/* =========================================================
   COPA MCQ  |  Main stylesheet
   ========================================================= */
:root {
  --navy-900: #071538;
  --navy-800: #0b1f4d;
  --navy-700: #10296a;
  --blue-600: #1554e0;
  --blue-500: #2a6df4;
  --blue-100: #e6eeff;
  --yellow: #ffc21a;
  --yellow-600: #f5a800;
  --green: #18a957;
  --green-100: #e3f7ec;
  --red: #e5383b;
  --red-100: #fdeaea;
  --purple: #7b3fe4;
  --purple-100: #f0e8ff;
  --orange: #f58a07;
  --orange-100: #fff1df;
  --pink-100: #ffe8ee;
  --teal: #0fa3b1;
  --ink: #12213f;
  --ink-2: #44506b;
  --ink-3: #7a849a;
  --line: #e3e8f2;
  --bg: #f3f6fc;
  --card: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 6px 24px rgba(16, 41, 106, .08);
  --shadow-lg: 0 18px 48px rgba(16, 41, 106, .16);
  --font: "Roboto", "Noto Sans Devanagari", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --font-head: "Poppins", "Noto Sans Devanagari", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --header-h: 76px;
  --sidebar-w: 236px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
body[data-lang="hi"], body[data-lang="mr"] { line-height: 1.7; }
img { max-width: 100%; display: block; }
a { color: var(--blue-600); text-decoration: none; }
button { font-family: inherit; }
h1, h2, h3, h4, h5 { margin: 0 0 .5em; line-height: 1.25; font-family: var(--font-head); }
.btn, .btn-login, .main-nav a, .top-drop a, .brand-text, .chip, .mode-tabs button, .preset b, .stat b, .r-stat b, .q-no, .q-text, .timer, .cbt-top .title, .opt .k, .verdict, .section-title h2, .auth-tabs button { font-family: var(--font-head); }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  height: var(--header-h);
  background: linear-gradient(90deg, var(--navy-900), var(--navy-800) 55%, var(--navy-700));
  color: #fff;
  display: flex; align-items: center; gap: 18px;
  padding: 0 22px;
  border-bottom: 4px solid var(--yellow);
  box-shadow: 0 4px 18px rgba(0,0,0,.18);
}
.brand { display: flex; align-items: center; gap: 12px; color: #fff; flex: none; }
.brand-logo { height: 60px; width: auto; flex: none; object-fit: contain; filter: drop-shadow(0 0 6px rgba(120,180,255,.45)) drop-shadow(0 3px 5px rgba(0,0,0,.35)); transition: transform .3s; }
.brand:hover .brand-logo { transform: rotate(-4deg) scale(1.06); }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; min-width: 0; }
.brand-text .b1 { font-weight: 800; font-size: 15px; letter-spacing: .5px; }
.brand-text .b2 { font-weight: 900; font-size: 26px; color: var(--yellow); letter-spacing: .5px; }
.brand-text .b3 { font-size: 11.5px; opacity: .85; letter-spacing: .4px; }
.brand-sep { width: 1px; height: 46px; background: rgba(255,255,255,.25); margin: 0 6px; }
.brand-iti { font-size: 10.5px; line-height: 1.25; opacity: .9; text-align: center; max-width: 150px; }
.brand-iti b { display: block; font-size: 18px; color: var(--yellow); letter-spacing: 1px; }

.main-nav { display: flex; align-items: center; gap: 4px; margin: 0 auto; }
.main-nav a {
  color: #dfe7ff; font-size: 14px; font-weight: 500;
  padding: 9px 14px; border-radius: 999px; display: flex; align-items: center; gap: 7px;
  transition: background .2s, color .2s; white-space: nowrap;
}
.main-nav a:hover { background: rgba(255,255,255,.1); color: #fff; }
.main-nav a.active { background: var(--yellow); color: var(--navy-900); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-select {
  appearance: none; -webkit-appearance: none;
  background: rgba(255,255,255,.1) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23fff'/%3E%3C/svg%3E") no-repeat right 12px center;
  color: #fff; border: 1px solid rgba(255,255,255,.3);
  border-radius: 999px; padding: 8px 30px 8px 14px; font: 500 13.5px var(--font); cursor: pointer;
}
.lang-select option { color: var(--ink); }
.btn-login {
  background: var(--yellow); color: var(--navy-900); border: 0; border-radius: 999px;
  padding: 9px 18px; font-weight: 600; font-size: 14px; cursor: pointer; display: flex; align-items: center; gap: 8px;
  box-shadow: 0 4px 12px rgba(255,194,26,.35); white-space: nowrap; max-width: 190px; overflow: hidden; text-overflow: ellipsis;
}
.btn-login:hover { background: #ffd451; }
.menu-toggle { display: none; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25); color: #fff; font-size: 18px; cursor: pointer; width: 42px; height: 42px; border-radius: 12px; }
.top-drop {
  display: none; position: absolute; left: 0; right: 0; top: 100%; z-index: 70;
  flex-direction: column; gap: 4px; padding: 12px 14px 16px;
  background: var(--navy-800); border-bottom: 4px solid var(--yellow); box-shadow: 0 18px 40px rgba(7,21,56,.35);
  transform: translateY(-8px); opacity: 0; visibility: hidden; transition: transform .2s ease, opacity .2s ease, visibility .2s;
}
.top-drop a { display: flex; align-items: center; gap: 14px; color: #dfe7ff; padding: 12px 14px; border-radius: 12px; font-weight: 500; font-size: 15px; }
.top-drop a i { width: 20px; text-align: center; }
.top-drop a:hover { background: rgba(255,255,255,.08); color: #fff; }
.top-drop a.active { background: var(--yellow); color: var(--navy-900); font-weight: 600; }

/* ---------- Layout ---------- */
.layout { display: block; min-height: calc(100vh - var(--header-h)); }
.sidebar {
  width: var(--sidebar-w); flex: none;
  background: var(--navy-800);
  color: #cfd9f5;
  padding: 18px 12px;
  position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h)); overflow-y: auto;
}
.side-nav a {
  display: flex; align-items: center; gap: 14px; color: #d9e2fb;
  padding: 12px 16px; border-radius: 12px; font-size: 15px; margin-bottom: 4px; transition: background .2s;
}
.side-nav a i { width: 20px; text-align: center; font-size: 17px; }
.side-nav a:hover { background: rgba(255,255,255,.08); color: #fff; }
.side-nav a.active { background: var(--blue-600); color: #fff; font-weight: 600; box-shadow: 0 6px 16px rgba(21,84,224,.45); }
.side-promo {
  margin-top: 22px; border-radius: 16px; padding: 22px 16px; text-align: center;
  background: radial-gradient(circle at 50% 0%, #1d3f99, var(--navy-900));
  border: 1px solid rgba(255,255,255,.1);
}
.side-promo .trophy { font-size: 54px; color: var(--yellow); filter: drop-shadow(0 6px 14px rgba(255,194,26,.4)); }
.side-promo p { margin: 10px 0 0; color: #fff; font-style: italic; font-weight: 600; font-size: 17px; line-height: 1.35; }
.side-promo p span { color: var(--yellow); font-family: "Brush Script MT", cursive; font-size: 22px; }
.sidebar-backdrop { display: none; }

