/* ---------- Tokens ---------- */
:root {
  --bg: #f5f6fb;
  --surface: #ffffff;
  --surface-2: #eef0f8;
  --border: #dfe3ef;
  --text: #151a2d;
  --muted: #5a6282;
  --accent: #5653e8;
  --accent-2: #9a56f0;
  --accent-ink: #ffffff;
  --accent-soft: rgba(86, 83, 232, 0.1);
  --good: #0f9b68;
  --good-soft: rgba(15, 155, 104, 0.12);
  --warn: #c97c06;
  --warn-soft: rgba(201, 124, 6, 0.13);
  --bad: #d93a52;
  --bad-soft: rgba(217, 58, 82, 0.11);
  --shadow: 0 1px 2px rgba(18, 22, 48, 0.06), 0 6px 20px rgba(18, 22, 48, 0.06);
  --radius: 14px;
  --radius-sm: 10px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --cat-l: 46%;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c0e19;
    --surface: #141727;
    --surface-2: #1b1f33;
    --border: #272c46;
    --text: #e7e9f7;
    --muted: #959cbd;
    --accent: #7d7bff;
    --accent-2: #b488ff;
    --accent-ink: #0c0e19;
    --accent-soft: rgba(125, 123, 255, 0.14);
    --good: #34d399;
    --good-soft: rgba(52, 211, 153, 0.13);
    --warn: #fbbf24;
    --warn-soft: rgba(251, 191, 36, 0.13);
    --bad: #fb7185;
    --bad-soft: rgba(251, 113, 133, 0.13);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.25);
    --cat-l: 68%;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0c0e19;
  --surface: #141727;
  --surface-2: #1b1f33;
  --border: #272c46;
  --text: #e7e9f7;
  --muted: #959cbd;
  --accent: #7d7bff;
  --accent-2: #b488ff;
  --accent-ink: #0c0e19;
  --accent-soft: rgba(125, 123, 255, 0.14);
  --good: #34d399;
  --good-soft: rgba(52, 211, 153, 0.13);
  --warn: #fbbf24;
  --warn-soft: rgba(251, 191, 36, 0.13);
  --bad: #fb7185;
  --bad-soft: rgba(251, 113, 133, 0.13);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.25);
  --cat-l: 68%;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.5em; letter-spacing: -0.01em; }
p { margin: 0 0 0.8em; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip-link:focus { left: 8px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1160px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark {
  font-family: var(--mono); font-size: 13px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; border-radius: 9px; padding: 5px 7px; letter-spacing: -0.04em;
}
.brand-name { font-size: 18px; }
.nav { display: flex; gap: 2px; margin-left: 8px; }
.nav a {
  display: flex; align-items: center; gap: 7px;
  padding: 7px 12px; border-radius: 9px; color: var(--muted); font-weight: 550; font-size: 15px;
}
.nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
.nav svg { width: 17px; height: 17px; }
.stats { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.stat-chip {
  display: flex; align-items: center; gap: 7px; padding: 5px 10px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border); font-size: 13px; font-weight: 600; white-space: nowrap;
}
.stat-chip svg { width: 15px; height: 15px; }
.stat-chip.streak { color: var(--warn); }
.stat-chip .lvl-name { color: var(--muted); font-weight: 550; }
.mini-bar { width: 54px; height: 5px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.mini-bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px; flex: none;
  border-radius: 10px; border: 1px solid var(--border); background: var(--surface); cursor: pointer; color: var(--muted);
}
.icon-btn:hover { color: var(--text); border-color: var(--muted); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn.active { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.icon-btn.recording { color: #fff; background: var(--bad); border-color: var(--bad); animation: pulse 1.4s infinite; }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 var(--bad-soft); } 50% { box-shadow: 0 0 0 8px transparent; } }

.tabbar { display: none; }

/* ---------- Layout ---------- */
.view { flex: 1; width: 100%; max-width: 1160px; margin: 0 auto; padding: 28px 16px 48px; outline: none; }
.loading { color: var(--muted); padding: 60px 0; text-align: center; }
.footer {
  max-width: 1160px; width: 100%; margin: 0 auto; padding: 20px 16px 32px;
  border-top: 1px solid var(--border); color: var(--muted); font-size: 13px;
  display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; align-items: center;
}
.footer p { margin: 0; }
.footer-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.link-btn { background: none; border: 0; padding: 0; color: var(--muted); cursor: pointer; font-size: 13px; text-decoration: underline; text-underline-offset: 3px; }
.link-btn:hover { color: var(--text); }
.link-btn.danger:hover { color: var(--bad); }

