/* ============================================================
   axomexam — style.css
   Clean, modern, responsive design with futuristic accents.
   ============================================================ */

:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --primary-light: #6366f1;
  --accent: #22d3ee;
  --accent-2: #a78bfa;
  --ink: #0f172a;
  --ink-soft: #475569;
  --ink-faint: #94a3b8;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-tint: #eef2ff;
  --line: #e2e8f0;
  --card-shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px -12px rgba(15, 23, 42, .12);
  --card-shadow-hover: 0 2px 4px rgba(15, 23, 42, .08), 0 16px 40px -16px rgba(79, 70, 229, .28);
  --radius: 14px;
  --radius-sm: 9px;
  --font-en: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-as: "Noto Sans Bengali", "Inter", sans-serif;
  --header-h: 64px;
  --grad: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #22d3ee 130%);
  --transition: .22s cubic-bezier(.4, 0, .2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-en);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Assamese font is applied only to question/answer content; the
   rest of the UI always stays in English. */
body[data-lang="as"] .qa-card,
body[data-lang="as"] .quiz-card,
body[data-lang="as"] .quiz-option,
body[data-lang="as"] .quiz-qtext,
body[data-lang="as"] .quiz-reveal-answer,
body[data-lang="as"] .review-item,
body[data-lang="as"] .sp-topic {
  font-family: var(--font-as);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }
ul { list-style: none; }
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; }

.container { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* ============================================================
   Preloader
   ============================================================ */
#preloader {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  background: var(--bg);
  transition: opacity .45s ease, visibility .45s ease;
}
#preloader.done { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-logo {
  font-size: 2.1rem; font-weight: 800; letter-spacing: -.5px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.loader-bar { width: 180px; height: 4px; border-radius: 99px; background: var(--line); overflow: hidden; }
.loader-bar span { display: block; height: 100%; width: 40%; border-radius: 99px; background: var(--grad); animation: loadslide 1.1s ease-in-out infinite; }
@keyframes loadslide { 0% { transform: translateX(-110%); } 100% { transform: translateX(460%); } }

/* ============================================================
   Top bar
    ============================================================ */
/* Top announcement bar was removed; language lives in header (desktop)
   and inside the mobile menu (mobile). */

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 200;
  background: rgba(255, 255, 255, .97);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 3px 16px -10px rgba(79, 70, 229, .22);
}
.header-inner { display: flex; align-items: center; gap: 16px; height: var(--header-h); }

/* Centers the search box + theme toggle as one group in the middle */
.header-center {
  display: flex; align-items: center; justify-content: center;
  flex: 1; min-width: 0; gap: 12px;
}
.header-center .search-wrap { flex: 0 1 520px; margin: 0; }

.brand { display: inline-flex; align-items: center; gap: 9px; flex-shrink: 0; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 11px;
  background: var(--grad); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 1.15rem;
  box-shadow: 0 4px 14px -4px rgba(79, 70, 229, .6);
}
.brand-text { font-size: 1.28rem; font-weight: 800; letter-spacing: -.5px; }

/* Brand shown inside the hero banner (mobile, since header logo is hidden) */
.hero-brand { display: none; align-items: center; gap: 9px; margin-bottom: 14px; width: max-content; }
.hero-brand .brand-mark { width: 34px; height: 34px; border-radius: 10px; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.35); color: #fff; font-size: 1.05rem; box-shadow: none; }
.hero-brand .brand-text { color: #fff; font-size: 1.15rem; text-shadow: 0 1px 8px rgba(0,0,0,.25); }

/* ----- Search ----- */
.search-wrap { position: relative; flex: 1; max-width: 520px; margin: 0 auto; }
.search-wrap .search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 17px; height: 17px; color: var(--ink-faint); pointer-events: none; }
#master-search {
  width: 100%; height: 42px;
  border: 1px solid var(--line); border-radius: 99px;
  padding: 0 16px 0 40px;
  background: var(--bg-soft); color: var(--ink);
  font-size: .92rem; outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
#master-search:focus { background: #fff; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(79, 70, 229, .12); }
.search-results {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0; z-index: 400;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  box-shadow: 0 20px 45px -15px rgba(15, 23, 42, .28);
  max-height: 420px; overflow-y: auto;
}
.sr-head { padding: 9px 14px; font-size: .74rem; font-weight: 700; letter-spacing: .6px; text-transform: uppercase; color: var(--ink-faint); border-bottom: 1px solid var(--line); }
.sr-item { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border-bottom: 1px solid var(--line); cursor: pointer; transition: background var(--transition); }
.sr-item:last-child { border-bottom: none; }
.sr-item:hover, .sr-item.active { background: var(--bg-tint); }
.sr-item .chip { font-size: .68rem; font-weight: 700; padding: 2px 7px; border-radius: 6px; background: var(--bg-tint); color: var(--primary); white-space: nowrap; }
.sr-item .sr-title { font-size: .9rem; font-weight: 600; }
.sr-item .sr-sub { font-size: .78rem; color: var(--ink-faint); }
.sr-empty { padding: 18px 14px; text-align: center; color: var(--ink-faint); font-size: .88rem; }

/* ----- Dedicated search page (mobile) ----- */
.search-page { max-width: 720px; margin: 0 auto; padding: 26px 0 60px; }
.search-page .sp-bar { position: relative; }
.search-page .sp-bar .search-icon { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); width: 19px; height: 19px; color: var(--ink-faint); pointer-events: none; }
.search-page .sp-bar input {
  width: 100%; height: 52px; border-radius: 16px;
  border: 1.5px solid var(--line); background: #fff;
  padding: 0 18px 0 46px; font-size: 1rem; outline: none;
  box-shadow: var(--card-shadow);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-page .sp-bar input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(79,70,229,.12); }
.search-page .sp-results { margin-top: 18px; display: flex; flex-direction: column; gap: 12px; }
.sp-topic {
  display: flex; align-items: center; gap: 13px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; transition: all var(--transition);
}
.sp-topic:hover { border-color: var(--primary); box-shadow: var(--card-shadow-hover); transform: translateY(-2px); }
.sp-topic .chip { font-size: .7rem; font-weight: 800; padding: 4px 9px; border-radius: 7px; background: var(--bg-tint); color: var(--primary); flex-shrink: 0; }
.sp-topic b { display: block; font-size: .95rem; }
.sp-topic span { font-size: .8rem; color: var(--ink-faint); }
.sp-empty { text-align: center; color: var(--ink-faint); padding: 40px 0; font-size: .92rem; }