.content { flex: 1; min-width: 0; padding: 26px 28px 40px; }
.container { max-width: 1280px; margin: 0 auto; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy-900); color: #c7d2ee; padding: 18px 26px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 14px;
}
.site-footer b { color: #fff; }
.site-footer .tag { font-style: italic; color: #fff; }
.socials { display: flex; gap: 10px; }
.socials a { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 16px; }
.socials .yt { background: #ff0000; } .socials .tg { background: #229ed9; } .socials .wa { background: #25d366; }

/* ---------- Generic components ---------- */
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--line); }
.card-pad { padding: 22px; }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 30px 0 16px; flex-wrap: wrap; }
.section-title h2 { font-size: 22px; margin: 0; padding-left: 14px; border-left: 5px solid var(--blue-600); }
.section-title a { font-size: 14px; font-weight: 600; }
.page-head { margin-bottom: 22px; }
.page-head h1 { font-size: 28px; margin-bottom: 6px; }
.page-head p { margin: 0; color: var(--ink-2); }
.breadcrumb { font-size: 13px; color: var(--ink-3); margin-bottom: 8px; }
.breadcrumb a { color: var(--ink-3); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  border: 0; border-radius: 999px; padding: 12px 22px; font-weight: 600; font-size: 15px;
  cursor: pointer; transition: transform .15s, box-shadow .2s, background .2s; text-align: center;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--blue-600); color: #fff; box-shadow: 0 8px 18px rgba(21,84,224,.3); }
.btn-primary:hover { background: #0f45c2; }
.btn-yellow { background: var(--yellow); color: var(--navy-900); box-shadow: 0 8px 18px rgba(255,194,26,.4); }
.btn-yellow:hover { background: #ffd451; }
.btn-outline { background: #fff; color: var(--blue-600); border: 2px solid var(--blue-600); }
.btn-outline:hover { background: var(--blue-100); }
.btn-ghost { background: var(--blue-100); color: var(--blue-600); }
.btn-green { background: var(--green); color: #fff; }
.btn-red { background: var(--red); color: #fff; }
.btn-sm { padding: 8px 14px; font-size: 13.5px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 600; background: var(--blue-100); color: var(--blue-600); }
.chip.green { background: var(--green-100); color: var(--green); }
.chip.red { background: var(--red-100); color: var(--red); }
.chip.purple { background: var(--purple-100); color: var(--purple); }
.chip.orange { background: var(--orange-100); color: var(--orange); }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.input, select.input {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--line); border-radius: 10px; font: 15px var(--font); color: var(--ink); background: #fff;
}
.input:focus { outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(42,109,244,.15); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; border-radius: 22px;
  background: linear-gradient(115deg, #ffffff 0%, #eef4ff 40%, #cfe0ff 70%, #2a6df4 100%);
  display: grid; grid-template-columns: 1.15fr 1fr 320px; gap: 22px; align-items: center;
  padding: 30px 30px 30px 36px; box-shadow: var(--shadow); border: 1px solid var(--line);
}
.hero::before {
  content: ""; position: absolute; right: -120px; top: -140px; width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle, rgba(21,84,224,.35), rgba(21,84,224,0) 65%); pointer-events: none;
}
.hero-badge { display: inline-block; background: var(--blue-600); color: #fff; padding: 5px 16px; border-radius: 999px; font-weight: 600; font-size: 15px; }
.hero h1 { font-size: clamp(38px, 5vw, 64px); font-weight: 900; margin: 10px 0 6px; color: var(--navy-800); letter-spacing: -1px; }
.hero h1 span { color: var(--blue-600); }
.hero .lead { font-size: 19px; font-weight: 700; color: var(--navy-700); margin: 0 0 14px; }
.hero ul { list-style: none; padding: 0; margin: 0 0 20px; }
.hero li { display: flex; align-items: center; gap: 10px; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
.hero li i { color: #fff; background: var(--green); border-radius: 50%; width: 22px; height: 22px; display: grid; place-items: center; font-size: 11px; }
.hero-art { position: relative; z-index: 1; display: flex; justify-content: center; }
.hero-art svg { width: 100%; max-width: 420px; height: auto; filter: drop-shadow(0 20px 30px rgba(7,21,56,.25)); }
.hero-art { padding-top: 34px; }
.hero-tag { z-index: 2; position: absolute; top: -8px; right: 0; transform: rotate(-12deg); font-family: "Brush Script MT", "Segoe Script", cursive; font-size: 34px; color: #fff; text-shadow: 0 3px 10px rgba(7,21,56,.35); white-space: nowrap; }

.login-card { position: relative; z-index: 1; text-align: center; padding: 24px 22px; }
.login-card .avatar { width: 74px; height: 74px; margin: 0 auto 10px; border-radius: 50%; background: var(--blue-100); color: var(--blue-600); display: grid; place-items: center; font-size: 32px; }
.login-card h3 { font-size: 20px; margin-bottom: 2px; }
.login-card p { color: var(--ink-2); margin: 0 0 16px; font-size: 14px; }
.or { display: flex; align-items: center; gap: 10px; color: var(--ink-3); font-size: 13px; margin: 12px 0; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 22px; }
.stat { display: flex; align-items: center; gap: 16px; padding: 18px 20px; }
.stat .ic { width: 58px; height: 58px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 24px; flex: none; }
.stat b { font-size: 28px; display: block; line-height: 1.1; }
.stat span { color: var(--ink-2); font-size: 14px; }

/* ---------- Subjects ---------- */
.home-grid { display: grid; grid-template-columns: 1fr 300px; gap: 22px; align-items: start; }
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(165px, 1fr)); gap: 14px; }
.subject {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px 12px 14px; text-align: center;
  color: var(--ink); transition: transform .2s, box-shadow .2s, border-color .2s; display: flex; flex-direction: column; align-items: center; gap: 8px; position: relative;
}
.subject:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.subject .s-ic { width: 54px; height: 54px; border-radius: 14px; display: grid; place-items: center; font-size: 24px; }
.subject .s-name { font-weight: 600; font-size: 14px; line-height: 1.3; }
.subject .s-meta { font-size: 12px; color: var(--ink-3); }
.subject .s-no { position: absolute; top: 8px; left: 10px; font-size: 11px; font-weight: 700; color: var(--ink-3); }
.subject .bar { width: 100%; height: 5px; border-radius: 9px; background: var(--line); overflow: hidden; margin-top: 2px; }
.subject .bar i { display: block; height: 100%; background: var(--green); border-radius: 9px; }

