:root {
  color-scheme: light;
  --bg: #ffffff;
  --page: #f7f8fa;
  --text: #20242c;
  --muted: #68707d;
  --line: #e7e9ee;
  --warm: #e87722;
  --warm-dark: #c95f14;
  --warm-soft: #fff3e8;
  --green: #16a673;
  --blue: #2f6fed;
  --shadow: 0 18px 50px rgba(32, 36, 44, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

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

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(231, 233, 238, 0.85);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 900;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(232, 119, 34, 0.18);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(340px, 0.78fr);
  gap: clamp(34px, 6vw, 90px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(48px, 7vw, 98px) clamp(20px, 5vw, 72px) 72px;
  background:
    radial-gradient(circle at 78% 22%, rgba(232, 119, 34, 0.14), transparent 34%),
    linear-gradient(180deg, #fffaf6 0%, #ffffff 52%, #f8fafc 100%);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--warm);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(64px, 8vw, 118px);
  line-height: 0.95;
  letter-spacing: 0;
}

.lead {
  max-width: 680px;
  margin-bottom: 34px;
  color: #49515d;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.65;
  font-weight: 700;
}

.hero-actions,
.download-section {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.primary-action,
.secondary-action {
  min-height: 52px;
  border-radius: 999px;
  padding: 0 28px;
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 900;
  cursor: pointer;
}

.primary-action {
  color: #ffffff;
  background: var(--warm);
  box-shadow: 0 14px 30px rgba(232, 119, 34, 0.28);
}

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

.secondary-action {
  display: inline-flex;
  align-items: center;
  color: var(--text);
  background: #ffffff;
  border-color: var(--line);
}

.download-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 14px;
}

.phone-preview {
  width: min(100%, 430px);
  margin: 0 auto;
  padding: 20px 18px 24px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 42px;
  box-shadow: var(--shadow);
}

.phone-status,
.phone-tabs,
.tag-row {
  display: flex;
  align-items: center;
}

.phone-status {
  justify-content: space-between;
  margin-bottom: 22px;
  padding: 2px 14px;
  color: #111827;
  font-size: 13px;
  font-weight: 800;
}

.phone-tabs {
  gap: 18px;
  margin-bottom: 18px;
  padding: 0 12px;
  font-size: 24px;
}

.phone-tabs strong {
  position: relative;
}

.phone-tabs strong::after {
  position: absolute;
  left: 2px;
  right: 2px;
  bottom: -8px;
  height: 4px;
  content: "";
  background: #111827;
  border-radius: 999px;
}

.phone-tabs span {
  color: #9aa3af;
  font-weight: 800;
}

.search-dot {
  width: 30px;
  height: 30px;
  margin-left: auto;
  border: 3px solid #111827;
  border-radius: 999px;
}

.tag-row {
  gap: 10px;
  overflow: hidden;
  margin-bottom: 18px;
}

.tag-row span {
  flex: 0 0 auto;
  padding: 8px 15px;
  background: #f2f3f5;
  border-radius: 999px;
  color: #4b5563;
  font-size: 14px;
  font-weight: 800;
}

.tag-row .active {
  color: #ffffff;
  background: #111827;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.card-grid article {
  overflow: hidden;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(32, 36, 44, 0.08);
}

.card-grid img {
  display: block;
  width: 100%;
  aspect-ratio: 1.1 / 1;
  object-fit: cover;
}

.card-grid strong,
.card-grid span {
  display: block;
  padding: 0 12px;
}

.card-grid strong {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.45;
}

.card-grid span {
  margin: 5px 0 12px;
  color: var(--warm);
  font-size: 12px;
  font-weight: 900;
}

.section {
  padding: 84px clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 860px;
  margin-bottom: 34px;
}

.section-heading h2,
.download-section h2 {
  margin-bottom: 14px;
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.15;
}

.section-heading p,
.download-section p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

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

.feature-card,
.safety-grid article,
.process div {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 14px 34px rgba(32, 36, 44, 0.06);
}

.feature-card {
  overflow: hidden;
}

.feature-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1.45 / 1;
  object-fit: cover;
}

.feature-card h3,
.feature-card p {
  padding: 0 22px;
}

.feature-card h3 {
  margin: 22px 0 10px;
  font-size: 22px;
}

.feature-card p,
.safety-grid p,
.process p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.feature-card p {
  margin-bottom: 24px;
}

.process-section,
.safety-section {
  background: var(--page);
}

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

.process div,
.safety-grid article {
  padding: 26px;
}

.process span {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  place-items: center;
  color: #ffffff;
  background: var(--warm);
  border-radius: 14px;
  font-size: 18px;
  font-weight: 900;
}

.process h3,
.safety-grid h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.download-section {
  margin: 84px clamp(20px, 5vw, 72px);
  padding: clamp(32px, 5vw, 54px);
  justify-content: space-between;
  background: var(--warm-soft);
  border: 1px solid rgba(232, 119, 34, 0.28);
  border-radius: 34px;
}

.download-section div {
  max-width: 820px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 32px clamp(20px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer div {
  display: flex;
  gap: 12px;
}

.site-footer strong {
  color: var(--text);
}

.site-footer p {
  margin: 0;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 50;
  max-width: min(calc(100vw - 36px), 520px);
  transform: translateX(-50%);
  padding: 14px 18px;
  color: #ffffff;
  background: rgba(32, 36, 44, 0.94);
  border-radius: 999px;
  box-shadow: var(--shadow);
  font-size: 15px;
  font-weight: 800;
  text-align: center;
}

@media (max-width: 980px) {
  .site-header {
    position: static;
  }

  .nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

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

@media (max-width: 620px) {
  .hero,
  .section {
    padding-left: 18px;
    padding-right: 18px;
  }

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

  .phone-preview {
    border-radius: 30px;
  }

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