:root {
  color-scheme: light;
  --blue-900: #08215a;
  --blue-800: #0b3aa8;
  --blue-700: #1359d8;
  --blue-500: #3182f6;
  --cyan-500: #20c9d2;
  --orange-600: #f26a00;
  --orange-500: #ff8a00;
  --green-500: #1fbf75;
  --purple-500: #7357ff;
  --ink: #132142;
  --muted: #5d6b86;
  --line: #dbe7f8;
  --surface: #ffffff;
  --soft: #f3f8ff;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f7fbff;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(219, 231, 248, 0.88);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--blue-900);
  font-size: 18px;
  font-weight: 800;
  white-space: nowrap;
}

.brand-logo {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  object-fit: contain;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 20px;
  color: #27365a;
  font-size: 15px;
}

.site-nav a {
  padding: 8px 0;
}

.site-nav a:hover,
.footer-links a:hover {
  color: var(--orange-600);
}

.hero {
  position: relative;
  min-height: 82vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-bg,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-bg {
  background-image: url("./assets/poster.png");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center top;
  transform: scale(1.02);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(244, 250, 255, 0.98) 0%, rgba(244, 250, 255, 0.86) 39%, rgba(244, 250, 255, 0.28) 68%, rgba(244, 250, 255, 0.12) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(236, 246, 255, 0.7));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(720px, calc(100% - 36px));
  margin-left: clamp(18px, 8vw, 96px);
  padding: 76px 0 46px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--orange-600);
  font-size: 15px;
  font-weight: 800;
}

.hero h1,
.section h2 {
  margin: 0;
  color: var(--blue-900);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 8em;
  font-size: clamp(44px, 7vw, 92px);
  font-weight: 900;
}

.hero-copy {
  max-width: 620px;
  margin: 24px 0 0;
  color: #26395f;
  font-size: clamp(18px, 2.2vw, 25px);
  line-height: 1.7;
  font-weight: 600;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 22px;
  font-size: 16px;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(19, 89, 216, 0.14);
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
}

.button.secondary {
  color: var(--blue-800);
  border-color: rgba(49, 130, 246, 0.36);
  background: rgba(255, 255, 255, 0.84);
}

.button.outline {
  color: var(--blue-800);
  border-color: var(--line);
  background: var(--surface);
  box-shadow: none;
}

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

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  max-width: 640px;
  margin: 34px 0 0;
}

.hero-meta div {
  min-width: 0;
  padding: 14px;
  border: 1px solid rgba(219, 231, 248, 0.88);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

.hero-meta dt,
.download-panel dt {
  color: var(--muted);
  font-size: 13px;
}

.hero-meta dd,
.download-panel dd {
  margin: 6px 0 0;
  color: var(--blue-900);
  font-weight: 800;
}

.section {
  padding: 74px clamp(18px, 5vw, 72px);
}

.section-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.section h2 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
}

.two-col,
.download-layout,
.audience-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.intro-section {
  background: #ffffff;
}

.intro-copy {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

.intro-copy p {
  margin: 0 0 18px;
}

.feature-section {
  background:
    linear-gradient(135deg, rgba(49, 130, 246, 0.11), rgba(32, 201, 210, 0.12)),
    #f8fbff;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.feature-card {
  min-height: 236px;
  padding: 22px;
  border: 1px solid rgba(219, 231, 248, 0.95);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 42px rgba(9, 44, 103, 0.08);
}

.feature-index {
  display: inline-flex;
  min-width: 42px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: #fff;
  background: var(--blue-700);
  font-weight: 800;
}

.feature-card:nth-child(2) .feature-index {
  background: var(--green-500);
}

.feature-card:nth-child(3) .feature-index {
  background: var(--orange-500);
}

.feature-card:nth-child(4) .feature-index {
  background: var(--purple-500);
}

.feature-card:nth-child(5) .feature-index {
  background: var(--cyan-500);
}

.feature-card h3,
.audience-list h3 {
  margin: 18px 0 10px;
  color: var(--blue-900);
  font-size: 21px;
}

.feature-card p,
.audience-list p,
.download-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.audience-section {
  background: #fff;
}

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

.audience-list article {
  padding: 22px 24px;
  border-left: 5px solid var(--blue-500);
  border-radius: 8px;
  background: var(--soft);
}

.audience-list article:nth-child(2) {
  border-left-color: var(--orange-500);
}

.audience-list article:nth-child(3) {
  border-left-color: var(--green-500);
}

.download-section {
  background: linear-gradient(135deg, #eef7ff, #ffffff 46%, #fff4e7);
}

.download-copy p {
  margin-top: 18px;
  font-size: 18px;
}

.download-panel {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 18px 42px rgba(9, 44, 103, 0.08);
}

.app-logo {
  display: block;
  width: 74px;
  height: 74px;
  margin: 0 0 12px;
  object-fit: contain;
}

.download-panel dl {
  display: grid;
  gap: 0;
  margin: 0;
}

.download-panel dl div {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid #edf3fb;
}

.download-panel dl div:last-child {
  border-bottom: 0;
}

.download-panel dd {
  overflow-wrap: anywhere;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px clamp(18px, 5vw, 72px);
  color: #dfe9ff;
  background: var(--blue-900);
}

.site-footer p {
  margin: 6px 0 0;
  color: #b8c9f2;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-icp {
  margin-left: auto;
  color: #b8c9f2;
  font-size: 14px;
  text-align: right;
}

.footer-icp p {
  margin: 0;
  color: #b8c9f2;
  font-size: 14px;
}

@media (max-width: 620px) {
  .footer-icp {
    margin-left: 0;
    text-align: left;
    width: 100%;
  }
}

.policy-page {
  min-height: 100vh;
  background: #f8fbff;
}

.policy-main {
  width: min(920px, calc(100% - 36px));
  margin: 0 auto;
  padding: 54px 0 76px;
}

.policy-main h1 {
  margin: 0 0 12px;
  color: var(--blue-900);
  font-size: clamp(32px, 5vw, 52px);
}

.policy-main .updated {
  margin: 0 0 30px;
  color: var(--muted);
}

.policy-block {
  margin-top: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.policy-block h2 {
  margin: 0 0 12px;
  color: var(--blue-900);
  font-size: 22px;
}

.policy-block p,
.policy-block li {
  color: var(--muted);
  line-height: 1.85;
}

.policy-block a {
  color: var(--blue-700);
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.policy-block ul {
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    min-height: 760px;
    align-items: end;
  }

  .hero-bg {
    background-position: center top;
  }

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(244, 250, 255, 0.34) 0%, rgba(244, 250, 255, 0.94) 58%, rgba(244, 250, 255, 1) 100%);
  }

  .hero-content {
    width: calc(100% - 36px);
    margin: 0 auto;
    padding: 260px 0 42px;
  }

  .hero h1 {
    font-size: clamp(42px, 12vw, 66px);
  }

  .hero-meta,
  .feature-grid,
  .two-col,
  .download-layout,
  .audience-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 620px) {
  .site-nav {
    width: 100%;
    justify-content: flex-start;
    font-size: 14px;
  }

  .hero {
    min-height: 720px;
  }

  .hero-content {
    padding-top: 220px;
  }

  .hero-actions,
  .download-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .hero-meta,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 56px 18px;
  }

  .feature-card {
    min-height: auto;
  }

  .download-panel dl div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

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