:root {
  --bg: #F4F3EF;
  --card: #FFFFFF;
  --ink: #1C1F24;
  --muted: #5A5F68;
  --line: #E2E0D9;
  --line-soft: #EEECE6;
  --line-strong: #D8D6CF;
  --accent: #2448B8;
  --accent-ink: #FFFFFF;
  --accent-soft: #E4E9F8;
  --accent-deep: #1E3A8A;
  --work: #E8A33D;
  --warn-soft: #FCEBD0;
  --warn-ink: #7A4508;
  --wrong: #C2410C;
  --wrong-soft: #FDEBDD;
  --bar: #2448B8;
  --head: #1C1F24;
  --head-ink: #F4F3EF;
  --head-muted: #C9CCD2;
  --head-chip: #33373E;
  --head-line: #4A4F57;
  --display: 'Space Grotesk', system-ui, sans-serif;
  --body: Inter, system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171B;
    --card: #1E2127;
    --ink: #ECEBE6;
    --muted: #A3A8B1;
    --line: #2E3239;
    --line-soft: #272A30;
    --line-strong: #3A3F47;
    --accent: #6F8FF0;
    --accent-ink: #0D1530;
    --accent-soft: #1F2A4D;
    --accent-deep: #B9C8F8;
    --work: #E8A33D;
    --warn-soft: #3B2A12;
    --warn-ink: #F3C987;
    --wrong: #F08A5D;
    --wrong-soft: #3A2017;
    --bar: #6F8FF0;
    --head: #0E1013;
    --head-chip: #262A31;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--body); font-size: 16px; line-height: 1.45; -webkit-font-smoothing: antialiased; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent); }
h1, h2, h3 { font-family: var(--display); margin: 0; line-height: 1.15; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.hidden { display: none !important; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 18px; border-radius: 10px; border: 1px solid var(--line-strong); background: var(--card); color: var(--ink); font-weight: 600; text-decoration: none; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.sm { min-height: 40px; padding: 0 14px; font-size: 14px; }
.btn:disabled { opacity: .5; cursor: default; }
.btn:focus-visible, .opt:focus-visible, .check:focus-within, .chip:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* header */
.top { background: var(--head); color: var(--head-ink); }
.top-in { max-width: 1180px; margin: 0 auto; padding: 14px 20px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; background: none; border: 0; color: inherit; padding: 0; }
.logo { width: 36px; height: 36px; border-radius: 8px; background: var(--head-ink); color: #1C1F24; display: grid; place-items: center; font-family: var(--display); font-weight: 700; }
.brand-name { font-family: var(--display); font-weight: 600; font-size: 18px; }
.nav { display: flex; flex-wrap: wrap; gap: 6px; }
.nav button { background: transparent; border: 0; color: var(--head-muted); padding: 10px 14px; border-radius: 8px; min-height: 44px; }
.nav button.on { background: var(--head-chip); color: var(--head-ink); }
.nav button.out { border: 1px solid var(--head-line); }

main { max-width: 1180px; margin: 0 auto; padding: 28px 20px 64px; display: flex; flex-direction: column; gap: 28px; }

/* hero */
.hero { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-end; justify-content: space-between; }
.hero h1 { font-size: clamp(28px, 5vw, 40px); }
.hero .actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.stat .v { font-family: var(--display); font-size: 32px; font-weight: 700; margin-top: 4px; }

/* sections */
.sec-head { display: flex; flex-wrap: wrap; gap: 10px; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.sec-head h2 { font-size: 24px; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }

.modes { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.mode { text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; display: flex; flex-direction: column; gap: 4px; min-height: 92px; }
.mode:hover { border-color: var(--accent); }
.mode b { font-family: var(--display); font-size: 17px; }

.subjects { display: flex; flex-direction: column; gap: 14px; }
.subject { background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.subject-head { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--line-soft); }
.subject-head h3 { font-size: 19px; }
.meter { display: flex; align-items: center; gap: 12px; flex: 0 1 320px; min-width: 200px; }
.bar { flex: 1; height: 10px; background: var(--line-soft); border-radius: 99px; overflow: hidden; display: flex; }
.bar i { display: block; height: 100%; }
.bar .safe { background: var(--bar); }
.bar .work { background: var(--work); }
.meter b { width: 48px; text-align: right; font-size: 15px; }

