/* ============================================================
   Expert Tutorials — theme.css
   Hand-written brand layer. Loaded AFTER compiled tailwind.css.
   Palette: Warm Ivory / Luxury Navy / Champagne Gold / Taupe.
   Reference design = visual source of truth (re-skinned).
   ============================================================ */

/* ---------- Self-hosted fonts (no CDN) ---------- */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 700;          /* variable file covers 400–700 */
  font-display: swap;
  src: url("../fonts/inter-latin-var.woff2") format("woff2");
}
@font-face {
  font-family: "Caveat";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("../fonts/caveat-latin-var.woff2") format("woff2");
}

/* ---------- Base ---------- */
:root {
  /* ----------------------------------------------------------------
     Blue / Amber EdTech palette (site-wide). The legacy luxury token
     NAMES are kept (navy/gold/ivory/champagne/taupe/ink/body) so the
     thousands of existing utility classes (bg-navy, text-gold, …) and
     CSS var() references re-skin to the new scheme without renaming.
     Old luxury value is noted in the comment after each token.
     ---------------------------------------------------------------- */
  --ivory: #ffffff;         /* was warm ivory  — page / light section bg */
  --ivory-soft: #f8fafc;    /* was soft ivory  — alt light section (slate-50) */
  --champagne: #e2e8f0;     /* was champagne   — borders / tinted bg (slate-200) */
  --navy: #0f172a;          /* was luxury navy — dark sections / headings (slate-900) */
  --navy-deep: #020617;     /* was deep navy   — footer (slate-950) */
  --navy-hover: #1e293b;    /* was navy hover  — dark hover (slate-800) */
  --gold: #f59e0b;          /* was gold        — accent (amber-500) */
  --gold-hover: #fbbf24;    /* was rich gold   — accent hover (amber-400) */
  --taupe: #94a3b8;         /* was taupe stone — muted/meta text (slate-400) */
  --taupe-soft: #cbd5e1;    /* was soft taupe  — subtle dividers (slate-300) */
  --ink: #0f172a;           /* was near-black  — headings (slate-900) */
  --body: #334155;          /* was body text   — paragraphs (slate-700) */

  /* Core blue/amber/slate scale (the identity colors) */
  --blue: #1d4ed8;          /* royal/cobalt — primary buttons, links, eyebrows */
  --blue-hover: #1e40af;
  --blue-50: #eff6ff;
  --amber: #f59e0b;         /* accent — demo CTAs, underlines, icons, bullets */
  --amber-hover: #d97706;
  --slate-900: #0f172a;     /* headings */
  --slate-700: #334155;
  --slate-600: #475569;     /* body text */
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  background-color: var(--ivory);
  color: var(--ink);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.font-hand {
  font-family: "Caveat", cursive;
}

/* Section eyebrow */
.eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--blue);
}

/* ---------- Buttons (pill, reference style) ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.95rem 2rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  line-height: 1;
}
.btn-primary {
  background-color: var(--blue);
  color: #fff;
  border: 1px solid var(--blue);
}
.btn-primary:hover {
  background-color: var(--blue-hover);
  border-color: var(--blue-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(29, 78, 216, 0.28);
}
.btn-gold {
  background-color: var(--amber);
  color: #1f2937;
  border: 1px solid var(--amber);
}
.btn-gold:hover {
  background-color: var(--amber-hover);
  border-color: var(--amber-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(245, 158, 11, 0.32);
}
.btn-outline {
  background-color: transparent;
  color: var(--ink);
  border: 1px solid var(--slate-300);
}
.btn-outline:hover {
  background-color: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
/* Outline on dark backgrounds */
.btn-outline-light {
  background-color: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
}
.btn-outline-light:hover {
  background-color: #fff;
  border-color: #fff;
  color: var(--slate-900);
}

/* ---------- Cards (neumorphic "metallic" — reference) ---------- */
.metallic-card {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px -12px rgba(15, 23, 42, 0.12);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.4s ease;
}
.metallic-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px -16px rgba(29, 78, 216, 0.25);
  border-color: rgba(29, 78, 216, 0.35);
}

