@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&family=Noto+Sans+Devanagari:wght@400;600&display=swap');

:root {
  --bg: #f3f5fb; --card: #fff; --ink: #1d2340; --muted: #6b7290; --line: #e3e7f2;
  --pri: #4f46e5; --pri2: #6366f1; --ok: #16a34a; --okbg: #e9f9ef; --bad: #dc2626; --badbg: #fdecec;
  --easy: #16a34a; --medium: #d97706; --hard: #dc2626;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font-family: 'Poppins', 'Noto Sans Devanagari', system-ui, sans-serif; line-height: 1.5; }
a { color: var(--pri); }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.center { text-align: center; }
.left { text-align: left; }

.top { display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 14px 20px; background: linear-gradient(90deg, var(--pri), #7c3aed); color: #fff; }
.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.lang-switch { display: flex; background: rgba(255,255,255,.18); border-radius: 999px; padding: 3px; }
.lang-switch a { color: #fff; text-decoration: none; padding: 5px 14px; border-radius: 999px; font-size: .9rem; }
.lang-switch a.on { background: #fff; color: var(--pri); font-weight: 600; }

.wrap { max-width: 860px; margin: 24px auto; padding: 0 16px; }
.card { background: var(--card); border-radius: 16px; padding: 24px; margin-bottom: 20px;
  box-shadow: 0 4px 20px rgba(30,40,90,.06); border: 1px solid var(--line); }
.narrow { max-width: 380px; margin: 40px auto; }
.hero h1 { margin: 0 0 4px; }
.foot { text-align: center; color: var(--muted); font-size: .85rem; padding: 20px; }

.grid-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.grid-form .full { grid-column: 1 / -1; }
label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: .9rem; }
select, input, textarea { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px;
  background: #fff; color: var(--ink); width: 100%; }
select:disabled { background: #f6f7fb; color: #aaa; }
textarea { min-height: 70px; resize: vertical; }
fieldset { border: none; padding: 0; margin: 0; }
legend { font-weight: 600; font-size: .9rem; margin-bottom: 8px; }
.pills { display: flex; gap: 10px; flex-wrap: wrap; }
.pill { flex-direction: row; cursor: pointer; }
.pill input { display: none; }
.pill span { padding: 8px 18px; border-radius: 999px; border: 2px solid var(--line); font-weight: 600; }
.pill input:checked + span { background: var(--pri); border-color: var(--pri); color: #fff; }
.pill-easy input:checked + span { background: var(--easy); border-color: var(--easy); }
.pill-medium input:checked + span { background: var(--medium); border-color: var(--medium); }
.pill-hard input:checked + span { background: var(--hard); border-color: var(--hard); }

.btn { display: inline-block; font: inherit; font-weight: 600; padding: 10px 20px; border-radius: 10px;
  border: 1px solid var(--line); background: #fff; color: var(--ink); cursor: pointer; text-decoration: none; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--pri); border-color: var(--pri); color: #fff; }
.btn.primary:hover { background: var(--pri2); }
.btn.small { padding: 4px 10px; font-size: .8rem; }
.btn.danger { color: var(--bad); border-color: #f3c4c4; }

.progress { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin-bottom: 14px; }
.bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--pri), #7c3aed); transition: width .3s; }
.qmeta { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; color: var(--muted); font-size: .85rem; }
.qtext { font-size: 1.3rem; margin: 14px 0 18px; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: .75rem; font-weight: 600; color: #fff; margin-left: 6px; }
.badge.easy { background: var(--easy); } .badge.medium { background: var(--medium); } .badge.hard { background: var(--hard); }

.options { display: grid; gap: 10px; }
.opt { display: flex; align-items: center; gap: 12px; text-align: left; font: inherit; padding: 12px 14px;
  border: 2px solid var(--line); border-radius: 12px; background: #fff; cursor: pointer; color: var(--ink); transition: .15s; }
.opt:hover:not(:disabled) { border-color: var(--pri); background: #f5f5ff; }
.opt .letter { flex: none; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  background: var(--bg); font-weight: 700; }
.opt.right { border-color: var(--ok); background: var(--okbg); }
.opt.right .letter { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--badbg); }
.opt.wrong .letter { background: var(--bad); color: #fff; }
.opt:disabled { cursor: default; }

