amount {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

.balance-card-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-medium);
}

.balance-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  flex-shrink: 0;
}

.token-cost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-section);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
}

.token-cost-value {
  color: var(--color-primary);
  font-weight: var(--font-bold);
}


/* ==========================================================================
   21. Loading States
   ========================================================================== */

/* ---- Skeleton ---- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-section) 25%,
    var(--color-border-light) 37%,
    var(--color-section) 63%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 14px;
  margin-bottom: var(--space-3);
  width: 100%;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-title {
  height: 24px;
  width: 50%;
  margin-bottom: var(--space-4);
}

.skeleton-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 200px;
}

/* ---- Spinner ---- */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-section);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

.spinner-white {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-text-inverse);
}

/* ---- Pulse ---- */
.pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ---- Loading Overlay ---- */
.loading-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: inherit;
  z-index: 10;
}


/* ==========================================================================
   22. Utility Classes
   ========================================================================== */

/* ---- Margin Top ---- */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* ---- Margin Bottom ---- */
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* ---- Margin Left / Right ---- */
.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ---- Padding ---- */
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }

/* ---- Text Alignment ---- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

/* ---- Display ---- */
.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }
.block { display: block; }
.inline-block { display: inline-block; }
.inline-flex { display: inline-flex; }

/* ---- Overflow & Text ---- */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.whitespace-nowrap { white-space: nowrap; }
.break-words { overflow-wrap: break-word; }

/* ---- Border Radius ---- */
.rounded { border-radius: var(--radius); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }
.rounded-none { border-radius: 0; }

/* ---- Shadows ---- */
.shadow-none { box-shadow: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* ---- Borders ---- */
.border { border: 1px solid var(--color-border); }
.border-top { border-top: 1px solid var(--color-border); }
.border-bottom { border-bottom: 1px solid var(--color-border); }
.border-left { border-left: 1px solid var(--color-border); }
.border-right { border-right: 1px solid var(--color-border); }
.border-none { border: none; }

/* ---- Sizing ---- */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* ---- Position ---- */
.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

/* ---- Cursor ---- */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

/* ---- Opacity ---- */
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-0 { opacity: 0; }

/* ---- Background ---- */
.bg-white { background-color: var(--color-card); }
.bg-section { background-color: var(--color-section); }
.bg-primary-light { background-color: var(--color-primary-light); }


/* ==========================================================================
   23. Animations
   ========================================================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ---- Animation Utility Classes ---- */
.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) ease-out;
}

.animate-slide-down {
  animation: slideDown var(--transition-slow) ease-out;
}

.animate-scale-in {
  animation: scaleIn var(--transition-slow) ease-out;
}

/* ---- Staggered Animations ---- */
.stagger-1 { animation-delay: 0.05s; animation-fill-mode: both; }
.stagger-2 { animation-delay: 0.1s; animation-fill-mode: both; }
.stagger-3 { animation-delay: 0.15s; animation-fill-mode: both; }
.stagger-4 { animation-delay: 0.2s; animation-fill-mode: both; }
.stagger-5 { animation-delay: 0.25s; animation-fill-mode: both; }
.stagger-6 { animation-delay: 0.3s; animation-fill-mode: both; }

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* ==========================================================================
   24. Responsive
   ========================================================================== */

/* ---- Tablet: 768px - 1023px ---- */
@media (max-width: 1023px) {
  :root {
    --sidebar-width: 320px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-row {
    gap: var(--space-10);
  }

  .footer-grid {
    grid-template-columns: 1fr repeat(2, 1fr) repeat(2, 1fr);
    gap: var(--space-6);
  }

  .footer-grid .footer-col--brand {
    grid-column: 1 / -1;
  }

  .footer-features-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

  .hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
  }

  .paper-tile-grid {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  }

  /* -- Engine tablet -- */
  .engine-main {
    margin-left: var(--sidebar-width);
  }

  .engine-prompt-bar {
    padding: var(--space-4);
  }

  .engine-main .paper-tile-grid {
    padding: var(--space-4);
  }

  .engine-create-tiles {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
}

/* ---- Mobile: max-width 767px ---- */
@media (max-width: 767px) {
  :root {
    --navbar-height: 56px;
  }

