:root {
  --ink: #15171c; --ink-2: #4b5160; --muted: #626a7c; --line: #e6e8ef; --line-2: #d9dce6;
  --canvas: #f4f5f9; --card: #ffffff; --side: #1b1b1f; --side-ink: #a9adb8; --side-hi: #26262c;
  --blue: #2f6fed; --blue-ink: #1d4ed8; --blue-soft: #e6eeff;
  --lav: #ede9fe; --lav-ink: #6d28d9; --lav-mid: #c4b5fd;
  --mint: #d8f5e8; --mint-ink: #047857; --mint-mid: #6ee7b7;
  --lime: #e9f8c7; --lime-ink: #4d7c0f; --lime-mid: #bef264;
  --peach: #ffe6d5; --peach-ink: #c2410c; --peach-mid: #fdba74;
  --rose: #fde2e4; --rose-ink: #be123c;
  --r: 14px; --r-sm: 10px;
  --shadow: 0 1px 2px rgba(21,23,28,.04), 0 8px 24px -12px rgba(21,23,28,.12);
  --ease: cubic-bezier(.2,.8,.2,1);
  --font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--canvas); color: var(--ink); font: 15px/1.5 var(--font); font-feature-settings: "ss01", "cv11"; -webkit-font-smoothing: antialiased; }
::selection { background: var(--lav-mid); color: var(--ink); }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 6px; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
h1, h2, h3 { margin: 0; letter-spacing: -0.015em; text-wrap: balance; }
h1 { font-size: 26px; font-weight: 700; }
h2 { font-size: 18px; font-weight: 700; }
h3 { font-size: 15px; font-weight: 600; }
p { margin: 0; }
.num { font-variant-numeric: tabular-nums; }
::-webkit-scrollbar { width: 10px; height: 10px; } ::-webkit-scrollbar-thumb { background: var(--line-2); border: 3px solid var(--canvas); border-radius: 8px; } ::-webkit-scrollbar-track { background: transparent; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 232px minmax(0, 1fr) 320px; min-height: 100vh; }
.side { background: var(--side); color: var(--side-ink); padding: 20px 14px; display: flex; flex-direction: column; gap: 18px; position: sticky; top: 0; height: 100vh; }
.who { display: flex; gap: 10px; align-items: center; padding: 10px; background: var(--side-hi); border-radius: var(--r-sm); }
.avatar { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, var(--lav-mid), var(--mint-mid)); color: var(--ink); font-weight: 800; display: grid; place-items: center; font-size: 15px; }
.who-name { color: #fff; font-weight: 600; font-size: 14px; line-height: 1.2; }
.who-sub { font-size: 12px; color: var(--side-ink); }
.nav { display: flex; flex-direction: column; gap: 2px; }
.nav a { display: flex; align-items: center; gap: 12px; white-space: nowrap; padding: 10px 12px; border-radius: var(--r-sm); font-weight: 500; font-size: 14px; color: var(--side-ink); transition: background .18s var(--ease), color .18s var(--ease); }
.nav a svg { width: 18px; height: 18px; }
.nav a:hover { color: #fff; background: var(--side-hi); }
.nav a.on { color: #fff; background: var(--side-hi); }
.side-foot { margin-top: auto; }
.streak { display: flex; gap: 10px; align-items: center; font-size: 13px; color: var(--side-ink); padding: 10px 12px; }
.streak svg { color: var(--peach-mid); }
.streak.lit { color: #fff; }

.main { padding: 22px 28px 48px; min-width: 0; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.search { display: flex; align-items: center; gap: 8px; background: #eceef4; border-radius: 999px; padding: 8px 14px; color: var(--muted); width: 260px; max-width: 40vw; }
.search input { border: 0; background: transparent; outline: 0; width: 100%; color: var(--ink); } .search input::placeholder { color: var(--muted); }
.rail { padding: 22px 22px 48px 0; display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.rail h2 { font-size: 16px; }

