:root {
  --bg: #f4f8fa;
  --surface: #ffffff;
  --surface-2: #eaf2f5;
  --text: #17313d;
  --muted: #5b7380;
  --border: #d7e4ea;
  --primary: #13708a;
  --primary-strong: #0d5568;
  --primary-soft: #dff0f4;
  --on-primary: #ffffff;
  --accent: #23935f;
  --accent-soft: #e0f3e9;
  --warn: #b5532a;
  --warn-soft: #fbece4;
  --danger: #b8333b;
  --shadow: 0 1px 2px rgba(16, 50, 64, .06), 0 8px 24px rgba(16, 50, 64, .06);
  --radius: 16px;
  --font-head: 'Montserrat', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1a20;
    --surface: #14242c;
    --surface-2: #1b2f39;
    --text: #e3eef2;
    --muted: #94acb7;
    --border: #2a414c;
    --primary: #4bb3cc;
    --primary-strong: #7fd0e2;
    --primary-soft: #183a46;
    --on-primary: #06222b;
    --accent: #4cc48a;
    --accent-soft: #173a2b;
    --warn: #f0976b;
    --warn-soft: #3d261c;
    --danger: #f07a80;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1a20;
  --surface: #14242c;
  --surface-2: #1b2f39;
  --text: #e3eef2;
  --muted: #94acb7;
  --border: #2a414c;
  --primary: #4bb3cc;
  --primary-strong: #7fd0e2;
  --primary-soft: #183a46;
  --on-primary: #06222b;
  --accent: #4cc48a;
  --accent-soft: #173a2b;
  --warn: #f0976b;
  --warn-soft: #3d261c;
  --danger: #f07a80;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; outline: none; }
h1, h2, h3 { font-family: var(--font-head); line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(1.8rem, 4.5vw, 2.8rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.35rem, 3vw, 1.8rem); }
h3 { font-size: 1.12rem; margin-top: 1.6em; }
p { margin: 0 0 1em; }
a { color: var(--primary); }
img { max-width: 100%; }
.muted { color: var(--muted); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 780px; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--primary); color: #fff; padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

/* ── Header ── */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.logo__mark { color: var(--primary); display: flex; }
.logo__text { font-family: var(--font-head); font-size: 1.15rem; font-weight: 600; }
.logo__text b { color: var(--primary); font-weight: 700; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  text-decoration: none; color: var(--muted); font-weight: 500;
  padding: 8px 14px; border-radius: 10px;
}
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a.active { color: var(--primary); background: var(--primary-soft); }
.theme-btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  width: 38px; height: 38px; border-radius: 10px; cursor: pointer; margin-left: 6px;
  display: inline-grid; place-items: center;
}
.menu-btn { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.menu-btn span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; }

@media (max-width: 720px) {
  .menu-btn { display: block; }
  .nav {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 8px 16px 16px; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px; }
  .theme-btn { margin: 8px 0 0; width: 100%; }
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 600 .98rem var(--font-body);
  padding: 12px 22px; border-radius: 12px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none; transition: transform .15s, background .15s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--primary); color: var(--on-primary); }
.btn--primary:hover { background: var(--primary-strong); }
.btn--ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--sm { padding: 8px 14px; font-size: .9rem; border-radius: 10px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ── Hero ── */
.hero { padding: 56px 0 40px; }
.hero__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.eyebrow {
  display: inline-block; font-size: .82rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 999px; margin-bottom: 16px;
}
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 560px; margin-bottom: 28px; }
.hero__card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 24px;
  box-shadow: var(--shadow);
}
.hero__card h3 { margin-top: 0; }
.mini-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.mini-list li { display: flex; gap: 12px; align-items: center; padding: 12px; background: var(--surface-2); border-radius: 12px; }
.mini-list .ico { font-size: 1.4rem; }
.mini-list small { display: block; color: var(--muted); }
@media (max-width: 860px) { .hero__grid { grid-template-columns: 1fr; } .hero { padding-top: 32px; } }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 8px 0 56px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.stat b { display: block; font: 700 1.8rem var(--font-head); color: var(--primary); }
.stat span { color: var(--muted); font-size: .92rem; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }

