:root {
  --bg: #fffaf3;
  --bg-soft: #fff1de;
  --card: #ffffff;
  --line: #efd8bd;
  --text: #243126;
  --muted: #697466;
  --primary: #f97316;
  --primary-dark: #c2410c;
  --primary-soft: #ffedd5;
  --secondary: #0f766e;
  --secondary-soft: #d7f3ec;
  --cream: #fff7ed;
  --shadow: 0 18px 45px rgba(194, 65, 12, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Segoe UI", Arial, sans-serif;
  background: linear-gradient(180deg, #fff7ed 0%, #fffaf3 36%, #f7fbf7 100%);
  color: var(--text);
  line-height: 1.65;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(100% - 2rem, 1120px);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--text);
  color: #fff;
  padding: 0.45rem 0.7rem;
  border-radius: var(--radius);
  z-index: 20;
}

.hero {
  position: relative;
  padding: 1rem 0 2.6rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(255, 247, 237, 0.95), rgba(255, 255, 255, 0.72)),
    url("assets/og-home.svg");
  background-size: cover;
  background-position: center;
  opacity: 0.95;
  z-index: -1;
}

.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
}

.brand img {
  border-radius: 9px;
  box-shadow: 0 8px 18px rgba(194, 65, 12, 0.12);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.nav-links a {
  color: #4d5a4f;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.24rem 0.68rem;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--primary-dark);
  background: var(--primary-soft);
  border-color: #fed7aa;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  gap: 2rem;
  align-items: center;
  margin-top: 1rem;
}

.hero-tag,
.section-kicker {
  display: inline-block;
  margin: 0 0 0.55rem;
  color: var(--primary-dark);
  font-size: 0.9rem;
  font-weight: 800;
}

.hero-tag {
  background: rgba(255, 237, 213, 0.85);
  border: 1px solid #fed7aa;
  border-radius: 999px;
  padding: 0.25rem 0.68rem;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0.9rem 0 0.7rem;
  font-size: clamp(2rem, 4vw, 3.65rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2.2vw, 2.35rem);
  line-height: 1.2;
}

h3 {
  margin: 0;
  font-size: 1.08rem;
}

.hero-sub {
  margin: 0;
  color: var(--muted);
  max-width: 58ch;
}

.hero-actions {
  margin-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  text-decoration: none;
  border-radius: var(--radius);
  padding: 0.58rem 0.95rem;
  font-weight: 800;
}

.btn-primary {
  color: #fff;
  background: var(--primary);
  border: 1px solid var(--primary);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-ghost {
  color: var(--secondary);
  border: 1px solid rgba(15, 118, 110, 0.28);
  background: rgba(215, 243, 236, 0.7);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--secondary-soft);
}

.hero-visual img {
  width: 100%;
  height: auto;
  border: 1px solid rgba(239, 216, 189, 0.9);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

main {
  padding: 1.2rem 0 2rem;
}

.card,
.scene-card,
.flow-section {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  padding: 1.15rem;
  margin-bottom: 1rem;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 0.95rem;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
}

.pill {
  border-radius: 999px;
  padding: 0.28rem 0.72rem;
  border: 1px solid #fed7aa;
  color: var(--primary-dark);
  background: var(--primary-soft);
  font-size: 0.9rem;
  font-weight: 700;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.stat-item,
.download-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem;
  background: #fffdf9;
}

.stat-item b {
  display: block;
  color: var(--secondary);
  font-size: 1.16rem;
}

.stat-item span,
.download-item p,
.scene-card p,
.flow-copy p,
.flow-steps p,
.card > p {
  color: var(--muted);
}

.visual-section {
  margin: 1rem 0;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.scene-card {
  overflow: hidden;
}

.scene-card img {
  display: block;
  width: 100%;
  aspect-ratio: 13 / 8;
  object-fit: cover;
  background: var(--cream);
  border-bottom: 1px solid var(--line);
}

.scene-card h3,
.scene-card p {
  margin-inline: 0.95rem;
}

.scene-card h3 {
  margin-top: 0.9rem;
  color: var(--secondary);
}

.scene-card p {
  margin-top: 0.35rem;
  margin-bottom: 1rem;
}

.flow-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 1.2rem;
  align-items: start;
  padding: 1.15rem;
  margin-bottom: 1rem;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(255, 247, 237, 0.92)),
    url("assets/support-scene.svg");
  background-size: cover;
  background-position: center;
}

.flow-copy p {
  margin: 0.8rem 0 0;
}

.flow-steps {
  display: grid;
  gap: 0.75rem;
}

.flow-steps article {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 0.2rem 0.75rem;
  padding: 0.85rem;
  border: 1px solid rgba(239, 216, 189, 0.9);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.9);
}

.flow-steps span {
  grid-row: span 2;
  display: inline-grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  color: #fff;
  background: var(--secondary);
  font-weight: 800;
}

.flow-steps strong {
  line-height: 1.2;
}

.flow-steps p {
  margin: 0;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.download-item h3 {
  margin: 0 0 0.3rem;
}

.download-item a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin-top: 0.55rem;
  padding: 0.48rem 0.78rem;
  color: #fff;
  background: var(--secondary);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 800;
}

.download-item a:hover,
.download-item a:focus-visible {
  background: #0b4f4a;
}

.footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 247, 237, 0.92);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem 0;
}

.footer-inner p {
  margin: 0;
  color: var(--muted);
}

.footer-inner a {
  color: var(--primary-dark);
  text-decoration: none;
  font-weight: 800;
}

@media (max-width: 900px) {
  .hero-grid,
  .stats,
  .download-cards,
  .flow-section {
    grid-template-columns: 1fr;
  }

  .scene-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-bottom: 1.5rem;
  }

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

@media (max-width: 560px) {
  .top-nav {
    align-items: flex-start;
  }

  .nav-links {
    justify-content: flex-end;
  }

  .hero-actions .btn {
    width: 100%;
  }
}