:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #ffffff;
  --text: #152033;
  --muted: #5d6b82;
  --border: rgba(21, 32, 51, 0.1);
  --accent: #0f766e;
  --accent-strong: #115e59;
  --shadow: 0 20px 60px rgba(18, 38, 63, 0.12);
  --hero-gradient: linear-gradient(135deg, #dff6f3 0%, #eff4ff 55%, #fef3c7 100%);
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1522;
  --surface: rgba(12, 22, 36, 0.82);
  --surface-strong: #111d2f;
  --text: #e7edf8;
  --muted: #9fb0cb;
  --border: rgba(231, 237, 248, 0.1);
  --accent: #5eead4;
  --accent-strong: #99f6e4;
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.35);
  --hero-gradient: linear-gradient(135deg, #10263d 0%, #102b2d 50%, #31200f 100%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top, rgba(15, 118, 110, 0.1), transparent 32%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
}

.hero,
.quick-nav,
.page,
.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 32px 0 18px;
}

.hero__inner {
  padding: 56px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--hero-gradient);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 4vw, 4.4rem);
  line-height: 1.05;
}

.hero__lead {
  max-width: 760px;
  margin: 20px 0 0;
  font-size: 1.08rem;
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.button:hover,
.theme-toggle:hover {
  transform: translateY(-1px);
}

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

.button--secondary,
.theme-toggle {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
  backdrop-filter: blur(12px);
}

.quick-nav {
  margin-top: 18px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(16px);
}

.section {
  margin-top: 28px;
  padding: 30px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.section__header {
  margin-bottom: 20px;
}

.section__header h2 {
  margin: 0;
  font-size: 1.7rem;
}

.section__header p {
  margin: 8px 0 0;
  color: var(--muted);
}

.quick-nav__grid,
.highlight-grid,
.card-grid {
  display: grid;
  gap: 16px;
}

.quick-nav__grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.quick-nav__grid a {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface-strong);
  color: var(--text);
  font-weight: 600;
}

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

.highlight-card,
.card,
.guide-item {
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface-strong);
}

.highlight-card {
  padding: 22px;
}

.highlight-card h3,
.card h3,
.guide-item h3 {
  margin: 0 0 10px;
}

.highlight-card p,
.card p,
.guide-item p {
  margin: 0;
  color: var(--muted);
}

.card-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
}

.card__meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.card a {
  margin-top: auto;
  font-weight: 700;
}

.guide-list {
  display: grid;
  gap: 14px;
}

.guide-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
}

.guide-item a {
  flex: 0 0 auto;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.1);
  font-weight: 700;
}

.footer {
  padding: 28px 0 44px;
  color: var(--muted);
  text-align: center;
}

.footer p {
  margin: 6px 0;
}

@media (max-width: 720px) {
  .hero {
    padding-top: 18px;
  }

  .hero__inner,
  .quick-nav,
  .section {
    padding: 22px;
    border-radius: 20px;
  }

  .guide-item {
    flex-direction: column;
    align-items: flex-start;
  }
}