.section { margin-bottom: 64px; }
.section__head { display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.section__head p { margin: 0; color: var(--muted); }

.how { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: how; }
.how div { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; position: relative; }
.how div::before {
  counter-increment: how; content: counter(how);
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--primary-soft); color: var(--primary); font: 700 1rem var(--font-head); margin-bottom: 12px;
}
.how b { display: block; margin-bottom: 4px; }
.how p { margin: 0; color: var(--muted); font-size: .94rem; }
@media (max-width: 860px) { .how { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .how { grid-template-columns: 1fr; } }

/* ── Courses grid ── */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 8px 14px; border-radius: 999px; cursor: pointer; font: 500 .9rem var(--font-body);
}
.chip[aria-pressed="true"] { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.search {
  width: 100%; max-width: 420px; padding: 12px 16px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; margin-bottom: 16px;
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
@media (max-width: 360px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; display: flex; flex-direction: column; gap: 10px;
  text-decoration: none; color: inherit; transition: transform .15s, box-shadow .15s, border-color .15s;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--primary); }
.card__top { display: flex; justify-content: space-between; align-items: start; gap: 8px; }
.card__icon { font-size: 1.8rem; width: 52px; height: 52px; display: grid; place-items: center; background: var(--surface-2); border-radius: 14px; }
.card h3 { margin: 4px 0 0; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: .94rem; flex: 1; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 14px; color: var(--muted); font-size: .85rem; }
.badge { font-size: .76rem; font-weight: 600; padding: 4px 10px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); white-space: nowrap; }
.badge--done { background: var(--accent-soft); color: var(--accent); }
.empty { padding: 40px; text-align: center; color: var(--muted); background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius); }

.progress { height: 8px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.progress > i { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .4s; }

/* ── Course page ── */
.crumbs { font-size: .9rem; color: var(--muted); margin: 24px 0 16px; }
.crumbs a { color: var(--muted); }
.course-head {
  background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 28px;
  display: grid; grid-template-columns: 1fr 280px; gap: 28px; margin-bottom: 28px;
}
.course-head .card__icon { width: 64px; height: 64px; font-size: 2.2rem; margin-bottom: 12px; }
.course-head aside { background: var(--surface-2); border-radius: var(--radius); padding: 20px; align-self: start; }
.course-head aside .btn { width: 100%; margin-top: 14px; }
@media (max-width: 820px) { .course-head { grid-template-columns: 1fr; padding: 20px; } }

.lesson-list { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 10px; }
.lesson-list a {
  display: flex; align-items: center; gap: 14px; padding: 16px 18px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  text-decoration: none; color: var(--text);
}
.lesson-list a:hover { border-color: var(--primary); }
.lesson-num {
  flex: none; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  background: var(--surface-2); color: var(--muted); font-weight: 600;
}
.done .lesson-num { background: var(--accent); color: var(--on-primary); }
.lesson-list .t { flex: 1; }
.lesson-list small { color: var(--muted); }
.quiz-link .lesson-num { background: var(--primary-soft); color: var(--primary); }

/* ── Lesson ── */
.lesson { background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: clamp(20px, 4vw, 40px); margin-bottom: 24px; }
.lesson h1 { font-size: clamp(1.5rem, 3.5vw, 2.1rem); }
.lesson ul, .lesson ol { padding-left: 1.3em; }
.lesson li { margin-bottom: .4em; }
.note { background: var(--primary-soft); border-left: 4px solid var(--primary); padding: 14px 18px; border-radius: 10px; margin: 20px 0; }
.note.warn { background: var(--warn-soft); border-color: var(--warn); }
.flags li::marker { content: '⚑  '; color: var(--danger); }
.steps { display: grid; gap: 8px; margin: 16px 0; }
.step { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; padding: 12px 16px; background: var(--surface-2); border-radius: 12px; }
.step b { color: var(--primary); font-family: var(--font-head); }
.step span { color: var(--muted); }
.dialog { border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; margin: 16px 0; background: var(--bg); }
.dialog p { margin: 0 0 .6em; }
.dialog p:last-child { margin: 0; }
.dialog em { font-style: normal; font-weight: 600; color: var(--primary); }
.pair { padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 10px; }
.pair b { display: block; color: var(--danger); margin-bottom: 2px; }
.pair span { color: var(--muted); }
.takeaways { background: var(--accent-soft); border-radius: var(--radius); padding: 20px 24px; margin-top: 28px; }
.takeaways h3 { margin-top: 0; color: var(--accent); }
.takeaways ul { margin: 0; }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 48px; }

