/* CardioAI — сине-фиолетовая тема. Без фреймворков и сборки. */

:root {
  --blue-50: #eef3ff;
  --blue-100: #dce6ff;
  --blue-500: #3d6cf2;
  --blue-600: #2f55e6;
  --blue-700: #2443c4;
  --violet-50: #f4f0ff;
  --violet-100: #e7deff;
  --violet-500: #8358ef;
  --violet-600: #6f40e0;
  --violet-700: #5a2fc2;

  --ink-900: #17163a;
  --ink-700: #36355f;
  --ink-500: #62628b;
  --ink-300: #a5a6c6;

  --bg: #f4f5fd;
  --surface: #ffffff;
  --surface-2: #f8f8ff;
  --border: #e0e2f4;

  --success: #0c8a62;
  --success-bg: #e2f6ee;
  --danger: #c52f55;
  --danger-bg: #fde9ee;
  --warn: #9a5b00;
  --warn-bg: #fff2d9;

  --info-text: #1f3a9c;
  --success-text: #075c42;
  --danger-text: #96203f;
  --success-border: #b9e8d6;
  --danger-border: #f1bccb;
  --warn-border: #f1d9a0;
  --accent-border: #c8b9fa;
  --input-border: #c9cde8;
  --border-strong: #c9d2f5;
  --muted-bg: #ecedf7;
  --locked-bg: #eeeff7;
  --locked-border: #d8daea;
  --track: #e6e8f6;
  --header-bg: rgba(255, 255, 255, 0.92);
  --sticky-bg: rgba(255, 255, 255, 0.95);
  --code-bg: #1c1a44;
  color-scheme: light;

  --grad: linear-gradient(135deg, #2f55e6 0%, #7a45e8 100%);
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(31, 35, 90, 0.05), 0 8px 24px rgba(31, 35, 90, 0.07);
  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Roboto, Arial, sans-serif;
  --font-mono: "Cascadia Code", "JetBrains Mono", Consolas, "SFMono-Regular", Menlo, monospace;
}

/* Тёмная тема: выбор пользователя (data-theme) или, без него, настройка системы. */
:root[data-theme="dark"] {
  color-scheme: dark;
  --blue-50: #1a2250;
  --blue-100: #26306b;
  --blue-500: #6f8dff;
  --blue-600: #8aa6ff;
  --blue-700: #a9bdff;
  --violet-50: #221a48;
  --violet-100: #30245f;
  --violet-500: #a07cf7;
  --violet-600: #b796ff;
  --violet-700: #cdb6ff;
  --ink-900: #ebebfb;
  --ink-700: #c6c7e8;
  --ink-500: #9c9dc6;
  --ink-300: #5d5f8c;
  --bg: #0e0f23;
  --surface: #171933;
  --surface-2: #1d1f3e;
  --border: #2b2e56;
  --success: #43d19e;
  --success-bg: #10332a;
  --danger: #ff7d9d;
  --danger-bg: #3a1526;
  --warn: #f3bb4f;
  --warn-bg: #36290e;
  --info-text: #b7c7ff;
  --success-text: #8ce8c4;
  --danger-text: #ffb3c6;
  --success-border: #1f5a47;
  --danger-border: #6a2a42;
  --warn-border: #6a5221;
  --accent-border: #4d3a8f;
  --input-border: #3a3d6c;
  --border-strong: #3d4380;
  --muted-bg: #262949;
  --locked-bg: #1f2140;
  --locked-border: #33365f;
  --track: #2a2d52;
  --header-bg: rgba(23, 25, 51, 0.92);
  --sticky-bg: rgba(23, 25, 51, 0.95);
  --code-bg: #12132c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --blue-50: #1a2250;
    --blue-100: #26306b;
    --blue-500: #6f8dff;
    --blue-600: #8aa6ff;
    --blue-700: #a9bdff;
    --violet-50: #221a48;
    --violet-100: #30245f;
    --violet-500: #a07cf7;
    --violet-600: #b796ff;
    --violet-700: #cdb6ff;
    --ink-900: #ebebfb;
    --ink-700: #c6c7e8;
    --ink-500: #9c9dc6;
    --ink-300: #5d5f8c;
    --bg: #0e0f23;
    --surface: #171933;
    --surface-2: #1d1f3e;
    --border: #2b2e56;
    --success: #43d19e;
    --success-bg: #10332a;
    --danger: #ff7d9d;
    --danger-bg: #3a1526;
    --warn: #f3bb4f;
    --warn-bg: #36290e;
    --info-text: #b7c7ff;
    --success-text: #8ce8c4;
    --danger-text: #ffb3c6;
    --success-border: #1f5a47;
    --danger-border: #6a2a42;
    --warn-border: #6a5221;
    --accent-border: #4d3a8f;
    --input-border: #3a3d6c;
    --border-strong: #3d4380;
    --muted-bg: #262949;
    --locked-bg: #1f2140;
    --locked-border: #33365f;
    --track: #2a2d52;
    --header-bg: rgba(23, 25, 51, 0.92);
    --sticky-bg: rgba(23, 25, 51, 0.95);
    --code-bg: #12132c;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink-900);
  font: 16px/1.6 var(--font);
}

