:root {
  color-scheme: light;
  --ink: #17181c;
  --text: #2c3038;
  --muted: #6d7380;
  --soft: #f7f8fa;
  --paper: #ffffff;
  --line: #e7e9ee;
  --coral: #ff756d;
  --blue: #4c7dff;
  --green: #2f9d78;
  --shadow: 0 22px 70px rgba(28, 32, 40, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(231, 233, 238, 0.72);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(20px);
}

.nav {
  width: min(1120px, calc(100% - 40px));
  min-height: 56px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  color: var(--ink);
}

.brand img {
  width: 30px;
  height: 30px;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

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

.nav-action {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
}

.hero {
  min-height: calc(100vh - 56px);
  padding: 72px 0 44px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    linear-gradient(145deg, rgba(255, 248, 244, 0.94) 0%, rgba(255, 255, 255, 1) 43%),
    linear-gradient(180deg, #ffffff 0%, #f3f7fb 100%);
}

.hero-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(320px, 1.04fr);
  align-items: center;
  gap: 52px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 15px;
}

.hero-kicker img {
  width: 42px;
  height: 42px;
}

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

h1 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(52px, 8vw, 88px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 560px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 1.48;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-weight: 620;
  box-shadow: 0 12px 28px rgba(28, 32, 40, 0.06);
}

.button.primary {
  border-color: #1f1f24;
  background: #1f1f24;
  color: #fff;
}

.product-stage {
  min-height: 640px;
  position: relative;
  display: grid;
  place-items: center;
}

.phone-stack {
  width: min(100%, 560px);
  position: relative;
  display: grid;
  grid-template-columns: 1fr 0.82fr;
  align-items: end;
  gap: 0;
}

.phone-shot {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
  background: #fff;
}

.phone-shot.secondary {
  width: 86%;
  margin-left: -18%;
  transform: translateY(28px);
  box-shadow: 0 18px 54px rgba(28, 32, 40, 0.1);
}

.section {
  padding: 76px 0;
}

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

.section-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

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

.section-heading.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--coral);
  font-size: 14px;
  font-weight: 720;
}

h2 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-lead {
  color: var(--muted);
  font-size: 19px;
}

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

.feature-card,
.support-card,
.policy-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 14px 42px rgba(28, 32, 40, 0.06);
}

.feature-card {
  min-height: 232px;
  padding: 24px;
}

.feature-mark {
  width: 34px;
  height: 34px;
  margin-bottom: 32px;
  border-radius: 8px;
  background: var(--mark-color, var(--coral));
}

.feature-card h3,
.support-card h3,
.policy-card h2 {
  color: var(--ink);
  font-size: 22px;
  line-height: 1.24;
}

.feature-card p,
.support-card p,
.policy-card p,
.policy-card li {
  color: var(--muted);
  font-size: 16px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  align-items: center;
  gap: 56px;
}

.glass-list {
  display: grid;
  gap: 12px;
}

.glass-row {
  padding: 18px 20px;
  border: 1px solid rgba(231, 233, 238, 0.86);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 12px 32px rgba(28, 32, 40, 0.06);
}

.glass-row strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
}

.glass-row span {
  color: var(--muted);
}

.showcase-image {
  width: min(100%, 430px);
  display: block;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.support-hero {
  padding: 82px 0 54px;
  background: linear-gradient(180deg, #ffffff 0%, #f7f8fa 100%);
}

.support-hero .section-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.8fr);
  gap: 52px;
  align-items: center;
}

.support-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.support-panel img {
  width: 72px;
  height: 72px;
  margin-bottom: 22px;
}

.support-panel a {
  color: var(--blue);
  font-weight: 650;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.support-card,
.policy-card {
  padding: 24px;
}

.policy-card {
  margin-bottom: 16px;
}

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

.footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  width: min(1120px, calc(100% - 40px));
  min-height: 86px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

@media (max-width: 820px) {
  .nav {
    width: min(100% - 28px, 1120px);
  }

  .nav-links {
    gap: 14px;
  }

  .nav-links .hide-sm {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 54px 0 34px;
  }

  .hero-inner,
  .split,
  .support-hero .section-inner {
    width: min(100% - 28px, 1120px);
    grid-template-columns: 1fr;
    gap: 34px;
  }

  h1 {
    font-size: clamp(48px, 15vw, 68px);
  }

  .product-stage {
    min-height: 0;
  }

  .phone-stack {
    width: min(100%, 460px);
    margin: 0 auto;
  }

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

  .section {
    padding: 58px 0;
  }

  .section-inner {
    width: min(100% - 28px, 1120px);
  }

  .footer-inner {
    width: min(100% - 28px, 1120px);
    padding: 20px 0;
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .brand span {
    display: none;
  }

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

  .button {
    width: 100%;
  }

  .phone-stack {
    grid-template-columns: 1fr;
  }

  .phone-shot.secondary {
    display: none;
  }
}