/* ============================================================================
   HOUSE OF ASPIRANTS - QUIZ PORTAL
   style.css  |  Design system, layout & reusable components
   Mobile-first. Light + Dark theme via CSS custom properties.
   ========================================================================== */

/* ---------------------------------------------------------------- 1. TOKENS */
:root {
  /* Brand palette */
  --brand: #4f46e5;
  --brand-2: #6366f1;
  --brand-3: #f97316;
  --brand-grad: linear-gradient(135deg, #6366f1 0%, #4f46e5 55%, #f97316 160%);

  /* Semantic colours */
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #f59e0b;
  --info: #0ea5e9;

  /* Theme-dependent (light) */
  --bg: #f6f7fb;
  --bg-2: #eef1f8;
  --surface: #ffffff;
  --surface-2: #f9fafc;
  --text: #0f172a;
  --text-2: #475569;
  --muted: #7c879b;
  --border: #e6e9f2;
  --shadow: 0 10px 30px -12px rgba(15, 23, 42, 0.18);
  --shadow-lg: 0 24px 60px -24px rgba(15, 23, 42, 0.28);
  --ring: rgba(79, 70, 229, 0.35);
  --header-bg: rgba(255, 255, 255, 0.82);

  /* Shape / rhythm */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 30px;
  --container: 1200px;
  --header-h: 66px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="dark"] {
  --bg: #0b1020;
  --bg-2: #0f1730;
  --surface: #131a2e;
  --surface-2: #18203a;
  --text: #e8ecff;
  --text-2: #b4beda;
  --muted: #8b97b5;
  --border: #243050;
  --shadow: 0 12px 34px -14px rgba(0, 0, 0, 0.65);
  --shadow-lg: 0 30px 70px -26px rgba(0, 0, 0, 0.75);
  --ring: rgba(129, 140, 248, 0.45);
  --header-bg: rgba(11, 16, 32, 0.82);
}

/* ----------------------------------------------------------------- 2. RESET */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }
ul, ol { list-style: none; padding: 0; }

h1, h2, h3, h4 { line-height: 1.22; font-weight: 800; letter-spacing: -0.02em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.35rem); }

:focus-visible {
  outline: 3px solid var(--brand-2);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection { background: var(--brand); color: #fff; }

/* ------------------------------------------------------------ 3. UTILITIES */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 18px;
}

.section { padding: clamp(46px, 7vw, 84px) 0; }
.section-alt { background: var(--bg-2); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}
.section-head p { color: var(--muted); margin-top: 6px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 10px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  border-radius: 3px;
  background: var(--brand-grad);
}

.muted { color: var(--muted); }
.text-sm { font-size: 0.875rem; }
.center { text-align: center; }
.hidden { display: none !important; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 26px; }

.grid { display: grid; gap: 18px; }
.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)); }

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

.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 200;
  background: var(--brand); color: #fff; padding: 10px 16px;
  border-radius: 0 0 10px 10px; transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* --------------------------------------------------------------- 4. BUTTONS */
.btn {
  --btn-bg: var(--surface);
  --btn-fg: var(--text);
  --btn-bd: var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1.5px solid var(--btn-bd);
  transition: transform 0.18s var(--ease), box-shadow 0.25s var(--ease),
    background 0.2s, border-color 0.2s, opacity 0.2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }
.btn:disabled, .btn[disabled] { opacity: 0.5; pointer-events: none; }

.btn-primary {
  background: var(--brand-grad);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 12px 26px -14px rgba(79, 70, 229, 0.9);
}
.btn-ghost { background: transparent; }
.btn-soft { background: color-mix(in srgb, var(--brand) 12%, transparent); color: var(--brand); border-color: transparent; }
.btn-telegram { background: #229ed9; color: #fff; border-color: transparent; }
.btn-telegram:hover { background: #1b8dc4; }
.btn-danger { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); border-color: transparent; }
.btn-success { background: color-mix(in srgb, var(--success) 14%, transparent); color: var(--success); border-color: transparent; }
.btn-sm { padding: 9px 16px; font-size: 0.86rem; }
.btn-lg { padding: 15px 30px; font-size: 1.02rem; }
.btn-block { width: 100%; }

