/* ========== Курс по Dify — дизайн-система ========== */
@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@400;500;600;700;800&family=Onest:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --paper: #F6F3EC;
  --paper-deep: #EFEAE0;
  --card: #FFFFFF;
  --ink: #16161E;
  --ink-soft: #4A4A57;
  --ink-faint: #8A8A96;
  --line: #E3DDD0;
  --accent: #2B4EFF;
  --accent-deep: #1B35C0;
  --accent-soft: #E8ECFF;
  --coral: #FF5A3C;
  --coral-soft: #FFE9E4;
  --mint: #0FA678;
  --mint-soft: #E1F5EE;
  --amber: #B87700;
  --amber-soft: #FFF3D6;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 2px 6px rgba(22, 22, 30, .05), 0 12px 32px rgba(22, 22, 30, .07);
  --font-display: 'Unbounded', system-ui, sans-serif;
  --font-body: 'Onest', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* фоновая сетка-миллиметровка */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: .35;
  pointer-events: none;
  z-index: 0;
}

.page { position: relative; z-index: 1; }

/* ========== Шапка ========== */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246, 243, 236, .88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; gap: 16px;
}
.brand {
  font-family: var(--font-display);
  font-weight: 700; font-size: 15px;
  text-decoration: none; color: var(--ink);
  display: flex; align-items: center; gap: 10px;
  white-space: nowrap;
}
.brand-dot {
  width: 12px; height: 12px; border-radius: 3px;
  background: var(--accent);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.topbar-progress {
  flex: 1; display: flex; align-items: center; gap: 12px;
  justify-content: flex-end;
}
.progress-track {
  width: 140px; height: 8px; border-radius: 99px;
  background: var(--paper-deep);
  overflow: hidden;
}
.progress-fill {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--accent), #6C86FF);
  width: 0%;
  transition: width .6s cubic-bezier(.22, 1, .36, 1);
}
.progress-label {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--ink-soft); white-space: nowrap;
}

/* ========== Контейнеры ========== */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; margin: 0 auto; padding: 0 24px; }

/* ========== Типографика ========== */
h1, h2, h3 { font-family: var(--font-display); line-height: 1.2; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 5vw, 52px); font-weight: 800; }
h2 { font-size: clamp(22px, 3vw, 30px); font-weight: 700; margin: 56px 0 18px; }
h3 { font-size: 18px; font-weight: 600; margin: 32px 0 12px; }
p { margin: 0 0 16px; color: var(--ink-soft); }
p strong, li strong { color: var(--ink); }
ul, ol { margin: 0 0 16px 24px; color: var(--ink-soft); }
li { margin-bottom: 8px; }
a { color: var(--accent-deep); }
code {
  font-family: var(--font-mono); font-size: .85em;
  background: var(--paper-deep); padding: 2px 7px; border-radius: 6px;
  color: var(--ink);
}
pre {
  background: var(--ink); color: #E8E8F0;
  border-radius: var(--radius-sm);
  padding: 18px 22px; overflow-x: auto;
  font-family: var(--font-mono); font-size: 13.5px; line-height: 1.7;
  margin: 0 0 20px;
}
pre code { background: none; color: inherit; padding: 0; }

.eyebrow {
  font-family: var(--font-mono); font-size: 12px;
  text-transform: uppercase; letter-spacing: .14em;
  color: var(--accent-deep);
  display: inline-flex; align-items: center; gap: 8px;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: ''; width: 24px; height: 2px; background: var(--accent);
}

/* ========== Герой главной ========== */
.hero { padding: 80px 0 48px; }
.hero h1 { margin-bottom: 20px; }
.hero h1 .accent { color: var(--accent); }
.hero-lead {
  font-size: 20px; max-width: 640px; color: var(--ink-soft);
  margin-bottom: 32px;
}
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 8px;
}
.chip {
  font-family: var(--font-mono); font-size: 12.5px;
  padding: 7px 14px; border-radius: 99px;
  background: var(--card); border: 1px solid var(--line);
  color: var(--ink-soft);
}

/* ========== Карточки-модули ========== */
.modules { padding: 24px 0 80px; }
.module-grid { display: grid; gap: 14px; }
.module-card {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  align-items: center; gap: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 26px;
  text-decoration: none; color: var(--ink);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.module-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.module-num {
  font-family: var(--font-display); font-weight: 800;
  font-size: 34px; color: var(--paper-deep);
  -webkit-text-stroke: 1.5px var(--accent);
  line-height: 1;
}
.module-card.done .module-num { color: var(--accent); -webkit-text-stroke: 0; }
.module-title { font-family: var(--font-display); font-weight: 600; font-size: 16.5px; margin-bottom: 5px; }
.module-desc { font-size: 14.5px; color: var(--ink-faint); line-height: 1.5; }
.module-status {
  font-family: var(--font-mono); font-size: 12px;
  padding: 6px 12px; border-radius: 99px;
  background: var(--paper-deep); color: var(--ink-faint);
  white-space: nowrap;
}
.module-card.done .module-status { background: var(--mint-soft); color: var(--mint); }
.module-card.locked { opacity: .55; cursor: default; }
.module-card.locked:hover { transform: none; box-shadow: none; border-color: var(--line); }
.module-card.locked .module-num { -webkit-text-stroke-color: var(--ink-faint); }

.hero-note {
  font-size: 14.5px; color: var(--ink-faint); max-width: 560px;
  margin-top: 18px; padding-top: 14px; border-top: 1px dashed var(--line);
}