.progress-card h3 { display: flex; align-items: center; gap: 10px; font-size: 19px; }
.progress-wrap { display: flex; align-items: center; gap: 16px; margin: 10px 0 16px; }
.ring { --p: 0; width: 120px; height: 120px; border-radius: 50%; flex: none; display: grid; place-items: center;
  background: conic-gradient(var(--green) calc(var(--p) * 1%), #e8edf6 0); }
.ring::after { content: attr(data-label); width: 92px; height: 92px; border-radius: 50%; background: #fff; display: grid; place-items: center; font-size: 26px; font-weight: 800; color: var(--navy-800); }
.p-list { font-size: 13px; color: var(--ink-2); }
.p-list b { display: block; font-size: 18px; color: var(--navy-800); margin-bottom: 6px; }

/* ---------- Banner + quick links ---------- */
.bottom-grid { display: grid; grid-template-columns: 1fr 440px; gap: 22px; margin-top: 24px; }
.banner {
  border-radius: 18px; padding: 24px 30px; color: #fff; display: flex; align-items: center; gap: 22px; flex-wrap: wrap;
  background: linear-gradient(100deg, var(--navy-900), #1440a8 70%, #1d5ae6);
  position: relative; overflow: hidden;
}
.banner .target { font-size: 64px; color: #ff4d4f; filter: drop-shadow(0 6px 12px rgba(0,0,0,.35)); }
.banner h3 { font-size: 26px; margin: 0; line-height: 1.3; }
.banner h3 em { color: var(--yellow); font-style: italic; font-weight: 900; }
.banner .btn { margin-left: auto; }
.quick { padding: 18px; }
.quick h3 { font-size: 18px; display: flex; gap: 10px; align-items: center; }
.quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.quick-grid a { border-radius: 12px; padding: 14px 6px; text-align: center; font-weight: 600; font-size: 13.5px; color: var(--ink); display: flex; flex-direction: column; align-items: center; gap: 8px; transition: transform .2s; }
.quick-grid a:hover { transform: translateY(-3px); }
.quick-grid a i { font-size: 24px; }

/* ---------- Module page ---------- */
.module-hero { border-radius: 20px; padding: 26px 28px; color: #fff; display: flex; gap: 22px; align-items: center; flex-wrap: wrap; box-shadow: var(--shadow-lg); }
.module-hero .m-ic { width: 76px; height: 76px; border-radius: 20px; background: rgba(255,255,255,.18); display: grid; place-items: center; font-size: 36px; flex: none; }
.module-hero h1 { font-size: 28px; margin: 0 0 4px; }
.module-hero p { margin: 0; opacity: .9; }
.module-hero .m-stats { margin-left: auto; display: flex; gap: 12px; flex-wrap: wrap; }
.module-hero .m-stats div { background: rgba(255,255,255,.15); padding: 10px 16px; border-radius: 12px; text-align: center; min-width: 86px; }
.module-hero .m-stats b { display: block; font-size: 22px; }
.module-hero .m-stats span { font-size: 12px; opacity: .9; }

.mode-tabs { display: flex; gap: 10px; margin: 22px 0 18px; flex-wrap: wrap; }
.mode-tabs button { border: 2px solid var(--line); background: #fff; color: var(--ink-2); border-radius: 999px; padding: 10px 20px; font-weight: 600; font-size: 14.5px; cursor: pointer; display: flex; gap: 8px; align-items: center; }
.mode-tabs button.active { background: var(--navy-800); color: #fff; border-color: var(--navy-800); }

.practice-layout { display: grid; grid-template-columns: 1fr 290px; gap: 20px; align-items: start; }
.q-card { padding: 26px; }
.q-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.q-no { font-weight: 700; color: var(--blue-600); }
.q-text { font-size: 18.5px; font-weight: 600; margin: 0 0 16px; }
.q-alt { font-size: 14.5px; color: var(--ink-3); margin: -8px 0 16px; }
pre.code { background: #0e1a36; color: #e5edff; padding: 16px 18px; border-radius: 12px; overflow-x: auto; font: 14px/1.6 "Consolas", "Courier New", monospace; margin: 0 0 18px; }
.q-img { margin: 0 0 18px; border-radius: 10px; border: 1px solid var(--line); max-width: 560px; width: 100%; }
.options { display: grid; gap: 12px; }
.opt {
  display: flex; align-items: center; gap: 14px; text-align: left; width: 100%;
  background: #fff; border: 2px solid var(--line); border-radius: 14px; padding: 13px 16px; cursor: pointer;
  font: 500 15.5px var(--font); color: var(--ink); transition: border-color .15s, background .15s;
}
.opt:hover { border-color: var(--blue-500); background: #f7faff; }
.opt .k { width: 34px; height: 34px; border-radius: 50%; flex: none; display: grid; place-items: center; font-weight: 700; background: var(--blue-100); color: var(--blue-600); }
.opt .ot { flex: 1; word-break: break-word; }
.opt.selected { border-color: var(--blue-600); background: #eef4ff; }
.opt.selected .k { background: var(--blue-600); color: #fff; }
.opt.correct { border-color: var(--green); background: var(--green-100); }
.opt.correct .k { background: var(--green); color: #fff; }
.opt.wrong { border-color: var(--red); background: var(--red-100); }
.opt.wrong .k { background: var(--red); color: #fff; }
.opt[disabled] { cursor: default; }
.feedback { margin-top: 16px; padding: 14px 16px; border-radius: 12px; font-weight: 600; display: flex; gap: 10px; align-items: center; }
.feedback.ok { background: var(--green-100); color: #0e7a3e; }
.feedback.no { background: var(--red-100); color: #b3261e; }
.q-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 22px; flex-wrap: wrap; }

.palette-card { padding: 18px; position: sticky; top: calc(var(--header-h) + 16px); }
.palette-card h4 { font-size: 15px; margin-bottom: 12px; }
.palette { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 8px; }
.palette button { aspect-ratio: 1; border-radius: 10px; border: 1.5px solid var(--line); background: #fff; font-weight: 600; cursor: pointer; font-size: 13.5px; color: var(--ink-2); }
.palette button.cur { outline: 3px solid var(--yellow); outline-offset: 1px; }
.palette button.ok { background: var(--green); border-color: var(--green); color: #fff; }
.palette button.no { background: var(--red); border-color: var(--red); color: #fff; }
.score-line { display: flex; justify-content: space-between; font-size: 14px; margin: 14px 0 4px; }