/* ----- Downloads page ----- */
.dl-list { display: flex; flex-direction: column; gap: 10px; }
.dl-item { display: flex; align-items: center; gap: 14px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; transition: border-color var(--transition), box-shadow var(--transition); }
.dl-item:hover { border-color: var(--primary); box-shadow: var(--card-shadow); }
.dl-ico { width: 40px; height: 40px; flex-shrink: 0; border-radius: 11px; background: #fee2e2; color: #dc2626; display: grid; place-items: center; }
.dl-ico svg { width: 20px; height: 20px; }
.dl-meta { flex: 1; min-width: 0; }
.dl-meta b { display: block; font-size: .95rem; }
.dl-meta span { font-size: .8rem; color: var(--ink-faint); }
.dl-btn { padding: 8px 15px; border-radius: 99px; font-size: .82rem; font-weight: 700; white-space: nowrap; transition: all var(--transition); }
.dl-save { background: var(--grad); color: #fff; box-shadow: 0 6px 14px -6px rgba(79, 70, 229, .5); }
.dl-save:hover { transform: translateY(-1px); box-shadow: 0 10px 20px -8px rgba(79, 70, 229, .6); }
@media (max-width: 560px) {
  .dl-item { flex-wrap: wrap; }
  .dl-save { flex: none; padding: 7px 13px; font-size: .76rem; }
}

/* ----- Submit Q&A page ----- */
.submit-panel { max-width: 640px; margin: 0 auto; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--card-shadow); padding: 26px; }
.submit-panel label { display: block; font-size: .86rem; font-weight: 700; margin-bottom: 16px; }
.submit-panel input, .submit-panel textarea { width: 100%; margin-top: 6px; border: 1.5px solid var(--line); border-radius: 12px; padding: 11px 14px; font-size: .94rem; font-family: inherit; outline: none; transition: border-color var(--transition), box-shadow var(--transition); background: var(--bg-soft); color: var(--ink); }
.submit-panel input:focus, .submit-panel textarea:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 4px rgba(79, 70, 229, .1); }
.submit-panel textarea { resize: vertical; }
.submit-hint { display: flex; gap: 8px; align-items: flex-start; font-size: .8rem; color: var(--ink-faint); margin: 4px 0 18px; }
.submit-hint svg { flex-shrink: 0; margin-top: 2px; }
.submit-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.submit-actions .btn { flex: 1; min-width: 180px; }

/* ----- Hamburger ----- */
.hamburger { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 42px; height: 42px; padding: 8px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); flex-shrink: 0; }
.hamburger span { display: block; height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: var(--transition); transform-origin: center; }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ----- Theme toggle (dark mode) ----- */
.theme-toggle {
  display: grid; place-items: center;
  width: 42px; height: 42px; flex-shrink: 0;
  border-radius: 10px; border: 1px solid var(--line); background: var(--bg);
  color: var(--ink-soft); transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--primary); color: var(--primary); background: var(--bg-tint); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

/* Theme toggle inside the mobile menu head (opposite of the brand) */
.m-theme-toggle {
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-soft);
}
.m-theme-toggle svg { width: 17px; height: 17px; }
.mobile-menu-head .m-theme-toggle { margin-left: auto; }
.mobile-menu-head .m-close { margin-left: 0; }

/* Previous year questions item in the mobile menu */
.mobile-nav .m-py a.m-item {
  display: flex; align-items: center; gap: 10px;
  margin: 10px 0 2px; padding: 13px 14px; border-radius: 12px;
  background: var(--bg-tint); color: var(--ink);
  font-weight: 700; border: 1px solid var(--line);
}
.mobile-nav .m-py a.m-item svg { width: 18px; height: 18px; color: var(--primary); }

/* ============================================================
   Navigation (desktop)
   ============================================================ */
.main-nav { border-top: 1px solid var(--line); background: linear-gradient(180deg, #eef1ff 0%, #fff 65%); }
.nav-inner { position: relative; }
.nav-list { display: flex; align-items: center; justify-content: center; gap: 2px; position: relative; padding: 6px 0; flex-wrap: wrap; }
.nav-list > li { position: relative; }

.nav-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 15px; margin: 2px; border-radius: 10px;
  font-size: .92rem; font-weight: 600;
  color: var(--ink-soft); transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover { color: var(--primary); background: rgba(79, 70, 229, .09); }
.nav-link.active { color: #fff; background: var(--grad); box-shadow: 0 6px 16px -6px rgba(79, 70, 229, .55); }
.nav-link .caret { width: 8px; height: 8px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg) translateY(-2px); transition: transform var(--transition); opacity: .7; }

.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  box-shadow: 0 20px 45px -15px rgba(15, 23, 42, .25);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  z-index: 300; padding: 6px;
}
.has-drop:hover > .dropdown,
.has-drop:focus-within > .dropdown,
.dropdown:hover { opacity: 1; visibility: visible; transform: translateY(0); }

.dropdown a { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 9px 12px; font-size: .87rem; font-weight: 500; color: var(--ink-soft); border-radius: 7px; transition: all var(--transition); }
.dropdown a:hover { background: var(--bg-tint); color: var(--primary); }
.dropdown a.active { color: var(--primary); font-weight: 700; background: var(--bg-tint); }
.dropdown .d-caret { width: 6px; height: 6px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(-45deg); opacity: .5; flex-shrink: 0; }

/* Third level */
.dropdown .dropdown { top: -6px; left: 100%; margin-left: 4px; }
.has-drop .has-drop:hover > .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }

