/* ==========================================================================
   SyllaBuddy Design System
   Inspired by glasses.google — minimalist editorial tech, crisp pills,
   glassmorphic surfaces, hairline borders, and dual White/Blue + Black/Blue.
   ========================================================================== */

:root,
[data-theme="light"] {
  --bg-canvas: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-surface: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.82);
  --bg-tint: #eff6ff;
  --bg-tint-hover: #dbeafe;
  --border-hairline: #e2e8f0;
  --border-strong: #cbd5e1;

  --ink-primary: #0f172a;
  --ink-secondary: #475569;
  --ink-muted: #64748b;

  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-cyan: #0ea5e9;
  --accent-glow: rgba(37, 99, 235, 0.14);
  --accent-cyan-glow: rgba(14, 165, 233, 0.12);

  --status-success-bg: #ecfdf5;
  --status-success-ink: #047857;
  --status-success-border: #a7f3d0;

  --status-warn-bg: #fffbeb;
  --status-warn-ink: #b45309;
  --status-warn-border: #fde68a;

  --status-danger-bg: #fef2f2;
  --status-danger-ink: #b91c1c;
  --status-danger-border: #fecaca;

  --status-info-bg: #eff6ff;
  --status-info-ink: #1d4ed8;
  --status-info-border: #bfdbfe;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 30px -10px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 48px -18px rgba(37, 99, 235, 0.14);
  --color-scheme: light;
}

[data-theme="dark"] {
  --bg-canvas: #04070f;
  --bg-subtle: #0a101f;
  --bg-surface: rgba(15, 23, 42, 0.72);
  --bg-glass: rgba(10, 16, 31, 0.76);
  --bg-tint: rgba(59, 130, 246, 0.12);
  --bg-tint-hover: rgba(59, 130, 246, 0.2);
  --border-hairline: rgba(56, 189, 248, 0.16);
  --border-strong: rgba(56, 189, 248, 0.3);

  --ink-primary: #f8fafc;
  --ink-secondary: #94a3b8;
  --ink-muted: #64748b;

  --accent-primary: #3b82f6;
  --accent-primary-hover: #60a5fa;
  --accent-cyan: #38bdf8;
  --accent-glow: rgba(59, 130, 246, 0.22);
  --accent-cyan-glow: rgba(56, 189, 248, 0.16);

  --status-success-bg: rgba(16, 185, 129, 0.14);
  --status-success-ink: #6ee7b7;
  --status-success-border: rgba(16, 185, 129, 0.28);

  --status-warn-bg: rgba(245, 158, 11, 0.14);
  --status-warn-ink: #fcd34d;
  --status-warn-border: rgba(245, 158, 11, 0.28);

  --status-danger-bg: rgba(239, 68, 68, 0.14);
  --status-danger-ink: #fca5a5;
  --status-danger-border: rgba(239, 68, 68, 0.3);

  --status-info-bg: rgba(56, 189, 248, 0.12);
  --status-info-ink: #7dd3fc;
  --status-info-border: rgba(56, 189, 248, 0.26);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 12px 32px -10px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 28px 60px -18px rgba(56, 189, 248, 0.16);
  --color-scheme: dark;
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: var(--color-scheme);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-canvas);
  color: var(--ink-primary);
  font-family: "Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  transition: background-color 220ms ease, color 220ms ease;
  position: relative;
  overflow-x: hidden;
}

/* Subtle editorial ambient aura */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 520px;
  background:
    radial-gradient(ellipse 55% 60% at 25% 20%, var(--accent-glow), transparent 70%),
    radial-gradient(ellipse 45% 55% at 78% 15%, var(--accent-cyan-glow), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 150ms ease, opacity 150ms ease;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 820px;
}

.main-content {
  flex: 1;
  padding: 36px 0 72px;
}

/* Typography */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: 9999px;
  background: var(--bg-tint);
  border: 1px solid var(--border-hairline);
  color: var(--accent-primary);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.display-title {
  margin: 18px 0 16px;
  font-size: clamp(2.2rem, 5vw, 3.85rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
}