/* Study list */
.toolbar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.toolbar .input { max-width: 340px; }
.study-item { padding: 18px 20px; margin-bottom: 12px; }
.study-item .sq { font-weight: 600; margin-bottom: 10px; }
.study-item .sq small { color: var(--blue-600); font-weight: 700; margin-right: 6px; }
.study-item ol { margin: 0 0 10px; padding-left: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 18px; }
.study-item li { font-size: 14.5px; color: var(--ink-2); padding: 6px 10px; border-radius: 8px; }
.study-item li.ans { background: var(--green-100); color: #0e7a3e; font-weight: 600; }
.study-item .alt { font-size: 13.5px; color: var(--ink-3); margin: -4px 0 10px; }

/* Module list page */
.module-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.module-card { padding: 20px; display: flex; flex-direction: column; gap: 12px; transition: transform .2s, box-shadow .2s; }
.module-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.module-card .top { display: flex; gap: 14px; align-items: center; }
.module-card .s-ic { width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; font-size: 24px; flex: none; }
.module-card h3 { font-size: 17px; margin: 0; }
.module-card .sub { font-size: 13px; color: var(--ink-3); }
.module-card .acts { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; }

/* ---------- Exam setup ---------- */
.setup-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 22px; align-items: start; }
.preset-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px; margin-bottom: 18px; }
.preset { border: 2px solid var(--line); border-radius: 14px; padding: 16px; cursor: pointer; background: #fff; text-align: left; font-family: inherit; }
.preset.active { border-color: var(--blue-600); background: #eef4ff; }
.preset b { display: block; font-size: 16px; color: var(--navy-800); }
.preset span { font-size: 13px; color: var(--ink-3); }
.mod-checks { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; max-height: 330px; overflow-y: auto; padding: 4px; }
.mod-checks label { display: flex; gap: 8px; align-items: flex-start; font-size: 13.5px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; background: #fff; }
.mod-checks input { margin-top: 3px; accent-color: var(--blue-600); }

/* ---------- CBT exam interface ---------- */
body.cbt { background: #eef1f7; }
.cbt-top { background: var(--navy-800); color: #fff; display: flex; align-items: center; gap: 16px; padding: 10px 18px; border-bottom: 4px solid var(--yellow); flex-wrap: wrap; position: sticky; top: 0; z-index: 50; }
.cbt-top .title { font-weight: 700; font-size: 17px; }
.cbt-top .title small { display: block; font-weight: 400; font-size: 12px; opacity: .8; }
.cbt-top .spacer { flex: 1; }
.timer { background: #fff; color: var(--navy-800); border-radius: 12px; padding: 6px 14px; font-weight: 800; font-size: 20px; display: flex; align-items: center; gap: 8px; font-variant-numeric: tabular-nums; }
.timer.warn { background: var(--red); color: #fff; animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .75; } }
.cbt-body { display: grid; grid-template-columns: 1fr 330px; gap: 0; min-height: calc(100vh - 70px); }
.cbt-main { padding: 18px; display: flex; flex-direction: column; min-width: 0; }
.cbt-qbar { display: flex; justify-content: space-between; align-items: center; gap: 10px; background: #fff; border: 1px solid var(--line); border-radius: 12px 12px 0 0; padding: 12px 18px; flex-wrap: wrap; }
.cbt-qbar b { color: var(--navy-800); }
.cbt-qbox { background: #fff; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 12px 12px; padding: 22px; flex: 1; }
.cbt-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.cbt-actions .grow { flex: 1; }
.btn-review { background: var(--purple); color: #fff; }
.btn-clear { background: #fff; color: var(--ink-2); border: 1.5px solid var(--line); }
.cbt-side { background: #fff; border-left: 1px solid var(--line); padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.candidate { display: flex; gap: 12px; align-items: center; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.candidate .ph { width: 56px; height: 64px; border-radius: 8px; background: var(--blue-100); color: var(--blue-600); display: grid; place-items: center; font-size: 28px; flex: none; }
.candidate b { display: block; }
.candidate span { font-size: 12.5px; color: var(--ink-3); }
.legend { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; font-size: 12px; color: var(--ink-2); }
.legend div { display: flex; align-items: center; gap: 7px; }
.st { width: 30px; height: 28px; display: grid; place-items: center; font-weight: 700; font-size: 12.5px; border-radius: 6px; border: 1.5px solid #c9d1e3; background: #f3f5fa; color: var(--ink-2); position: relative; flex: none; }
.st.na { background: var(--red); border-color: var(--red); color: #fff; border-radius: 6px 6px 14px 14px; }
.st.ans { background: var(--green); border-color: var(--green); color: #fff; border-radius: 14px 14px 6px 6px; }
.st.mr { background: var(--purple); border-color: var(--purple); color: #fff; border-radius: 50%; }
.st.amr { background: var(--purple); border-color: var(--purple); color: #fff; border-radius: 50%; }
.st.amr::after { content: ""; position: absolute; right: -3px; bottom: -3px; width: 11px; height: 11px; border-radius: 50%; background: var(--green); border: 2px solid #fff; }
.cbt-palette-head { font-weight: 700; font-size: 14px; background: var(--blue-100); color: var(--navy-800); padding: 8px 12px; border-radius: 8px; }
.cbt-palette { display: grid; grid-template-columns: repeat(auto-fill, minmax(40px, 1fr)); gap: 9px; overflow-y: auto; max-height: 42vh; padding: 4px 2px; }
.cbt-palette .st { width: 100%; height: 36px; cursor: pointer; font-size: 13px; }
.cbt-palette .st.cur { outline: 3px solid var(--yellow); outline-offset: 1px; }
.cbt-side .btn-submit { margin-top: auto; }
.palette-toggle { display: none; }

/* Instructions */
.instr { max-width: 980px; margin: 0 auto; }
.instr ol { padding-left: 22px; }
.instr li { margin-bottom: 9px; color: var(--ink-2); }
.instr .legend-row { display: flex; align-items: center; gap: 10px; margin: 6px 0; }