/* Dropdown section label */
.dropdown .d-label { padding: 8px 12px 4px; font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .7px; color: var(--ink-faint); }

/* ============================================================
   Mobile menu
   ============================================================ */
.mobile-menu {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 500;
  width: min(340px, 86vw);
  background: #fff; box-shadow: -20px 0 60px -20px rgba(15, 23, 42, .35);
  transform: translateX(105%); transition: transform .3s cubic-bezier(.4, 0, .2, 1);
  overflow-y: auto; display: flex; flex-direction: column;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-backdrop { position: fixed; inset: 0; z-index: 490; background: rgba(15, 23, 42, .5); opacity: 0; transition: opacity .3s; }
.mobile-backdrop.open { opacity: 1; }

.mobile-menu-head { display: flex; align-items: center; gap: 10px; padding: 18px 16px 8px; }
.mobile-menu-head .brand-mark { width: 32px; height: 32px; font-size: 1rem; border-radius: 9px; }
.mobile-menu-head .brand-text { font-size: 1.12rem; }
.m-close {
  margin-left: auto; width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center;
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--ink-soft);
  transition: all var(--transition);
}
.m-close:hover { background: #fef2f2; color: #dc2626; border-color: #fecaca; }
.m-close svg { width: 18px; height: 18px; }

.mobile-nav { padding: 0 14px 24px; }
.mobile-nav > li { border-bottom: 1px solid var(--line); }
.mobile-nav .m-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.mobile-nav a.m-item { flex: 1; display: block; padding: 13px 6px; font-weight: 600; font-size: .95rem; color: var(--ink); }
.mobile-nav .m-item.active { color: var(--primary); }
.mobile-nav .m-download a.m-item {
  display: flex; align-items: center; gap: 10px;
  margin: 10px 0 4px; padding: 13px 14px; border-radius: 12px;
  background: var(--grad); color: #fff; font-weight: 700;
  box-shadow: 0 8px 18px -8px rgba(79, 70, 229, .5);
}
.mobile-nav .m-download a.m-item svg { width: 18px; height: 18px; }
.m-toggle { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 8px; color: var(--ink-faint); transition: var(--transition); }
.m-toggle:hover { background: var(--bg-tint); }
.m-toggle .caret { width: 9px; height: 9px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg) translateY(-2px); transition: transform var(--transition); }
.m-toggle.open .caret { transform: rotate(225deg) translateY(0); }
.m-sub { display: none; padding: 0 0 10px 16px; border-left: 2px solid var(--line); margin-left: 8px; }
.m-sub.open { display: block; }
.m-sub a { display: block; padding: 9px 8px; font-size: .88rem; font-weight: 500; color: #000; }
.m-sub a:hover { color: var(--primary); }
.m-sub a.m-sub-link { font-weight: 600; color: var(--ink); }
.m-sub a.m-sub-link.active { color: var(--primary); }
.m-nested { padding-left: 14px; }
.m-menu-label {
  padding: 18px 8px 6px; margin-top: 6px; border-top: 1px solid var(--line);
  font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .8px; color: var(--ink-faint);
}

/* ============================================================
   Hero / Homepage  (compact, unique, app-like)
   ============================================================ */
.hero {
  position: relative; overflow: hidden;
  border-radius: 20px; margin-top: 22px;
  display: grid; grid-template-columns: 1fr auto; gap: 24px;
  align-items: center;
  padding: 38px 40px;
  color: #fff;
  background: linear-gradient(135deg, #312e81 0%, #4f46e5 45%, #6d28d9 80%, #22d3ee 135%);
  isolation: isolate;
  box-shadow: 0 24px 60px -24px rgba(79, 70, 229, .55);
}
.hero::before { /* animated mesh */
  content: ""; position: absolute; inset: -40%; z-index: -1;
  background:
    radial-gradient(38% 55% at 78% 22%, rgba(34, 211, 238, .35), transparent 60%),
    radial-gradient(42% 60% at 15% 85%, rgba(167, 139, 250, .4), transparent 62%),
    radial-gradient(30% 45% at 50% 50%, rgba(255, 255, 255, .08), transparent 65%);
  animation: mesh-drift 14s ease-in-out infinite alternate;
}
@keyframes mesh-drift {
  0%   { transform: translate(0, 0) rotate(0deg) scale(1); }
  100% { transform: translate(3%, 2%) rotate(2deg) scale(1.06); }
}
.hero::after { /* subtle grid */
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at 75% 40%, #000 0%, transparent 75%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .72rem; font-weight: 700; letter-spacing: 1.1px; text-transform: uppercase;
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25);
  padding: 5px 13px; border-radius: 99px; margin-bottom: 12px;
}
.hero h1 { font-size: clamp(1.35rem, 3vw, 2rem); font-weight: 800; letter-spacing: -.6px; max-width: 620px; }
.hero p.sub { margin-top: 10px; max-width: 560px; font-size: clamp(.88rem, 1.4vw, .98rem); opacity: .92; }
.hero-actions { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 99px; font-weight: 700; font-size: .9rem;
  transition: all var(--transition); border: 1px solid transparent;
}
.btn-primary { background: #fff; color: var(--primary-dark); box-shadow: 0 8px 20px -8px rgba(0,0,0,.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 26px -10px rgba(0,0,0,.35); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.22); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--bg-tint); }
.btn-accent { background: var(--grad); color: #fff; box-shadow: 0 8px 18px -8px rgba(79,70,229,.55); }
.btn-accent:hover { transform: translateY(-2px); }

.hero-stats { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 22px; }
.hero-stats .stat b { display: block; font-size: 1.25rem; font-weight: 800; }
.hero-stats .stat span { font-size: .78rem; opacity: .85; }

