:root {
  color-scheme: light;
  --ink: #172024;
  --muted: #5b686d;
  --line: #d9e0dd;
  --paper: #f6f7f3;
  --white: #ffffff;
  --green: #1f6f5b;
  --green-dark: #164d41;
  --amber: #d28a2d;
  --red: #b8453d;
  --blue: #315d85;
  --shadow: 0 22px 70px rgba(21, 32, 36, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

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;
  min-height: 72px;
  padding: 14px clamp(18px, 5vw, 72px);
  background: rgba(246, 247, 243, 0.9);
  border-bottom: 1px solid rgba(23, 32, 36, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 18px;
  white-space: nowrap;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(23, 32, 36, 0.16);
}

.nav {
  display: flex;
  gap: clamp(14px, 3vw, 34px);
  color: var(--muted);
  font-size: 15px;
  font-weight: 650;
}

.nav a {
  padding: 8px 0;
}

.nav a:hover {
  color: var(--green-dark);
}

.hero {
  position: relative;
  min-height: calc(100svh - 72px);
  overflow: hidden;
  isolation: isolate;
}

.hero-bg,
.hero-shade {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(12, 20, 22, 0.84) 0%, rgba(12, 20, 22, 0.64) 46%, rgba(12, 20, 22, 0.24) 100%),
    linear-gradient(0deg, rgba(12, 20, 22, 0.52), rgba(12, 20, 22, 0.02) 42%);
}

.hero-content {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(280px, 0.72fr);
  align-items: center;
  gap: clamp(36px, 7vw, 96px);
  width: min(1180px, calc(100% - 36px));
  min-height: calc(100svh - 72px);
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero-copy {
  color: var(--white);
  max-width: 720px;
}

.app-mark {
  width: 76px;
  height: 76px;
  border-radius: 18px;
  margin-bottom: 28px;
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.28);
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--amber);
  font-size: 14px;
  font-weight: 850;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(54px, 9vw, 112px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-text {
  max-width: 670px;
  margin-bottom: 24px;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(18px, 2.1vw, 24px);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.hero-badges span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 13px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.1);
  font-size: 14px;
  font-weight: 750;
  backdrop-filter: blur(12px);
}

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

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-action {
  background: var(--amber);
  color: #15100a;
}

.primary-action:hover {
  background: #e49b3c;
}

.secondary-action {
  border: 1px solid rgba(255, 255, 255, 0.56);
  color: var(--white);
}

.secondary-action:hover {
  background: rgba(255, 255, 255, 0.12);
}

.phone-wrap {
  display: flex;
  justify-content: center;
  align-self: end;
}

.phone {
  width: min(330px, 74vw);
  aspect-ratio: 9 / 16;
  padding: 12px;
  border-radius: 42px;
  background: #101617;
  box-shadow: var(--shadow);
}

.phone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 32px;
}

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

.section-inner,
.features,
.support {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.intro .section-inner,
.privacy .section-inner {
  padding: clamp(58px, 8vw, 94px) 0;
}

.intro h2,
.privacy h2,
.support h2,
.section-heading h2 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(30px, 4.2vw, 54px);
  line-height: 1.12;
  letter-spacing: 0;
}

.intro p:last-child,
.support p,
.privacy-list {
  color: var(--muted);
  font-size: 18px;
}

.features {
  padding: clamp(58px, 8vw, 96px) 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  min-height: 230px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.feature-number {
  display: inline-block;
  margin-bottom: 32px;
  color: var(--red);
  font-weight: 900;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.feature-card p {
  color: var(--muted);
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 7vw, 92px);
}

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

.privacy-list p {
  margin: 0;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.privacy-list strong {
  color: var(--green-dark);
}

.support {
  padding: clamp(58px, 8vw, 96px) 0;
}

.support-panel {
  padding: clamp(30px, 5vw, 56px);
  border-radius: 8px;
  color: var(--white);
  background:
    linear-gradient(115deg, rgba(22, 77, 65, 0.94), rgba(49, 93, 133, 0.92)),
    url("assets/road-scene.jpg") center / cover;
}

.support-panel p {
  max-width: 790px;
  color: rgba(255, 255, 255, 0.84);
}

.primary-action.dark {
  margin-top: 10px;
  background: var(--white);
  color: var(--green-dark);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(18px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

@media (max-width: 860px) {
  .hero-content {
    grid-template-columns: 1fr;
    padding-top: 42px;
  }

  .phone-wrap {
    justify-content: flex-start;
  }

  .phone {
    width: min(300px, 70vw);
  }

  .feature-grid,
  .two-column {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    min-height: auto;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .site-footer {
    flex-direction: column;
  }
}