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5em; letter-spacing: -0.01em; text-wrap: balance; }
h1 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.2rem); }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.08rem; }
p { margin: 0 0 1em; }

a { color: var(--blue-600); text-underline-offset: 3px; }
a:hover { color: var(--violet-600); }

:focus-visible { outline: 3px solid var(--violet-500); outline-offset: 2px; border-radius: 4px; }

code { font-family: var(--font-mono); font-size: 0.92em; }
/* Без лигатур: в коде должно быть видно, что набрано именно <=, а не символ ≤. */
code, pre, .editor .CodeMirror, .editor .CodeMirror pre.CodeMirror-line, .editor .CodeMirror pre.CodeMirror-line-like {
  font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0;
}

.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.container.narrow { max-width: 640px; }
.container.narrow-wide { max-width: 920px; }
.sandbox-link { margin: -8px 0 16px; }
.muted { color: var(--ink-500); }
.small { font-size: 0.875rem; }
.icon { flex: none; vertical-align: -0.18em; }
.inline-form { display: inline; margin: 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.eyebrow {
  margin: 0 0 0.4em; font-size: 0.8rem; font-weight: 650; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--violet-600);
}

/* --- Шапка и подвал --- */

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--header-bg); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 62px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink-900); }
.brand-name { font-size: 1.25rem; font-weight: 750; letter-spacing: -0.02em; }
.brand-accent { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.site-nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.site-nav > a:not(.btn) {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 999px;
  color: var(--ink-700); text-decoration: none; font-weight: 550;
}
.site-nav > a:not(.btn):hover { background: var(--blue-50); color: var(--blue-700); }
.site-nav > a[aria-current="page"] { background: var(--violet-50); color: var(--violet-700); }
.theme-toggle {
  display: inline-grid; place-items: center; width: 36px; height: 36px; padding: 0;
  border: 1px solid var(--border); border-radius: 50%; background: var(--surface); color: var(--ink-700); cursor: pointer;
}
.theme-toggle:hover { background: var(--blue-50); color: var(--blue-700); }
.theme-toggle .icon-sun, :root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

.site-main { flex: 1; padding: 28px 0 56px; }
.page-landing .site-main { padding-top: 0; }

.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 20px 0; font-size: 0.875rem; }
.footer-inner p { margin: 0 0 4px; }

/* --- Кнопки --- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border: 1px solid transparent; border-radius: 10px;
  font: inherit; font-weight: 600; line-height: 1.3; text-decoration: none; cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.05s;
}
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 6px 12px; font-size: 0.9rem; border-radius: 8px; }
.btn-lg { padding: 13px 24px; font-size: 1.05rem; border-radius: 12px; }
.btn-block { width: 100%; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 4px 14px rgba(77, 70, 230, 0.28); }
.btn-primary:hover { color: #fff; box-shadow: 0 6px 20px rgba(77, 70, 230, 0.4); }
.btn-secondary { background: var(--surface); color: var(--blue-700); border-color: var(--border-strong); }
.btn-secondary:hover { background: var(--blue-50); color: var(--blue-700); }
.btn-ghost { background: transparent; color: var(--ink-700); }
.btn-ghost:hover { background: var(--blue-50); color: var(--blue-700); }
.btn-danger { background: var(--surface); color: var(--danger); border-color: var(--danger-border); }
.btn-danger:hover { background: var(--danger-bg); color: var(--danger); }
/* Белая кнопка стоит на градиенте, поэтому её цвета не зависят от темы. */
.btn-light { background: #fff; color: #5a2fc2; }
.btn-light:hover { background: #f4f0ff; color: #5a2fc2; }
.btn-outline-light { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.6); }
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.14); color: #fff; }
.btn.is-disabled, .btn:disabled { opacity: 0.5; pointer-events: none; box-shadow: none; }