/* ---- Unique visual: countdown ring + floating chips ---- */
.hero-visual { position: relative; width: 172px; height: 172px; display: grid; place-items: center; flex-shrink: 0; }
.countdown-ring { position: relative; width: 150px; height: 150px; }
.countdown-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.countdown-ring .ring-bg { fill: none; stroke: rgba(255,255,255,.14); stroke-width: 7; }
.countdown-ring .ring-fg { fill: none; stroke: #fff; stroke-width: 7; stroke-linecap: round; stroke-dasharray: 314; transition: stroke-dashoffset 1s ease; }
.ring-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.ring-center .ring-num { font-size: 1.35rem; font-weight: 800; letter-spacing: -.5px; line-height: 1.1; }
.ring-center .ring-label { font-size: .62rem; opacity: .8; letter-spacing: 1.2px; text-transform: uppercase; margin-top: 3px; }
.float-chip {
  position: absolute; display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 11px; border-radius: 99px; font-size: .72rem; font-weight: 700;
  background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.3);
  white-space: nowrap;
  animation: floaty 6s ease-in-out infinite;
}
.float-chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--chip, #fff); box-shadow: 0 0 8px var(--chip, #fff); }
.float-chip.c1 { top: -8px; left: -22px; --chip: #22d3ee; }
.float-chip.c2 { bottom: 2px; right: -26px; --chip: #fbbf24; animation-delay: -1.6s; }
.float-chip.c3 { top: 48%; right: -38px; --chip: #f472b6; animation-delay: -3s; }
@keyframes floaty { 0%,100% { transform: translateY(0) } 50% { transform: translateY(-11px) } }

/* ----- Section scaffolding ----- */
.section { padding: 40px 0 8px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 14px; margin-bottom: 22px; }
.section-head h2 { font-size: 1.35rem; letter-spacing: -.4px; }
.section-head .sec-sub { color: var(--ink-faint); font-size: .88rem; margin-top: 2px; }
.see-all { font-size: .86rem; font-weight: 600; color: var(--primary); white-space: nowrap; }
.see-all:hover { text-decoration: underline; }

/* ----- Category grid ----- */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.cat-card {
  position: relative; overflow: hidden;
  display: flex; gap: 14px; align-items: center;
  background: color-mix(in srgb, var(--cat, var(--primary)) 7%, #fff);
  border: 1px solid color-mix(in srgb, var(--cat, var(--primary)) 24%, var(--line));
  border-radius: var(--radius);
  padding: 18px; transition: all var(--transition); cursor: pointer;
}
.cat-card::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--cat, var(--primary)); opacity: 1; }
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); border-color: color-mix(in srgb, var(--cat, var(--primary)) 55%, var(--line)); }
.cat-ico {
  width: 46px; height: 46px; flex-shrink: 0; border-radius: 12px;
  display: grid; place-items: center; font-size: 1.3rem; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--cat, var(--primary)) 0%, color-mix(in srgb, var(--cat, var(--primary)) 55%, #7c3aed) 100%);
  box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--cat, var(--primary)) 70%, transparent);
}
.cat-ico svg, .mock-ico svg { width: 24px; height: 24px; }
.cat-ico .cat-svg, .mock-ico .cat-svg { display: grid; place-items: center; width: 100%; height: 100%; }
.cat-meta b { display: block; font-size: .98rem; }
.cat-meta span { font-size: .8rem; color: var(--ink-faint); }
.cat-meta .cat-count { font-weight: 700; color: var(--cat, var(--primary)); }

/* ----- Trending grid ----- */
.trend-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.topic-card {
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 14px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--cat, var(--primary)) 9%, #fff), #fff 55%);
  border: 1px solid color-mix(in srgb, var(--cat, var(--primary)) 26%, var(--line));
  border-radius: var(--radius);
  padding: 16px 18px; transition: all var(--transition); cursor: pointer;
  box-shadow: 0 10px 24px -16px color-mix(in srgb, var(--cat, var(--primary)) 55%, transparent);
}
.topic-card::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: linear-gradient(90deg, var(--cat, var(--primary)), color-mix(in srgb, var(--cat, var(--primary)) 45%, #22d3ee)); }
.topic-card:hover { transform: translateY(-3px); box-shadow: 0 18px 36px -18px color-mix(in srgb, var(--cat, var(--primary)) 70%, transparent); border-color: color-mix(in srgb, var(--cat, var(--primary)) 55%, var(--line)); }
.topic-card .rank {
  width: 34px; height: 34px; flex-shrink: 0; border-radius: 10px;
  display: grid; place-items: center; font-weight: 800; font-size: .9rem;
  background: color-mix(in srgb, var(--cat, var(--primary)) 14%, #fff); color: var(--cat, var(--primary));
}
.topic-card .topic-ico {
  width: 36px; height: 36px; flex-shrink: 0; border-radius: 10px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--cat, var(--primary)) 14%, #fff);
  color: var(--cat, var(--primary));
}
.topic-card .topic-ico svg { width: 19px; height: 19px; }
.topic-card .topic-ico .cat-svg { display: grid; place-items: center; width: 100%; height: 100%; }
.topic-card b { font-size: .95rem; display: block; }
.topic-card span { font-size: .8rem; color: var(--ink-faint); }
.topic-card .trend-flame { margin-left: auto; flex-shrink: 0; font-size: 1.05rem; }

/* ----- Page header (topic/sub) ----- */
.page-head { padding: 30px 0 4px; }
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: .82rem; color: var(--ink-faint); margin-bottom: 14px; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .bc-sep { opacity: .5; }
.page-head h1 { font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -.6px; }
.page-head .page-desc { color: var(--ink-soft); margin-top: 6px; max-width: 720px; font-size: .95rem; }