.doc { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; padding: 10px 20px; border-bottom: 1px solid var(--line-soft); }
.doc:last-child { border-bottom: 0; }
.check { display: flex; align-items: center; gap: 12px; flex: 1 1 240px; min-height: 44px; cursor: pointer; }
.check input { width: 22px; height: 22px; accent-color: var(--accent); flex: 0 0 auto; margin: 0; }
.check.done span { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--line-strong); }
.tag { font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 99px; background: var(--warn-soft); color: var(--warn-ink); white-space: nowrap; }
.tag.blue { background: var(--accent-soft); color: var(--accent-deep); }
.doc .stat-line { font-size: 13px; color: var(--muted); }
.topics { padding: 6px 20px 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: 12px; padding: 5px 10px; border-radius: 99px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
.chip.safe { border-color: var(--bar); background: var(--accent-soft); color: var(--accent-deep); }
.chip.work { border-color: var(--work); background: var(--warn-soft); color: var(--warn-ink); }
details.more summary { cursor: pointer; padding: 8px 20px 12px; font-size: 13px; color: var(--muted); }

.empty { background: var(--card); border: 1px dashed var(--line-strong); border-radius: 14px; padding: 18px 20px; color: var(--muted); }

/* quiz */
.quiz { max-width: 720px; width: 100%; margin: 0 auto; padding: 12px 20px 140px; display: flex; flex-direction: column; gap: 16px; }
.quiz-top { display: flex; flex-direction: column; gap: 10px; position: sticky; top: 0; background: var(--bg); padding: 10px 0; z-index: 2; }
.quiz-top .row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.icon-btn { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 10px; border: 0; background: transparent; color: var(--ink); }
.icon-btn:hover { background: var(--line-soft); }
.progress { height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--accent); transition: width .25s; }
.timer { font-variant-numeric: tabular-nums; font-weight: 600; }
.timer.low { color: var(--wrong); }
.tags { display: flex; gap: 8px; flex-wrap: wrap; }
.question { font-size: clamp(19px, 3.2vw, 23px); font-weight: 600; line-height: 1.35; }
.opts { display: flex; flex-direction: column; gap: 10px; }
.opt { display: flex; gap: 12px; align-items: center; width: 100%; min-height: 56px; padding: 12px 14px; border-radius: 12px; background: var(--card); border: 1px solid var(--line-strong); text-align: left; font-size: 16px; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt:disabled { cursor: default; }
.opt .k { flex: 0 0 auto; width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; font-weight: 700; font-size: 14px; background: var(--line-soft); }
.opt.sel { border: 2px solid var(--accent); }
.opt.sel .k { background: var(--accent); color: var(--accent-ink); }
.opt.right { border: 2px solid var(--accent); background: var(--accent-soft); }
.opt.right .k { background: var(--accent); color: var(--accent-ink); }
.opt.wrong { border: 2px solid var(--wrong); background: var(--wrong-soft); }
.opt.wrong .k { background: var(--wrong); color: #fff; }
.feedback { display: flex; flex-direction: column; gap: 8px; padding: 16px; border-radius: 14px; background: var(--card); border: 1px solid var(--accent); }
.feedback.bad { border-color: var(--wrong); }
.feedback h3 { font-size: 18px; }
.feedback p { margin: 0; font-size: 15px; line-height: 1.55; }
.bottom { position: fixed; left: 0; right: 0; bottom: 0; background: var(--card); border-top: 1px solid var(--line); padding: 12px 20px calc(16px + env(safe-area-inset-bottom)); z-index: 3; }
.bottom-in { max-width: 720px; margin: 0 auto; display: flex; gap: 10px; }
.bottom-in .btn { min-height: 52px; }
.bottom-in .grow { flex: 1; }

/* results */
.result { max-width: 720px; width: 100%; margin: 0 auto; padding: 28px 20px 64px; display: flex; flex-direction: column; gap: 20px; }
.big { font-family: var(--display); font-size: 56px; font-weight: 700; line-height: 1; }
.verdict { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; display: flex; flex-direction: column; gap: 10px; }
.verdict p { margin: 0; }
.review { display: flex; flex-direction: column; gap: 10px; }
.review-item { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; display: flex; flex-direction: column; gap: 6px; font-size: 15px; }
.review-item.bad { border-color: var(--wrong); }
.row-btns { display: flex; flex-wrap: wrap; gap: 10px; }