/* --- Формы --- */

.form { display: grid; gap: 16px; }
.field { display: grid; gap: 6px; }
.field > span:first-child { font-weight: 600; font-size: 0.93rem; }
.field input, .field select {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--ink-900);
  background: var(--surface); border: 1px solid var(--input-border); border-radius: var(--radius-sm);
}
.field input:focus { border-color: var(--violet-500); outline: 3px solid rgba(131, 88, 239, 0.22); outline-offset: 0; }
.field input:disabled { background: var(--surface-2); color: var(--ink-500); }
.field-hint { color: var(--ink-500); font-size: 0.84rem; }
.field-error { color: var(--danger); font-size: 0.875rem; font-weight: 550; }
.field.has-error input { border-color: var(--danger); }
.form-row { grid-template-columns: 1fr 1.4fr 180px auto; align-items: end; }
.consent { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: start; font-size: 0.9rem; color: var(--ink-700); }
.consent input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--violet-600); }
.consent.has-error span { color: var(--danger); }
textarea {
  width: 100%; min-height: 120px; padding: 10px 12px; font: inherit; color: var(--ink-900); resize: vertical;
  background: var(--surface); border: 1px solid var(--input-border); border-radius: var(--radius-sm);
}
textarea.code-input { font-family: var(--font-mono); font-size: 0.9rem; min-height: 220px; }
.rating { display: flex; gap: 8px; flex-wrap: wrap; border: 0; padding: 0; margin: 0; }
.rating label { display: grid; place-items: center; min-width: 44px; height: 44px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer; font-weight: 700; }
.rating label:has(input:checked) { background: var(--violet-100); border-color: var(--violet-500); color: var(--violet-700); }
.rating input { position: absolute; opacity: 0; pointer-events: none; }
.status-badge-submitted { background: var(--blue-50); color: var(--blue-700); }
.teacher-comment { margin-top: 12px; padding: 12px 16px; border-left: 4px solid var(--violet-500); background: var(--violet-50); border-radius: var(--radius-sm); }

.alert { padding: 12px 16px; border-radius: var(--radius-sm); border: 1px solid transparent; margin-bottom: 16px; }
.alert-info { background: var(--blue-50); border-color: var(--blue-100); color: var(--info-text); }
.alert-success { background: var(--success-bg); border-color: var(--success-border); color: var(--success-text); }
.alert-danger { background: var(--danger-bg); border-color: var(--danger-border); color: var(--danger-text); }
.flashes { margin-bottom: 4px; }

/* --- Карточки и значки --- */

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px 24px; margin-bottom: 20px;
}
.badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 999px;
  font-size: 0.8rem; font-weight: 650; white-space: nowrap;
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-muted { background: var(--muted-bg); color: var(--ink-500); }
.badge-accent { background: var(--violet-100); color: var(--violet-700); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }

.tag {
  display: inline-flex; align-items: center; gap: 5px; padding: 2px 9px; border-radius: 999px;
  background: var(--blue-50); color: var(--blue-700); font-size: 0.8rem; font-weight: 600; white-space: nowrap;
}
.tag-practice { background: var(--violet-100); color: var(--violet-700); }
.tag-time { background: transparent; color: var(--ink-500); padding-left: 2px; }
.tag-success { background: var(--success-bg); color: var(--success); }
.tag-warn { background: var(--warn-bg); color: var(--warn); }

/* --- Лендинг --- */

.hero { background: var(--grad); color: #fff; position: relative; overflow: hidden; }
.hero-inner { position: relative; padding-top: 72px; padding-bottom: 96px; }
.hero-text { position: relative; z-index: 1; max-width: 720px; }
.hero .eyebrow { color: #d9d2ff; }
.hero h1 { font-size: clamp(2rem, 1.3rem + 3vw, 3.2rem); margin-bottom: 0.4em; }
.hero-lead { font-size: 1.15rem; color: #e9e6ff; max-width: 620px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-ecg {
  position: absolute; right: -40px; bottom: 0; width: min(720px, 90%); height: 220px;
  color: rgba(255, 255, 255, 0.16); pointer-events: none;
}

.stats-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  margin-top: -44px; position: relative; z-index: 2;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.stats-row-plain { margin: 20px 0; }
.stat { padding: 20px 22px; display: grid; gap: 2px; border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat-value {
  font-size: 2rem; font-weight: 750; line-height: 1.1; letter-spacing: -0.02em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label { color: var(--ink-500); font-size: 0.92rem; }

.section-block { margin-top: 56px; }
.section-block > h2 { font-size: 1.6rem; margin-bottom: 20px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dataset-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 12px; }
.feature, .dataset {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.feature p, .dataset p { margin: 0; color: var(--ink-700); }
.feature-icon {
  display: grid; place-items: center; width: 44px; height: 44px; margin-bottom: 14px; flex: none;
  border-radius: 12px; background: var(--violet-100); color: var(--violet-700);
}