/* ----- Sub-topic grid ----- */
.sub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.sub-card {
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 13px;
  background: color-mix(in srgb, var(--cat, var(--primary)) 6%, #fff);
  border: 1px solid color-mix(in srgb, var(--cat, var(--primary)) 22%, var(--line));
  border-radius: var(--radius);
  padding: 16px 18px; transition: all var(--transition); cursor: pointer;
}
.sub-card::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--cat, var(--primary)); opacity: .85; }
.sub-card:hover { transform: translateY(-3px); box-shadow: var(--card-shadow-hover); border-color: color-mix(in srgb, var(--cat, var(--primary)) 50%, var(--line)); }
.sub-card .sub-ico { width: 40px; height: 40px; flex-shrink: 0; border-radius: 11px; display: grid; place-items: center; background: color-mix(in srgb, var(--cat, var(--primary)) 13%, #fff); color: var(--cat, var(--primary)); font-weight: 700; font-size: .9rem; }
.sub-card .sub-ico svg { width: 20px; height: 20px; }
.sub-card .sub-ico .cat-svg { display: grid; place-items: center; width: 100%; height: 100%; }
.sub-card b { display: block; font-size: .96rem; color: #000; }
.sub-card span { font-size: .8rem; color: var(--ink-faint); }

/* ============================================================
   Topic page — Q&A
   ============================================================ */
.topic-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 26px; padding: 26px 0 40px; align-items: start; }

.qa-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.qa-toolbar .qt-info { font-size: .88rem; color: var(--ink-faint); }
.qa-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.btn-sm { padding: 8px 16px; font-size: .84rem; }

.qa-tool-btn { display: inline-flex; align-items: center; gap: 7px; }
.qa-tool-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.qa-tool-btn.active svg { color: #fff; }

/* EN / অসমীয়া reading language switch */
.lang-switch { display: inline-flex; border: 1px solid var(--line); border-radius: 99px; overflow: hidden; background: var(--bg-soft); }
.lang-btn { padding: 8px 16px; font-size: .84rem; font-weight: 700; color: var(--ink-faint); transition: all var(--transition); white-space: nowrap; }
.lang-btn:hover { color: var(--primary); }
.lang-btn.active { background: var(--grad); color: #fff; }

.qa-list { display: flex; flex-direction: column; gap: 16px; }
.qa-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: box-shadow var(--transition);
}
.qa-card:hover { box-shadow: var(--card-shadow); }
.qa-card .qa-q {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 18px 20px;
}
.qa-card .qa-q .qno {
  width: 30px; height: 30px; flex-shrink: 0; border-radius: 9px;
  display: grid; place-items: center; font-size: .82rem; font-weight: 800;
  background: var(--bg-tint); color: var(--primary);
}
.qa-card .qa-q .qtext { flex: 1; min-width: 0; font-weight: 600; font-size: .98rem; line-height: 1.55; overflow-wrap: anywhere; }
.qa-a { display: flex; gap: 8px; align-items: baseline; padding: 0 20px 18px 62px; animation: fadeUp .25s ease; }
.qa-a .a-label { flex-shrink: 0; font-size: .72rem; font-weight: 800; letter-spacing: .8px; text-transform: uppercase; color: var(--accent-2); line-height: 1.7; }
.qa-a .a-body { flex: 1; min-width: 0; font-size: .95rem; line-height: 1.7; color: var(--ink-soft); overflow-wrap: anywhere; }
body[data-lang="as"] .qa-a .a-label { text-transform: none; letter-spacing: 0; font-size: .78rem; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.qa-empty { text-align: center; padding: 60px 20px; color: var(--ink-faint); }
.qa-empty .big { font-size: 2.6rem; margin-bottom: 8px; }

.pager { display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 24px; }
.pager button {
  padding: 9px 20px; border-radius: 99px; border: 1px solid var(--line);
  font-size: .88rem; font-weight: 600; transition: all var(--transition);
}
.pager button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.pager button:disabled { opacity: .4; cursor: not-allowed; }
.pager .pager-info { font-size: .86rem; color: var(--ink-faint); min-width: 110px; text-align: center; }

/* ============================================================
   Reading-mode popup
   ============================================================ */
.read-modal { position: fixed; inset: 0; z-index: 700; }
.read-modal-backdrop { position: absolute; inset: 0; background: rgba(15, 23, 42, .6); }
.read-modal-box {
  position: absolute; inset: 12px; margin: auto;
  max-width: 760px; max-height: calc(100vh - 24px);
  background: #fff; border-radius: var(--radius);
  display: flex; flex-direction: column; overflow: hidden;
  box-shadow: 0 30px 80px -20px rgba(15, 23, 42, .5);
}
.read-modal-head {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px; border-bottom: 1px solid var(--line); background: var(--bg-soft);
}
.read-modal-titles { flex: 1; min-width: 0; }
.read-modal-title { display: block; font-weight: 800; font-size: 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.read-modal-sub { display: block; font-size: .76rem; color: var(--ink-faint); }
.read-close {
  width: 36px; height: 36px; flex-shrink: 0; border-radius: 10px;
  border: 1px solid var(--line); background: #fff; color: var(--ink-soft);
  display: grid; place-items: center; transition: all var(--transition);
}
.read-close:hover { background: #fef2f2; color: #dc2626; border-color: #fecaca; }
.read-modal-body { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.read-item { overflow: visible; }
.read-modal-foot { display: flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 18px; border-top: 1px solid var(--line); }
.read-modal-foot button {
  padding: 9px 20px; border-radius: 99px; border: 1px solid var(--line);
  font-size: .88rem; font-weight: 600; transition: all var(--transition);
}
.read-modal-foot button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.read-modal-foot button:disabled { opacity: .4; cursor: not-allowed; }
.read-pageinfo { font-size: .86rem; color: var(--ink-faint); min-width: 90px; text-align: center; }

/* ============================================================
   Misc pages / lists
   ============================================================ */
.simple-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; padding-bottom: 40px; }
.info-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--card-shadow); margin-bottom: 24px; }
.info-panel h2 { font-size: 1.15rem; margin-bottom: 10px; }
.info-panel p { color: var(--ink-soft); font-size: .95rem; }
.info-panel ul { margin: 12px 0 0 18px; list-style: disc; color: var(--ink-soft); font-size: .93rem; }
.info-panel ul li { margin: 5px 0; }

