:root {
  --brand: #ffd400;
  --brand-dark: #d6ae00;
  --ink: #111111;
  --text: #202124;
  --muted: #5f6368;
  --line: #e8eaed;
  --soft: #fff8cb;
  --soft-2: #f7f8fa;
  --white: #ffffff;
  --shadow: 0 18px 46px rgba(17, 17, 17, 0.12);
  --radius: 8px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--white);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

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

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

p {
  margin: 0;
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0;
}

.brand img {
  width: 158px;
  height: 80px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 15px;
  color: #343434;
}

.nav-links a {
  position: relative;
  padding: 8px 0;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
  color: var(--ink);
}

.nav-links a[aria-current="page"]::after,
.nav-links a:hover::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  border-radius: 2px;
  background: var(--brand);
}

.mobile-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
}

.mobile-toggle span,
.mobile-toggle::before,
.mobile-toggle::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  border-radius: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: var(--ink);
  background: var(--brand);
  box-shadow: 0 12px 24px rgba(255, 212, 0, 0.28);
}

.btn-primary:hover {
  background: #ffdf2e;
}

.btn-dark {
  color: var(--white);
  background: var(--ink);
}

.btn-ghost {
  color: var(--ink);
  background: var(--white);
  border-color: #d9dce1;
}

.hero {
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(255, 212, 0, 0.18), transparent 36%),
    linear-gradient(180deg, #fff 0%, #fbfbfd 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(360px, 1.06fr);
  gap: 52px;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 60px 0 50px;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead,
.page-hero p {
  margin-top: 22px;
  color: #3f3f46;
  font-size: 19px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 34px;
}

.proof-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
}

.proof-item strong {
  display: block;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.2;
}

.proof-item span {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: 13px;
}

.hero-media {
  position: relative;
}

.hero-media img {
  display: block;
  width: 100%;
  filter: drop-shadow(0 24px 34px rgba(17, 17, 17, 0.16));
}

.section {
  padding: 92px 0;
}

.section-alt {
  background: var(--soft-2);
}

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

.section-head {
  width: min(760px, 100%);
  margin-bottom: 40px;
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.section-head h2,
.content h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-head p,
.content p {
  margin-top: 14px;
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card,
.scene-card,
.quote-card,
.faq-card,
.download-card,
.step-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.feature-card {
  min-height: 216px;
  padding: 26px;
}

.icon-box {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--brand);
}

.icon-box svg {
  width: 25px;
  height: 25px;
}

.feature-card h3,
.scene-card h3,
.quote-card h3,
.faq-card h3,
.download-card h3,
.step-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.35;
}

.feature-card p,
.scene-card p,
.quote-card p,
.faq-card p,
.download-card p,
.step-card p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.92fr);
  gap: 56px;
  align-items: center;
}

.media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}

.list-check {
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.list-check li {
  position: relative;
  padding-left: 34px;
  color: #3f3f46;
}

.list-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--brand);
}

.list-check li::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  width: 7px;
  height: 4px;
  border-left: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(-45deg);
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.scene-card {
  padding: 24px;
  min-height: 210px;
}

.scene-card strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--brand);
  font-size: 15px;
}

.quote-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.quote-card {
  padding: 26px;
}

.avatar {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  border-radius: 50%;
  background: var(--brand);
  color: var(--ink);
  font-weight: 800;
}

.quote-card blockquote {
  margin: 0;
  color: #333;
  font-size: 16px;
}

.quote-card h3 {
  margin-top: 18px;
  font-size: 16px;
}

.quote-card p {
  margin-top: 2px;
  font-size: 13px;
}

.download-band {
  padding: 54px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  border-radius: var(--radius);
  color: var(--white);
  background: var(--ink);
}

.download-band h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
}

.download-band p {
  margin-top: 12px;
  color: #d1d5db;
}

.page-hero {
  padding: 76px 0 54px;
  background: linear-gradient(135deg, var(--soft), #fff 58%);
}

.breadcrumb {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--ink);
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.86fr);
  gap: 28px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.download-card {
  padding: 28px;
}

.download-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 22px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 10px;
  border-radius: var(--radius);
  color: #3f3f46;
  background: #f1f3f4;
  font-size: 13px;
}

.tag.hot {
  color: var(--ink);
  background: var(--brand);
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-card {
  padding: 24px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  counter-reset: step;
}

.step-card {
  padding: 26px;
  counter-increment: step;
}

.step-card::before {
  content: "0" counter(step);
  display: block;
  margin-bottom: 18px;
  color: var(--brand-dark);
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
}

.source-box {
  padding: 28px;
  border-left: 6px solid var(--brand);
  background: #fff;
  border-radius: var(--radius);
}

.source-box h2,
.source-box h3 {
  margin: 0;
  color: var(--ink);
}

.source-box ul {
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.site-footer {
  padding: 44px 0;
  color: #c7c7c7;
  background: #111;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) repeat(3, minmax(130px, 0.4fr));
  gap: 28px;
}

.site-footer strong {
  display: block;
  color: #fff;
  margin-bottom: 12px;
}

.site-footer a,
.site-footer span {
  display: block;
  margin-top: 8px;
  color: #c7c7c7;
  font-size: 14px;
}

.site-footer p {
  margin: 12px 0 0;
  max-width: 520px;
  font-size: 14px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal.is-open {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 17, 17, 0.62);
}

.modal-panel {
  position: relative;
  width: min(760px, 100%);
  max-height: calc(100vh - 48px);
  overflow: auto;
  padding: 34px;
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.modal-title {
  margin: 0;
  padding-right: 54px;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.2;
}

.modal-desc {
  margin-top: 12px;
  color: var(--muted);
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.qr-card {
  padding: 22px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.qr-card img {
  width: 176px;
  height: 176px;
  object-fit: contain;
}

.qr-card h3 {
  margin: 14px 0 6px;
  color: var(--ink);
  font-size: 18px;
}

.qr-card p {
  color: var(--muted);
  font-size: 14px;
}

.modal-note {
  margin-top: 22px;
  padding: 14px 16px;
  border-radius: var(--radius);
  color: #3f3f46;
  background: var(--soft);
  font-size: 14px;
}

body.modal-locked {
  overflow: hidden;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 14px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 16px;
}

@media (max-width: 920px) {
  .mobile-toggle {
    display: block;
  }

  .nav {
    flex-wrap: wrap;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 0 0 16px;
  }

  .nav-links.is-open {
    display: flex;
  }

  .hero-grid,
  .split,
  .two-col {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    min-height: auto;
  }

  .hero-proof,
  .feature-grid,
  .scene-grid,
  .quote-grid,
  .steps,
  .download-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .download-band {
    grid-template-columns: 1fr;
    padding: 36px 26px;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .brand img {
    width: 118px;
  }

  .section {
    padding: 66px 0;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 38px;
  }

  .hero-lead,
  .page-hero p {
    font-size: 16px;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    align-items: stretch;
  }

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

  .modal-panel {
    padding: 28px 18px;
  }
}