/* ---------- primitives ---------- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 20px; box-shadow: var(--shadow); }
.card.tight { padding: 14px 16px; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.row { display: flex; align-items: center; gap: 10px; }
.row.between { justify-content: space-between; }
.wrap { flex-wrap: wrap; }
.grow { flex: 1; min-width: 0; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.muted { color: var(--muted); font-size: 13px; }
.small { font-size: 13px; }
.sec { margin: 26px 0 12px; display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.sec:first-child { margin-top: 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--card); font-weight: 600; font-size: 14px; transition: transform .14s var(--ease), background .14s var(--ease), border-color .14s var(--ease); white-space: nowrap; }
.btn:hover { border-color: var(--ink-2); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.primary:hover { background: #000; }
.btn.accent { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn.accent:hover { background: var(--blue-ink); }
.btn.ghost { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: var(--line); color: var(--ink); }
.btn.sm { padding: 6px 10px; font-size: 13px; }
.btn.block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; line-height: 1.5; background: var(--line); color: var(--ink-2); white-space: nowrap; }
.pill.lav { background: var(--lav); color: var(--lav-ink); } .pill.mint { background: var(--mint); color: var(--mint-ink); }
.pill.lime { background: var(--lime); color: var(--lime-ink); } .pill.peach { background: var(--peach); color: var(--peach-ink); }
.pill.blue { background: var(--blue-soft); color: var(--blue-ink); } .pill.rose { background: var(--rose); color: var(--rose-ink); }
.score { display: grid; place-items: center; min-width: 44px; height: 44px; padding: 0 8px; border-radius: 12px; font-weight: 800; font-size: 16px; }
.score.good { background: var(--mint); color: var(--mint-ink); } .score.ok { background: var(--peach); color: var(--peach-ink); } .score.low { background: var(--rose); color: var(--rose-ink); } .score.none { background: var(--line); color: var(--muted); }
.bar { height: 6px; background: var(--line); border-radius: 999px; overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 999px; background: var(--lav-mid); }
.bar.mint > i { background: var(--mint-mid); } .bar.lime > i { background: var(--lime-mid); } .bar.peach > i { background: var(--peach-mid); } .bar.blue > i { background: var(--blue); }
.field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 600; color: var(--ink-2); }
.field input, .field select, .field textarea { font-weight: 400; font-size: 14px; color: var(--ink); padding: 9px 12px; border: 1px solid var(--line-2); border-radius: 10px; background: #fff; }
.field input:focus, .field textarea:focus, .field select:focus { outline: 0; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.field textarea { min-height: 80px; resize: vertical; }
.check { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-weight: 500; cursor: pointer; }
.check input { width: 17px; height: 17px; accent-color: var(--ink); }
.empty { text-align: center; padding: 40px 20px; color: var(--muted); }
.empty h3 { color: var(--ink); margin-bottom: 6px; }
.icon-btn { width: 34px; height: 34px; border-radius: 10px; border: 1px solid var(--line-2); background: #fff; display: grid; place-items: center; color: var(--ink-2); } .icon-btn:hover { color: var(--ink); border-color: var(--ink-2); }
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.tabs button { background: none; border: 0; padding: 10px 14px; font-weight: 600; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; transition: color .14s; }
.tabs button:hover { color: var(--ink); } .tabs button.on { color: var(--ink); border-color: var(--ink); }
.kbd { font-size: 11px; font-weight: 700; padding: 1px 6px; border-radius: 5px; background: var(--line); color: var(--ink-2); }