.icon-btn {
  width: 42px; height: 42px;
  display: inline-grid; place-items: center;
  border-radius: 12px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  color: var(--text-2);
  transition: all 0.2s var(--ease);
}
.icon-btn:hover { color: var(--brand); border-color: var(--brand); transform: translateY(-2px); }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------------------------------------------------------------- 5. BADGES */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.03em;
  background: color-mix(in srgb, var(--brand) 12%, transparent);
  color: var(--brand);
  border: 1px solid color-mix(in srgb, var(--brand) 24%, transparent);
}
.badge-success { background: color-mix(in srgb, var(--success) 14%, transparent); color: var(--success); border-color: color-mix(in srgb, var(--success) 26%, transparent); }
.badge-warn { background: color-mix(in srgb, var(--warning) 16%, transparent); color: var(--warning); border-color: color-mix(in srgb, var(--warning) 30%, transparent); }
.badge-danger { background: color-mix(in srgb, var(--danger) 13%, transparent); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 26%, transparent); }
.badge-muted { background: var(--surface-2); color: var(--muted); border-color: var(--border); }

/* ---------------------------------------------------------------- 6. HEADER */
.site-header {
  position: sticky; top: 0; z-index: 90;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; gap: 14px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; }
.brand-logo { width: 38px; height: 38px; border-radius: 11px; box-shadow: var(--shadow); }
/* Logo has its own black background — give it an edge on the dark header. */
html[data-theme="dark"] .brand-logo { box-sizing: border-box; border: 1px solid var(--border); }
.brand-name { font-size: 1.02rem; letter-spacing: -0.02em; line-height: 1.1; }
.brand-sub { display: block; font-size: 0.66rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--brand); }

.main-nav { display: none; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-link {
  padding: 9px 13px; border-radius: 10px;
  font-size: 0.92rem; font-weight: 600; color: var(--text-2);
  transition: all 0.18s var(--ease);
}
.nav-link:hover { color: var(--brand); background: color-mix(in srgb, var(--brand) 9%, transparent); }
.nav-link.is-active { color: var(--brand); background: color-mix(in srgb, var(--brand) 11%, transparent); }

/* Subject dropdown */
.nav-drop { position: relative; }
.nav-drop-menu {
  position: absolute; top: calc(100% + 10px); left: 0;
  min-width: 250px; padding: 8px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-md); box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: all 0.2s var(--ease);
  max-height: min(70vh, 460px); overflow: auto;
}
.nav-drop.open .nav-drop-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-drop-menu a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 10px;
  font-size: 0.9rem; font-weight: 600;
}
.nav-drop-menu a:hover { background: color-mix(in srgb, var(--brand) 9%, transparent); color: var(--brand); }
.nav-drop-menu .cnt { margin-left: auto; font-size: 0.74rem; color: var(--muted); font-weight: 700; }
.nav-caret { transition: transform 0.2s var(--ease); }
.nav-drop.open .nav-caret { transform: rotate(180deg); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }

/* Mobile menu */
.mobile-menu {
  position: fixed; inset: 0; z-index: 95;
  background: var(--bg);
  padding: 18px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.32s var(--ease);
  display: flex; flex-direction: column; gap: 6px;
}
.mobile-menu.open { transform: translateX(0); }
.mm-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.mm-title { font-weight: 800; }
.mm-group { font-size: 0.74rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 18px 0 6px; }
.mm-link {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 14px; border-radius: 12px;
  font-weight: 600; background: var(--surface);
  border: 1px solid var(--border); margin-bottom: 8px;
}
.mm-link.is-active { border-color: var(--brand); color: var(--brand); }
.mm-emoji { font-size: 1.15rem; }

/* ------------------------------------------------------------------ 7. HERO */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 74px);
  background:
    radial-gradient(900px 420px at 82% -10%, color-mix(in srgb, var(--brand) 22%, transparent), transparent 60%),
    radial-gradient(700px 400px at 6% 110%, color-mix(in srgb, var(--brand-3) 16%, transparent), transparent 62%),
    var(--bg);
}
.hero-grid {
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 0.8rem; font-weight: 700; box-shadow: var(--shadow);
}
.pulse-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--success);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--success) 65%, transparent); }
  70% { box-shadow: 0 0 0 9px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.hero h1 { margin: 18px 0 6px; }
.hero h1 .grad {
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-tagline {
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 700; color: var(--text-2);
  margin-bottom: 10px;
}
.hero-sub { color: var(--muted); max-width: 56ch; margin-bottom: 24px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* Hero visual cards */
.hero-visual { position: relative; min-height: 260px; }
.float-card {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  padding: 16px 18px;
  animation: floaty 6s ease-in-out infinite;
}
.float-card .fc-num { font-size: 1.5rem; font-weight: 800; color: var(--brand); }
.float-card .fc-label { font-size: 0.78rem; color: var(--muted); font-weight: 600; }
.fc-1 { top: 6%; left: 4%; }
.fc-2 { top: 38%; right: 2%; animation-delay: 1.4s; }
.fc-3 { bottom: 4%; left: 16%; animation-delay: 2.6s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-13px); }
}

