@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Literata:opsz,wght@7..72,300;7..72,500;7..72,700&display=swap');

:root {
  --color-ink: #1e1b18;
  --color-ink-soft: #4a403a;
  --color-bg: #f7efe4;
  --color-surface: #fffaf3;
  --color-primary: #c62a2a;
  --color-primary-dark: #8b1d1d;
  --color-accent: #f2b65b;
  --color-teal: #2f6f6b;
  --shadow-soft: 0 20px 40px rgba(0, 0, 0, 0.08);
  --shadow-tight: 0 10px 20px rgba(0, 0, 0, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --font-display: "Bebas Neue", "Oswald", sans-serif;
  --font-body: "Literata", "Georgia", serif;
  --max-width: 1200px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background:
    radial-gradient(circle at top left, rgba(198, 42, 42, 0.1), transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(242, 182, 91, 0.2), transparent 55%),
    linear-gradient(180deg, #f8f1e9 0%, #f5ebe0 40%, #f1e6db 100%);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

p {
  line-height: 1.6;
}

main {
  display: block;
}

.section,
.hero {
  padding: 100px 24px;
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--color-primary);
  margin: 0 0 10px;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  margin: 0 0 16px;
}

.section-summary {
  color: var(--color-ink-soft);
  margin: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(247, 239, 228, 0.9);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0;
}

.brand-sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-ink-soft);
}

.nav-toggle {
  display: none;
  border: 1px solid rgba(0, 0, 0, 0.2);
  background: var(--color-surface);
  padding: 8px 14px;
  border-radius: 999px;
  font-family: var(--font-display);
  letter-spacing: 0.06em;
}

.site-nav {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 0.9rem;
  overflow-x: auto;
  padding: 4px 0;
}

.site-nav a {
  padding: 6px 10px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.site-nav a.active,
.site-nav a:hover {
  background: var(--color-primary);
  color: #fff;
}

.hero {
  position: relative;
  padding-top: calc(var(--header-height) + 80px);
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(24, 22, 20, 0.88), rgba(24, 22, 20, 0.5)),
    url("assets/pptx/image7.jpg") center/cover no-repeat;
  z-index: -2;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(198, 42, 42, 0.55), transparent 55%);
  z-index: -1;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 24px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  margin: 0;
}

.hero-eyebrow {
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
}

.hero-lead {
  max-width: 620px;
  font-size: 1.1rem;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease;
}

.button.primary {
  background: var(--color-primary);
  color: #fff;
}

.button.ghost {
  border-color: rgba(255, 255, 255, 0.6);
  color: #fff;
}

.button:hover {
  transform: translateY(-2px);
}

.hero-meta {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.7);
  margin: 0 0 6px;
}

.meta-value {
  margin: 0;
  font-size: 1rem;
}

.lesson-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.lesson-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow-tight);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.lesson-card img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.lesson-tag {
  font-size: 0.8rem;
  margin: 0;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.lesson-card h3 {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.lesson {
  position: relative;
}

.lesson-grid {
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
}

.lesson-content {
  display: grid;
  gap: 20px;
}

.lesson-aside {
  display: grid;
  gap: 20px;
  align-self: start;
}

.lesson-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-tight);
}

.card h3 {
  margin-top: 0;
  font-family: var(--font-display);
  font-size: 1.8rem;
}

.split {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.list {
  padding-left: 18px;
  margin: 0;
  line-height: 1.6;
}

.table {
  display: grid;
  gap: 10px;
}

.table-row {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed rgba(0, 0, 0, 0.15);
  padding-bottom: 6px;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-group span {
  background: rgba(198, 42, 42, 0.12);
  color: var(--color-primary-dark);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
}

.steps {
  padding-left: 18px;
  margin: 0;
  line-height: 1.6;
}

.aside-box {
  background: rgba(47, 111, 107, 0.12);
  border-radius: var(--radius-md);
  padding: 20px;
}

.video-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.video-card .video {
  position: relative;
  padding-top: 56.25%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-tight);
}

.video-card iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.practice-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.note {
  margin-top: 24px;
  padding: 16px 20px;
  border-left: 4px solid var(--color-primary);
  background: rgba(198, 42, 42, 0.08);
  border-radius: var(--radius-sm);
}

.site-footer {
  text-align: center;
  padding: 32px 16px 48px;
  color: var(--color-ink-soft);
}

section[data-section] {
  scroll-margin-top: 100px;
}

@media (max-width: 980px) {
  .lesson-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    font-size: 0.85rem;
  }
}

@media (max-width: 760px) {
  .site-header {
    flex-wrap: wrap;
    gap: 12px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-wrap: wrap;
    padding: 12px 0 6px;
  }

  body.nav-open .site-nav {
    display: flex;
  }

  .hero {
    padding-top: calc(var(--header-height) + 60px);
  }

  .section,
  .hero {
    padding: 80px 20px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button,
  .lesson-card {
    transition: none;
  }
}