.page-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.page-head h1 { font-size: clamp(26px, 4vw, 34px); margin: 0; }
.page-head p { color: var(--muted); margin: 6px 0 0; }
.section-title { font-size: 20px; margin: 36px 0 14px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px;
}

/* ---------- Buttons & inputs ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 16px; border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-weight: 600; font-size: 15px;
  cursor: pointer; white-space: nowrap; transition: transform 0.06s ease, background 0.15s, border-color 0.15s;
}
.btn:hover { border-color: var(--muted); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn svg { width: 17px; height: 17px; }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-color: transparent; color: #fff; }
.btn.primary:hover { filter: brightness(1.07); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.ghost:hover { color: var(--text); background: var(--surface-2); }
.btn.small { padding: 6px 11px; font-size: 13px; border-radius: 9px; }
.btn.good { background: var(--good-soft); color: var(--good); border-color: transparent; }
.btn.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.btn.bad { background: var(--bad-soft); color: var(--bad); border-color: transparent; }
.btn .kbd { font-family: var(--mono); font-size: 11px; opacity: 0.7; border: 1px solid currentColor; border-radius: 5px; padding: 0 5px; }

.field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); font-weight: 600; }
.input, .select, .textarea {
  background: var(--surface); border: 1px solid var(--border); border-radius: 11px;
  padding: 10px 12px; font-size: 15px; color: var(--text); width: 100%;
}
.select { appearance: none; padding-right: 34px; cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 17px) 55%, calc(100% - 12px) 55%; background-size: 5px 5px; background-repeat: no-repeat; }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.textarea { min-height: 140px; resize: vertical; line-height: 1.55; }

.segmented { display: inline-flex; background: var(--surface-2); border-radius: 11px; padding: 3px; gap: 2px; }
.segmented button {
  border: 0; background: transparent; padding: 7px 13px; border-radius: 9px; cursor: pointer;
  font-weight: 600; font-size: 14px; color: var(--muted);
}
.segmented button[aria-pressed="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

/* ---------- Chips, tags, dots ---------- */
.chip {
  --h: 240;
  display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 650; white-space: nowrap;
  color: hsl(var(--h) 70% var(--cat-l)); background: hsl(var(--h) 80% 60% / 0.12);
}
.chip-btn { border: 1px solid transparent; cursor: pointer; font-size: 13px; padding: 6px 12px; }
.chip-btn[aria-pressed="true"] { border-color: currentColor; }
.chip-btn .count { opacity: 0.7; font-weight: 550; }
.tag {
  font-family: var(--mono); font-size: 11px; padding: 2px 7px; border-radius: 6px;
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); white-space: nowrap;
}
.dots { display: inline-flex; gap: 3px; }
.dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--border); }
.dots i.on { background: var(--good); border-color: var(--good); }

/* ---------- Home ---------- */
.hero { display: grid; grid-template-columns: 1.35fr 1fr; gap: 28px; align-items: center; margin-bottom: 30px; }
.eyebrow { font-family: var(--mono); font-size: 13px; color: var(--accent); font-weight: 600; letter-spacing: 0.02em; margin-bottom: 10px; }
.hero h1 { font-size: clamp(32px, 5.4vw, 52px); letter-spacing: -0.03em; margin-bottom: 14px; }
.hero h1 .grad {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent;
  padding-right: 0.08em; -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.lead { font-size: 18px; color: var(--muted); max-width: 560px; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.level-card { position: relative; overflow: hidden; }
.level-card::before {
  content: ""; position: absolute; inset: -40% -30% auto auto; width: 260px; height: 260px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-soft), transparent 70%); pointer-events: none;
}
.level-top { display: flex; justify-content: space-between; align-items: start; gap: 10px; }
.level-label { font-size: 13px; color: var(--muted); font-weight: 600; }
.level-name { font-size: 24px; font-weight: 750; letter-spacing: -0.02em; }
.xp-big { font-family: var(--mono); font-weight: 700; color: var(--accent); white-space: nowrap; }
.bar { height: 10px; border-radius: 99px; background: var(--surface-2); overflow: hidden; margin: 12px 0 6px; }
.bar > i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width 0.5s ease; }
.bar.good > i { background: var(--good); }
.level-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
.kpi { background: var(--surface-2); border-radius: var(--radius-sm); padding: 10px 12px; }
.kpi b { display: block; font-size: 20px; font-family: var(--mono); }
.kpi span { font-size: 12px; color: var(--muted); font-weight: 600; }

