/* StudyVerse AI — design tokens & component classes
   Colors captured from the original Lovable build (oklch light theme). */

:root {
  --radius: 1rem;

  --background: oklch(98.5% .005 240);
  --foreground: oklch(26% .045 258);

  --card: oklch(100% 0 0);
  --card-foreground: oklch(26% .045 258);

  --primary: oklch(58.5% .13 253);
  --primary-foreground: oklch(99% .004 240);
  --primary-soft: oklch(95.2% .023 250);

  --secondary: oklch(96.5% .012 245);
  --secondary-foreground: oklch(33% .045 258);

  --muted: oklch(96.8% .008 245);
  --muted-foreground: oklch(56% .028 252);

  --accent: oklch(95.5% .02 250);
  --accent-foreground: oklch(33% .045 258);

  --destructive: oklch(60% .18 25);
  --destructive-foreground: oklch(99% .004 240);

  --border: oklch(92.5% .012 248);

  --teal: oklch(60.5% .078 196);
  --teal-soft: oklch(95.5% .022 196);

  --sage: oklch(61.5% .078 152);
  --sage-soft: oklch(95.5% .028 152);

  --lavender: oklch(62% .095 295);
  --lavender-soft: oklch(95.8% .022 295);

  --amber: oklch(70% .12 65);
  --amber-soft: oklch(96.2% .032 75);

  --shadow-soft: 0 1px 2px oklch(26% .045 258 / .04), 0 8px 24px -12px oklch(26% .045 258 / .1);

  --sidebar: oklch(99.5% .003 240);
  --sidebar-foreground: oklch(26% .045 258);
  --sidebar-accent: oklch(95.2% .023 250);
  --sidebar-accent-foreground: oklch(40% .1 253);
  --sidebar-border: oklch(93% .012 248);
}

* { box-sizing: border-box; }
html, body { padding: 0; margin: 0; }
body {
  background: var(--background);
  color: var(--foreground);
  font-family: 'Manrope', ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }
img { display: block; }

/* ---------- Solid color utilities ---------- */
.bg-background { background-color: var(--background); }
.bg-card { background-color: var(--card); }
.bg-primary { background-color: var(--primary); }
.bg-primary-soft { background-color: var(--primary-soft); }
.bg-secondary { background-color: var(--secondary); }
.bg-muted { background-color: var(--muted); }
.bg-accent { background-color: var(--accent); }
.bg-teal { background-color: var(--teal); }
.bg-teal-soft { background-color: var(--teal-soft); }
.bg-sage { background-color: var(--sage); }
.bg-sage-soft { background-color: var(--sage-soft); }
.bg-lavender { background-color: var(--lavender); }
.bg-lavender-soft { background-color: var(--lavender-soft); }
.bg-amber { background-color: var(--amber); }
.bg-amber-soft { background-color: var(--amber-soft); }
.bg-destructive { background-color: var(--destructive); }
.bg-sidebar { background-color: var(--sidebar); }
.bg-sidebar-accent { background-color: var(--sidebar-accent); }

.text-foreground { color: var(--foreground); }
.text-muted-foreground { color: var(--muted-foreground); }
.text-primary { color: var(--primary); }
.text-primary-foreground { color: var(--primary-foreground); }
.text-secondary-foreground { color: var(--secondary-foreground); }
.text-teal { color: var(--teal); }
.text-sage { color: var(--sage); }
.text-lavender { color: var(--lavender); }
.text-amber { color: var(--amber); }
.text-destructive { color: var(--destructive); }
.text-sidebar-accent-foreground { color: var(--sidebar-accent-foreground); }
.text-card-foreground { color: var(--card-foreground); }

.border-border { border-color: var(--border); }
.border-sidebar-border { border-color: var(--sidebar-border); }
.border-primary { border-color: var(--primary); }
.border-teal { border-color: var(--teal); }
.border-sage { border-color: var(--sage); }

/* ---------- Opacity-mixed variants (named, since CSS classes can't hold "/") ---------- */
.bg-primary-12 { background-color: color-mix(in oklch, var(--primary) 12%, transparent); }
.bg-primary-90 { background-color: color-mix(in oklch, var(--primary) 90%, transparent); }
.bg-primary-soft-50 { background-color: color-mix(in oklch, var(--primary-soft) 50%, transparent); }
.bg-secondary-50 { background-color: color-mix(in oklch, var(--secondary) 50%, transparent); }
.bg-secondary-60 { background-color: color-mix(in oklch, var(--secondary) 60%, transparent); }
.bg-secondary-70 { background-color: color-mix(in oklch, var(--secondary) 70%, transparent); }
.bg-card-95 { background-color: color-mix(in oklch, var(--card) 95%, transparent); }
.bg-teal-60 { background-color: color-mix(in oklch, var(--teal) 60%, transparent); }
.bg-teal-soft-70 { background-color: color-mix(in oklch, var(--teal-soft) 70%, transparent); }
.bg-sage-60 { background-color: color-mix(in oklch, var(--sage) 60%, transparent); }
.bg-lavender-12 { background-color: color-mix(in oklch, var(--lavender) 12%, transparent); }
.bg-muted-foreground-35 { background-color: color-mix(in oklch, var(--muted-foreground) 35%, transparent); }
.border-primary-45 { border-color: color-mix(in oklch, var(--primary) 45%, transparent); }
.border-teal-30 { border-color: color-mix(in oklch, var(--teal) 30%, transparent); }
.border-lavender-30 { border-color: color-mix(in oklch, var(--lavender) 30%, transparent); }
.text-muted-40 { color: color-mix(in oklch, var(--muted-foreground) 40%, transparent); }
.hover\:bg-primary-90:hover { background-color: color-mix(in oklch, var(--primary) 90%, transparent); }
.hover\:bg-secondary-60:hover { background-color: color-mix(in oklch, var(--secondary) 60%, transparent); }
.hover\:bg-secondary:hover { background-color: var(--secondary); }
.hover\:bg-teal-soft-70:hover { background-color: color-mix(in oklch, var(--teal-soft) 70%, transparent); }
.hover\:text-foreground:hover { color: var(--foreground); }