.program { display: grid; gap: 12px; }
.program-item {
  display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px;
}
.program-item p { margin: 0 0 4px; color: var(--ink-700); }
.program-number, .section-number {
  display: grid; place-items: center; width: 42px; height: 42px; flex: none;
  border-radius: 12px; background: var(--grad); color: #fff; font-weight: 750; font-size: 1.1rem;
}
.cta {
  margin-top: 56px; text-align: center; padding: 44px 24px;
  background: linear-gradient(135deg, var(--blue-50), var(--violet-50));
  border: 1px solid var(--border); border-radius: var(--radius);
}
.cta p { color: var(--ink-700); }

/* --- Авторизация --- */

.auth-wrap { display: grid; place-items: start center; padding-top: 24px; }
.auth-card {
  position: relative; overflow: hidden;
  width: 100%; max-width: 460px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 18px; box-shadow: var(--shadow); padding: 36px 32px 32px;
}
.auth-card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 5px; background: var(--grad); }
.auth-card h1 { font-size: 1.6rem; }
.auth-links { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin: 18px 0 0; font-size: 0.93rem; }
.profile-meta { display: grid; gap: 8px; margin: 20px 0 0; }
.profile-meta div { display: flex; justify-content: space-between; gap: 16px; border-bottom: 1px dashed var(--border); padding-bottom: 6px; }
.profile-meta dt { color: var(--ink-500); }
.profile-meta dd { margin: 0; font-weight: 600; text-align: right; }

/* --- Карта курса --- */

.progress-hero {
  display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center;
  background: var(--grad); color: #fff; border-radius: 20px; padding: 32px 36px; margin-bottom: 24px;
  box-shadow: 0 12px 32px rgba(77, 70, 230, 0.25);
}
.progress-hero .eyebrow { color: #d9d2ff; }
.progress-hero h1 { font-size: clamp(1.4rem, 1.1rem + 1.4vw, 2rem); }
.progress-hero p { color: #ebe8ff; max-width: 560px; }
.progress-ring {
  --value: 0;
  width: 132px; height: 132px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(#fff calc(var(--value) * 1%), rgba(255, 255, 255, 0.22) 0);
}
.progress-ring span {
  display: grid; place-items: center; width: 104px; height: 104px; border-radius: 50%;
  background: #5a48e6; font-size: 1.7rem; font-weight: 750;
}

.section-list { display: grid; gap: 14px; }
.section-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.section-card > summary {
  display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: center;
  padding: 18px 22px; cursor: pointer; list-style: none; border-radius: var(--radius);
}
.section-card > summary::-webkit-details-marker { display: none; }
.section-head { display: grid; gap: 2px; min-width: 0; }
.section-title { font-size: 1.12rem; font-weight: 700; }
.section-desc { color: var(--ink-500); font-size: 0.92rem; }
.section-card.is-locked .section-number { background: var(--locked-border); }
.section-card.is-locked .section-title { color: var(--ink-500); }

.lesson-list { list-style: none; margin: 0; padding: 0 12px 12px; }
.lesson-row { border-top: 1px solid var(--border); }
.lesson-link {
  display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center;
  padding: 12px 10px; border-radius: 10px; color: inherit; text-decoration: none;
}
a.lesson-link:hover { background: var(--blue-50); color: inherit; }
.lesson-title { font-weight: 550; }
.lesson-tags { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 0; }
.lesson-status {
  display: grid; place-items: center; width: 30px; height: 30px; flex: none; border-radius: 50%;
  background: var(--blue-50); color: var(--blue-700); font-size: 0.85rem; font-weight: 700;
  border: 2px solid var(--blue-500);
}
.is-done .lesson-status { background: var(--success); border-color: var(--success); color: #fff; }
.is-locked .lesson-status { background: var(--locked-bg); border-color: var(--locked-border); color: var(--ink-300); }
.is-locked .lesson-title, .is-locked .sidebar-link { color: var(--ink-500); }
.lesson-row-quiz .lesson-title { font-weight: 700; }
.lesson-row-quiz.is-open .lesson-status { background: var(--violet-100); border-color: var(--violet-500); color: var(--violet-700); }

.certificate-teaser {
  display: flex; gap: 18px; align-items: flex-start; margin-top: 24px; padding: 22px 24px;
  background: var(--surface); border: 1px dashed var(--input-border); border-radius: var(--radius);
}
.certificate-teaser h2 { font-size: 1.12rem; }
.certificate-teaser p { color: var(--ink-700); margin-bottom: 8px; }
.certificate-teaser.is-ready { border-style: solid; border-color: var(--accent-border); background: var(--violet-50); }