/* ---------- Form inputs (reference underline style) ---------- */
.custom-input {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--taupe);
  border-radius: 0;
  padding: 0.6rem 0;
  width: 100%;
  color: var(--ink);
  transition: all 0.3s ease;
}
.custom-input:focus {
  outline: none;
  border-bottom-color: var(--blue);
  box-shadow: 0 1px 0 0 var(--blue);
}
.custom-input::placeholder {
  color: var(--taupe);
}

/* ---------- Labeled image placeholders (NO real images yet) ----------
   Usage: <div class="ph rounded-2xl" style="min-height:..."><span class="ph-label">Classroom teaching session</span></div>
   ph-dark variant for placement on navy sections. */
.ph {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  text-align: center;
  padding: 1.5rem;
  background-color: var(--slate-100);
  background-image: linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.5) 0%,
      rgba(203, 213, 225, 0.35) 100%
    );
  border: 1.5px dashed rgba(148, 163, 184, 0.7);
  color: #64748b;
  overflow: hidden;
}
.ph::before {
  content: "";
  width: 40px;
  height: 40px;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  opacity: 0.6;
  /* image / photo glyph */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='18' rx='2'/%3E%3Ccircle cx='8.5' cy='8.5' r='1.6'/%3E%3Cpath d='M21 15l-5-5L5 21'/%3E%3C/svg%3E");
}
.ph-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  max-width: 22ch;
  line-height: 1.5;
}
.ph-sub {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(111, 101, 85, 0.7);
}
/* placeholder on dark sections */
.ph-dark {
  background-color: rgba(255, 255, 255, 0.04);
  background-image: none;
  border-color: rgba(245, 158, 11, 0.35);
  color: rgba(255, 255, 255, 0.75);
}
.ph-dark::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f59e0b' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='18' rx='2'/%3E%3Ccircle cx='8.5' cy='8.5' r='1.6'/%3E%3Cpath d='M21 15l-5-5L5 21'/%3E%3C/svg%3E");
  opacity: 0.8;
}
.ph-sub-dark {
  color: rgba(245, 158, 11, 0.7);
}

/* Brand monogram (logo stand-in — not an image) */
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 9999px;
  background: var(--blue);
  color: var(--amber);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

/* ---------- Scroll reveal ----------
   The hidden state is scoped under `.js` (set on <html> by an inline
   head snippet before paint). With JavaScript disabled the class is
   never added, so `.reveal` content stays fully visible — graceful
   no-JS degradation with no flash for JS users. */
.js .reveal {
  opacity: 0;
  transform: translateY(38px);
  transition: opacity 0.9s cubic-bezier(0.5, 0, 0, 1),
    transform 0.9s cubic-bezier(0.5, 0, 0, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal.d1 { transition-delay: 0.12s; }
.reveal.d2 { transition-delay: 0.24s; }
.reveal.d3 { transition-delay: 0.36s; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Marquee (testimonials / news ticker) ---------- */
.marquee {
  overflow: hidden;
  white-space: nowrap;
  width: 100%;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track {
  display: inline-flex;
  animation: marquee 42s linear infinite;
}
.marquee:hover .marquee-track {
  animation-play-state: paused;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* News ticker */
.ticker {
  overflow: hidden;
  white-space: nowrap;
  flex: 1;
}
.ticker-track {
  display: inline-block;
  animation: ticker 22s linear infinite;
}
@keyframes ticker {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---------- Header / nav ---------- */
.site-header {
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
.nav-link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: #334155;                 /* slate-700 on light header */
  transition: color 0.25s ease;
}
.nav-link:hover {
  color: var(--blue);
}
/* Active page link: blue + amber-ish underline */
.nav-link.active {
  color: var(--blue);
}
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.55rem;
  height: 2px;
  border-radius: 2px;
  background: var(--blue);
}
/* Desktop dropdown */
.has-dropdown > .dropdown {
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s ease;
  pointer-events: none;
}
.has-dropdown:hover > .dropdown,
.has-dropdown:focus-within > .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

/* Mobile menu collapse */
.mobile-collapse {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.mobile-collapse.open {
  max-height: 720px;
}
.mobile-sub {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.mobile-sub.open {
  max-height: 360px;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--ivory); }
::-webkit-scrollbar-thumb { background: var(--taupe); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--gold); }

::selection { background: var(--gold); color: var(--ivory); }

/* Map tint to match palette */
.map-frame iframe {
  filter: grayscale(35%) contrast(1.05);
}