/* --------------------------------------------------------------- 8. STAT BOX */
.stats-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 20px 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.stat-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.stat-emoji { font-size: 1.5rem; }
.stat-num {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  font-weight: 800; letter-spacing: -0.03em;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label { font-size: 0.82rem; color: var(--muted); font-weight: 600; }

/* -------------------------------------------------------------- 9. CARD GRID */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s;
}
.card-pad { padding: 22px; }
a.card:hover, .card.hoverable:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--brand) 40%, var(--border));
}

.subject-card { position: relative; overflow: hidden; padding: 24px 22px; display: block; }
.subject-card::after {
  content: ""; position: absolute; inset: auto -30% -60% auto;
  width: 180px; height: 180px; border-radius: 50%;
  background: var(--sc, var(--brand)); opacity: 0.09;
  transition: transform 0.4s var(--ease);
}
.subject-card:hover::after { transform: scale(1.35); }
.subject-icon {
  width: 54px; height: 54px; border-radius: 16px;
  display: grid; place-items: center;
  font-size: 1.5rem; font-weight: 800;
  background: color-mix(in srgb, var(--sc, var(--brand)) 15%, transparent);
  color: var(--sc, var(--brand));
  border: 1.5px solid color-mix(in srgb, var(--sc, var(--brand)) 32%, transparent);
  margin-bottom: 14px;
}
.subject-card h3 { margin-bottom: 6px; }
.subject-card p { color: var(--muted); font-size: 0.88rem; min-height: 42px; }
.subject-meta { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }

/* Quiz / topic card */
.quiz-card { padding: 18px 20px; display: flex; align-items: center; gap: 16px; }
.quiz-card .qc-icon {
  width: 46px; height: 46px; flex: none;
  border-radius: 13px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--brand) 12%, transparent);
  font-size: 1.2rem;
}
.quiz-card h4 { font-size: 1rem; margin-bottom: 3px; }
.quiz-card .qc-sub { font-size: 0.8rem; color: var(--muted); }
.quiz-card .qc-go {
  margin-left: auto; flex: none;
  width: 40px; height: 40px; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--brand-grad); color: #fff;
  transition: transform 0.2s var(--ease);
}
a.quiz-card:hover .qc-go { transform: translateX(4px); }

/* Topic declared but its JSON file has no questions yet */
.quiz-card.disabled { opacity: 0.72; cursor: not-allowed; }
.quiz-card.disabled:hover { transform: none; box-shadow: var(--shadow); border-color: var(--border); }
.quiz-card.disabled .qc-icon { background: var(--surface-2); }
.quiz-card.disabled .qc-go { background: var(--surface-2); color: var(--muted); }

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: clamp(34px, 6vw, 58px) 22px;
  border: 2px dashed var(--border);
  border-radius: var(--r-xl);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}
.empty-state .es-icon {
  width: 68px; height: 68px; margin: 0 auto 16px;
  border-radius: 20px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--brand) 11%, transparent);
  font-size: 1.9rem;
}
.empty-state h3 { margin-bottom: 8px; }
.empty-state p { color: var(--muted); max-width: 52ch; margin-inline: auto; }
.empty-state code {
  background: var(--surface-2); border: 1px solid var(--border);
  padding: 3px 9px; border-radius: 7px; font-size: 0.85em;
}

/* ---------------------------------------------------------------- 10. SEARCH */
.search-overlay {
  position: fixed; inset: 0; z-index: 120;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 12vh 18px 18px;
  overflow-y: auto;
  animation: fadeIn 0.18s var(--ease);
}
.search-panel { max-width: 640px; margin-inline: auto; }
.search-box {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 999px; padding: 11px 18px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-box:focus-within { border-color: var(--brand); box-shadow: 0 0 0 4px var(--ring); }
.search-box input { flex: 1; border: 0; background: none; outline: none; min-width: 0; }
.search-box .kbd {
  font-size: 0.7rem; font-weight: 700; color: var(--muted);
  border: 1px solid var(--border); border-radius: 6px; padding: 2px 7px;
}
.search-results { display: grid; gap: 10px; margin-top: 18px; }