/* --- Урок --- */

.lesson-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 32px; align-items: start; }
.lesson-sidebar {
  position: sticky; top: 84px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; max-height: calc(100vh - 104px); overflow-y: auto;
}
.sidebar-back {
  display: inline-flex; align-items: center; gap: 6px; margin-bottom: 12px;
  font-size: 0.9rem; font-weight: 600; text-decoration: none;
}
.sidebar-section { margin: 0; font-size: 0.78rem; font-weight: 650; letter-spacing: 0.06em; text-transform: uppercase; color: var(--violet-600); }
.sidebar-title { font-size: 1.02rem; margin-bottom: 12px; }
.sidebar-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.sidebar-link {
  display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: center;
  padding: 7px 8px; border-radius: 9px; color: var(--ink-700); text-decoration: none; font-size: 0.93rem; line-height: 1.35;
}
a.sidebar-link:hover { background: var(--blue-50); color: var(--ink-900); }
.sidebar-list .lesson-status { width: 24px; height: 24px; font-size: 0.75rem; }
.sidebar-list .is-current .sidebar-link { background: var(--violet-50); color: var(--violet-700); font-weight: 650; }

.lesson-main { min-width: 0; }
.lesson-header { margin-bottom: 24px; }
.lesson-header h1 { margin-bottom: 0.35em; }
.lesson-footer {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--border);
}

.prose {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 36px; box-shadow: var(--shadow); font-size: 1.04rem; line-height: 1.7;
  overflow-wrap: break-word;
}
.prose > :first-child { margin-top: 0; }
.prose > :last-child { margin-bottom: 0; }
.prose h2 { font-size: 1.4rem; margin: 1.8em 0 0.6em; padding-bottom: 0.3em; border-bottom: 2px solid var(--violet-100); }
.prose h3 { font-size: 1.14rem; margin: 1.5em 0 0.5em; }
.prose p, .prose ul, .prose ol { max-width: 74ch; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1em; }
.prose li { margin-bottom: 0.3em; }
.prose li::marker { color: var(--violet-600); font-weight: 650; }
.prose :not(pre) > code {
  background: var(--violet-50); color: var(--violet-700); padding: 0.1em 0.38em; border-radius: 5px;
}
.prose img { display: block; max-width: 100%; height: auto; margin: 1.2em 0; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.prose blockquote { margin: 1em 0; padding: 0.2em 1.1em; border-left: 4px solid var(--violet-500); color: var(--ink-700); }
.prose table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.95rem; display: block; overflow-x: auto; }
.prose th, .prose td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; vertical-align: top; }
.prose thead th { background: var(--blue-50); color: var(--blue-700); font-weight: 650; }

pre { margin: 0; }
pre.highlight, pre.output {
  margin: 1em 0; padding: 14px 16px; border-radius: var(--radius-sm);
  font: 0.88rem/1.6 var(--font-mono); overflow-x: auto; tab-size: 4;
}
pre.highlight { background: var(--code-bg); color: #e6e7ff; }
pre.output {
  background: var(--surface-2); color: var(--ink-700); border: 1px solid var(--border);
  border-left: 4px solid var(--blue-500); white-space: pre-wrap;
}
pre.highlight + pre.output { margin-top: -0.6em; }
pre code { font-size: inherit; background: none; padding: 0; color: inherit; }

/* Подсветка Pygments на тёмном фоне */
.highlight .k, .highlight .kn, .highlight .kd, .highlight .kr, .highlight .ow { color: #c4a7ff; }
.highlight .kc, .highlight .bp { color: #ffb3d1; }
.highlight .nb, .highlight .nc, .highlight .ne { color: #8fd3ff; }
.highlight .nf, .highlight .fm { color: #9fb4ff; }
.highlight .nn { color: #e6e7ff; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sa, .highlight .sd, .highlight .se, .highlight .si { color: #a8e6a1; }
.highlight .m, .highlight .mi, .highlight .mf { color: #ffcf8a; }
.highlight .c, .highlight .c1, .highlight .cm { color: #9a9bc4; font-style: italic; }
.highlight .o, .highlight .p { color: #c9caec; }