.modes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.mode-card { display: flex; flex-direction: column; gap: 8px; color: var(--text); transition: transform 0.15s, border-color 0.15s; }
.mode-card:hover { text-decoration: none; transform: translateY(-2px); border-color: var(--accent); }
.mode-icon { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); }
.mode-icon svg { width: 21px; height: 21px; }
.mode-card h3 { font-size: 17px; margin: 4px 0 0; }
.mode-card p { color: var(--muted); font-size: 14px; margin: 0; }
.badge-ai { font-family: var(--mono); font-size: 10px; font-weight: 700; padding: 2px 6px; border-radius: 6px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; vertical-align: middle; margin-left: 6px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; }
.totd .term-title { font-family: var(--mono); font-size: 24px; font-weight: 700; margin: 8px 0; letter-spacing: -0.02em; }
.totd .actions, .row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.recent-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.recent-list li { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; background: var(--surface-2); }
.recent-list .t { font-weight: 650; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.score-pill { font-family: var(--mono); font-weight: 700; font-size: 13px; padding: 2px 8px; border-radius: 99px; }
.score-pill.s-good { background: var(--good-soft); color: var(--good); }
.score-pill.s-mid { background: var(--warn-soft); color: var(--warn); }
.score-pill.s-bad { background: var(--bad-soft); color: var(--bad); }
.empty { color: var(--muted); font-size: 14px; padding: 12px 0; }

.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.cat-card { padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.cat-card h3 { font-size: 16px; margin: 0; display: flex; align-items: center; gap: 8px; }
.cat-card h3::before { content: ""; width: 10px; height: 10px; border-radius: 3px; background: hsl(var(--h) 75% 58%); flex: none; }
.cat-card p { color: var(--muted); font-size: 13px; margin: 0; flex: 1; }
.cat-card .bar { height: 6px; margin: 4px 0 0; }
.cat-meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); font-weight: 600; }
.cat-links { display: flex; gap: 12px; font-size: 13px; font-weight: 600; }

/* ---------- Glossary ---------- */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.toolbar .search { flex: 1 1 260px; position: relative; }
.toolbar .search svg { position: absolute; left: 12px; top: 50%; translate: 0 -50%; width: 17px; height: 17px; color: var(--muted); }
.toolbar .search .input { padding-left: 38px; }
.toolbar .select { width: auto; }
.toggle { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--muted); cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--accent); width: 16px; height: 16px; }
.chips-row { display: flex; gap: 6px; overflow-x: auto; padding: 4px 0 12px; scrollbar-width: thin; }
.result-count { color: var(--muted); font-size: 13px; margin: 4px 0 14px; }
.group-title { display: flex; align-items: baseline; gap: 10px; margin: 26px 0 12px; font-size: 18px; }
.group-title small { color: var(--muted); font-weight: 500; font-size: 13px; }
.term-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }
.term-card { padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.term-card header { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.term-card h3 { font-family: var(--mono); font-size: 16px; margin: 0; flex: 1 1 auto; letter-spacing: -0.01em; }
.term-card .def { margin: 0; font-size: 15px; }
.term-card .ex { margin: 0; font-size: 14px; color: var(--muted); font-style: italic; }
.term-card footer { display: flex; align-items: center; gap: 4px; margin-top: auto; padding-top: 4px; }
.term-card footer .spacer { flex: 1; }
.term-card .icon-btn { width: 32px; height: 32px; border-color: transparent; background: transparent; }
.term-card .icon-btn:hover { background: var(--surface-2); }
.term-card .icon-btn.starred { color: var(--warn); }
.term-card .icon-btn.starred svg { fill: currentColor; }
.study .term-card:not(.revealed) .def,
.study .term-card:not(.revealed) .ex { filter: blur(6px); user-select: none; cursor: pointer; }
.study .term-card:not(.revealed) { cursor: pointer; }
mark { background: var(--warn-soft); color: inherit; border-radius: 3px; padding: 0 1px; }

/* ---------- Setup panels ---------- */
.setup { max-width: 720px; }
.setup-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; margin-bottom: 18px; }
.setup .row { justify-content: space-between; }