.feedback { display: none; margin-top: 16px; padding: 12px 14px; border-radius: 12px; }
.feedback.show { display: block; }
.feedback.ok { background: var(--okbg); color: #14532d; }
.feedback.bad { background: var(--badbg); color: #7f1d1d; }
.exp { margin-top: 6px; font-size: .92rem; color: var(--ink); }
.nav { display: flex; justify-content: space-between; margin-top: 22px; }

.score { font-size: 3rem; font-weight: 700; margin: 10px 0 18px; }
.score small { display: block; font-size: 1.1rem; color: var(--muted); }
.score.good { color: var(--ok); } .score.mid { color: var(--medium); } .score.low { color: var(--bad); }
.actions { display: flex; gap: 10px; justify-content: center; margin-bottom: 20px; }
.rev { border-left: 4px solid; padding: 10px 14px; margin: 10px 0; border-radius: 8px; background: var(--bg); font-size: .92rem; }
.rev.ok { border-color: var(--ok); } .rev.bad { border-color: var(--bad); }

.stack { display: flex; flex-direction: column; gap: 10px; }
.alert { background: #eef2ff; border: 1px solid #c7d2fe; padding: 10px 14px; border-radius: 10px; }
.admin-head { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.admin-head h1 { margin: 0; flex: 1; }
.cols3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cols3 .card { margin-bottom: 0; } .cols3 { margin-bottom: 20px; }
.cols3 h3 { margin: 0; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 12px 0; align-items: end; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { padding: 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { background: var(--bg); }

@media (max-width: 700px) {
  .grid-form, .row2, .cols3 { grid-template-columns: 1fr; }
  .qtext { font-size: 1.1rem; }
  .card { padding: 18px; }
}

/* ---------- Home page ---------- */
.menu { display: flex; gap: 16px; align-items: center; margin-left: auto; flex-wrap: wrap; justify-content: flex-end; }
.menu a.active { text-decoration: underline; text-underline-offset: 5px; opacity: 1; }
.who { color: #fff; font-size: .85rem; background: rgba(255,255,255,.15); padding: 4px 10px; border-radius: 99px; }
.who small { opacity: .8; text-transform: capitalize; }
.burger { display: none; color: #fff; font-size: 1.5rem; cursor: pointer; margin-left: auto; }
.menu a { color: #fff; text-decoration: none; font-weight: 600; font-size: .92rem; opacity: .9; }
.menu a:hover { opacity: 1; text-decoration: underline; }
.home-hero { text-align: center; color: #fff; border-radius: 22px; padding: 56px 24px 40px; margin-bottom: 28px;
  background: radial-gradient(circle at 20% 10%, #818cf8 0, transparent 45%), linear-gradient(135deg, #4f46e5, #7c3aed); }
.home-hero h1 { font-size: 2.3rem; margin: 0 0 10px; line-height: 1.25; }
.home-hero p { font-size: 1.08rem; opacity: .92; max-width: 560px; margin: 0 auto 26px; }
.btn.big { padding: 14px 32px; font-size: 1.05rem; border-radius: 12px; }
.home-hero .btn.big { background: #fff; color: var(--pri); border: none; box-shadow: 0 6px 20px rgba(0,0,0,.18); }
.stats { display: flex; justify-content: center; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.stats div { background: rgba(255,255,255,.15); border-radius: 14px; padding: 12px 22px; min-width: 110px; }
.stats b { display: block; font-size: 1.6rem; }
.stats span { font-size: .85rem; opacity: .9; }
.sec-title { margin: 30px 0 14px; font-size: 1.35rem; }
.grade-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
.grade-card { display: flex; flex-direction: column; gap: 4px; padding: 20px; border-radius: 16px; text-decoration: none;
  background: #fff; border: 1px solid var(--line); color: var(--ink); box-shadow: 0 4px 14px rgba(30,40,90,.05); transition: .15s; }
.grade-card:hover { transform: translateY(-3px); border-color: var(--pri); }
.g-name { font-weight: 700; font-size: 1.1rem; }
.g-count { color: var(--muted); font-size: .85rem; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.step { margin: 0; text-align: center; }
.step .ic { font-size: 2rem; margin-bottom: 6px; }
.step p { margin: 6px 0 0; font-size: .9rem; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 20px; }
.features > div { display: flex; gap: 12px; align-items: flex-start; }
.features .ic { font-size: 1.6rem; }
.features p { margin: 2px 0 0; font-size: .88rem; }
@media (max-width: 860px) {
  .top { flex-wrap: wrap; }
  .burger { display: block; }
  .menu { display: none; width: 100%; flex-direction: column; align-items: flex-start; gap: 12px; padding: 12px 0 4px; }
  #navToggle:checked ~ .menu { display: flex; }
}
@media (max-width: 700px) {
  .home-hero h1 { font-size: 1.6rem; }
  .steps, .features { grid-template-columns: 1fr; }
}