/* ---------- overview ---------- */
.topic-card { display: grid; grid-template-columns: 56px 1fr; gap: 16px; cursor: pointer; transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease); }
.topic-card:hover { transform: translateY(-2px); box-shadow: 0 2px 4px rgba(21,23,28,.04), 0 16px 32px -14px rgba(21,23,28,.18); border-color: var(--line-2); }
.glyph { width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; font-weight: 800; font-size: 18px; letter-spacing: -0.02em; }
.glyph.lav { background: var(--lav); color: var(--lav-ink); } .glyph.mint { background: var(--mint); color: var(--mint-ink); } .glyph.lime { background: var(--lime); color: var(--lime-ink); } .glyph.peach { background: var(--peach); color: var(--peach-ink); } .glyph.blue { background: var(--blue-soft); color: var(--blue-ink); }
.topic-card h3 { font-size: 16px; }
.topic-card .meta { color: var(--muted); font-size: 13px; margin: 2px 0 10px; }
.topic-card .foot { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-top: 6px; }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat { padding: 14px 16px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); }
.stat b { display: block; font-size: 24px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.stat span { color: var(--muted); font-size: 12px; }
.list { display: flex; flex-direction: column; }
.list > * { padding: 11px 0; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 12px; }
.list > *:first-child { border-top: 0; padding-top: 0; } .list > *:last-child { padding-bottom: 0; }
.list .grow b { display: block; font-weight: 600; font-size: 14px; line-height: 1.3; }
.list .grow span { color: var(--muted); font-size: 12px; }
.rail-link { display: flex; align-items: center; gap: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; font-weight: 600; font-size: 14px; transition: border-color .14s; }
.rail-link:hover { border-color: var(--ink-2); } .rail-link svg:last-child { margin-left: auto; color: var(--muted); }
.rail-link .mini { width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; background: var(--canvas); color: var(--ink-2); }

/* ---------- recap ---------- */
.recap { max-width: 72ch; }
.recap h1 { font-size: 24px; margin: 0 0 14px; } .recap h2 { font-size: 18px; margin: 26px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--line); } .recap h3 { font-size: 15px; margin: 18px 0 8px; }
.recap p, .recap li { line-height: 1.6; } .recap p { margin: 0 0 10px; } .recap ul, .recap ol { padding-left: 22px; margin: 0 0 12px; } .recap li { margin: 4px 0; }
.recap table { border-collapse: collapse; width: 100%; margin: 10px 0 16px; font-size: 14px; }
.recap th, .recap td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.recap th { background: var(--canvas); font-weight: 700; font-size: 13px; }
.recap tr:last-child td { border-bottom: 0; }
.recap hr { border: 0; border-top: 1px solid var(--line); margin: 22px 0; }
.recap strong { font-weight: 700; } .recap em { color: var(--ink-2); }
.recap code { background: var(--canvas); padding: 1px 5px; border-radius: 5px; font-size: 13px; }

/* ---------- practice ---------- */
.quiz { max-width: 720px; margin: 0 auto; }
.quiz .q { font-size: 21px; font-weight: 700; line-height: 1.35; margin: 6px 0 18px; letter-spacing: -0.01em; }
.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { display: flex; align-items: center; gap: 12px; text-align: left; width: 100%; padding: 12px 14px; border: 1px solid var(--line-2); border-radius: 12px; background: #fff; font-size: 15px; font-weight: 500; transition: border-color .14s, background .14s, transform .14s var(--ease); }
.opt:hover:not([disabled]) { border-color: var(--ink); background: var(--canvas); }
.opt:active:not([disabled]) { transform: scale(.995); }
.opt .key { width: 24px; height: 24px; border-radius: 7px; display: grid; place-items: center; font-size: 12px; font-weight: 700; background: var(--canvas); color: var(--ink-2); flex: none; }
.opt[disabled] { cursor: default; }
.opt.right { border-color: var(--mint-mid); background: var(--mint); } .opt.right .key { background: var(--mint-mid); color: var(--mint-ink); }
.opt.wrong { border-color: #fda4af; background: var(--rose); } .opt.wrong .key { background: #fda4af; color: var(--rose-ink); }
.fb { margin-top: 16px; padding: 14px 16px; border-radius: 12px; background: var(--canvas); border: 1px solid var(--line); animation: rise .28s var(--ease); }
.fb.ok { background: var(--mint); border-color: transparent; color: var(--mint-ink); } .fb.bad { background: var(--rose); border-color: transparent; color: var(--rose-ink); }
.fb b { display: block; margin-bottom: 2px; }
.fb .why { color: var(--ink-2); margin-top: 4px; }
.type input { width: 100%; padding: 12px 14px; border: 1px solid var(--line-2); border-radius: 12px; font-size: 16px; }
.type input:focus { outline: 0; border-color: var(--ink); }
.hint { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .25em; color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.reveal { background: var(--canvas); border-radius: 12px; padding: 14px 16px; margin-top: 12px; line-height: 1.55; animation: rise .28s var(--ease); }
.result-big { font-size: 48px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; }
.ring { position: relative; width: 120px; height: 120px; display: grid; place-items: center; }
.ring svg { position: absolute; inset: 0; width: 120px; height: 120px; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 10; stroke-linecap: round; }
.ring .tr { stroke: var(--line); } .ring .pr { stroke: var(--mint-mid); transition: stroke-dashoffset 1s var(--ease); }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.qhead { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.qprog { height: 6px; background: var(--line); border-radius: 999px; overflow: hidden; margin-bottom: 18px; } .qprog i { display: block; height: 100%; background: var(--ink); }