/* ---------- Session (flashcards & quiz) ---------- */
.session { max-width: 760px; margin: 0 auto; }
.session-top { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.session-top .bar { flex: 1; margin: 0; height: 8px; }
.session-top .count { font-family: var(--mono); font-size: 13px; color: var(--muted); white-space: nowrap; }
.combo { font-family: var(--mono); font-weight: 700; color: var(--warn); font-size: 14px; white-space: nowrap; }

.flashcard { perspective: 1400px; cursor: pointer; outline: none; }
.fc-inner { position: relative; min-height: 300px; transition: transform 0.5s cubic-bezier(.2,.8,.2,1); transform-style: preserve-3d; }
.flashcard.flipped .fc-inner { transform: rotateY(180deg); }
.fc-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 12px; padding: 32px 28px;
}
.fc-back { transform: rotateY(180deg); }
.flashcard:focus-visible .fc-face { outline: 2px solid var(--accent); outline-offset: 2px; }
.fc-term { font-family: var(--mono); font-size: clamp(24px, 5vw, 36px); font-weight: 700; letter-spacing: -0.02em; }
.fc-def { font-size: 19px; max-width: 560px; }
.fc-ex { color: var(--muted); font-style: italic; max-width: 560px; }
.fc-hint { position: absolute; bottom: 14px; font-size: 12px; color: var(--muted); }
.fc-actions { display: flex; justify-content: center; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.fc-actions .btn { min-width: 110px; }

.question { padding: 26px; }
.q-kind { font-family: var(--mono); font-size: 12px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 10px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.q-prompt { font-size: 20px; font-weight: 600; margin-bottom: 18px; line-height: 1.45; }
.q-prompt .term-inline { font-family: var(--mono); color: var(--accent); }
.q-prompt .blank { display: inline-block; min-width: 110px; border-bottom: 2px dashed var(--accent); margin: 0 3px; }
.options { display: grid; gap: 10px; }
.option {
  display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%;
  padding: 13px 15px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); cursor: pointer; font-size: 15px;
  transition: border-color 0.15s, background 0.15s;
}
.option:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.option .key { font-family: var(--mono); font-size: 12px; font-weight: 700; border: 1px solid var(--border); border-radius: 6px; padding: 1px 7px; color: var(--muted); flex: none; margin-top: 1px; }
.option.mono-opt { font-family: var(--mono); font-weight: 600; }
.option.correct { border-color: var(--good); background: var(--good-soft); }
.option.wrong { border-color: var(--bad); background: var(--bad-soft); }
.option:disabled { cursor: default; }
.explain-box { margin-top: 16px; padding: 14px 16px; border-radius: 12px; background: var(--surface-2); font-size: 15px; }
.explain-box .t { font-family: var(--mono); font-weight: 700; }
.q-footer { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 18px; flex-wrap: wrap; }

.summary { text-align: center; max-width: 620px; margin: 0 auto; }
.summary .big { font-size: 56px; font-weight: 800; font-family: var(--mono); letter-spacing: -0.04em; margin: 6px 0; }
.summary .row { justify-content: center; margin-top: 18px; }
.missed { text-align: left; margin-top: 20px; }
.missed li { margin-bottom: 6px; }

