/* Legal AI Forum - Main Stylesheet */
/* Design System & Component Library */

/* ============================================
   DESIGN TOKENS (CSS Custom Properties)
   ============================================ */

:root {
  /* Core Colors */
  --ink: #0B1F3B;
  --royal: #2A7DE1;
  --teal: #0FA3A3;
  --slate-900: #0E1726;
  --slate-700: #334155;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
  --slate-50: #F8FAFC;
  --white: #FFFFFF;

  /* Vendor Colors */
  --amethyst: #6F3FF5;
  --lavender-50: #F4F1FF;

  /* Feedback Colors */
  --success: #119D57;
  --warning: #D97706;
  --error: #C0362C;
  --info: #2563EB;

  /* Spacing Unit */
  --u: 4px;

  /* Border Radius */
  --r-sm: 12px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-slow: 320ms ease-out;

  /* Max Content Width */
  --max-width: 1200px;
  --max-width-content: 1100px;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&family=IBM+Plex+Serif:wght@400;600&display=swap');

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 26px;
  color: var(--slate-700);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Scale */
.display {
  font-size: 44px;
  line-height: 52px;
  font-weight: 700;
  color: var(--ink);
}

h1, .h1 {
  font-size: 36px;
  line-height: 44px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: calc(var(--u) * 4);
}

h2, .h2 {
  font-size: 28px;
  line-height: 36px;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: calc(var(--u) * 3);
}

h3, .h3 {
  font-size: 22px;
  line-height: 30px;
  font-weight: 600;
  color: var(--slate-900);
  margin-bottom: calc(var(--u) * 2);
}

.body-l {
  font-size: 18px;
  line-height: 28px;
}

.body-m {
  font-size: 16px;
  line-height: 26px;
}

.caption, .meta {
  font-size: 14px;
  line-height: 20px;
}

/* Serif for quotes */
.quote, blockquote {
  font-family: 'IBM Plex Serif', Georgia, Times, serif;
  font-weight: 600;
  color: var(--ink);
  border-left: 4px solid var(--teal);
  padding-left: calc(var(--u) * 4);
  margin: calc(var(--u) * 4) 0;
}

/* Links */
a {
  color: var(--royal);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-fast);
}

a:hover, a:focus {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Overline utility */
.overline {
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 700;
  margin-bottom: calc(var(--u) * 2);
  display: inline-block;
}

/* Lists */
ul, ol {
  margin-left: calc(var(--u) * 5);
  margin-bottom: calc(var(--u) * 4);
}

li {
  margin-bottom: calc(var(--u) * 2);
}

/* ============================================
   LAYOUT & GRID
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 calc(var(--u) * 6);
}

.container-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 calc(var(--u) * 6);
}

.grid {
  display: grid;
  gap: calc(var(--u) * 6);
}

.grid-12 {
  grid-template-columns: repeat(12, 1fr);
  gap: calc(var(--u) * 5);
}

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

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

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: calc(var(--u) * 3) calc(var(--u) * 5);
  border-radius: var(--r-sm);
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: var(--transition-base);
  text-decoration: none;
}

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

.btn-primary {
  background-color: var(--royal);
  color: var(--white);
}

.btn-primary:hover {
  background-color: #1e6bc7;
  transform: translateY(1px);
}

.btn-primary:active {
  transform: translateY(1px);
  background-color: #1a5fb3;
}

.btn-secondary {
  background-color: var(--white);
  color: var(--royal);
  border: 2px solid var(--royal);
}

.btn-secondary:hover {
  background-color: var(--slate-50);
}

.btn-tertiary {
  background: none;
  color: var(--royal);
  padding: calc(var(--u) * 2) 0;
}

.btn-tertiary::after {
  content: ' →';
}

.btn-destructive {
  background-color: var(--error);
  color: var(--white);
}

/* ============================================
   BADGES & CHIPS
   ============================================ */

.badge {
  display: inline-block;
  padding: calc(var(--u) * 2) calc(var(--u) * 3);
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 600;
}

.badge-neutral {
  background-color: var(--slate-100);
  color: var(--slate-700);
}

.badge-sponsored {
  background-color: var(--amethyst);
  color: var(--white);
  border-radius: var(--r-pill);
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: var(--white);
  border-radius: var(--r-lg);
  padding: calc(var(--u) * 6) calc(var(--u) * 8);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

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

.card-header {
  display: flex;
  align-items: center;
  gap: calc(var(--u) * 3);
  margin-bottom: calc(var(--u) * 4);
}

.card-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* ============================================
   NAVIGATION
   ============================================ */