/* ---------- bank ---------- */
.bank-item { padding: 12px 0; border-top: 1px solid var(--line); }
.bank-item:first-child { border-top: 0; }
.bank-item b { font-weight: 600; }
.bank-item .ans { color: var(--mint-ink); font-size: 13px; margin-top: 2px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.gallery a { display: block; aspect-ratio: 3/4; border-radius: 10px; overflow: hidden; border: 1px solid var(--line); background: var(--canvas); }
.gallery img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .3s var(--ease); } .gallery a:hover img { transform: scale(1.04); }

/* ---------- grades ---------- */
table.grades { width: 100%; border-collapse: collapse; font-size: 14px; }
.grades th { text-align: left; font-size: 12px; color: var(--muted); font-weight: 600; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.grades td { padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.grades tr:last-child td { border-bottom: 0; }
.grades .bar { width: 140px; }

/* ---------- add ---------- */
.drop { border: 2px dashed var(--line-2); border-radius: var(--r); padding: 36px 20px; text-align: center; color: var(--muted); transition: border-color .14s, background .14s; cursor: pointer; }
.drop.over, .drop:hover { border-color: var(--blue); background: var(--blue-soft); color: var(--blue-ink); }
.drop svg { width: 28px; height: 28px; margin-bottom: 8px; }
.thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.thumbs div { position: relative; width: 64px; height: 84px; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); }
.thumbs img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumbs button { position: absolute; top: 3px; right: 3px; width: 20px; height: 20px; border-radius: 50%; border: 0; background: rgba(21,23,28,.75); color: #fff; display: grid; place-items: center; } .thumbs button svg { width: 12px; height: 12px; stroke-width: 2.5; }
.spin { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid var(--line-2); border-top-color: var(--ink); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 10px; font-size: 14px; font-weight: 500; opacity: 0; pointer-events: none; transition: opacity .2s, transform .25s var(--ease); z-index: 50; max-width: 90vw; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .shell { grid-template-columns: 220px minmax(0, 1fr); }
  .rail { grid-column: 2; padding: 0 28px 48px; }
}
@media (max-width: 760px) {
  /* phone: dark header with name, bottom tab bar for nav, single column */
  .shell { grid-template-columns: 1fr; }
  .side { position: sticky; top: 0; z-index: 20; height: auto; flex-direction: row; align-items: center; padding: 10px 16px; padding-top: calc(10px + env(safe-area-inset-top)); gap: 10px; }
  .who { padding: 4px 8px 4px 4px; background: transparent; } .who-name { font-size: 14px; white-space: nowrap; } .who-sub { font-size: 11px; white-space: nowrap; }
  .avatar { width: 30px; height: 30px; font-size: 13px; }
  .streak { margin-left: auto; padding: 0; font-size: 12px; } .side-foot { display: block; margin: 0 0 0 auto; }
  .nav { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; flex-direction: row; justify-content: space-around; gap: 0; background: var(--side); border-top: 1px solid var(--side-hi); padding: 6px 4px calc(6px + env(safe-area-inset-bottom)); }
  .nav a { flex: 1 1 0; flex-direction: column; gap: 3px; padding: 6px 2px; font-size: 10.5px; font-weight: 600; border-radius: 8px; min-width: 0; text-align: center; }
  .nav a svg { width: 20px; height: 20px; }
  .nav a .l { display: none; } .nav a::after { content: attr(data-short); }
  .nav a.on { background: transparent; color: var(--lav-mid); }
  .main { padding: 14px 16px calc(84px + env(safe-area-inset-bottom)); }