/* picker */
.picker { display: flex; flex-direction: column; gap: 10px; }
.picker-list { display: flex; flex-direction: column; gap: 8px; }
.pick { display: flex; justify-content: space-between; align-items: center; gap: 10px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; min-height: 52px; text-align: left; }
.pick:hover { border-color: var(--accent); }
.pick.sub { margin-left: 20px; }

/* login */
.login { min-height: 100vh; background: var(--head); color: var(--head-ink); display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 40px 20px; }
.login-in { width: 100%; max-width: 400px; display: flex; flex-direction: column; gap: 28px; }
.login .logo { width: 52px; height: 52px; font-size: 20px; border-radius: 12px; }
.login h1 { font-size: 34px; }
.login p { margin: 0; color: var(--head-muted); }
.login form { background: #F4F3EF; color: #1C1F24; border-radius: 18px; padding: 24px 20px; display: flex; flex-direction: column; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 14px; font-weight: 600; }
.field input { font-size: 16px; min-height: 50px; padding: 0 14px; border-radius: 10px; border: 1px solid #C9C6BD; background: #FFFFFF; color: #1C1F24; }
.login .btn.primary { background: #2448B8; border-color: #2448B8; color: #fff; }
.err { color: #B23A08; font-size: 14px; min-height: 1em; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 12px 18px; border-radius: 10px; font-size: 14px; z-index: 10; }

dialog { border: 1px solid var(--line); border-radius: 16px; padding: 22px; background: var(--card); color: var(--ink); max-width: 440px; width: calc(100% - 32px); }
dialog::backdrop { background: rgba(0,0,0,.45); }
dialog form { display: flex; flex-direction: column; gap: 14px; }
dialog .field input { background: var(--bg); color: var(--ink); border-color: var(--line-strong); }

/* reading */
.toc { display: flex; flex-direction: column; padding: 0 12px 10px; }
.toc-row { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 2px 8px; border-radius: 8px; }
.toc-row:hover { background: var(--bg); }
.toc-row.lvl4 { padding-left: 32px; }
.toc-row input { width: 20px; height: 20px; accent-color: var(--accent); flex: 0 0 auto; margin: 0; }
.toc-link { flex: 1; text-align: left; background: none; border: 0; padding: 8px 0; color: var(--ink); font-size: 15px; }
.toc-link:hover { color: var(--accent); }
.reader-top { position: sticky; top: 0; z-index: 2; background: var(--bg); border-bottom: 1px solid var(--line); }
.reader-top-in { max-width: 760px; margin: 0 auto; padding: 8px 16px; display: flex; align-items: center; gap: 10px; }
.reader-crumb { flex: 1; text-align: center; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.read-toggle { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; min-height: 44px; cursor: pointer; }
.read-toggle input { width: 20px; height: 20px; accent-color: var(--accent); margin: 0; }
.reader-top .progress { border-radius: 0; height: 3px; }
.reader { max-width: 700px; margin: 0 auto; padding: 28px 20px 160px; font-size: 18px; line-height: 1.7; }
.reader h1 { font-size: clamp(26px, 4.5vw, 34px); margin: 6px 0 22px; }
.reader h3 { font-size: 21px; margin: 32px 0 10px; }
.reader p { margin: 0 0 16px; hyphens: auto; }
.reader ul { margin: 0 0 18px; padding-left: 22px; }
.reader li { margin-bottom: 6px; }
.callout { margin: 24px 0 10px; padding: 10px 14px; border-radius: 10px; background: var(--accent-soft); color: var(--accent-deep); font-weight: 600; font-size: 16px; }
.reader-note { margin-top: 40px !important; padding-top: 16px; border-top: 1px solid var(--line); }
@media (max-width: 560px) { .reader { font-size: 17px; padding: 20px 16px 150px; } }

@media (max-width: 560px) {
  main { padding: 20px 16px 56px; gap: 22px; }
  .top-in { padding: 10px 16px; }
  .nav button { padding: 8px 10px; font-size: 14px; }
  .doc, .subject-head { padding-left: 16px; padding-right: 16px; }
  .quiz, .result { padding-left: 16px; padding-right: 16px; }
  .stat .v { font-size: 26px; }
}