/* ========== Страница урока ========== */
.lesson-head { padding: 64px 0 8px; }
.lesson-num {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(64px, 10vw, 110px);
  color: transparent; -webkit-text-stroke: 2px var(--accent);
  line-height: .9; margin-bottom: 8px;
}
.lesson-head h1 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 16px; }
.lesson-lead { font-size: 19px; max-width: 660px; }

.lesson-body { padding: 24px 0 40px; }

/* ========== Компоненты контента ========== */
.callout {
  border-radius: var(--radius-sm);
  padding: 18px 22px; margin: 24px 0;
  border: 1px solid var(--line);
  background: var(--card);
  display: grid; grid-template-columns: auto 1fr; gap: 14px;
  align-items: start;
}
.callout-icon { font-size: 20px; line-height: 1.4; }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout.idea { background: var(--accent-soft); border-color: #C9D4FF; }
.callout.warn { background: var(--amber-soft); border-color: #EDD9A3; }
.callout.practice { background: var(--mint-soft); border-color: #BCE5D6; }
.callout.case { background: var(--coral-soft); border-color: #FFCBBE; }
.callout-title { font-weight: 700; color: var(--ink); display: block; margin-bottom: 4px; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 24px 0; }
.info-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 20px 22px;
}
.info-card h4 {
  font-family: var(--font-display); font-size: 14.5px; font-weight: 600;
  margin-bottom: 8px; display: flex; align-items: center; gap: 8px;
}
.info-card p { font-size: 14.5px; margin: 0; }
.info-card .tag {
  display: inline-block; margin-top: 10px;
  font-family: var(--font-mono); font-size: 11px;
  padding: 3px 9px; border-radius: 99px;
  background: var(--accent-soft); color: var(--accent-deep);
}

table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
  background: var(--card); border-radius: var(--radius-sm);
  overflow: hidden; font-size: 14.5px;
  border: 1px solid var(--line);
}
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); background: var(--paper-deep); }
tr:last-child td { border-bottom: none; }
td { color: var(--ink-soft); }
td:first-child { color: var(--ink); font-weight: 600; }
.table-scroll { overflow-x: auto; }

.figure {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px;
  margin: 28px 0; overflow-x: auto;
}
.figure svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.figure-caption {
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint);
  text-align: center; margin-top: 14px;
}

/* ключевые выводы */
.takeaways {
  background: var(--ink); color: #E8E8F0;
  border-radius: var(--radius); padding: 30px 34px;
  margin: 48px 0 8px;
}
.takeaways h2 { color: #fff; margin: 0 0 18px; font-size: 20px; }
.takeaways ul { margin: 0 0 0 22px; color: #C9C9D6; }
.takeaways li::marker { color: var(--coral); }
.takeaways strong { color: #fff; }

/* ========== Квиз ========== */
.quiz {
  background: var(--card); border: 2px solid var(--accent);
  border-radius: var(--radius); padding: 30px 34px; margin: 40px 0;
}
.quiz h2 { margin: 0 0 6px; font-size: 20px; }
.quiz-sub { font-size: 14.5px; color: var(--ink-faint); margin-bottom: 24px; }
.quiz-q { margin-bottom: 26px; }
.quiz-q-title { font-weight: 700; color: var(--ink); margin-bottom: 12px; }
.quiz-option {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 11px 16px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); margin-bottom: 8px;
  cursor: pointer; transition: border-color .15s, background .15s;
  font-size: 15px; color: var(--ink-soft);
}
.quiz-option:hover { border-color: var(--accent); }
.quiz-option input { margin-top: 4px; accent-color: var(--accent); }
.quiz-option.correct { border-color: var(--mint); background: var(--mint-soft); color: var(--ink); }
.quiz-option.wrong { border-color: var(--coral); background: var(--coral-soft); }
.quiz-feedback { font-size: 14px; margin-top: 8px; display: none; }
.quiz-feedback.show { display: block; }
.quiz-feedback.ok { color: var(--mint); }
.quiz-feedback.fail { color: var(--coral); }
.btn {
  display: inline-block; border: none; cursor: pointer;
  font-family: var(--font-display); font-weight: 600; font-size: 14px;
  padding: 14px 28px; border-radius: 99px;
  background: var(--accent); color: #fff;
  text-decoration: none; text-align: center;
  transition: transform .15s, background .15s;
}
.btn:hover { background: var(--accent-deep); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent-deep); background: transparent; }
.quiz-result { margin-top: 16px; font-weight: 700; display: none; }
.quiz-result.show { display: block; }

/* ========== Навигация низа урока ========== */
.lesson-nav {
  display: flex; justify-content: space-between; gap: 14px;
  padding: 8px 0 80px;
}
.lesson-nav a {
  flex: 1; max-width: 360px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 22px;
  text-decoration: none; color: var(--ink);
  transition: border-color .15s, transform .15s;
}
.lesson-nav a:hover { border-color: var(--accent); transform: translateY(-2px); }
.lesson-nav .dir { font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .1em; }
.lesson-nav .title { font-family: var(--font-display); font-size: 14px; font-weight: 600; margin-top: 6px; }
.lesson-nav a.next { text-align: right; margin-left: auto; }

/* ========== Футер ========== */
.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  font-size: 13.5px; color: var(--ink-faint);
}

@media (max-width: 640px) {
  .module-card { grid-template-columns: 48px 1fr; }
  .module-status { display: none; }
  .module-num { font-size: 26px; }
  .topbar-progress .progress-label { display: none; }
  .hero { padding: 48px 0 32px; }
  .lesson-nav { flex-direction: column; }
  .lesson-nav a, .lesson-nav a.next { max-width: none; text-align: left; }
}