/* ── Quiz ── */
.quiz { background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: clamp(20px, 4vw, 36px); margin-bottom: 48px; }
.quiz__top { display: flex; justify-content: space-between; color: var(--muted); font-size: .9rem; margin-bottom: 10px; }
.quiz .progress { margin-bottom: 24px; }
.quiz h2 { font-size: 1.3rem; }
.options { display: grid; gap: 10px; margin: 20px 0; }
.option {
  text-align: left; padding: 14px 16px; border-radius: 12px; border: 2px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; cursor: pointer;
}
.option:hover:not([disabled]) { border-color: var(--primary); }
.option.correct { border-color: var(--accent); background: var(--accent-soft); }
.option.wrong { border-color: var(--danger); background: var(--warn-soft); }
.option[disabled] { cursor: default; }
.explain { padding: 14px 16px; border-radius: 12px; background: var(--surface-2); margin-bottom: 20px; }
.result { text-align: center; padding: 12px 0; }
.result__score { font: 700 3.4rem var(--font-head); color: var(--primary); }
.result.pass .result__score { color: var(--accent); }

/* ── Profile ── */
.profile-grid { display: grid; grid-template-columns: 320px 1fr; gap: 24px; margin: 24px 0 48px; align-items: start; }
@media (max-width: 860px) { .profile-grid { grid-template-columns: 1fr; } }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.panel h3 { margin-top: 0; }
.field { display: grid; gap: 6px; margin-bottom: 14px; }
.field input {
  padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font: inherit;
}
.ring { width: 140px; height: 140px; margin: 8px auto 16px; display: block; }
.row-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.row-list li { display: flex; align-items: center; gap: 14px; padding: 14px; border: 1px solid var(--border); border-radius: 12px; flex-wrap: wrap; }
.row-list .grow { flex: 1; min-width: 180px; }
.row-list .progress { margin-top: 8px; }

/* ── Certificate ── */
.cert-wrap { padding: 24px 0 48px; }
.cert {
  background: #fffdf8; color: #17313d; max-width: 900px; margin: 0 auto 24px;
  border: 10px solid #13708a; outline: 2px solid #c9a24a; outline-offset: -22px;
  padding: clamp(28px, 6vw, 64px); text-align: center; border-radius: 6px;
}
.cert .logo__text { font-size: 1.4rem; }
.cert .logo__text b { color: #13708a; }
.cert h1 { font-size: clamp(1.6rem, 5vw, 2.6rem); color: #13708a; margin: 20px 0 6px; letter-spacing: .06em; text-transform: uppercase; }
.cert .name { font: 600 clamp(1.4rem, 4vw, 2.2rem) var(--font-head); border-bottom: 2px solid #c9a24a; display: inline-block; padding: 0 20px 6px; margin: 16px 0; }
.cert .course { font-size: 1.2rem; font-weight: 600; margin: 8px 0 24px; }
.cert .cert__foot { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .9rem; color: #5b7380; margin-top: 32px; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(120px);
  background: var(--text); color: var(--bg); padding: 12px 20px; border-radius: 12px; font-weight: 500;
  transition: transform .3s, opacity .3s; z-index: 50; max-width: calc(100% - 32px);
  opacity: 0; visibility: hidden;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; visibility: visible; }

/* ── Footer ── */
.footer { border-top: 1px solid var(--border); background: var(--surface); padding: 28px 0; margin-top: auto; }
.footer__inner { display: grid; grid-template-columns: 1fr 2fr; gap: 24px; }
.footer p { margin: 6px 0 0; font-size: .9rem; }
.disclaimer { color: var(--muted); }
@media (max-width: 720px) { .footer__inner { grid-template-columns: 1fr; } }