  .rail { grid-column: 1; padding: 0 16px calc(84px + env(safe-area-inset-bottom)); }
  .top { margin-bottom: 14px; } .top h1 { font-size: 22px; }
  .search { width: 150px; max-width: 45vw; padding: 7px 12px; }
  .card { padding: 16px; border-radius: 12px; } .card.tight { padding: 14px; }
  .grid-2 { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(3, 1fr); gap: 8px; } .stat { padding: 10px 8px; } .stat b { font-size: 20px; } .stat span { font-size: 11px; line-height: 1.2; display: block; }
  .tabs { overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; scrollbar-width: none; margin: 0 -16px 16px; padding: 0 16px; }
  .tabs::-webkit-scrollbar { display: none; } .tabs button { white-space: nowrap; padding: 10px 10px; font-size: 14px; }
  .topic-card { grid-template-columns: 44px 1fr; gap: 12px; } .glyph { width: 44px; height: 44px; font-size: 15px; border-radius: 11px; }
  .quiz .q { font-size: 18px; } .opt { padding: 11px 12px; font-size: 15px; }
  .card.lesson .card-title { font-size: 21px; } .lesson-body { font-size: 16px; }
  .lesson-visual table, .recap table { display: block; overflow-x: auto; white-space: nowrap; }
  .grades { display: block; overflow-x: auto; white-space: nowrap; } .grades .bar { width: 80px; }
  .secs-wide { grid-template-columns: 1fr; }
  .steps .step { gap: 12px; } .step-n { width: 30px; height: 30px; font-size: 13px; }
  .ring { width: 96px; height: 96px; } .ring svg { width: 96px; height: 96px; } .result-big { font-size: 36px; }
  .modal { width: 100vw; max-height: 100vh; height: 100vh; border-radius: 0; } .modal-body { max-height: calc(100vh - 70px); } .modal iframe { height: 55vh; }
  .login-card { padding: 20px; } .who-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
  .viewas { margin: 0 0 12px; }
  .drop { padding: 24px 12px; }
}
@media print {
  .side, .rail, .top, .tabs, .btn, .toast { display: none !important; }
  .shell { display: block; } .main { padding: 0; } .card { border: 0; box-shadow: none; padding: 0; }
  body { background: #fff; font-size: 12.5px; }
  .recap { max-width: none; } .recap h2 { break-after: avoid; } .recap table { break-inside: avoid; }
}

/* ---------- study path ---------- */
.lead { font-size: 16px; line-height: 1.55; color: var(--ink-2); max-width: 64ch; margin-bottom: 18px; }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.step { display: flex; gap: 16px; padding: 16px 0; border-top: 1px solid var(--line); }
.step:first-child { border-top: 0; padding-top: 4px; }
.step-n { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: 14px; background: var(--line); color: var(--ink-2); flex: none; margin-top: 2px; }
.step-n.small { width: 26px; height: 26px; font-size: 12px; }
.step.ready .step-n { background: var(--ink); color: #fff; }
.step.done .step-n, .step-n.done { background: var(--mint); color: var(--mint-ink); }
.step.locked { opacity: .55; }
.step h3 { font-size: 16px; }
.step details.why { margin-top: 6px; font-size: 13px; color: var(--ink-2); }
.step details.why summary { cursor: pointer; color: var(--blue-ink); font-weight: 600; list-style: none; }
.step details.why summary::-webkit-details-marker { display: none; }
.step details.why[open] summary { margin-bottom: 4px; }
.nudge { margin-top: 8px; padding: 8px 12px; border-radius: 10px; background: var(--peach); color: var(--peach-ink); font-size: 13px; }
.why-box { display: flex; gap: 10px; padding: 12px 14px; border-radius: 12px; background: var(--lav); color: var(--lav-ink); font-size: 13px; line-height: 1.45; }
.why-box svg { margin-top: 2px; } .why-box b { display: block; margin-bottom: 2px; }
.kbd.dark { background: rgba(255,255,255,.2); color: #fff; }