/* Loading / skeleton */
.loader { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; padding: 70px 0; color: var(--ink-faint); }
.spinner { width: 40px; height: 40px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--primary); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.skeleton-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; padding-bottom: 40px; }
.skel { height: 96px; border-radius: var(--radius); background: linear-gradient(90deg, #eef2f7 25%, #f8fafc 50%, #eef2f7 75%); background-size: 200% 100%; animation: shimmer 1.4s infinite; }
@keyframes shimmer { to { background-position: -200% 0; } }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { margin-top: auto; background: var(--ink); color: #cbd5e1; font-size: .88rem; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 36px; padding: 44px 24px 30px; max-width: 1600px; margin: 0 auto; }
.footer-brand .brand-text { color: #fff; font-size: 1.25rem; }
.footer-tagline { margin-top: 12px; color: #94a3b8; max-width: 320px; font-size: .86rem; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-links h4 { color: #fff; font-size: .9rem; margin-bottom: 14px; letter-spacing: .3px; }
.footer-links li { margin: 8px 0; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 16px 24px; max-width: 1600px; margin: 0 auto; font-size: .8rem; color: #64748b; }

/* ============================================================
   Toast
   ============================================================ */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: #fff; padding: 11px 20px; border-radius: 99px;
  font-size: .86rem; font-weight: 600; box-shadow: 0 14px 40px -12px rgba(0,0,0,.45);
  opacity: 0; visibility: hidden; transition: all var(--transition); z-index: 600; max-width: 90vw; text-align: center;
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ============================================================
   Mobile App Tab Bar (lives inside the sticky header)
   ============================================================ */
.tabbar {
  display: none;
  background: #fff;
  border-top: 1px solid var(--line);
  box-shadow: 0 6px 18px -12px rgba(15, 23, 42, .25);
  padding: 6px 10px calc(6px + env(safe-area-inset-top, 0px));
  gap: 2px;
}
.tab-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  padding: 7px 2px 6px; border-radius: 12px;
  font-size: .66rem; font-weight: 700; color: var(--ink-faint);
  transition: color var(--transition), background var(--transition), transform .12s ease, box-shadow var(--transition);
  min-width: 0; position: relative;
}
.tab-item svg { width: 20px; height: 20px; }
.tab-item span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.tab-item:active { transform: scale(.92); }
.tab-item.active {
  color: #fff;
  background: var(--grad);
  box-shadow: 0 6px 16px -6px rgba(79, 70, 229, .6);
}

/* ============================================================
   Mock Test UI
   ============================================================ */
.mock-intro { text-align: center; padding: 18px 0 6px; }
.mock-intro h1 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
.mock-intro p { color: var(--ink-faint); margin-top: 6px; font-size: .92rem; }

.mock-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; padding: 22px 0 44px; }
.mock-card {
  position: relative; overflow: hidden; cursor: pointer;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; transition: all var(--transition);
}
.mock-card:hover { transform: translateY(-3px); box-shadow: var(--card-shadow-hover); border-color: transparent; }
.mock-card .mock-top { display: flex; align-items: center; gap: 12px; }
.mock-card .mock-ico { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; font-weight: 800; color: #fff; background: var(--cat, var(--primary)); flex-shrink: 0; }
.mock-card b { font-size: .98rem; display: block; }
.mock-card .mock-count { font-size: .8rem; color: var(--ink-faint); }
.mock-card .mock-go { margin-top: 14px; width: 100%; }
.mock-card .mock-start { display: inline-flex; align-items: center; justify-content: center; gap: 7px; width: 100%; padding: 9px 14px; border-radius: 10px; font-weight: 700; font-size: .86rem; color: var(--cat, var(--primary)); background: color-mix(in srgb, var(--cat, var(--primary)) 10%, #fff); transition: all var(--transition); }
.mock-card .mock-start:hover { color: #fff; background: var(--cat, var(--primary)); }

/* ---- Setup screen ---- */
.setup-panel { max-width: 460px; margin: 26px auto 60px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--card-shadow); padding: 24px; }
.setup-panel .sp-title { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.setup-panel .sp-title b { font-size: 1.1rem; }
.setup-panel .sp-sub { color: var(--ink-faint); font-size: .88rem; }
.count-picker { display: flex; flex-wrap: wrap; gap: 9px; margin: 18px 0 6px; }
.count-picker button { padding: 9px 16px; border-radius: 10px; border: 1.5px solid var(--line); font-weight: 700; font-size: .9rem; transition: all var(--transition); background: #fff; }
.count-picker button:hover { border-color: var(--primary); }
.count-picker button.active { border-color: var(--primary); background: var(--bg-tint); color: var(--primary); }
.setup-note { display: flex; gap: 9px; align-items: flex-start; margin-top: 16px; padding: 12px 14px; border-radius: 10px; background: var(--bg-tint); font-size: .83rem; color: var(--ink-soft); }
.setup-note svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--primary); }
.setup-panel .btn-begin { width: 100%; margin-top: 18px; }

/* ---- Quiz screen (app-like) ---- */
.quiz-wrap { max-width: 720px; margin: 0 auto 80px; }
.quiz-top { display: flex; align-items: center; gap: 12px; padding: 16px 2px; }
.quiz-top .qt-cat { font-weight: 800; font-size: .95rem; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.quiz-timer {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 13px; border-radius: 99px; font-weight: 800; font-size: .88rem; font-variant-numeric: tabular-nums;
  background: var(--bg-tint); color: var(--primary);
}
.quiz-timer.low { background: #fef2f2; color: #dc2626; animation: pulse .9s ease infinite; }
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .55 } }
.quiz-quit { padding: 7px 13px; border-radius: 10px; border: 1px solid var(--line); font-size: .84rem; font-weight: 700; color: var(--ink-soft); transition: all var(--transition); }
.quiz-quit:hover { color: #dc2626; border-color: #fecaca; background: #fef2f2; }

.quiz-progress { height: 6px; border-radius: 99px; background: var(--line); overflow: hidden; }
.quiz-progress span { display: block; height: 100%; width: 0; border-radius: 99px; background: var(--grad); transition: width .4s ease; }