/* ---------- v2: login / exam records ---------- */
.alert.bad { background: var(--badbg); border-color: #f5b5b5; color: #7f1d1d; }
.exam-head { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; font-weight: 600; }
.dots { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); }
.dot { width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--line); background: #fff; font: inherit; font-size: .8rem; cursor: pointer; }
.dot.ok { background: var(--okbg); border-color: var(--ok); color: var(--ok); font-weight: 700; }
.dot.bad { background: var(--badbg); border-color: var(--bad); color: var(--bad); font-weight: 700; }
.dot.cur { outline: 2px solid var(--pri); outline-offset: 1px; }
.rev-opts { margin: 8px 0 4px; padding-left: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; }
.rev-opts li { padding: 4px 8px; border-radius: 6px; }
.rev-opts li.right { background: var(--okbg); color: #14532d; font-weight: 600; }
.rev-opts li.wrong { background: var(--badbg); color: #7f1d1d; text-decoration: line-through; }
.stat-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 20px; }
.stat-cards .card { margin: 0; padding: 18px; }
.stat-cards span { display: block; color: var(--muted); font-size: .85rem; }
.stat-cards b { font-size: 1.8rem; }
.filter-bar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; padding: 16px; }
.filter-bar select { width: auto; flex: 1; min-width: 180px; }
.pct.good { color: var(--ok); } .pct.mid { color: var(--medium); } .pct.low { color: var(--bad); }
.row4 { display: grid; grid-template-columns: 1.3fr 1fr 1fr .8fr auto; gap: 10px; }
form.inline { display: flex; gap: 6px; align-items: center; margin: 0; }
.small-input { width: 130px; padding: 6px 8px; font-size: .85rem; }
td select { padding: 6px 8px; font-size: .85rem; width: auto; }
tr.disabled td { opacity: .55; }
.chip { padding: 5px 14px; border-radius: 99px; border: 1px solid var(--line); background: #fff; text-decoration: none; color: var(--ink); font-size: .85rem; font-weight: 600; }
.chip.on { background: var(--pri); color: #fff; border-color: var(--pri); }
.small-text { font-size: .82rem; margin: 10px 0 0; }
@media (max-width: 700px) {
  .stat-cards, .row4, .rev-opts { grid-template-columns: 1fr; }
}

/* ---------- v3: boards ---------- */
details.card > summary { cursor: pointer; list-style: none; }
details.card > summary::-webkit-details-marker { display: none; }
details.card > summary::before { content: '▸ '; }
details.card[open] > summary::before { content: '▾ '; }
.cols4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 16px; }
.cols4 h3 { margin: 0; }
.row4q { display: grid; grid-template-columns: .8fr .8fr 1fr 1.6fr .7fr; gap: 10px; margin: 12px 0; }
.board-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.board-tabs button { font: inherit; font-weight: 600; padding: 8px 18px; border-radius: 99px; border: 2px solid var(--line); background: #fff; cursor: pointer; color: var(--ink); }
.board-tabs button.on { background: var(--pri); border-color: var(--pri); color: #fff; }
.g-subj { color: var(--muted); font-size: .78rem; }
@media (max-width: 860px) { .cols4, .row4q { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .cols4, .row4q { grid-template-columns: 1fr; } }
.grade-grid[hidden] { display: none; }
.en-only { font-size: .7rem; font-weight: 600; opacity: .75; }
.check { flex-direction: row; align-items: center; gap: 8px; font-weight: 400; }
.check input { width: auto; }
#hindiBox[hidden] { display: none; }
.row2:has(#hindiBox[hidden]) { grid-template-columns: 1fr; }
.board-tabs a { font-weight: 600; padding: 8px 20px; border-radius: 99px; border: 2px solid var(--line); background: #fff; color: var(--ink); text-decoration: none; }
.board-tabs a.on { background: var(--pri); border-color: var(--pri); color: #fff; }