/* lesson cards */
.card.lesson .card-title { font-size: 24px; margin: 4px 0 12px; }
.lesson-body { font-size: 17px; line-height: 1.6; }
.lesson-body p { margin: 0 0 10px; } .lesson-body strong { font-weight: 700; }
.lesson-body.small { font-size: 14px; }
.lesson-visual { margin: 12px 0 4px; }
.lesson-visual table { border-collapse: collapse; width: 100%; font-size: 14px; }
.lesson-visual th, .lesson-visual td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.lesson-visual th { background: var(--canvas); font-weight: 700; font-size: 13px; }
.lesson-visual pre { background: var(--canvas); padding: 12px 14px; border-radius: 10px; font-size: 14px; line-height: 1.5; overflow-x: auto; margin: 0; }
.lesson-visual code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.hook { display: flex; gap: 10px; align-items: flex-start; margin-top: 14px; padding: 10px 14px; border-radius: 10px; background: var(--lime); color: var(--lime-ink); font-size: 14px; font-weight: 500; }
.hook svg { margin-top: 2px; }

/* sessions */
.conf { display: flex; align-items: center; gap: 8px; margin: -6px 0 14px; font-size: 13px; }
.chip { padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line-2); background: #fff; font-size: 13px; font-weight: 600; color: var(--ink-2); display: inline-flex; gap: 6px; align-items: center; }
.chip.on { background: var(--ink); color: #fff; border-color: var(--ink); } .chip.on .kbd { background: rgba(255,255,255,.2); color: #fff; }
.wordbank { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; padding: 10px 12px; border: 1px dashed var(--line-2); border-radius: 10px; }
.wordbank span { font-size: 13px; font-weight: 600; padding: 3px 9px; border-radius: 6px; background: var(--canvas); }
textarea.answer { width: 100%; min-height: 110px; padding: 12px 14px; border: 1px solid var(--line-2); border-radius: 12px; font-size: 15px; line-height: 1.5; resize: vertical; }
textarea.answer:focus { outline: 0; border-color: var(--ink); }
.fb.part { background: var(--peach); border-color: transparent; color: var(--peach-ink); }
.ok-btn { border-color: var(--mint-mid); background: var(--mint); color: var(--mint-ink); }
.bad-btn { border-color: #fda4af; background: var(--rose); color: var(--rose-ink); }
.score.sm { height: 32px; min-width: 38px; font-size: 14px; }

/* how page */
.how { max-width: 72ch; }
.rules { padding-left: 0; list-style: none; counter-reset: r; margin: 0; }
.rules li { counter-increment: r; display: grid; grid-template-columns: 40px 1fr; gap: 8px 14px; padding: 16px 0; border-top: 1px solid var(--line); }
.rules li::before { content: counter(r); grid-row: span 2; width: 36px; height: 36px; border-radius: 50%; background: var(--lav); color: var(--lav-ink); font-weight: 800; display: grid; place-items: center; }
.rules h3 { font-size: 17px; } .rules p { color: var(--ink-2); line-height: 1.55; }
.rules .example { grid-column: 2; margin-top: 8px; padding: 10px 14px; border-radius: 10px; background: var(--canvas); color: var(--ink-2); font-size: 14px; line-height: 1.5; }
.rules .example b { color: var(--ink); } .rules .example i { font-style: normal; font-weight: 600; padding: 0 5px; border-radius: 5px; background: var(--ink); color: #fff; font-size: 12px; }