.callout { margin: 1.4em 0; padding: 14px 18px; border-radius: var(--radius-sm); border-left: 4px solid; }
.callout > :last-child { margin-bottom: 0; }
.callout-title { font-weight: 700; margin-bottom: 4px; font-size: 0.95rem; }
.callout-note { background: var(--blue-50); border-color: var(--blue-500); }
.callout-note .callout-title { color: var(--blue-700); }
.callout-clinic { background: var(--violet-50); border-color: var(--violet-500); }
.callout-clinic .callout-title { color: var(--violet-700); }
.callout-warning { background: var(--warn-bg); border-color: var(--warn); }
.callout-warning .callout-title { color: var(--warn); }
.callout-summary { background: var(--success-bg); border-color: var(--success); }
.callout-summary .callout-title { color: var(--success); }

/* --- Практика --- */

.practice-layout { max-width: 1400px; }
.practice-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 24px; align-items: start; }
.practice-statement { padding: 24px 26px; font-size: 1rem; position: sticky; top: 84px; max-height: calc(100vh - 104px); overflow-y: auto; }
.practice-work { min-width: 0; display: grid; gap: 14px; }
.editor-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.toolbar-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.runtime-status { font-size: 0.88rem; color: var(--ink-500); display: inline-flex; align-items: center; gap: 8px; }
.runtime-status::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--ink-300); }
.runtime-status[data-state="loading"]::before { background: #e0a100; animation: pulse 1s infinite; }
.runtime-status[data-state="ready"]::before { background: var(--success); }
.runtime-status[data-state="error"]::before { background: var(--danger); }
@keyframes pulse { 50% { opacity: 0.3; } }

.editor { border-radius: var(--radius-sm); overflow: hidden; border: 1px solid #2b2960; }
.editor .CodeMirror { height: auto; min-height: 320px; font: 0.9rem/1.6 var(--font-mono); background: var(--code-bg); color: #e6e7ff; }
.editor .CodeMirror-scroll { min-height: 320px; max-height: 620px; }
.editor .CodeMirror-gutters { background: var(--code-bg); border-right: 1px solid #312f6b; }
.editor .CodeMirror-linenumber { color: #7475a8; }
.editor .CodeMirror-cursor { border-left-color: #fff; }
.editor .CodeMirror-selected { background: #3a3785; }
.editor .CodeMirror-focused .CodeMirror-selected { background: #45419a; }
.editor .CodeMirror-matchingbracket { color: #fff !important; background: #45419a; }
.editor .cm-s-default .cm-keyword, .editor .cm-s-default .cm-operator.cm-keyword { color: #c4a7ff; }
.editor .cm-s-default .cm-builtin { color: #8fd3ff; }
.editor .cm-s-default .cm-def { color: #9fb4ff; }
.editor .cm-s-default .cm-string { color: #a8e6a1; }
.editor .cm-s-default .cm-number { color: #ffcf8a; }
.editor .cm-s-default .cm-comment { color: #9a9bc4; font-style: italic; }
.editor .cm-s-default .cm-variable, .editor .cm-s-default .cm-variable-2, .editor .cm-s-default .cm-property { color: #e6e7ff; }
.editor .cm-s-default .cm-operator { color: #c9caec; }
.editor-hint { margin: -6px 0 0; }

.output-panel, .checks-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px;
}
.output-panel h2, .checks-panel h2 { font-size: 0.95rem; margin-bottom: 8px; color: var(--ink-700); }
.output-panel pre.output { margin: 0; max-height: 360px; overflow: auto; }
pre.output.is-error { border-left-color: var(--danger); color: var(--danger-text); background: var(--danger-bg); }
.plots { display: grid; gap: 10px; margin-top: 10px; }
.plots:empty { display: none; }
.plots img { max-width: 100%; height: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }

.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.checks li { display: grid; grid-template-columns: auto 1fr; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); }
.checks li.is-ok { background: var(--success-bg); color: var(--success-text); }
.checks li.is-fail { background: var(--danger-bg); color: var(--danger-text); }
.checks .check-label { font-weight: 650; }
.checks .check-message { display: block; font-size: 0.93rem; margin-top: 2px; }
.checks-summary { margin: 12px 0 0; font-weight: 650; }

/* --- Тест --- */

.quiz-form { display: grid; gap: 16px; }
.question {
  margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; min-width: 0;
}
.question legend, .question h3 {
  display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start;
  padding: 0; margin: 0 0 12px; font-size: 1.04rem; font-weight: 650;
}
/* legend по умолчанию «врезается» в рамку fieldset; float возвращает его в обычный поток. */
.question legend { float: left; width: 100%; }
.question legend + * { clear: both; }
.question-number {
  display: grid; place-items: center; min-width: 30px; height: 30px; padding: 0 6px; border-radius: 9px;
  background: var(--violet-100); color: var(--violet-700); font-size: 0.9rem; font-weight: 750;
}
.question-note { margin: 0 0 10px 42px; font-size: 0.82rem; font-weight: 650; color: var(--violet-600); text-transform: uppercase; letter-spacing: 0.04em; }
.options { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.option {
  display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start;
  padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer;
}
.option:hover { border-color: var(--accent-border); background: var(--surface-2); }
.option input { width: 18px; height: 18px; margin: 4px 0 0; accent-color: var(--violet-600); }
.option:has(input:checked) { border-color: var(--violet-500); background: var(--violet-50); }
.quiz-submit {
  position: sticky; bottom: 0; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 14px 18px; background: var(--sticky-bg); backdrop-filter: blur(6px);
  border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}