/* ---------- Result ---------- */
.result-hero { border-radius: 20px; padding: 28px; color: #fff; display: grid; grid-template-columns: auto 1fr auto; gap: 26px; align-items: center; background: linear-gradient(110deg, var(--navy-900), var(--blue-600)); box-shadow: var(--shadow-lg); }
.result-hero .ring { width: 150px; height: 150px; background: conic-gradient(var(--yellow) calc(var(--p) * 1%), rgba(255,255,255,.2) 0); }
.result-hero .ring::after { width: 118px; height: 118px; font-size: 30px; }
.result-hero h2 { font-size: 26px; margin-bottom: 4px; }
.verdict { display: inline-block; padding: 6px 16px; border-radius: 999px; font-weight: 700; margin-top: 8px; }
.verdict.pass { background: var(--green); } .verdict.fail { background: var(--red); }
.r-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 20px 0; }
.r-stat { padding: 16px; text-align: center; }
.r-stat b { font-size: 26px; display: block; }
.r-stat span { font-size: 13px; color: var(--ink-3); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th, .tbl td { padding: 11px 12px; border-bottom: 1px solid var(--line); text-align: left; }
.tbl th { background: #f6f8fd; color: var(--ink-2); font-weight: 600; font-size: 13px; }
.table-wrap { overflow-x: auto; }
.mini-bar { height: 8px; background: var(--line); border-radius: 9px; overflow: hidden; min-width: 90px; }
.mini-bar i { display: block; height: 100%; background: var(--green); }
.review-item { padding: 18px; margin-bottom: 12px; border-left: 5px solid var(--line); }
.review-item.c { border-left-color: var(--green); } .review-item.w { border-left-color: var(--red); } .review-item.u { border-left-color: var(--ink-3); }
.review-item .opt { cursor: default; padding: 9px 12px; font-size: 14.5px; }
.review-item .opt .k { width: 28px; height: 28px; font-size: 13px; }

/* ---------- Modal ---------- */
.modal-back { position: fixed; inset: 0; background: rgba(7,21,56,.55); display: none; align-items: center; justify-content: center; z-index: 100; padding: 16px; backdrop-filter: blur(3px); }
.modal-back.show { display: flex; }
.modal { background: #fff; border-radius: 18px; width: 100%; max-width: 460px; padding: 26px; box-shadow: var(--shadow-lg); max-height: 92vh; overflow-y: auto; animation: pop .2s ease; }
.modal.wide { max-width: 640px; }
@keyframes pop { from { transform: scale(.95); opacity: 0; } }
.modal h3 { font-size: 21px; display: flex; gap: 10px; align-items: center; }
.modal .close { float: right; border: 0; background: var(--bg); width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: 16px; }
.modal-acts { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; flex-wrap: wrap; }

.toast { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(30px); background: var(--navy-800); color: #fff; padding: 12px 20px; border-radius: 12px; font-weight: 500; opacity: 0; transition: .3s; z-index: 200; pointer-events: none; box-shadow: var(--shadow-lg); max-width: calc(100% - 32px); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.empty { text-align: center; padding: 40px 20px; color: var(--ink-3); }
.empty i { font-size: 42px; margin-bottom: 10px; color: var(--blue-500); }

.about-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.feature { padding: 22px; }
.feature i { font-size: 28px; color: var(--blue-600); margin-bottom: 10px; }
.feature h3 { font-size: 17px; }
.feature p { color: var(--ink-2); margin: 0; font-size: 14.5px; }

/* ---------- Responsive ---------- */
@media (max-width: 1240px) {
  .main-nav a { padding: 9px 11px; font-size: 13.5px; gap: 6px; }
  .brand-text .b3 { display: none; }
}
@media (max-width: 1200px) {
  .hero { grid-template-columns: 1fr 1fr; }
  .login-card { grid-column: 1 / -1; display: flex; align-items: center; gap: 18px; text-align: left; flex-wrap: wrap; }
  .login-card .avatar { margin: 0; }
  .login-card .or { display: none; }
  .login-card > div:first-of-type { flex: 1; }
  .home-grid, .bottom-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .brand-sep, .brand-iti { display: none; }
}
@media (max-width: 1024px) {
  .header-actions { margin-left: auto; }
  .top-drop { display: flex; }
  body.nav-open .top-drop { transform: none; opacity: 1; visibility: visible; }
  body.nav-open .sidebar-backdrop { display: block; position: fixed; inset: var(--header-h) 0 0 0; background: rgba(7,21,56,.45); z-index: 55; }
  .practice-layout, .setup-grid { grid-template-columns: 1fr; }
  .palette-card { position: static; }
  .cbt-body { grid-template-columns: 1fr; }
  .cbt-side { position: fixed; right: 0; top: 0; bottom: 0; width: min(340px, 88vw); z-index: 80; transform: translateX(105%); transition: transform .25s; box-shadow: var(--shadow-lg); overflow-y: auto; }
  body.palette-open .cbt-side { transform: none; }
  body.palette-open .sidebar-backdrop { display: block; position: fixed; inset: 0; background: rgba(7,21,56,.45); z-index: 75; }
  .cbt-palette { max-height: none; }
  .palette-toggle { display: inline-flex; }
  .result-hero { grid-template-columns: 1fr; text-align: center; justify-items: center; }
}
@media (max-width: 720px) {
  :root { --header-h: 64px; }
  .site-header { padding: 0 12px; gap: 8px; }
  .brand-logo { height: 36px; width: auto; }
  .brand-text .b1 { font-size: 11px; }
  .brand-text .b2 { font-size: 19px; }
  .brand-text .b3 { display: none; }
  .btn-login span.lbl { display: none; }
  .btn-login { padding: 9px 12px; }
  .lang-select { padding: 7px 26px 7px 10px; font-size: 12.5px; background-position: right 9px center; }
  .content { padding: 16px 14px 30px; }
  .hero { grid-template-columns: 1fr; padding: 22px 18px; }
  .hero-art { order: -1; }
  .hero-art svg { max-width: 300px; }
  .hero-tag { font-size: 24px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat { padding: 12px; gap: 10px; flex-direction: column; text-align: center; }
  .stat .ic { width: 46px; height: 46px; font-size: 19px; }
  .stat b { font-size: 22px; }
  .subject-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
  .banner { padding: 20px; }
  .banner h3 { font-size: 20px; }
  .banner .btn { margin-left: 0; width: 100%; }
  .banner .target { font-size: 44px; }
  .q-card { padding: 18px; }
  .q-text { font-size: 16.5px; }
  .opt { padding: 11px 12px; font-size: 15px; }
  .study-item ol { grid-template-columns: 1fr; }
  .mod-checks { grid-template-columns: 1fr; }
  .r-stats { grid-template-columns: 1fr 1fr; }
  .module-hero { padding: 20px; }
  .module-hero .m-stats { margin-left: 0; width: 100%; }
  .module-hero .m-stats div { flex: 1; }
  .cbt-top { padding: 8px 12px; gap: 10px; }
  .cbt-top .title { font-size: 14px; flex: 1 1 100%; }
  .cbt-top .title small { display: none; }
  .cbt-top .spacer { display: none; }
  .module-hero .m-ic { width: 52px; height: 52px; font-size: 24px; border-radius: 14px; }
  .module-hero h1 { font-size: 22px; }
  .mode-tabs button, .mode-tabs .btn { padding: 9px 14px; font-size: 13.5px; }
  .timer { font-size: 17px; padding: 5px 10px; }
  .cbt-main { padding: 10px; }
  .cbt-qbox { padding: 16px; }
  .cbt-actions .btn { flex: 1 1 45%; padding: 11px 10px; font-size: 13.5px; }
  .cbt-actions .grow { display: none; }
  .site-footer { justify-content: center; text-align: center; }
  .page-head h1 { font-size: 23px; }
}
@media print {
  .site-header, .sidebar, .site-footer, .toolbar, .mode-tabs, .no-print { display: none !important; }
  .content { padding: 0; }
  .card { box-shadow: none; }
  .study-item { break-inside: avoid; }
}

