:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5f6b7a;
  --line: #d8e1ec;
  --soft: #f4f7fb;
  --blue: #075fb8;
  --blue-dark: #034981;
  --gold: #b58234;
  --black: #10151d;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 36px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand img {
  width: 188px;
  display: block;
}

.nav {
  display: flex;
  gap: 22px;
  font-weight: 800;
  color: #273449;
}

.nav a {
  text-decoration: none;
}

.hero {
  min-height: calc(100vh - 74px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  align-items: center;
  gap: 46px;
  padding: 72px 7vw;
  background:
    linear-gradient(105deg, #f6f9fc 0%, #f6f9fc 52%, rgba(16, 21, 29, 0.94) 52%, rgba(16, 21, 29, 0.98) 100%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(42px, 6vw, 78px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(28px, 3vw, 42px);
  letter-spacing: 0;
}

h3 {
  font-size: 20px;
  letter-spacing: 0;
}

.lead {
  max-width: 700px;
  margin-top: 24px;
  color: #344155;
  font-size: 21px;
  line-height: 1.75;
}

.hero-actions,
.model-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-actions {
  margin-top: 34px;
}

.primary,
.secondary,
.video-link,
.model-actions button {
  min-height: 46px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  font-weight: 900;
  text-decoration: none;
}

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

.primary:hover {
  background: var(--blue-dark);
}

.secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: #182235;
}

.hero-panel {
  display: grid;
  gap: 14px;
}

.hero-panel div {
  border: 1px solid rgba(181, 130, 52, 0.48);
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  border-radius: 8px;
  padding: 24px;
}

.hero-panel span {
  display: block;
  color: #c9d2de;
  margin-bottom: 8px;
}

.hero-panel strong {
  font-size: 24px;
}

.section {
  padding: 76px 7vw;
}

.section-title {
  max-width: 860px;
  margin-bottom: 30px;
}

.section-title p:not(.eyebrow) {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 18px;
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.category-tabs button {
  border: 1px solid var(--line);
  background: #fff;
  color: #253247;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 800;
  cursor: pointer;
}

.category-tabs button.active {
  border-color: var(--blue);
  background: #eaf3ff;
  color: var(--blue);
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.model-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.media {
  aspect-ratio: 4 / 3;
  background: #111827;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.model-content {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.tag {
  width: fit-content;
  border: 1px solid #e8d2ad;
  color: #754f18;
  background: #fff8ed;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 900;
}

.model-content p,
.rule-grid p,
.materials-list li,
.cta-copy p,
.footer p,
.cta-actions p {
  color: var(--muted);
  line-height: 1.7;
}

.video-link {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--blue);
}

.video-link.pending {
  color: #6d7480;
}

.model-actions button {
  border: 0;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
}

.band {
  background: var(--soft);
}

.rule-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.rule-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 22px;
}

.rule-grid h3 {
  margin-bottom: 10px;
}

.materials-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.materials-list {
  border-top: 3px solid var(--blue);
  padding-top: 18px;
}

.materials-list ul {
  padding-left: 22px;
  margin: 16px 0 0;
}

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

.cta-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 34px;
  align-items: center;
  background: var(--black);
  color: #fff;
}

.cta-section .eyebrow {
  color: #85bfff;
}

.cta-copy p,
.cta-actions p {
  color: #c9d2de;
}

.selected-box {
  margin-top: 18px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  padding: 14px;
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.cta-actions {
  align-content: center;
}

.primary.disabled {
  background: #6b7280;
  pointer-events: none;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 7vw;
  border-top: 1px solid var(--line);
}

.contact {
  display: grid;
  gap: 6px;
  color: #334155;
}

@media (max-width: 1080px) {
  .hero,
  .model-grid,
  .rule-grid,
  .materials-layout,
  .cta-section {
    grid-template-columns: 1fr;
  }

  .hero {
    background: #f6f9fc;
  }

  .hero-panel div {
    background: #10151d;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: auto;
    display: grid;
    padding: 14px 16px;
  }

  .brand img {
    width: 156px;
  }

  .nav {
    overflow-x: auto;
    gap: 14px;
    font-size: 14px;
  }

  .section,
  .hero,
  .footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .footer {
    display: grid;
  }
}