:root {
  --ink: #142033;
  --ink-soft: #3d4a5c;
  --paper: #f6f0e6;
  --paper-2: #efe6d8;
  --cinnabar: #b23a2f;
  --cinnabar-deep: #8e2c24;
  --gold: #c4a574;
  --white: #fffdf8;
  --line: rgba(20, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(178, 58, 47, 0.08), transparent 32%),
    linear-gradient(180deg, #ece4d6 0%, #d8cbb8 100%);
  line-height: 1.7;
}

.paper {
  max-width: 1120px;
  margin: 32px auto;
  background: var(--paper);
  border: 1px solid rgba(20, 32, 51, 0.08);
  box-shadow: 0 24px 60px rgba(20, 32, 51, 0.12);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 40px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(246, 240, 230, 0.92);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: "Noto Serif TC", serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 6px rgba(178, 58, 47, 0.15);
}

nav {
  display: flex;
  gap: 22px;
}

nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 15px;
}

nav a:hover {
  color: var(--cinnabar);
}

.hero {
  padding: 72px 40px 28px;
  position: relative;
}

.eyebrow {
  color: var(--cinnabar);
  letter-spacing: 0.28em;
  font-size: 12px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

h1, h2, h3 {
  font-family: "Noto Serif TC", serif;
  line-height: 1.25;
}

h1 {
  font-size: clamp(40px, 7vw, 72px);
  margin-bottom: 22px;
}

.lead {
  max-width: 640px;
  font-size: 18px;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 700;
}

.btn.primary {
  background: var(--cinnabar);
  color: white;
}

.btn.primary:hover {
  background: var(--cinnabar-deep);
}

.btn.ghost {
  color: var(--ink);
  border: 1px solid var(--ink);
}

.pulse-line {
  display: block;
  width: calc(100% + 80px);
  margin: 48px -40px 0;
  height: 90px;
}

.pulse-line path {
  fill: none;
  stroke: var(--cinnabar);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.section {
  padding: 64px 40px;
}

.section.muted {
  background: var(--paper-2);
}

.section-head {
  margin-bottom: 28px;
}

h2 {
  font-size: 36px;
}

.split {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 28px;
  align-items: start;
}

.split p + p {
  margin-top: 16px;
}

.card.quote {
  background: var(--ink);
  color: var(--white);
  padding: 32px;
  min-height: 100%;
}

.card.quote p {
  font-family: "Noto Serif TC", serif;
  font-size: 26px;
  line-height: 1.45;
}

.card.quote span {
  display: block;
  margin-top: 20px;
  color: var(--gold);
  letter-spacing: 0.18em;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.features article {
  background: var(--white);
  padding: 24px;
  border-top: 3px solid var(--cinnabar);
}

.features h3 {
  font-size: 22px;
  margin-bottom: 10px;
}

.note {
  color: var(--ink-soft);
  margin-top: 8px;
}

.videos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.video-card {
  background: var(--white);
  padding: 18px 18px 22px;
}

.frame {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 16;
  background: #111;
  overflow: hidden;
}

.frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card h3 {
  margin-top: 16px;
  font-size: 24px;
}

.video-card p {
  color: var(--ink-soft);
}

.text-link {
  display: inline-block;
  margin-top: 8px;
  color: var(--cinnabar);
  text-decoration: none;
  font-weight: 700;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 40px 36px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14px;
}

.footer strong {
  display: block;
  color: var(--ink);
  font-family: "Noto Serif TC", serif;
  font-size: 18px;
  margin-bottom: 4px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.contact-card {
  display: block;
  background: var(--white);
  padding: 24px;
  text-decoration: none;
  color: var(--ink);
  border-top: 3px solid var(--gold);
}

.contact-card span {
  display: block;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

.contact-card strong {
  font-family: "Noto Serif TC", serif;
  font-size: 20px;
  font-weight: 700;
}

.contact-card:hover strong {
  color: var(--cinnabar);
}

.disclaimer {
  max-width: 420px;
}

@media (max-width: 800px) {
  .paper {
    margin: 0;
  }

  .nav, .hero, .section, .footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px;
  }

  .split,
  .features,
  .videos,
  .contact-grid,
  .footer {
    grid-template-columns: 1fr;
    display: grid;
  }

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

  .pulse-line {
    width: calc(100% + 40px);
    margin-left: -20px;
    margin-right: -20px;
  }
}