.header {
  background-color: var(--white);
  border-bottom: 1px solid var(--slate-100);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(var(--u) * 4) calc(var(--u) * 6);
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 3px solid rgba(42, 125, 225, 0.08);
}

.logo {
  display: flex;
  align-items: center;
  gap: calc(var(--u) * 3);
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 18px;
}

.logo img {
  height: 36px;
  width: auto;
}

.logo-text {
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  line-height: 1;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: calc(var(--u) * 6);
  margin: 0;
  align-items: center;
}

.nav-menu a {
  color: var(--slate-700);
  font-weight: 400;
  text-decoration: none;
  padding: calc(var(--u) * 2) 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--ink);
  border-bottom-color: var(--royal);
}

.lang-switcher {
  display: flex;
  gap: calc(var(--u) * 2);
  margin-left: calc(var(--u) * 4);
}

.lang-btn {
  background: none;
  border: 1px solid var(--slate-200);
  padding: calc(var(--u) * 2) calc(var(--u) * 3);
  border-radius: var(--r-sm);
  cursor: pointer;
  font-size: 14px;
  color: var(--slate-700);
  transition: var(--transition-fast);
}

.lang-btn:hover {
  background-color: var(--slate-50);
}

.lang-btn.active {
  background-color: var(--royal);
  color: var(--white);
  border-color: var(--royal);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: calc(var(--u) * 2);
  color: var(--slate-700);
}

/* ============================================
   DISCLOSURE RIBBON
   ============================================ */

.disclosure-ribbon {
  background-color: var(--slate-100);
  color: var(--slate-700);
  padding: calc(var(--u) * 2) calc(var(--u) * 6);
  font-size: 14px;
  text-align: center;
  border-bottom: 1px solid var(--slate-200);
  line-height: 20px;
}

.disclosure-ribbon a {
  color: var(--royal);
  font-weight: 600;
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: calc(var(--u) * 4);
}

.form-label {
  display: block;
  font-size: 14px;
  line-height: 20px;
  color: var(--slate-700);
  margin-bottom: calc(var(--u) * 2);
  font-weight: 600;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: calc(var(--u) * 3) calc(var(--u) * 4);
  border: 1px solid var(--slate-200);
  border-radius: var(--r-sm);
  font-size: 16px;
  font-family: inherit;
  color: var(--slate-900);
  background-color: var(--white);
  transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--royal);
  box-shadow: 0 0 0 3px rgba(42, 125, 225, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group {
  margin-top: calc(var(--u) * 4);
}

.checkbox-item {
  display: flex;
  align-items: flex-start;
  gap: calc(var(--u) * 2);
  margin-bottom: calc(var(--u) * 3);
}

.checkbox-item input[type="checkbox"] {
  margin-top: 2px;
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.checkbox-item label {
  font-size: 14px;
  line-height: 20px;
  color: var(--slate-700);
  cursor: pointer;
}

.checkbox-item label a {
  color: var(--royal);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.checkbox-item label a:hover {
  color: #1e6bc7;
}

/* Form submission states */
.form-message {
  margin-top: calc(var(--u) * 4);
  padding: calc(var(--u) * 4) calc(var(--u) * 5);
  border-radius: var(--r-sm);
  font-size: 14px;
  line-height: 20px;
  display: none;
}

.form-message.show {
  display: block;
}

.form-message.success {
  background-color: #D1FAE5;
  color: #065F46;
  border: 1px solid #10B981;
}

.form-message.error {
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid #EF4444;
}

.form-message.loading {
  background-color: #DBEAFE;
  color: #1E40AF;
  border: 1px solid #3B82F6;
  display: flex;
  align-items: center;
  gap: calc(var(--u) * 3);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn.loading {
  position: relative;
  color: transparent;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.6s linear infinite;
}

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

.form-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.6s linear infinite;
}

/* ============================================
   CALLOUTS
   ============================================ */

.callout {
  padding: calc(var(--u) * 4) calc(var(--u) * 5);
  border-left: 4px solid;
  border-radius: var(--r-sm);
  margin: calc(var(--u) * 4) 0;
  background-color: var(--slate-50);
}

.callout-info {
  border-left-color: var(--info);
}

.callout-warning {
  border-left-color: var(--warning);
}

.callout-error {
  border-left-color: var(--error);
}

/* ============================================
   VENDOR-LABELED PANELS
   ============================================ */

.vendor-panel {
  background-color: var(--lavender-50);
  border-left: 16px solid var(--amethyst);
  padding: calc(var(--u) * 5) calc(var(--u) * 6);
  border-radius: var(--r-sm);
  margin: calc(var(--u) * 6) 0;
}