/* ---------- Auth modal ---------- */
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; background: var(--bg); border-radius: 12px; padding: 4px; margin: 4px 0 16px; }
.auth-tabs button { border: 0; background: transparent; padding: 10px; border-radius: 9px; font: 600 14px var(--font); color: var(--ink-2); cursor: pointer; }
.auth-tabs button.on { background: #fff; color: var(--blue-600); box-shadow: 0 2px 8px rgba(16,41,106,.1); }
.auth-err { background: var(--red-100); color: #b3261e; padding: 10px 12px; border-radius: 10px; font-size: 13.5px; font-weight: 500; margin-bottom: 12px; display: flex; gap: 8px; align-items: center; }

/* ---------- Dashboard ---------- */
.dash-gate { max-width: 620px; margin: 30px auto; text-align: center; padding: 40px 28px; }
.dash-gate .gate-ic { width: 84px; height: 84px; border-radius: 50%; background: var(--blue-100); color: var(--blue-600); display: grid; place-items: center; font-size: 34px; margin: 0 auto 16px; }
.dash-gate h1 { font-size: 24px; }
.dash-gate p { color: var(--ink-2); margin: 0 0 22px; }
.gate-acts { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.dash-hero { border-radius: 22px; padding: 26px 28px; color: #fff; display: flex; align-items: center; gap: 22px; flex-wrap: wrap;
  background: linear-gradient(110deg, var(--navy-900), var(--navy-700) 55%, var(--blue-600)); box-shadow: var(--shadow-lg); position: relative; overflow: hidden; }
.dash-hero::after { content: ""; position: absolute; right: -60px; top: -80px; width: 260px; height: 260px; border-radius: 50%; background: rgba(255,194,26,.14); }
.d-ava { width: 82px; height: 82px; border-radius: 50%; background: var(--yellow); color: var(--navy-900); display: grid; place-items: center; font-size: 30px; font-weight: 800; flex: none; border: 4px solid rgba(255,255,255,.3); }
.d-info { flex: 1; min-width: 220px; position: relative; z-index: 1; }
.d-hello { opacity: .8; font-size: 14px; }
.d-info h1 { font-size: 28px; margin: 0 0 8px; }
.d-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13.5px; opacity: .9; }
.d-meta i { color: var(--yellow); margin-right: 4px; }
.d-acts { display: flex; gap: 10px; flex-wrap: wrap; position: relative; z-index: 1; }
.d-ghost { background: transparent !important; color: #fff !important; border-color: rgba(255,255,255,.6) !important; }
.d-ghost:hover { background: rgba(255,255,255,.1) !important; }
.dash-stats { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; margin: 20px 0 22px; }
.dash-stats .stat { padding: 16px; gap: 12px; }
.dash-stats .stat .ic { width: 46px; height: 46px; font-size: 19px; }
.dash-stats .stat b { font-size: 24px; }
.stat-sub { display: block; font-size: 11.5px; color: var(--ink-3); }
.dash-grid { display: grid; grid-template-columns: 1fr; gap: 22px; }
.d-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.d-head h3 { font-size: 18px; margin: 0 0 4px; display: flex; gap: 9px; align-items: center; }
.d-head p { margin: 0; font-size: 13px; color: var(--ink-3); }
.trend { position: relative; min-height: 240px; }
.tr-grid { stroke: var(--line); stroke-width: 1; }
.tr-ax { fill: var(--ink-3); font-size: 11px; font-family: var(--font); }
.tr-pass { stroke: var(--red); stroke-width: 1.5; stroke-dasharray: 6 5; opacity: .8; }
.tr-pass-l { fill: var(--ink-2); font-size: 11px; font-weight: 600; font-family: var(--font); }
.tr-line { fill: none; stroke: var(--blue-600); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.tr-dot { fill: var(--blue-600); stroke: #fff; stroke-width: 2; pointer-events: none; }
.tr-dot.f { fill: #fff; stroke: var(--red); stroke-width: 2.5; }
.tr-lab { fill: var(--ink); font-size: 12px; font-weight: 700; font-family: var(--font); }
.tr-cross { stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 3 3; pointer-events: none; }
.tr-tip { position: absolute; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-lg); border-radius: 10px; padding: 8px 12px; font-size: 13px; pointer-events: none; min-width: 150px; max-width: 240px; line-height: 1.5; }
.tr-tip small { color: var(--ink-3); }
.mod-perf { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 12px 28px; }
.mp-row { display: grid; grid-template-columns: 1fr auto; grid-template-areas: "n v" "b b"; gap: 6px 10px; align-items: center; }
.mp-row .mp-name { grid-area: n; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mp-row .mp-bar { grid-area: b; }
.mp-row .mp-val { grid-area: v; gap: 8px; }
.mp-name { font-size: 13.5px; }
.mp-bar { position: relative; height: 10px; background: var(--line); border-radius: 9px; }
.mp-bar i { display: block; height: 100%; border-radius: 9px; }
.mp-pass { position: absolute; top: -3px; bottom: -3px; width: 2px; background: var(--ink-2); opacity: .5; }
.mp-val { display: flex; justify-content: space-between; align-items: center; font-size: 13px; }
.hist-tbl td, .hist-tbl th { white-space: nowrap; }
.hist-tbl td:nth-child(3) { white-space: normal; min-width: 180px; }
.pct-cell { display: flex; align-items: center; gap: 8px; min-width: 120px; }
.pct-cell .mini-bar { flex: 1; min-width: 60px; }
.prac-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.prac-item { display: flex; gap: 12px; align-items: center; padding: 12px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink); transition: box-shadow .2s, transform .2s; }
.prac-item:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.prac-item .s-ic { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; font-size: 18px; flex: none; }
.prac-item .pi-t { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 5px; font-size: 13px; }
.prac-item .pi-t b { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.prac-item small { color: var(--ink-3); font-size: 11.5px; }
@media (max-width: 1200px) { .dash-stats { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 720px) { .mod-perf { grid-template-columns: 1fr; } }
@media (max-width: 720px) {
  .dash-hero { padding: 22px 18px; text-align: center; justify-content: center; }
  .d-meta { justify-content: center; }
  .d-acts { width: 100%; } .d-acts .btn { flex: 1 1 45%; }
  .d-info h1 { font-size: 23px; }
  .dash-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .dash-stats .stat { flex-direction: row; text-align: left; padding: 12px; }
  .dash-stats .stat .ic { width: 40px; height: 40px; font-size: 16px; }
  .dash-stats .stat b { font-size: 20px; }
}
@media (max-width: 720px) {
  .hist-tbl thead { display: none; }
  .hist-tbl, .hist-tbl tbody { display: block; }
  .hist-tbl tr { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 14px; border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin-bottom: 12px; position: relative; }
  .hist-tbl td { border: 0; padding: 0; white-space: normal; font-size: 13.5px; }
  .hist-tbl td[data-label] { display: flex; justify-content: space-between; gap: 8px; }
  .hist-tbl td[data-label]::before { content: attr(data-label); color: var(--ink-3); font-size: 12px; font-weight: 400; }
  .hist-tbl td.h-no { display: none; }
  .hist-tbl td.h-title { grid-column: 1 / -1; font-weight: 700; font-size: 15px; min-width: 0; padding-right: 80px; }
  .hist-tbl td.h-date { grid-column: 1 / -1; color: var(--ink-3); font-size: 12.5px; margin-top: -4px; }
  .hist-tbl td.h-st { position: absolute; top: 14px; right: 14px; }
  .hist-tbl td[data-label]:nth-child(9) { grid-column: 1 / -1; }
  .hist-tbl td.h-view { grid-column: 1 / -1; }
  .hist-tbl td.h-view .btn { width: 100%; }
  .table-wrap:has(.hist-tbl) { overflow: visible; }
}