@media print {
  .topbar, .footer, .no-print, .toast, .skip { display: none !important; }
  body { background: #fff; }
  .cert-wrap { padding: 0; }
  .cert { margin: 0; max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ── Личные кабинеты ── */
.nav-logout {
  border: 0; background: none; color: var(--muted); font: 500 1rem var(--font-body);
  padding: 8px 14px; border-radius: 10px; cursor: pointer;
}
.nav-logout:hover { color: var(--text); background: var(--surface-2); }
[hidden] { display: none !important; }
.small { font-size: .88rem; }
.btn--block { width: 100%; }
.btn--danger { background: var(--danger); color: var(--on-primary); }
.demo-banner {
  margin: 16px 0 0; padding: 10px 14px; border-radius: 12px;
  background: var(--warn-soft); color: var(--warn); font-size: .9rem;
}
.form-error { margin: 0 0 12px; padding: 10px 14px; border-radius: 10px; background: var(--warn-soft); color: var(--danger); font-size: .92rem; }
.auth { padding: 40px 16px 64px; display: flex; justify-content: center; }
.auth__panel { width: 100%; max-width: 440px; padding: 28px; }
.auth__panel h1 { font-size: 1.6rem; }
.auth__alt { margin: 18px 0 0; text-align: center; color: var(--muted); }
.field input, .field textarea, .field select, .toolbar select, .toolbar .search {
  width: 100%; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: inherit;
}
.field textarea { resize: vertical; font-size: .92rem; }
.field label { font-weight: 500; font-size: .94rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .field-row { grid-template-columns: 1fr; } }
.input-with-btn { display: flex; gap: 8px; }
.input-with-btn input { flex: 1; min-width: 0; }
.check { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--primary); }
.panel-details { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 12px; }
.panel-details summary { cursor: pointer; font-weight: 500; margin-bottom: 12px; }
.cert__verify { font-size: .78rem; color: #5b7380; margin: 14px 0 0; word-break: break-all; }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: .9em; }

/* Кабинет руководителя */
.admin-grid { display: grid; grid-template-columns: 1fr 300px; gap: 20px; margin-bottom: 48px; align-items: start; }
.admin-side { display: grid; gap: 20px; }
@media (max-width: 1000px) { .admin-grid { grid-template-columns: 1fr; } }
.toolbar { display: grid; grid-template-columns: 1fr 180px 160px; gap: 10px; margin-bottom: 8px; }
.toolbar .search { max-width: none; margin: 0; }
@media (max-width: 720px) { .toolbar { grid-template-columns: 1fr; } }
.table-wrap { overflow-x: auto; margin: 0 -22px -22px; padding: 0 22px 22px; }
.table { width: 100%; border-collapse: collapse; min-width: 680px; font-size: .94rem; }
.table th { text-align: left; font-weight: 600; color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .03em; padding: 10px 8px; border-bottom: 1px solid var(--border); }
.table td { padding: 12px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table td small { display: block; color: var(--muted); font-size: .82rem; }
.table .t-progress { min-width: 120px; }
.table .t-progress span { display: block; font-weight: 600; margin-bottom: 4px; }
.table .t-num { white-space: nowrap; }
.table .t-actions { text-align: right; }
.table tr.is-blocked td { opacity: .55; }
.detail-row td { background: var(--surface-2); }
.link-btn { background: none; border: 0; padding: 0; color: var(--text); font: inherit; cursor: pointer; text-align: left; }
.link-btn:hover { color: var(--primary); text-decoration: underline; }
.detail-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.detail-list li { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.badge--warn { background: var(--warn-soft); color: var(--warn); }
.branch-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.branch-list small { display: block; color: var(--muted); margin-bottom: 4px; }

.modal {
  border: 1px solid var(--border); border-radius: 20px; padding: 0; width: min(560px, calc(100% - 32px));
  background: var(--surface); color: var(--text); box-shadow: var(--shadow);
}
.modal::backdrop { background: rgba(8, 24, 31, .5); }
.modal__body { padding: 24px; max-height: calc(100vh - 64px); overflow-y: auto; }
.modal__body h2 { margin-bottom: 16px; }
.danger-zone { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.cred-list { max-height: 260px; overflow-y: auto; padding-left: 1.2em; font-size: .92rem; }