/* ---------- Shared components ---------- */
.surface {
  background-color: var(--card);
  border: 0.8px solid var(--border);
  border-radius: 1.5rem;
  box-shadow: var(--shadow-soft);
}
.shadow-soft { box-shadow: var(--shadow-soft); }

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 9999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.progress-track {
  height: 0.5rem;
  width: 100%;
  overflow: hidden;
  border-radius: 9999px;
  background-color: var(--secondary);
}
.progress-fill {
  height: 100%;
  border-radius: 9999px;
  background-color: var(--primary);
  transition: width .3s ease;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 0.75rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all .15s ease;
  border: none;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background-color: var(--primary); color: var(--primary-foreground); box-shadow: var(--shadow-soft); }
.btn-primary:hover { background-color: color-mix(in oklch, var(--primary) 90%, transparent); }
.btn-outline { background-color: var(--card); color: var(--foreground); border: 1px solid var(--border); }
.btn-outline:hover { background-color: var(--secondary); }
.btn-sm { padding: 0.625rem 1rem; font-size: 0.8125rem; }

/* ---------- App shell ---------- */
.app-sidebar {
  position: fixed;
  inset-block: 0;
  left: 0;
  width: 260px;
  display: none;
  flex-direction: column;
  border-right: 1px solid var(--sidebar-border);
  background-color: var(--sidebar);
  z-index: 30;
}
@media (min-width: 1024px) { .app-sidebar { display: flex; } }

.app-content { }
@media (min-width: 1024px) { .app-content { padding-left: 260px; } }

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-radius: 0.75rem;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  transition: background-color .15s, color .15s;
}
.nav-link:hover { background-color: var(--secondary); color: var(--foreground); }
.nav-link.active {
  background-color: var(--sidebar-accent);
  color: var(--sidebar-accent-foreground);
  font-weight: 600;
}
.nav-link.active svg { color: var(--primary); }

.mobile-bottom-nav {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  z-index: 40;
  display: flex;
  justify-content: space-around;
  border-top: 1px solid var(--border);
  background-color: color-mix(in oklch, var(--card) 95%, transparent);
  backdrop-filter: blur(8px);
  padding: 0.5rem;
}
@media (min-width: 1024px) { .mobile-bottom-nav { display: none; } }

.mobile-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background-color: var(--card);
  padding: 0.875rem 1.25rem;
}
@media (min-width: 1024px) { .mobile-topbar { display: none; } }

.icon-tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
}

/* Icon sizing to mirror lucide "size-*" utilities */
.i-3 { width: 0.75rem; height: 0.75rem; }
.i-3-5 { width: 0.875rem; height: 0.875rem; }
.i-4 { width: 1rem; height: 1rem; }
.i-4-5 { width: 1.125rem; height: 1.125rem; }
.i-5 { width: 1.25rem; height: 1.25rem; }

.container-page {
  margin-inline: auto;
  width: 100%;
  max-width: 1180px;
  padding-inline: 1.25rem;
  padding-block: 1.75rem 7rem;
}
@media (min-width: 640px) { .container-page { padding-inline: 2rem; } }
@media (min-width: 1024px) { .container-page { padding-block: 2.25rem 4rem; } }

.section-heading h2 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; color: var(--foreground); }
.section-heading p { margin-top: 0.25rem; font-size: 0.875rem; color: var(--muted-foreground); }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 9999px; }

/* ==========================================================================
   Layout / spacing / typography utilities
   (hand-written replacement for the Tailwind subset used across the pages —
   keeps the site fully self-contained with no CDN build step at runtime)
   ========================================================================== */
.flex { display: flex; }
.grid { display: grid; }
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { inset: 0; }
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }
.min-h-screen { min-height: 100vh; }
.w-full { width: 100%; }
.h-auto { height: auto; }

.flex-1 { flex: 1 1 0%; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-baseline { align-items: baseline; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.shrink-0 { flex-shrink: 0; }

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

.grid-split-narrow { grid-template-columns: 1fr; }
.grid-split-wide { grid-template-columns: 1fr; }
.grid-split-even { grid-template-columns: 1fr; }

.gap-2 { gap: 0.5rem; }
.gap-2\.5 { gap: 0.625rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-5 { gap: 1.25rem; }
.gap-6 { gap: 1.5rem; }

.mt-0\.5 { margin-top: 0.125rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-1\.5 { margin-top: 0.375rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-5 { margin-top: 1.25rem; }
.mt-6 { margin-top: 1.5rem; }
.mb-1\.5 { margin-bottom: 0.375rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-5 { margin-bottom: 1.25rem; }

.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.p-10 { padding: 2.5rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.py-3\.5 { padding-top: 0.875rem; padding-bottom: 0.875rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }

.rounded-xl { border-radius: 0.75rem; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.leading-relaxed { line-height: 1.625; }
.tracking-tight { letter-spacing: -0.015em; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }

@media (min-width: 640px) {
  .sm\:flex-row { flex-direction: row; }
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .sm\:p-8 { padding: 2rem; }
  .sm\:text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
}
@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:items-center { align-items: center; }
  .grid-split-narrow { grid-template-columns: 1fr 320px; }
  .grid-split-wide { grid-template-columns: 1.3fr 1fr; }
  .grid-split-even { grid-template-columns: 1.2fr 1fr; }
}
@media (min-width: 1280px) {
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}