  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  /* -- Nav mobile -- */
  .nav-links,
  .navbar-links {
    display: none;
  }

  .navbar-hamburger {
    display: flex;
  }

  .navbar .token-balance .token-balance-amount {
    display: none;
  }

  /* -- Grids collapse -- */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  /* -- Hero mobile -- */
  .hero {
    padding: var(--space-16) 0 var(--space-12);
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: var(--text-base);
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta .btn {
    width: 100%;
  }

  /* -- Stats -- */
  .stats-row {
    flex-direction: column;
    gap: var(--space-6);
  }

  /* -- Footer mobile -- */
  .footer-features-inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }

  .footer-grid .footer-col--brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .footer-bottom-links {
    justify-content: center;
  }

  /* -- Paper tiles -- */
  .paper-tile-grid {
    grid-template-columns: 1fr;
  }

  /* -- Pipeline scroll -- */
  .pipeline {
    padding-bottom: var(--space-4);
  }

  /* -- Sidebar becomes bottom sheet -- */
  .sidebar {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    max-height: 60vh;
    border-right: none;
    border-top: 1px solid var(--color-border);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(calc(100% - 48px));
    transition: transform var(--transition-slow);
    z-index: var(--z-sidebar);
  }

  .sidebar.open {
    transform: translateY(0);
  }

  .sidebar-toggle {
    display: block;
  }

  .with-sidebar {
    margin-left: 0;
    padding-bottom: 56px;
  }

  /* -- Engine mobile -- */
  .engine-layout {
    flex-direction: column;
  }

  .engine-main {
    margin-left: 0;
    min-height: auto;
  }

  .engine-prompt-bar {
    position: relative;
    top: 0;
    padding: var(--space-4);
  }

  .engine-prompt-actions {
    flex-wrap: wrap;
    justify-content: center;
  }

  .engine-toolbar {
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
  }

  .engine-main .paper-tile-grid {
    padding: var(--space-4);
  }

  .engine-empty-state {
    min-height: 40vh;
    padding: var(--space-8) var(--space-4);
  }

  .engine-create-tiles {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }

  .paper-tile--create {
    min-height: 160px;
    padding: var(--space-4) var(--space-3);
  }

  .paper-tile-create-icon svg {
    width: 36px;
    height: 36px;
  }

  .engine-examples-tiles {
    grid-template-columns: repeat(3, 1fr);
  }

  .engine-examples-row {
    justify-content: center;
  }

  .empty-steps {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }

  .empty-step-connector {
    width: 2px;
    height: 16px;
    margin-left: 15px;
  }

  .empty-features {
    flex-direction: column;
    align-items: center;
  }

  .engine-log {
    max-height: 200px;
  }

  /* -- Tables horizontal scroll -- */
  .table-wrapper {
    margin-left: calc(var(--space-4) * -1);
    margin-right: calc(var(--space-4) * -1);
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  /* -- Modal fullscreen on mobile -- */
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }

  .modal {
    max-width: none;
    max-height: 90vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  }

  .modal-overlay.open .modal {
    transform: translateY(0);
  }

  /* -- Toast full width -- */
  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    bottom: var(--space-4);
  }

  .toast {
    min-width: auto;
    max-width: none;
    width: 100%;
  }

  /* -- Typography scaling -- */
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }

  /* -- Sections -- */
  .section {
    padding: var(--space-12) 0;
  }

  .section-lg {
    padding: var(--space-16) 0;
  }
}

/* ---- Wide: 1280px+ ---- */
@media (min-width: 1280px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }

  .paper-tile-grid {
    grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
  }
}

/* ---- Extra Wide: 1536px+ ---- */
@media (min-width: 1536px) {
  .feature-grid {
    gap: var(--space-10);
  }
}


/* ==========================================================================
   25. Print Styles
   ========================================================================== */

@media print {
  .navbar,
  .sidebar,
  .sidebar-toggle,
  .toast-container,
  .navbar-hamburger,
  .modal-overlay,
  .btn,
  .site-footer {
    display: none !important;
  }

  body {
    background: white;
    color: black;
    font-size: 12pt;
  }

  .page-content {
    padding-top: 0;
  }

  .with-sidebar {
    margin-left: 0;
  }

  .card,
  .paper-tile {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a[href]::after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: #666;
  }
}