/* evidence popout */
.ev-row { cursor: pointer; border-radius: 8px; margin: 0 -8px; padding-left: 8px !important; padding-right: 8px !important; transition: background .14s; }
.ev-row:hover { background: var(--canvas); } .ev-row svg:last-child { color: var(--muted); }
.modal { border: 0; border-radius: 16px; padding: 0; width: min(920px, 94vw); max-height: 92vh; background: var(--card); color: var(--ink); box-shadow: 0 24px 64px -24px rgba(21,23,28,.4); }
.modal::backdrop { background: rgba(21,23,28,.45); backdrop-filter: blur(2px); }
.modal-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; padding: 20px 22px 0; }
.modal-body { padding: 14px 22px 22px; overflow: auto; max-height: calc(92vh - 70px); }
.modal h2 { font-size: 20px; } .modal .cite { font-size: 13px; color: var(--ink-2); line-height: 1.5; margin: 6px 0 14px; }
.modal .nums { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin: 12px 0 16px; }
.modal .nums div { padding: 12px 14px; border-radius: 12px; background: var(--lav); color: var(--lav-ink); } .modal .nums b { display: block; font-size: 22px; letter-spacing: -0.02em; line-height: 1.1; } .modal .nums span { font-size: 12px; }
.modal p { margin: 0 0 10px; line-height: 1.55; color: var(--ink-2); } .modal p b { color: var(--ink); }
.modal iframe { width: 100%; height: 60vh; border: 1px solid var(--line); border-radius: 12px; margin-top: 10px; background: var(--canvas); }
.modal .links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

/* section scorecard */
.secs { display: flex; flex-direction: column; }
.sec-row { display: flex; flex-direction: column; gap: 6px; padding: 10px 0; border-top: 1px solid var(--line); }
.sec-row:first-child { border-top: 0; padding-top: 0; } .sec-row:last-child { padding-bottom: 0; }
.sec-row b { font-size: 14px; font-weight: 600; line-height: 1.3; }
.secs-wide { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 0 28px; }
.secs-wide .sec-row:nth-child(2) { border-top: 0; padding-top: 0; }
.pill.strong { background: var(--mint); color: var(--mint-ink); } .pill.mid { background: var(--peach); color: var(--peach-ink); } .pill.needs { background: var(--rose); color: var(--rose-ink); } .pill.none { background: var(--line); color: var(--muted); }
.fix-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 10px; font-weight: 600; color: var(--blue-ink); }
.fix-link svg { width: 14px; height: 14px; }
.modal .lesson-body { font-size: 16px; }

/* sign-in */
.login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 28px; width: min(560px, 100%); box-shadow: var(--shadow); }
.who-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
.who-tile { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 16px 10px; border: 1px solid var(--line-2); border-radius: 14px; background: #fff; font-weight: 600; transition: border-color .14s, transform .14s var(--ease); }
.who-tile:hover { border-color: var(--ink); transform: translateY(-1px); } .who-tile.on { border-color: var(--ink); background: var(--canvas); }
.pin-input { flex: 1; font-size: 20px; letter-spacing: .3em; padding: 10px 14px; border: 1px solid var(--line-2); border-radius: 10px; }
.pin-input:focus { outline: 0; border-color: var(--ink); }
.viewas { margin: -8px 0 16px; padding: 10px 14px; border-radius: 10px; background: var(--peach); color: var(--peach-ink); font-size: 14px; display: flex; align-items: center; gap: 12px; }
.viewas[hidden] { display: none; }
.viewas .btn { margin-left: auto; }
input.inline, select.inline { font: inherit; font-size: 14px; padding: 6px 8px; border: 1px solid transparent; border-radius: 8px; background: transparent; width: 100%; max-width: 220px; }
input.inline:hover, select.inline:hover { border-color: var(--line-2); } input.inline:focus, select.inline:focus { outline: 0; border-color: var(--blue); background: #fff; }
.who-sub a { color: var(--side-ink); }