/* --------------------------------------------------------------- 11. BANNERS */
.banner-telegram {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 22px 24px;
  border-radius: var(--r-xl);
  background: linear-gradient(120deg, #229ed9 0%, #1e88c5 55%, #4f46e5 160%);
  color: #fff;
  box-shadow: 0 20px 44px -22px rgba(34, 158, 217, 0.9);
  position: relative; overflow: hidden;
}
.banner-telegram::after {
  content: ""; position: absolute; right: -50px; top: -50px;
  width: 190px; height: 190px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
}
.banner-telegram .bt-title { font-size: clamp(1.05rem, 2.4vw, 1.35rem); font-weight: 800; }
.banner-telegram .bt-sub { font-size: 0.9rem; opacity: 0.92; }
.banner-telegram .btn { background: #fff; color: #1478a8; border: 0; position: relative; z-index: 1; }

/* Advertisement slot (managed in HTML - never a popup) */
.ad-slot {
  border: 2px dashed var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 65%, transparent);
  min-height: 110px;
  display: grid; place-items: center;
  text-align: center; padding: 18px;
  color: var(--muted);
}
.ad-slot .ad-label {
  font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase;
  font-weight: 800; color: var(--muted); margin-bottom: 4px;
}

/* ---------------------------------------------------------------- 12. FOOTER */
.site-footer {
  margin-top: auto;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding-top: 46px;
}
.footer-grid {
  display: grid; gap: 30px;
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: 34px;
}
.footer-brand p { color: var(--muted); font-size: 0.9rem; margin-top: 12px; max-width: 40ch; }
.footer-col h4 {
  font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 14px;
}
.footer-col a {
  display: block; padding: 5px 0; font-size: 0.92rem;
  color: var(--text-2); transition: color 0.18s, transform 0.18s;
}
.footer-col a:hover { color: var(--brand); transform: translateX(4px); }
.social-row { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.social-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 15px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border);
  font-size: 0.85rem; font-weight: 700;
  transition: all 0.2s var(--ease);
}
.social-link:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 18px 0;
  display: flex; flex-wrap: wrap; gap: 10px 20px;
  align-items: center; justify-content: space-between;
  font-size: 0.85rem; color: var(--muted);
}
.footer-bottom nav { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-bottom a:hover { color: var(--brand); }

/* ------------------------------------------------------------ 13. PAGE HERO */
.page-hero {
  padding: clamp(30px, 5vw, 54px) 0 clamp(20px, 3vw, 30px);
  background:
    radial-gradient(700px 300px at 90% -40%, color-mix(in srgb, var(--brand) 20%, transparent), transparent 60%),
    var(--bg-2);
  border-bottom: 1px solid var(--border);
}
.breadcrumb { display: flex; gap: 8px; align-items: center; font-size: 0.84rem; color: var(--muted); margin-bottom: 12px; flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span { opacity: 0.6; }

/* --------------------------------------------------------- 14. TOAST + misc */
.toast-wrap {
  position: fixed; left: 50%; bottom: 26px; z-index: 150;
  transform: translateX(-50%);
  display: flex; flex-direction: column; gap: 10px; align-items: center;
  pointer-events: none;
}
.toast {
  background: var(--text); color: var(--bg);
  padding: 11px 20px; border-radius: 999px;
  font-size: 0.88rem; font-weight: 700;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s var(--ease);
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* Back to top */
.to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 80;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  transform: translateY(12px);
}
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }

/* Install PWA bar */
.install-bar { display: none; }
.install-bar.show { display: inline-flex; }

/* Skeleton loading */
.skeleton {
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--border) 37%, var(--surface-2) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.3s infinite;
  border-radius: var(--r-md);
}
@keyframes shimmer { to { background-position: -135% 0; } }

/* ------------------------------------------------------------ 15. RESPONSIVE */
@media (min-width: 640px) {
  .stats-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .subjects-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .container { padding-inline: 26px; }
  .main-nav { display: block; }
  .menu-toggle { display: none; }
  .hero-grid { grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr); }
  .hero-visual { min-height: 340px; }
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .subjects-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1.2fr; }
}

@media (min-width: 1100px) {
  .subjects-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* Print */
@media print {
  .site-header, .site-footer, .to-top, .toast-wrap, .ad-slot { display: none !important; }
}