/* ---------- Module images ---------- */
.module-card { padding: 0 0 20px; overflow: hidden; }
.module-card > :not(.mc-img) { margin-left: 20px; margin-right: 20px; }
.mc-img { display: block; position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg); }
.mc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.module-card:hover .mc-img img { transform: scale(1.05); }
.mc-no { position: absolute; left: 12px; top: 12px; background: rgba(7,21,56,.8); color: #fff; font: 600 12px var(--font-head); padding: 4px 10px; border-radius: 999px; }
.module-hero { position: relative; overflow: hidden; }
.m-shot { width: 260px; height: auto; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 12px; border: 3px solid rgba(255,255,255,.35); box-shadow: 0 12px 28px rgba(0,0,0,.35); margin-left: auto; }
.module-hero .m-stats { margin-left: 0; }
@media (max-width: 1100px) { .m-shot { display: none; } .module-hero .m-stats { margin-left: auto; } }
@media (max-width: 720px) { .module-hero .m-stats { margin-left: 0; } }

/* ---------- Answer explanation ---------- */
.explain { display: flex; gap: 12px; align-items: flex-start; margin-top: 12px; padding: 13px 16px; border-radius: 12px; background: #fff8e6; border: 1px solid #ffe3a3; border-left: 4px solid var(--yellow-600); color: #5b4300; font-size: 14.5px; line-height: 1.6; }
.explain > i { color: var(--yellow-600); font-size: 17px; margin-top: 3px; }
.explain b { color: #3d2c00; font-family: var(--font-head); font-weight: 600; }
.study-item .explain { margin-top: 10px; font-size: 13.5px; padding: 10px 14px; }
.review-item .explain { font-size: 13.5px; }

/* ---------- Study notes ---------- */
.notes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin-bottom: 26px; }
.note-card { padding: 18px 20px; display: flex; flex-direction: column; gap: 10px; border-top: 4px solid var(--purple); }
.nc-head { display: flex; gap: 10px; align-items: center; }
.nc-head h3 { margin: 0; font-size: 16.5px; }
.nc-body { color: var(--ink-2); font-size: 14.5px; line-height: 1.7; }
.nc-body a { word-break: break-all; }
.note-card .btn { align-self: flex-start; }

/* ---------- Ad slots ---------- */
.ad-slot { margin: 20px 0; text-align: center; }
.ad-slot:not(.on) { display: none; }
.ad-label { display: block; font-size: 11px; color: var(--ink-3); letter-spacing: .5px; text-transform: uppercase; margin-bottom: 4px; }

/* ---------- Footer (developer credit + links) ---------- */
.site-footer .f-copy { line-height: 1.7; }
.site-footer .f-dev { color: #c7d2ee; font-size: 13px; }
.site-footer .f-dev b { color: var(--yellow); }
.f-links { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13.5px; }
.f-links a { color: #c7d2ee; }
.f-links a:hover { color: #fff; }

/* ---------- Legal pages ---------- */
.legal { max-width: 900px; }
.legal h1 { font-size: 30px; margin-bottom: 4px; }
.legal .upd { color: var(--ink-3); font-size: 13px; margin: 0 0 16px; }
.legal h2 { font-size: 18px; margin: 22px 0 8px; }
.legal p, .legal li { color: var(--ink-2); line-height: 1.75; font-size: 15px; }
.legal ul { padding-left: 20px; }

/* ---------- Dashboard: saved live practicals ---------- */
.prog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.prog-card { border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: #fff; display: flex; flex-direction: column; transition: box-shadow .2s, transform .2s; }
.prog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.pc-out { height: 170px; position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.pc-out.web { background: #fff; }
.pc-out.web iframe { width: 200%; height: 340px; border: 0; transform: scale(.5); transform-origin: 0 0; pointer-events: none; }
.pc-out.py { background: #0d1326; }
.pc-out pre { margin: 0; padding: 12px 14px; font: 12.5px/1.55 Consolas, monospace; color: #e6edff; white-space: pre-wrap; word-break: break-word; height: 100%; overflow: hidden; }
.pc-out .cl.err { color: #ff7b7b; } .pc-out .cl.in { color: #c3a6ff; } .pc-out .cl.ok { color: #3ddc84; } .pc-out .cl.info { color: #7fa8ff; } .pc-out .cl.explain { color: #ffd166; }
.pc-bd { padding: 12px 14px 14px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.pc-bd h4 { margin: 0; font-size: 15px; }
.pc-bd small { color: var(--ink-3); font-size: 12px; }
.pc-bd .btn { align-self: flex-start; margin-top: auto; }
.pc-lang { align-self: flex-start; font: 600 11px var(--font-head); padding: 3px 9px; border-radius: 999px; }
.pc-lang.web { background: #fdeae4; color: #e44d26; }
.pc-lang.py { background: #e5eef7; color: #3572a5; }