.quiz-card { margin-top: 18px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--card-shadow); padding: 24px; }
.quiz-qno { font-size: .72rem; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--primary); }
.quiz-qtext { margin-top: 8px; font-size: 1.06rem; font-weight: 600; line-height: 1.6; }

.quiz-options { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.quiz-option {
  display: flex; align-items: center; gap: 12px; text-align: left;
  width: 100%; padding: 13px 15px; border-radius: 12px;
  border: 1.5px solid var(--line); background: #fff;
  font-size: .94rem; font-weight: 500; line-height: 1.5;
  transition: all .16s ease; cursor: pointer;
}
.quiz-option:hover:not(:disabled) { border-color: var(--primary); background: var(--bg-tint); }
.quiz-option:active { transform: scale(.99); }
.quiz-option .opt-key { width: 26px; height: 26px; flex-shrink: 0; border-radius: 8px; display: grid; place-items: center; font-size: .8rem; font-weight: 800; background: var(--bg-tint); color: var(--ink-soft); transition: all .16s ease; }
.quiz-option.selected { border-color: var(--primary); background: var(--bg-tint); }
.quiz-option.selected .opt-key { background: var(--primary); color: #fff; }
.quiz-option.correct { border-color: #10b981; background: #ecfdf5; }
.quiz-option.correct .opt-key { background: #10b981; color: #fff; }
.quiz-option.wrong { border-color: #ef4444; background: #fef2f2; }
.quiz-option.wrong .opt-key { background: #ef4444; color: #fff; }
.quiz-option:disabled { cursor: default; }

.quiz-flash { margin-top: 20px; padding: 16px; border-radius: 12px; background: var(--bg-tint); }
.quiz-flash .flash-q { font-size: .88rem; color: var(--ink-soft); }
.quiz-reveal-answer { margin-top: 14px; padding: 14px 16px; border-radius: 12px; background: #fff; border: 1px solid var(--line); display: none; }
.quiz-reveal-answer .a-label { font-size: .7rem; font-weight: 800; letter-spacing: .8px; text-transform: uppercase; color: var(--accent-2); }
.quiz-reveal-answer .a-body { margin-top: 6px; font-size: .95rem; line-height: 1.65; color: var(--ink-soft); }
.quiz-flash-actions { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.btn-self-good { flex: 1; padding: 11px 14px; border-radius: 12px; font-weight: 800; font-size: .9rem; background: #ecfdf5; color: #059669; border: 1.5px solid #a7f3d0; transition: all var(--transition); }
.btn-self-good:hover { background: #10b981; color: #fff; }
.btn-self-bad { flex: 1; padding: 11px 14px; border-radius: 12px; font-weight: 800; font-size: .9rem; background: #fef2f2; color: #dc2626; border: 1.5px solid #fecaca; transition: all var(--transition); }
.btn-self-bad:hover { background: #ef4444; color: #fff; }
.quiz-hint { margin-top: 12px; font-size: .8rem; color: var(--ink-faint); display: flex; gap: 7px; align-items: center; }
.quiz-hint svg { width: 15px; height: 15px; flex-shrink: 0; }

.quiz-next { margin-top: 18px; width: 100%; }
.quiz-feedback { margin-top: 16px; padding: 13px 16px; border-radius: 12px; font-weight: 700; font-size: .95rem; display: none; }
.quiz-feedback.good { background: #ecfdf5; color: #059669; }
.quiz-feedback.bad { background: #fef2f2; color: #dc2626; }

/* ---- Results ---- */
.result-wrap { max-width: 640px; margin: 0 auto 80px; }
.result-panel { background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--card-shadow); padding: 30px 24px; text-align: center; }
.result-ring { width: 132px; height: 132px; margin: 0 auto 16px; position: relative; }
.result-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.result-ring .r-bg { fill: none; stroke: var(--line); stroke-width: 9; }
.result-ring .r-fg { fill: none; stroke: var(--primary); stroke-width: 9; stroke-linecap: round; stroke-dasharray: 330; transition: stroke-dashoffset 1.2s ease; }
.result-percent { position: absolute; inset: 0; display: grid; place-items: center; font-size: 1.6rem; font-weight: 800; }
.result-msg { font-weight: 600; color: var(--ink-soft); margin-bottom: 18px; }
.result-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 20px 0; }
.rstat { padding: 12px 6px; border-radius: 12px; background: var(--bg-soft); }
.rstat b { display: block; font-size: 1.15rem; font-weight: 800; }
.rstat span { font-size: .72rem; color: var(--ink-faint); }
.rstat.good b { color: #059669; } .rstat.bad b { color: #dc2626; } .rstat.skip b { color: var(--ink-faint); }
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 8px; }

.review-list { margin-top: 24px; display: flex; flex-direction: column; gap: 12px; }
.review-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.review-item .rv-q { font-weight: 600; font-size: .95rem; line-height: 1.55; }
.review-item .rv-badge { display: inline-flex; align-items: center; gap: 5px; margin-top: 10px; padding: 4px 10px; border-radius: 99px; font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .5px; }
.review-item .rv-badge.good { background: #ecfdf5; color: #059669; }
.review-item .rv-badge.bad { background: #fef2f2; color: #dc2626; }
.review-item .rv-ans { margin-top: 8px; font-size: .88rem; color: var(--ink-soft); }
.review-item .rv-ans b { color: var(--ink); }
.review-item .rv-ans.correct-line { color: #059669; }

/* ============================================================
   Reveal-on-scroll animation
   ============================================================ */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .45s ease, transform .45s ease; }
.reveal.visible { opacity: 1; transform: none; }
/* On desktop, avoid layout-thrash by animating transform/opacity only
   and limiting infinite animations that force constant repaints. */
@media (min-width: 901px) {
  .hero::before { animation-duration: 20s; }
  .float-chip { animation-duration: 7s; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .topic-layout { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .header-inner, .brand, .search-wrap, .hamburger { display: none; }
  .main-nav { display: none; }
  .hero { padding: 30px 24px; grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-brand { display: flex; }
  .tabbar { display: flex; }
}