.result-card {
  display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: center;
  padding: 26px 30px; border-radius: 18px; margin-bottom: 28px; border: 1px solid;
}
.result-card.is-passed { background: var(--success-bg); border-color: var(--success-border); }
.result-card.is-failed { background: var(--warn-bg); border-color: var(--warn-border); }
.result-score { display: grid; justify-items: center; }
.result-value { font-size: 2.6rem; font-weight: 750; line-height: 1; }
.result-value small { font-size: 1.2rem; font-weight: 600; color: var(--ink-500); }
.result-percent { font-weight: 700; color: var(--ink-700); }
.result-text p { margin-bottom: 10px; }
.block-title { margin: 28px 0 12px; }
.review { margin-bottom: 14px; }
.review.is-wrong { border-color: var(--danger-border); }
.review .option { cursor: default; }
.review .option:hover { background: none; border-color: var(--border); }
.review .option.is-correct { border-color: var(--success-border); background: var(--success-bg); }
.review .option.is-chosen:not(.is-correct) { border-color: var(--danger-border); background: var(--danger-bg); }
.option-mark { display: grid; place-items: center; width: 20px; height: 20px; margin-top: 3px; }
.is-correct .option-mark { color: var(--success); }
.is-chosen:not(.is-correct) .option-mark { color: var(--danger); }
.explanation { margin: 12px 0 0; padding: 10px 14px; background: var(--blue-50); border-radius: var(--radius-sm); font-size: 0.96rem; }
.wrong-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.wrong-list li {
  display: grid; gap: 6px; padding: 14px 18px; background: var(--surface);
  border: 1px solid var(--border); border-left: 4px solid var(--danger); border-radius: var(--radius-sm);
}
.wrong-list a { font-size: 0.92rem; font-weight: 600; text-decoration: none; }

/* --- Состояния и ошибки --- */

.state-card {
  display: grid; justify-items: center; gap: 10px; text-align: center; margin-top: 32px; padding: 44px 32px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow);
}
.state-card p { color: var(--ink-700); max-width: 46ch; }
.state-card .profile-meta { width: 100%; text-align: left; }
.state-icon { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 50%; background: var(--violet-100); color: var(--violet-700); }
.state-icon-warn { background: var(--warn-bg); color: var(--warn); }
.state-icon-success { background: var(--success-bg); color: var(--success); }
.error-code {
  margin: 0; font-size: 4rem; font-weight: 800; line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* --- Сертификат --- */

.certificate-actions { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.certificate {
  max-width: 900px; margin: 0 auto; padding: 14px; border-radius: 18px;
  background: var(--grad); box-shadow: 0 16px 40px rgba(77, 70, 230, 0.25);
}
.certificate-inner {
  /* Сертификат — документ для печати: в любой теме он светлый. */
  --ink-900: #17163a; --ink-500: #62628b; --border: #e0e2f4; --violet-100: #e7deff;
  background: #fff; color: var(--ink-900); border-radius: 8px; padding: 48px 56px; text-align: center;
}
.certificate-brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.certificate-brand .brand-name { font-size: 1.7rem; }
.certificate-kind { margin: 0; font-size: 2.4rem; font-weight: 750; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-900); }
.certificate-line { margin: 14px 0 6px; color: var(--ink-500); }
.certificate-name {
  margin: 0; font-size: clamp(1.6rem, 1.2rem + 2vw, 2.4rem); font-weight: 750;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.certificate-course { margin: 0 0 24px; font-size: 1.3rem; font-weight: 700; }
.certificate-scores { margin: 0 auto 28px; border-collapse: collapse; font-size: 0.95rem; text-align: left; }
.certificate-scores th { font-weight: 500; padding: 5px 28px 5px 0; }
.certificate-scores td { font-weight: 700; padding: 5px 0; text-align: right; white-space: nowrap; }
.certificate-scores tr + tr th, .certificate-scores tr + tr td { border-top: 1px dashed var(--border); }
.certificate-footer { display: grid; grid-template-columns: repeat(3, auto); justify-content: space-between; gap: 16px; padding-top: 20px; border-top: 2px solid var(--violet-100); text-align: left; font-size: 0.88rem; }
.certificate-footer div { display: grid; gap: 2px; }
.certificate-footer strong { overflow-wrap: anywhere; }

