:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --text: #1b2430;
  --muted: #5d6b7c;
  --border: #dbe2ea;
  --primary: #0f5c4d;
  --primary-ink: #ffffff;
  --primary-soft: #e3f1ed;
  --accent: #c98a1b;
  --ok: #1f8a4c;
  --ok-soft: #e5f5ec;
  --bad: #c0392b;
  --bad-soft: #fbeae8;
  --warn: #b7791f;
  --warn-soft: #fdf3e1;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .06);
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --surface: #182029;
    --surface-2: #1f2933;
    --text: #e6edf3;
    --muted: #93a1b0;
    --border: #2c3846;
    --primary: #3fb59a;
    --primary-ink: #0b1a16;
    --primary-soft: #16302a;
    --accent: #e0a944;
    --ok: #4cc27f;
    --ok-soft: #15301f;
    --bad: #ef6a5b;
    --bad-soft: #3a1c19;
    --warn: #e0a944;
    --warn-soft: #362b14;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; margin-top: 1.4em; }
p { margin: 0 0 1em; }
a { color: var(--primary); }
.muted { color: var(--muted); }
.small { font-size: .875rem; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--primary); color: var(--primary-ink);
  font-weight: 800; letter-spacing: .5px;
}
.brand-title { font-weight: 700; }
.brand-sub { font-size: .8rem; color: var(--muted); }
.topbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.screen-timer {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}
.timer-label { font-size: .8rem; color: var(--muted); }
.timer-value { font-weight: 700; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); }
.dot.paused { background: var(--warn); }
.user-chip { font-size: .875rem; color: var(--muted); max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: 980px; margin: 0 auto; padding: 24px 16px 48px; flex: 1; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 24px;
}
.card + .card { margin-top: 16px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.footer { text-align: center; padding: 16px; color: var(--muted); font-size: .8rem; }

/* ---------- Forms & buttons ---------- */
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
input[type=text], input[type=password] {
  width: 100%; padding: 10px 12px; font: inherit;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text);
}
input:focus-visible, button:focus-visible { outline: 3px solid var(--primary-soft); outline-offset: 1px; border-color: var(--primary); }
.field { margin-bottom: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: 8px; border: 1px solid transparent;
  background: var(--primary); color: var(--primary-ink);
  font: inherit; font-weight: 600; cursor: pointer;
}
.btn:hover:not(:disabled) { filter: brightness(1.07); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn.danger { background: var(--bad); color: #fff; }
.btn.small { padding: 6px 12px; font-size: .85rem; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

/* ---------- Progress & badges ---------- */
.progress { height: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--primary); transition: width .4s; }
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: .75rem; font-weight: 700; white-space: nowrap;
}
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.neutral { background: var(--surface-2); color: var(--muted); }

.notice { border-radius: 10px; padding: 12px 14px; margin: 12px 0; font-size: .92rem; }
.notice.warn { background: var(--warn-soft); border: 1px solid var(--warn); }
.notice.bad { background: var(--bad-soft); border: 1px solid var(--bad); }
.notice.ok { background: var(--ok-soft); border: 1px solid var(--ok); }
.notice.info { background: var(--primary-soft); border: 1px solid var(--primary); }

/* ---------- Dashboard ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 16px 0; }
.stat { background: var(--surface-2); border-radius: 10px; padding: 12px 14px; }
.stat .k { font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.stat .v { font-size: 1.35rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.module-list { list-style: none; padding: 0; margin: 0; }
.module-item {
  display: grid; grid-template-columns: 36px 1fr auto; gap: 12px; align-items: center;
  padding: 14px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); margin-bottom: 10px; cursor: pointer;
}
.module-item:hover { border-color: var(--primary); }
.module-num {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  background: var(--surface-2); font-weight: 700;
}
.module-item.done .module-num { background: var(--ok); color: #fff; }
.module-item.locked { cursor: not-allowed; background: var(--surface-2); border-style: dashed; }
.module-item.locked:hover { border-color: var(--border); }
.module-item.locked strong, .module-item.locked .module-meta { color: var(--muted); }
.module-item.locked .module-num { font-size: .95rem; }
.module-meta { font-size: .82rem; color: var(--muted); }
.module-item .progress { margin-top: 6px; }

/* ---------- Reader ---------- */
.reader-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; flex-wrap: wrap; }
.read-status {
  position: sticky; top: 64px; z-index: 10;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 14px; margin: 12px 0 20px; box-shadow: var(--shadow);
  display: grid; gap: 6px;
}
.read-status .row { display: flex; justify-content: space-between; gap: 10px; font-size: .88rem; flex-wrap: wrap; }
.content table { width: 100%; border-collapse: collapse; margin: 0 0 1em; font-size: .95rem; }
.content th, .content td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.content th { background: var(--surface-2); }
.content ul, .content ol { padding-left: 1.3em; margin: 0 0 1em; }
.content li { margin-bottom: .35em; }
.content figure { margin: 0 0 1.4em; text-align: center; }
.content figure img {
  max-width: 100%; max-height: 640px; height: auto;
  border: 1px solid var(--border); border-radius: 10px; background: #fff;
}
.content figcaption { font-size: .85rem; color: var(--muted); margin-top: 6px; }
.end-marker { margin-top: 28px; padding-top: 16px; border-top: 1px dashed var(--border); }