@media (min-width: 901px) {
  .mobile-menu, .mobile-backdrop { display: none !important; }

  /* Desktop only: slightly zoom the whole UI and fill the screen
     on both sides, and keep every nav button on a single line */
  html { font-size: 17px; }
  .container { max-width: 1360px; }
  .nav-list { flex-wrap: nowrap; gap: 1px; }
  .nav-link { padding: 8px 11px; margin: 0; font-size: .93rem; }
}

@media (max-width: 640px) {
  :root { --header-h: 60px; }
  .hero { margin-top: 16px; padding: 26px 20px; border-radius: 16px; }
  .hero-stats { gap: 16px; }
  .hero-stats .stat b { font-size: 1.1rem; }
  .footer-inner { grid-template-columns: 1fr; gap: 26px; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
  .qa-a { padding-left: 20px; }
  .qa-card .qa-q .qtext { font-size: .88rem; line-height: 1.5; }
  .qa-a .a-body { font-size: .85rem; line-height: 1.6; }
  .read-modal-box { inset: 0; max-height: none; border-radius: 0; }
  .read-modal-body { padding: 14px; }
  .section-head { flex-wrap: wrap; }
  .quiz-card { padding: 18px 16px; }
  .quiz-top { padding: 12px 2px; }
  .quiz-wrap, .result-wrap { margin-bottom: 70px; }
  .result-stats { grid-template-columns: repeat(2, 1fr); }
  .quiz-flash-actions { flex-direction: column; }
}

/* Keyboard focus */
:focus-visible { outline: 3px solid rgba(79, 70, 229, .45); outline-offset: 2px; border-radius: 4px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   Dark mode
   ============================================================ */
:root[data-theme="dark"] {
  --primary: #818cf8;
  --primary-dark: #a5b4fc;
  --primary-light: #818cf8;
  --accent: #22d3ee;
  --accent-2: #a78bfa;
  --ink: #e5e7eb;
  --ink-soft: #cbd5e1;
  --ink-faint: #8b9bb4;
  --ink-muted: #8b9bb4;
  --bg: #0b1120;
  --bg-soft: #0f172a;
  --bg-tint: #1e293b;
  --bg-subtle: #16203a;
  --border: #2b3a55;
  --line: #1e293b;
  --card-shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 28px -14px rgba(0,0,0,.6);
  --card-shadow-hover: 0 2px 4px rgba(0,0,0,.5), 0 18px 44px -18px rgba(129,140,248,.4);
}

/* Header, nav and other light hard-coded surfaces */
[data-theme="dark"] .site-header { background: rgba(11, 17, 32, .97); }
[data-theme="dark"] .main-nav { background: linear-gradient(180deg, #141d33 0%, #0b1120 65%); }
[data-theme="dark"] #master-search:focus { background: var(--bg-soft); }
[data-theme="dark"] .search-results { background: var(--bg-soft); }
[data-theme="dark"] .search-page .sp-bar input { background: var(--bg-soft); }
[data-theme="dark"] .sp-topic { background: var(--bg-soft); }
[data-theme="dark"] .dropdown { background: var(--bg-soft); }
[data-theme="dark"] .mobile-menu { background: var(--bg); }
[data-theme="dark"] .tabbar { background: var(--bg); }
[data-theme="dark"] .qa-card,
[data-theme="dark"] .info-panel,
[data-theme="dark"] .submit-panel,
[data-theme="dark"] .mock-card,
[data-theme="dark"] .setup-panel,
[data-theme="dark"] .quiz-card,
[data-theme="dark"] .result-panel,
[data-theme="dark"] .review-item,
[data-theme="dark"] .read-modal-box,
[data-theme="dark"] .count-picker button,
[data-theme="dark"] .quiz-option { background: var(--bg-soft); }
[data-theme="dark"] .read-close,
[data-theme="dark"] .m-close { background: var(--bg-soft); }
[data-theme="dark"] .read-close:hover,
[data-theme="dark"] .m-close:hover { background: color-mix(in srgb, #ef4444 14%, var(--bg-soft)); color: #f87171; border-color: color-mix(in srgb, #ef4444 40%, var(--line)); }

/* color-mix(... , #fff) cards — retint toward the dark background */
[data-theme="dark"] .cat-card { background: color-mix(in srgb, var(--cat, var(--primary)) 14%, #0f172a); border-color: color-mix(in srgb, var(--cat, var(--primary)) 35%, var(--line)); }
[data-theme="dark"] .topic-card { background: linear-gradient(180deg, color-mix(in srgb, var(--cat, var(--primary)) 18%, #0f172a), #0f172a 55%); }
[data-theme="dark"] .topic-card .rank,
[data-theme="dark"] .topic-card .topic-ico { background: color-mix(in srgb, var(--cat, var(--primary)) 22%, #0f172a); }
[data-theme="dark"] .sub-card { background: color-mix(in srgb, var(--cat, var(--primary)) 12%, #0f172a); border-color: color-mix(in srgb, var(--cat, var(--primary)) 30%, var(--line)); }
[data-theme="dark"] .sub-card .sub-ico { background: color-mix(in srgb, var(--cat, var(--primary)) 20%, #0f172a); }
[data-theme="dark"] .mock-card .mock-start { background: color-mix(in srgb, var(--cat, var(--primary)) 18%, #0f172a); }

/* Text colour fixes for dark surfaces */
[data-theme="dark"] .m-sub a,
[data-theme="dark"] .sub-card b { color: var(--ink); }
[data-theme="dark"] .submit-panel input:focus,
[data-theme="dark"] .submit-panel textarea:focus { background: var(--bg); }

/* Footer and toast must remain dark in dark mode */
[data-theme="dark"] .site-footer { background: #020617; }
[data-theme="dark"] .toast { background: #1e293b; color: #e5e7eb; }