/* ---------- Inner-page shared helpers ---------- */
/* Breadcrumb (used in the dark inner-page hero band) */
.breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s ease;
}
.breadcrumb a:hover {
  color: var(--gold);
}
.breadcrumb [aria-current="page"] {
  color: var(--gold);
}

/* Long-form readable text (about story, syllabus intros, etc.) */
.prose-et {
  color: var(--body);
}
.prose-et > * + * {
  margin-top: 1.15rem;
}
.prose-et p {
  line-height: 1.85;
}
.prose-et h2 {
  color: var(--ink);
  font-weight: 300;
  letter-spacing: -0.01em;
}
.prose-et h3 {
  color: var(--ink);
  font-weight: 500;
  margin-top: 1.75rem;
}
.prose-et strong {
  color: var(--ink);
  font-weight: 600;
}
.prose-et ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.prose-et ul li {
  position: relative;
  padding-left: 1.5rem;
}
.prose-et ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 9999px;
  background: var(--gold);
}

/* Subject / topic pill */
.tag-pill {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  background: rgba(29, 78, 216, 0.06);
  border: 1px solid var(--slate-200);
  color: var(--body);
}

/* ============================================================
   BLUE / AMBER HOMEPAGE HERO SCHEME
   Self-contained layer for the redesigned header + hero + stats.
   Uses --blue / --amber tokens; rest of the site keeps navy/gold.
   ============================================================ */

/* ---- Pill buttons (sentence-case, not the uppercase .btn) ---- */
.btn-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.85rem 1.6rem;
  transition: background-color 0.25s ease, color 0.25s ease,
    box-shadow 0.25s ease, transform 0.25s ease;
  cursor: pointer;
}
.btn-blue {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 8px 20px -6px rgba(29, 78, 216, 0.45);
}
.btn-blue:hover {
  background: var(--blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -6px rgba(29, 78, 216, 0.5);
}
.btn-amber {
  background: var(--amber);
  color: #1f2937;            /* dark text on amber */
  box-shadow: 0 8px 20px -6px rgba(245, 158, 11, 0.5);
}
.btn-amber:hover {
  background: var(--amber-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -6px rgba(245, 158, 11, 0.55);
}
.btn-ghost {
  background: #fff;
  color: var(--blue);
  border: 1.5px solid var(--slate-200);
}
.btn-ghost:hover {
  border-color: var(--blue);
  background: var(--blue-50);
}

/* ---- Header logo badge (blue circle + amber cap) ---- */
.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  background: var(--blue);
  color: var(--amber);
  flex-shrink: 0;
  box-shadow: 0 6px 16px -6px rgba(29, 78, 216, 0.6);
}

/* ---- Light dropdown panel (overrides navy dropdown look) ---- */
.dropdown.dropdown-light {
  background: #fff;
  border: 1px solid var(--slate-200);
  box-shadow: 0 18px 40px -12px rgba(15, 23, 42, 0.22);
}

/* ---- Feature chip (tinted icon + label) ---- */
.feature-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--slate-600);
}
.chip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 9999px;
  flex-shrink: 0;
}

/* ---- Hand-drawn amber underline under "Dwarka" / "Free" ---- */
.hand-underline {
  position: relative;
  white-space: nowrap;
}
.hand-underline > svg {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.45em;
  width: 100%;
  height: 0.4em;
  overflow: visible;
  pointer-events: none;
}

/* ---- Lead form fields (white, icon-left, blue focus) ---- */
.et-field-wrap {
  position: relative;
}
.et-field-wrap > .et-field-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--slate-400);
  pointer-events: none;
}
.et-field {
  width: 100%;
  background: #fff;
  border: 1.5px solid var(--slate-200);
  border-radius: 0.7rem;
  padding: 0.7rem 0.9rem 0.7rem 2.5rem;
  font-size: 0.9rem;
  color: var(--slate-900);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.et-field::placeholder { color: var(--slate-400); }
.et-field:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
}
select.et-field {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.9rem center;
  background-size: 1.1rem;
  padding-right: 2.4rem;
}

/* ---- Stat divider (thin vertical lines between stats) ---- */
.stat-divide { border-color: var(--slate-200); }