/* ---------- Explain ---------- */
.explain-wrap { max-width: 820px; margin: 0 auto; }
.explain-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.explain-controls .row { gap: 8px; }
.explain-controls .select { width: auto; max-width: 100%; flex: 1 1 180px; }
.ai-status { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 650; color: var(--muted); }
.ai-status i { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.ai-status.on i { background: var(--good); box-shadow: 0 0 0 3px var(--good-soft); }
.explain-card { padding: 26px; }
.explain-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 10px; }
.term-big-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.term-big { font-family: var(--mono); font-size: clamp(28px, 5.5vw, 42px); font-weight: 750; letter-spacing: -0.03em; margin: 0; }
.explain-prompt { color: var(--muted); margin: 10px 0 14px; }
.hint-box { padding: 12px 14px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; margin-bottom: 14px; font-size: 15px; }
.answer-tools { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.answer-tools .spacer { flex: 1; }
.counter { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.counter.over { color: var(--bad); }
.thinking { display: flex; align-items: center; gap: 12px; color: var(--muted); padding: 22px 4px; }
.spinner { width: 20px; height: 20px; border-radius: 50%; border: 3px solid var(--surface-2); border-top-color: var(--accent); animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.result-card { margin-top: 16px; padding: 24px; animation: rise 0.35s ease; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.result-head { display: flex; gap: 18px; align-items: center; margin-bottom: 14px; }
.score-ring {
  --p: 0; --c: var(--accent);
  width: 84px; height: 84px; border-radius: 50%; flex: none; display: grid; place-items: center;
  background: radial-gradient(closest-side, var(--surface) 76%, transparent 78% 100%), conic-gradient(var(--c) calc(var(--p) * 1%), var(--surface-2) 0);
}
.score-ring span { font-family: var(--mono); font-size: 28px; font-weight: 800; line-height: 1; }
.score-ring small { font-size: 11px; color: var(--muted); display: block; text-align: center; }
.v-nailed_it .score-ring, .v-solid .score-ring { --c: var(--good); }
.v-partial .score-ring { --c: var(--warn); }
.v-off_track .score-ring { --c: var(--bad); }
.verdict { font-size: 22px; font-weight: 750; margin: 0 0 4px; }
.v-nailed_it .verdict, .v-solid .verdict { color: var(--good); }
.v-partial .verdict { color: var(--warn); }
.v-off_track .verdict { color: var(--bad); }
.result-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.result-block { background: var(--surface-2); border-radius: 12px; padding: 14px 16px; }
.result-block h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.result-block h4 svg { width: 15px; height: 15px; }
.result-block ul { margin: 0; padding-left: 18px; font-size: 15px; }
.result-block li { margin-bottom: 4px; }
.result-block.good h4 { color: var(--good); }
.result-block.miss h4 { color: var(--warn); }
.result-block + .result-block { margin-top: 12px; }
.result-cols .result-block + .result-block { margin-top: 0; }
.tip { margin-bottom: 10px; font-size: 15px; }
.tip del { color: var(--bad); text-decoration-thickness: 1.5px; }
.tip ins { color: var(--good); text-decoration: none; font-weight: 600; }
.tip small { display: block; color: var(--muted); font-size: 13px; }
.model-answer { font-size: 16px; margin: 0; }
.ref .t { font-family: var(--mono); font-weight: 700; }
.result-actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; margin-top: 18px; }
.self-grade { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.notice { padding: 12px 14px; border-radius: 12px; background: var(--warn-soft); color: var(--text); font-size: 14px; margin-top: 14px; }

/* ---------- Toasts ---------- */
.toasts { position: fixed; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 50; pointer-events: none; }
.toast {
  background: var(--text); color: var(--bg); padding: 10px 14px; border-radius: 12px; font-weight: 600; font-size: 14px;
  box-shadow: var(--shadow); animation: rise 0.25s ease; max-width: 340px;
}
.toast.xp { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; font-family: var(--mono); }
.toast.level { background: var(--good); color: #fff; font-size: 15px; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .modes { grid-template-columns: repeat(2, 1fr); }
  .hero { grid-template-columns: 1fr; }
  .stat-chip .lvl-name, .mini-bar { display: none; }
}
@media (max-width: 760px) {
  .nav { display: none; }
  .topbar-inner { padding: 8px 16px; }
  .view { padding: 20px 16px 96px; }
  .footer { padding-bottom: 96px; }
  .tabbar {
    display: grid; grid-template-columns: repeat(5, 1fr);
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
    background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(12px);
    border-top: 1px solid var(--border); padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  }
  .tabbar a { display: flex; flex-direction: column; align-items: center; gap: 2px; font-size: 11px; font-weight: 600; color: var(--muted); padding: 4px 0; }
  .tabbar a:hover { text-decoration: none; }
  .tabbar a[aria-current="page"] { color: var(--accent); }
  .tabbar svg { width: 21px; height: 21px; }
  .two-col, .result-cols { grid-template-columns: 1fr; }
  .term-grid { grid-template-columns: 1fr; }
  .toasts { bottom: 84px; left: 16px; right: 16px; align-items: center; }
  .question, .explain-card, .result-card { padding: 18px; }
  .q-prompt { font-size: 18px; }
  .fc-inner { min-height: 280px; }
  .fc-actions .btn { min-width: 0; flex: 1; }
}
@media (max-width: 420px) {
  .modes { grid-template-columns: 1fr; }
  .level-stats { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .kpi { padding: 8px; }
  .kpi b { font-size: 17px; }
  .result-head { gap: 12px; }
  .score-ring { width: 70px; height: 70px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}