/* ---------- Quiz ---------- */
.quiz-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.quiz-timer { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.15rem; }
.quiz-timer.low { color: var(--bad); }
.question { font-size: 1.1rem; font-weight: 600; margin: 18px 0 14px; }
.options { display: grid; gap: 10px; }
.option {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer;
  background: var(--surface);
}
.option:hover { border-color: var(--primary); }
.option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option input { margin-top: 5px; accent-color: var(--primary); }
.qnav { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 18px; }
.qnav button {
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-size: .85rem; cursor: pointer;
}
.qnav button.answered { background: var(--primary-soft); border-color: var(--primary); }
.qnav button.current { outline: 2px solid var(--primary); }

/* ---------- Results ---------- */
.result-hero { text-align: center; padding: 12px 0 4px; }
.result-score { font-size: 3rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.result-score.pass { color: var(--ok); }
.result-score.fail { color: var(--bad); }
.review-item { border-top: 1px solid var(--border); padding: 12px 0; }
.review-item .ans { font-size: .9rem; }
.review-item .ans.right { color: var(--ok); }
.review-item .ans.wrong { color: var(--bad); }

table.data { width: 100%; border-collapse: collapse; font-size: .88rem; }
table.data th, table.data td { padding: 8px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
table.data th { background: var(--surface-2); }
.table-wrap { overflow-x: auto; }

/* ---------- Certificate ---------- */
.certificate {
  border: 6px double var(--primary); border-radius: 8px; padding: 36px 24px; text-align: center;
  background: var(--surface);
}
.certificate .cert-name { font-size: 2rem; font-weight: 800; margin: 10px 0; }

/* ---------- Sync chip, toast ---------- */
.sync-chip { font-size: .78rem; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); white-space: nowrap; }
.sync-chip:empty { display: none; }
.sync-chip[data-state="ok"] { color: var(--ok); border-color: var(--ok); background: var(--ok-soft); }
.sync-chip[data-state="saving"] { color: var(--muted); }
.sync-chip[data-state="offline"] { color: var(--warn); border-color: var(--warn); background: var(--warn-soft); }
.toast {
  position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); z-index: 60;
  background: var(--text); color: var(--bg); padding: 12px 18px; border-radius: 10px;
  box-shadow: var(--shadow); max-width: min(560px, calc(100vw - 32px)); font-size: .92rem;
}

/* ---------- Module list extras ---------- */
.badge.info { background: var(--primary-soft); color: var(--primary); }
.module-actions { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.module-actions .badges { display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
.checklist { list-style: none; padding: 0; margin: 0 0 8px; }
.checklist li { padding: 4px 0; color: var(--muted); }
.checklist li.ok { color: var(--ok); }

/* ---------- Admin ---------- */
.container.wide { max-width: 1280px; }
.kpis { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); margin-top: 0; }
.tabs { display: flex; gap: 4px; margin: 8px 0 0; flex-wrap: wrap; }
.tab {
  font: inherit; font-weight: 600; padding: 10px 16px; cursor: pointer;
  border: 1px solid var(--border); border-bottom: none; border-radius: 10px 10px 0 0;
  background: var(--surface-2); color: var(--muted);
}
.tab.active { background: var(--surface); color: var(--text); }
.card.tab-card { border-top-left-radius: 0; margin-top: 0; }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.toolbar input[type=search], .toolbar select {
  padding: 8px 12px; font: inherit; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text); min-width: 0;
}
.toolbar input[type=search] { flex: 1 1 260px; }
.toolbar .spacer { flex: 1; }
table.data th[data-sort] { cursor: pointer; user-select: none; }
table.data th.sorted { color: var(--primary); }
table.data tr.clickable { cursor: pointer; }
table.data tr.clickable:hover td { background: var(--surface-2); }
table.data.wrap td { white-space: normal; }
.mini-progress { width: 60px; height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; display: inline-block; vertical-align: middle; margin-right: 6px; }
.mini-progress > span { display: block; height: 100%; background: var(--primary); }
.online-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--border); margin-right: 6px; vertical-align: middle; }
.online-dot.on { background: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(10, 15, 20, .55);
  display: grid; place-items: center; padding: 16px; z-index: 50;
}
.modal-backdrop[hidden] { display: none; }
.modal { background: var(--surface); color: var(--text); border-radius: var(--radius); padding: 24px; max-width: 520px; width: 100%; box-shadow: var(--shadow); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

@media (max-width: 600px) {
  .card { padding: 18px; }
  .user-chip { display: none; }
  .read-status { top: 104px; }
  .content table { display: block; overflow-x: auto; }
  .module-item { grid-template-columns: 32px 1fr; }
  .module-item > :last-child { grid-column: 2; align-items: flex-start; }
  .module-actions .badges { justify-content: flex-start; }
  .sync-chip { display: none; }
}

@media print {
  .topbar, .footer, .no-print { display: none !important; }
  body { background: #fff; }
  .card { box-shadow: none; border: none; }
}