.gradient-text {
  background: linear-gradient(125deg, var(--accent-primary) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.page-title {
  margin: 0;
  font-size: clamp(1.55rem, 2.5vw, 2.05rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.page-subtitle {
  margin: 6px 0 0;
  color: var(--ink-secondary);
  font-size: 15px;
  max-width: 640px;
}

.muted {
  color: var(--ink-secondary);
}

.small {
  font-size: 13px;
}

/* Frosted Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-hairline);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-primary);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.brand:hover {
  color: var(--ink-primary);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.brand-badge {
  font-size: 10.5px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 9999px;
  background: var(--bg-tint);
  color: var(--accent-primary);
  border: 1px solid var(--border-hairline);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-link {
  padding: 7px 14px;
  border-radius: 9999px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink-secondary);
  transition: background-color 150ms ease, color 150ms ease;
}

.nav-link:hover {
  color: var(--ink-primary);
  background: var(--bg-tint);
}

.nav-link.active {
  color: var(--accent-primary);
  background: var(--bg-tint);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
}

/* Pill Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 9999px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  color: var(--ink-primary);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, background-color 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
  color: var(--ink-primary);
}

.btn:active {
  transform: scale(0.985);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 6px 20px -6px var(--accent-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-primary-hover), var(--accent-primary));
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 10px 24px -6px var(--accent-glow);
}

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

.btn-ghost:hover {
  background: var(--bg-tint);
  color: var(--ink-primary);
  border-color: transparent;
}

.btn-danger {
  background: var(--status-danger-bg);
  border-color: var(--status-danger-border);
  color: var(--status-danger-ink);
}

.btn-danger:hover {
  background: var(--status-danger-ink);
  border-color: var(--status-danger-ink);
  color: #ffffff;
}

.btn-lg {
  padding: 12px 26px;
  font-size: 15px;
}

.btn-sm {
  padding: 6px 13px;
  font-size: 12.5px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 9999px;
}

/* Glass Cards & Surfaces */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.card-title {
  margin: 0;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.015em;
}

/* Grids */
.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* Forms & Inputs */
.form-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-secondary);
}

.input,
.select {
  width: 100%;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-subtle);
  color: var(--ink-primary);
  font-size: 14px;
  transition: border-color 150ms ease, background-color 150ms ease, box-shadow 150ms ease;
}

[data-theme="dark"] .input,
[data-theme="dark"] .select {
  background: rgba(4, 7, 15, 0.65);
}

.input:focus,
.select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-sm {
  padding: 6px 10px;
  font-size: 13px;
  border-radius: 9px;
}

/* Pills & Badges */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid transparent;
}

.pill-success {
  background: var(--status-success-bg);
  color: var(--status-success-ink);
  border-color: var(--status-success-border);
}

.pill-warn {
  background: var(--status-warn-bg);
  color: var(--status-warn-ink);
  border-color: var(--status-warn-border);
}

.pill-danger {
  background: var(--status-danger-bg);
  color: var(--status-danger-ink);
  border-color: var(--status-danger-border);
}

.text-danger {
  color: var(--status-danger-ink);
}

.pill-info {
  background: var(--status-info-bg);
  color: var(--status-info-ink);
  border-color: var(--status-info-border);
}

.pill-neutral {
  background: var(--bg-subtle);
  color: var(--ink-secondary);
  border-color: var(--border-hairline);
}

/* Segmented Control */
.segmented {
  display: inline-flex;
  padding: 4px;
  border-radius: 9999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  gap: 4px;
}

.segmented-btn {
  padding: 7px 16px;
  border-radius: 9999px;
  border: none;
  background: transparent;
  color: var(--ink-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, box-shadow 150ms ease;
}

.segmented-btn.active {
  background: var(--bg-surface);
  color: var(--ink-primary);
  box-shadow: var(--shadow-sm);
}

/* Landing Hero & Bento */
.hero {
  padding: 56px 0 48px;
  text-align: center;
}