/* --- Администрирование --- */

.tabs { display: flex; gap: 6px; margin-bottom: 8px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.tabs a {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 14px; margin-bottom: -1px;
  color: var(--ink-700); font-weight: 600; text-decoration: none; border-bottom: 3px solid transparent;
}
.tabs a:hover { color: var(--blue-700); }
.tabs a[aria-current="page"] { color: var(--violet-700); border-bottom-color: var(--violet-600); }
.table-filter { max-width: 360px; margin-bottom: 14px; }
.tabs-sub { margin: 12px 0 20px; }
.reflection-answers dt { font-weight: 600; margin-top: 8px; }
.reflection-answers dd { margin: 2px 0 0; color: var(--ink-700); }
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 16px; }
.table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.table th, .table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.table thead th { background: var(--surface-2); color: var(--ink-500); font-size: 0.8rem; font-weight: 650; letter-spacing: 0.04em; text-transform: uppercase; white-space: nowrap; }
.table tbody tr:last-child td { border-bottom: 0; }
.table-compact th, .table-compact td { padding: 8px 14px; }
.table-link { display: block; font-weight: 650; text-decoration: none; }
.table td .muted { display: block; }
.table tr.is-void td { color: var(--ink-300); }
.bar { width: 120px; height: 8px; border-radius: 999px; background: var(--track); overflow: hidden; display: inline-block; vertical-align: middle; margin-right: 8px; }
.bar span { display: block; height: 100%; background: var(--grad); border-radius: 999px; }
.page-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: flex-start; margin-bottom: 16px; }
.page-head h1 { margin-bottom: 0.2em; }
.page-head-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.actions-card { display: flex; gap: 10px; flex-wrap: wrap; }
.card h3 { margin-top: 18px; }
.code-details summary { cursor: pointer; color: var(--blue-600); font-weight: 600; }
.code-details pre.output { margin: 8px 0 0; max-width: 560px; max-height: 320px; overflow: auto; white-space: pre; }
.temp-password { font-size: 1.15rem; padding: 2px 8px; background: var(--surface); border-radius: 6px; user-select: all; }

/* --- Адаптивность --- */

@media (max-width: 1000px) {
  .lesson-layout { grid-template-columns: 1fr; gap: 16px; }
  .lesson-sidebar { position: static; max-height: none; }
  .practice-grid { grid-template-columns: 1fr; }
  .practice-statement { position: static; max-height: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .site-main { padding-top: 20px; }
  .header-inner { gap: 8px; }
  .brand-name { font-size: 1.1rem; }
  .site-nav { gap: 2px; }
  .site-nav > a:not(.btn) { padding: 7px 9px; }
  .nav-user span { display: none; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:nth-child(-n + 2) { border-bottom: 1px solid var(--border); }
  .dataset-grid { grid-template-columns: 1fr; }
  .hero-inner { padding-top: 48px; padding-bottom: 80px; }
  .progress-hero { grid-template-columns: 1fr; padding: 24px; }
  .progress-ring { width: 96px; height: 96px; }
  .progress-ring span { width: 74px; height: 74px; font-size: 1.25rem; }
  .section-card > summary { grid-template-columns: auto 1fr; padding: 16px; }
  .section-meta { grid-column: 2; }
  .lesson-link { grid-template-columns: auto 1fr; }
  .lesson-tags { grid-column: 2; }
  .prose { padding: 22px 18px; font-size: 1rem; }
  .auth-card { padding: 24px 20px; }
  .result-card { grid-template-columns: 1fr; text-align: center; }
  .certificate-inner { padding: 28px 20px; }
  .certificate-kind { font-size: 1.6rem; }
  .certificate-footer { grid-template-columns: 1fr; }
  .quiz-submit { flex-direction: column; align-items: stretch; text-align: center; }
  .lesson-footer { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .brand-name { display: none; }
  .site-nav .btn-sm { padding: 6px 10px; }
}

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

/* --- Печать сертификата --- */

@media print {
  @page { size: A4 landscape; margin: 10mm; }
  body { background: #fff; }
  .site-header, .site-footer, .no-print, .flashes { display: none !important; }
  .site-main { padding: 0; }
  .certificate { box-shadow: none; max-width: none; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .certificate-inner { padding: 28px 44px; }
  .certificate-name, .brand-accent { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}