.vendor-panel h3 {
  color: var(--amethyst);
  margin-bottom: calc(var(--u) * 3);
}

.vendor-panel p {
  color: var(--slate-700);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background-color: var(--slate-50);
  border-top: 1px solid var(--slate-200);
  padding: calc(var(--u) * 8) calc(var(--u) * 6);
  margin-top: calc(var(--u) * 16);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: calc(var(--u) * 4);
  margin: calc(var(--u) * 4) 0;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--slate-700);
  font-weight: 400;
}

.footer-copyright {
  font-size: 14px;
  color: var(--slate-700);
  margin-top: calc(var(--u) * 4);
}

/* ============================================
   TABLES
   ============================================ */

.table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--u) * 4) 0;
}

.table th {
  background-color: var(--slate-100);
  color: var(--slate-700);
  padding: calc(var(--u) * 3) calc(var(--u) * 4);
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.table td {
  padding: calc(var(--u) * 3) calc(var(--u) * 4);
  border-bottom: 1px solid var(--slate-100);
}

.table tbody tr:nth-child(even) {
  background-color: var(--slate-50);
}

.table a {
  color: var(--royal);
}

/* ============================================
   UTILITIES
   ============================================ */

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

.text-left {
  text-align: left;
}

.mt-1 { margin-top: calc(var(--u) * 1); }
.mt-2 { margin-top: calc(var(--u) * 2); }
.mt-3 { margin-top: calc(var(--u) * 3); }
.mt-4 { margin-top: calc(var(--u) * 4); }
.mt-6 { margin-top: calc(var(--u) * 6); }
.mt-8 { margin-top: calc(var(--u) * 8); }

.mb-1 { margin-bottom: calc(var(--u) * 1); }
.mb-2 { margin-bottom: calc(var(--u) * 2); }
.mb-3 { margin-bottom: calc(var(--u) * 3); }
.mb-4 { margin-bottom: calc(var(--u) * 4); }
.mb-6 { margin-bottom: calc(var(--u) * 6); }
.mb-8 { margin-bottom: calc(var(--u) * 8); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   QUOTES / TESTIMONIALS
   ============================================ */
.quote-block {
  background-color: var(--white);
  border: 1px solid var(--slate-100);
  border-radius: var(--r-lg);
  padding: calc(var(--u) * 6);
  box-shadow: var(--shadow-sm);
}
.quote-text {
  font-family: 'IBM Plex Serif', Georgia, Times, serif;
  font-size: 20px;
  line-height: 30px;
  color: var(--ink);
}
.quote-meta {
  margin-top: calc(var(--u) * 3);
  color: var(--slate-700);
  font-size: 14px;
}

/* ============================================
   STAT CHIPS / BADGES
   ============================================ */
.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--r-pill);
  background-color: var(--slate-50);
  border: 1px solid var(--slate-200);
  font-weight: 600;
  color: var(--slate-900);
  font-size: 14px;
}
.badge-neutral-outline {
  border: 1px solid var(--slate-200);
  color: var(--slate-700);
  background: transparent;
  border-radius: var(--r-pill);
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
}

/* ============================================
   GRID HELPERS
   ============================================ */
.grid-auto-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: calc(var(--u) * 6);
}
.grid-auto-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: calc(var(--u) * 6);
}

/* ============================================
   STICKY / FLOATING CTA
   ============================================ */
.sticky-cta {
  position: sticky;
  top: calc(var(--u) * 8);
}
.floating-cta {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 16px;
  z-index: 90;
  padding: 0 calc(var(--u) * 4);
}
.floating-cta .btn {
  width: 100%;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-auto-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .display {
    font-size: 36px;
    line-height: 44px;
  }

  h1, .h1 {
    font-size: 28px;
    line-height: 36px;
  }

  h2, .h2 {
    font-size: 22px;
    line-height: 30px;
  }

  h3, .h3 {
    font-size: 18px;
    line-height: 26px;
  }

  .container,
  .container-content {
    padding: 0 calc(var(--u) * 4);
  }

  .nav {
    padding: calc(var(--u) * 3) calc(var(--u) * 4);
  }

  .mobile-menu-toggle {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    flex-direction: column;
    padding: calc(var(--u) * 4);
    border-top: 1px solid var(--slate-100);
    box-shadow: var(--shadow-md);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: calc(var(--u) * 3);
    width: 100%;
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .grid-12 {
    grid-template-columns: 1fr;
    gap: calc(var(--u) * 4);
  }

  .lang-switcher {
    margin-left: 0;
  }

  .floating-cta {
    display: block;
  }
}

/* ============================================
   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;
  }
}