.hero-lead {
  margin: 0 auto 28px;
  max-width: 640px;
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  color: var(--ink-secondary);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-preview {
  margin-top: 48px;
  padding: 24px;
  border-radius: 26px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  text-align: left;
}

.preview-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-hairline);
}

.preview-dots {
  display: flex;
  gap: 6px;
}

.preview-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--border-strong);
}

.bento-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tint);
  color: var(--accent-primary);
  margin-bottom: 14px;
  border: 1px solid var(--border-hairline);
}

/* Auth Shell */
.auth-wrap {
  max-width: 440px;
  margin: 28px auto 0;
}

.divider-text {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-muted);
  font-size: 12.5px;
  margin: 18px 0;
}

.divider-text::before,
.divider-text::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-hairline);
}

.google-btn-slot {
  display: flex;
  justify-content: center;
  min-height: 44px;
  color-scheme: light;
}

.google-btn-slot iframe {
  color-scheme: light;
  background: transparent;
  clip-path: inset(2px round 999px);
}

/* Dropzone */
.dropzone {
  border: 1.5px dashed var(--border-strong);
  border-radius: 18px;
  padding: 28px 20px;
  text-align: center;
  background: var(--bg-subtle);
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent-primary);
  background: var(--bg-tint);
}

/* Syllabi Cards */
.syllabus-card {
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}

.syllabus-thumb {
  position: relative;
  height: 190px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-hairline);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.syllabus-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.syllabus-body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.syllabus-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: 6px;
}

/* Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table th,
.table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: middle;
}

.table th {
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

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

/* Alerts & Banners */
.alert {
  padding: 13px 16px;
  border-radius: 14px;
  border: 1px solid var(--border-hairline);
  font-size: 13.5px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-info {
  background: var(--status-info-bg);
  border-color: var(--status-info-border);
  color: var(--status-info-ink);
}

.alert-warn {
  background: var(--status-warn-bg);
  border-color: var(--status-warn-border);
  color: var(--status-warn-ink);
}

.alert-danger {
  background: var(--status-danger-bg);
  border-color: var(--status-danger-border);
  color: var(--status-danger-ink);
}

.alert-success {
  background: var(--status-success-bg);
  border-color: var(--status-success-border);
  color: var(--status-success-ink);
}

/* Stat Tile */
.stat-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-top: 8px;
}

/* Course / Preview Items */
.course-item {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-subtle);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.course-item-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

/* Legal Prose */
.prose h2 {
  margin: 28px 0 10px;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
}

.prose p,
.prose li {
  color: var(--ink-secondary);
}

.prose ul {
  padding-left: 20px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-hairline);
  padding: 28px 0 36px;
  background: var(--bg-subtle);
  font-size: 13px;
  color: var(--ink-secondary);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

/* Toast Notifications */
.toast-region {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 360px;
}

.toast {
  padding: 12px 16px;
  border-radius: 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
  font-size: 13.5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  animation: toast-in 180ms ease-out;
}

.toast-error {
  border-color: var(--status-danger-border);
  color: var(--status-danger-ink);
}

.toast-success {
  border-color: var(--status-success-border);
  color: var(--status-success-ink);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Utilities */
.flex {
  display: flex;
}

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

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

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

.gap-2 {
  gap: 8px;
}

.gap-3 {
  gap: 12px;
}

.gap-4 {
  gap: 16px;
}

.mt-2 {
  margin-top: 8px;
}

.mt-3 {
  margin-top: 12px;
}

.mt-4 {
  margin-top: 16px;
}

.mt-6 {
  margin-top: 24px;
}

.mb-4 {
  margin-bottom: 16px;
}

.hidden {
  display: none !important;
}

/* Responsive Breakpoints */
@media (max-width: 960px) {
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .nav-links {
    display: none;
    width: 100%;
    padding: 8px 0 14px;
    flex-direction: column;
    align-items: stretch;
  }
  .nav-links.open {
    display: flex;
  }
  .navbar-inner {
    flex-wrap: wrap;
  }
}