.brand-text .b2, .brand-text .b1 { white-space: nowrap; }

/* menu collapses to the ☰ drop-down only when it really does not fit (measured in app.js) */
.site-header.collapsed .main-nav { display: none; }
.site-header.collapsed .menu-toggle { display: grid; place-items: center; }
.site-header.collapsed .header-actions { margin-left: auto; }
.site-header.collapsed .top-drop { display: flex; }
body.nav-open .site-header.collapsed .top-drop { transform: none; opacity: 1; visibility: visible; }
body.nav-open .site-header.collapsed ~ .sidebar-backdrop { display: block; position: fixed; inset: var(--header-h) 0 0 0; background: rgba(7,21,56,.45); z-index: 55; }
@media (max-width: 1500px) {
  .site-header { gap: 12px; padding: 0 16px; }
  .main-nav { gap: 2px; }
  .main-nav a { padding: 8px 10px; font-size: 13.5px; gap: 6px; }
  .brand-text .b3 { display: none; }
}
@media (max-width: 1240px) {
  .main-nav a { padding: 8px 8px; font-size: 13px; gap: 5px; }
  .brand-text .b2 { font-size: 22px; }
  .lang-select { padding: 7px 26px 7px 11px; font-size: 13px; }
  .btn-login { padding: 8px 14px; font-size: 13.5px; }
}
@media (max-width: 720px) {
  .site-header { padding: 0 12px; gap: 8px; }
}
.cbt-top .cbt-logo { height: 38px; width: auto; flex: none; filter: drop-shadow(0 2px 4px rgba(0,0,0,.35)); }
@media (max-width: 400px) { .brand { gap: 8px; } .brand-logo { height: 32px; } }
@media (max-width: 380px) {
  .site-header { padding: 0 8px; gap: 6px; }
  .brand { gap: 6px; } .brand-logo { height: 28px; }
  .brand-text .b2 { font-size: 17px; }
  .header-actions { gap: 6px; }
}

/* crawlable question list on module pages */
.seo-qa { margin-top: 26px; margin-bottom: 30px; }
.seo-qa details { background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow-sm, 0 4px 14px rgba(15,35,95,.06)); }
.seo-qa summary { cursor: pointer; padding: 16px 20px; list-style: none; display: flex; align-items: center; gap: 10px; }
.seo-qa summary::-webkit-details-marker { display: none; }
.seo-qa summary::before { content: "\f0ca"; font-family: "Font Awesome 6 Free"; font-weight: 900; color: var(--blue-600); }
.seo-qa summary h2 { font-size: 16px; margin: 0; }
.seo-qa ol { margin: 0; padding: 4px 24px 18px 44px; display: grid; gap: 10px; }
.seo-qa li p { margin: 0; line-height: 1.6; }
.seo-qa .sq { font-weight: 600; color: var(--ink); }
.seo-qa .sa { font-size: 14px; color: #157347; }
.seo-qa .sa span { color: var(--ink-3); }

/* ---------- formatted study material (Word-style notes) ---------- */
.rte-content { font-family: var(--font-body, Roboto, sans-serif); font-size: 15px; line-height: 1.65; color: var(--ink); overflow-wrap: break-word; }
.rte-content > :first-child { margin-top: 0; }
.rte-content p { margin: 0 0 .6em; }
.rte-content h1 { font-size: 1.8em; margin: .6em 0 .35em; line-height: 1.25; }
.rte-content h2 { font-size: 1.45em; margin: .6em 0 .35em; line-height: 1.3; }
.rte-content h3 { font-size: 1.2em; margin: .6em 0 .3em; }
.rte-content h4 { font-size: 1.05em; margin: .6em 0 .3em; }
.rte-content ul, .rte-content ol { margin: 0 0 .7em; padding-left: 1.6em; }
.rte-content li { margin: .15em 0; }
.rte-content blockquote { margin: .6em 0; padding: .5em 1em; border-left: 4px solid var(--purple, #7c5cff); background: #f6f3ff; border-radius: 0 10px 10px 0; color: var(--ink-2); }
.rte-content pre { background: #0f1630; color: #e6edff; padding: 12px 14px; border-radius: 10px; overflow-x: auto; font: 13.5px/1.55 "JetBrains Mono", Consolas, monospace; white-space: pre-wrap; }
.rte-content code { background: #eef2ff; border-radius: 5px; padding: 1px 5px; font-family: Consolas, monospace; }
.rte-content pre code { background: none; padding: 0; }
.rte-content a { color: var(--blue-600, #1a56db); text-decoration: underline; }
.rte-content img { max-width: 100%; height: auto; border-radius: 8px; }
.rte-content hr { border: 0; border-top: 2px solid var(--line, #e3e8f4); margin: 1em 0; }
.rte-content table { border-collapse: collapse; width: 100%; margin: .6em 0 1em; font-size: .95em; display: table; }
.rte-content th, .rte-content td { border: 1px solid #c9d3ea; padding: 7px 10px; vertical-align: top; text-align: left; min-width: 40px; }
.rte-content th { background: #eef3ff; font-weight: 700; }
.rte-content tr:nth-child(even) td { background-color: #fafbff; }
.rte-content .rte-tscroll, .nc-body.rich { overflow-x: auto; }
.nc-body.rich { max-height: 230px; overflow: hidden; position: relative; font-size: 14px; }
.nc-body.rich::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 70px; background: linear-gradient(transparent, #fff); pointer-events: none; }
.nc-body.rich table { font-size: 12.5px; }
.note-card .nc-read { align-self: flex-start; }
.modal.note-modal { max-width: 920px; padding: 22px 22px 26px; background: #eef1f8; }
.note-view .nv-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 0 40px 14px 0; }
.note-view .nv-head h2 { margin: 0; font-size: 21px; flex: 1; min-width: 200px; }
.rte-page { background: #fff; border-radius: 6px; box-shadow: 0 6px 24px rgba(15,35,95,.12); border: 1px solid #e3e8f4; padding: 32px 40px; min-height: 200px; }
.rte-page[data-margin="narrow"] { padding: 18px 20px; }
.rte-page[data-margin="wide"] { padding: 48px 72px; }
@media (max-width: 720px) { .rte-page, .rte-page[data-margin] { padding: 18px 16px; } .modal.note-modal { padding: 16px 10px 20px; } .rte-content table { display: block; overflow-x: auto; } }
@media print { .rte-content tr:nth-child(even) td { background-color: transparent; } }