:root {
  --color-primary: #df1007;
  --color-primary-deep: #b60c05;
  --color-primary-soft: #ffe6e3;
  --color-text: #172033;
  --color-text-muted: #55607a;
  --color-surface: #ffffff;
  --color-surface-alt: #fff8f7;
  --color-border: #f1d2cd;
  --color-hero: #1f1520;
  --color-hero-glow: rgba(223, 16, 7, 0.2);
  --color-shadow: rgba(18, 28, 45, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --container-width: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: #fffdfc;
  line-height: 1.7;
}

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

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

.container {
  width: min(calc(100% - 32px), var(--container-width));
  margin: 0 auto;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 72px;
  background:
    radial-gradient(circle at top right, var(--color-hero-glow), transparent 28%),
    linear-gradient(135deg, #1e1723 0%, #26171a 45%, #130f14 100%);
  color: #fff;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -120px auto;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(223, 16, 7, 0.42), rgba(223, 16, 7, 0));
  pointer-events: none;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 8px 0 32px;
}

.brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: #fff;
}

.hero-grid {
  display: grid;
  gap: 28px;
}

.eyebrow,
.section-tag {
  margin: 0 0 12px;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.hero .eyebrow {
  color: #ffb7b2;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(2.3rem, 7vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  max-width: 11ch;
}

.hero-text {
  margin: 20px 0 0;
  max-width: 620px;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.82);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 14px 34px rgba(223, 16, 7, 0.28);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--color-primary-deep);
}

.button-secondary {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgba(255, 255, 255, 0.44);
  background: rgba(255, 255, 255, 0.08);
}

.hero-panel {
  display: grid;
  gap: 16px;
}

.stat-card,
.info-card,
.feature-block,
.callout {
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: 0 20px 50px var(--color-shadow);
}

.stat-card {
  padding: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.06));
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  box-shadow: none;
  backdrop-filter: blur(12px);
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
}

.stat-label {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.96rem;
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-surface-alt);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.75rem, 5vw, 2.7rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.section-heading p:last-child {
  margin: 16px 0 0;
  color: var(--color-text-muted);
}

.timeline,
.grid {
  display: grid;
  gap: 18px;
}

.info-card,
.feature-block {
  padding: 26px;
  border: 1px solid rgba(223, 16, 7, 0.08);
}

.info-card h3,
.feature-block h3 {
  margin: 0 0 12px;
  font-size: 1.18rem;
}

.info-card p,
.feature-block p {
  margin: 0;
  color: var(--color-text-muted);
}

.feature-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding-left: 22px;
  color: var(--color-text-muted);
}

.feature-list li + li {
  margin-top: 10px;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  transform: translateY(-50%);
}

.section-highlight {
  padding-top: 16px;
  padding-bottom: 88px;
}

.callout {
  display: grid;
  gap: 18px;
  padding: 30px;
  background: linear-gradient(135deg, rgba(223, 16, 7, 0.08), rgba(255, 248, 247, 0.95));
  border: 1px solid var(--color-border);
}

.callout h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  line-height: 1.2;
}

.callout-text {
  margin: 0;
  color: var(--color-text-muted);
}

.footer {
  padding: 24px 0 36px;
  border-top: 1px solid rgba(223, 16, 7, 0.08);
  background: #fff;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  color: var(--color-primary);
  font-weight: 700;
}

@media (min-width: 840px) {
  .hero {
    padding-bottom: 96px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(300px, 0.8fr);
    align-items: end;
  }

  .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .callout {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (max-width: 839px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-copy h1 {
    max-width: 100%;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 540px) {
  .hero {
    padding-top: 16px;
    padding-bottom: 56px;
  }

  .container {
    width: min(calc(100% - 24px), var(--container-width));
  }

  .section {
    padding: 56px 0;
  }

  .hero-text,
  .section-heading p:last-child,
  .info-card p,
  .feature-block p,
  .feature-list li,
  .callout-text,
  .footer-inner {
    font-size: 0.97rem;
  }

  .stat-card,
  .info-card,
  .feature-block,
  .callout {
    padding: 22px;
    border-radius: var(--radius-sm);
  }

  .button {
    width: 100%;
  }
}