:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-strong: #f4f1ec;
  --text: #201a17;
  --muted: #6b625c;
  --line: #e5ded5;
  --read: #e45b31;
  --digest: #8c4ee8;
  --insight: #0e9488;
  --ink: #111827;
  --shadow: 0 18px 50px rgba(58, 42, 29, 0.12);
  --radius: 8px;
  font-family: Inter, "MiSans", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

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

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

p {
  margin: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 247, 0.92);
  border-bottom: 1px solid rgba(229, 222, 213, 0.8);
  backdrop-filter: blur(16px);
}

.nav-wrap {
  max-width: 1180px;
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 22px;
}

.brand img {
  width: 42px;
  height: 42px;
}

.brand span {
  background: linear-gradient(100deg, var(--read), var(--digest), var(--insight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

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

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
}

.actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(105deg, var(--read), var(--digest));
  box-shadow: 0 12px 26px rgba(228, 91, 49, 0.25);
}

.btn-secondary {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
}

.icon-btn {
  width: 44px;
  padding: 0;
}

.mobile-toggle {
  display: none;
}

.section {
  padding: 88px 24px;
}

.section.tight {
  padding-top: 58px;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  align-items: center;
  padding: 72px 24px 48px;
  overflow: hidden;
}

.hero-grid,
.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(380px, 1.05fr);
  gap: 54px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  color: var(--read);
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 16px;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.12;
}

h1 {
  font-size: clamp(42px, 6vw, 76px);
  max-width: 820px;
}

h2 {
  font-size: clamp(30px, 4vw, 52px);
  max-width: 760px;
}

h3 {
  font-size: 22px;
}

.lead {
  margin-top: 22px;
  max-width: 670px;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.proof-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 14px;
}

.proof-row span {
  border-left: 3px solid var(--insight);
  padding-left: 10px;
}

.device-frame {
  position: relative;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(228, 91, 49, 0.16), rgba(14, 148, 136, 0.16));
  padding: 16px;
  box-shadow: var(--shadow);
}

.device-frame img {
  border-radius: 12px;
  background: #fff;
  border: 1px solid rgba(255, 255, 255, 0.7);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 36px;
  margin-bottom: 36px;
}

.section-head p {
  max-width: 520px;
  color: var(--muted);
}

.band {
  background: var(--surface-strong);
}

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

.feature-card,
.quote-card,
.download-panel,
.faq-item,
.source-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.feature-card {
  padding: 26px;
}

.feature-card svg,
.scenario-icon {
  width: 38px;
  height: 38px;
  color: var(--read);
  margin-bottom: 18px;
}

.feature-card p,
.quote-card p,
.download-panel p,
.faq-item p,
.source-card p {
  color: var(--muted);
  margin-top: 10px;
}

.media-strip {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 22px;
  align-items: stretch;
}

.media-strip img {
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.scenario-list {
  display: grid;
  gap: 18px;
}

.scenario-row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.scenario-row:last-child {
  border-bottom: 0;
}

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

.quote-card {
  padding: 26px;
}

.quote-card strong {
  display: block;
  margin-top: 18px;
  color: var(--text);
}

.download-panel,
.source-card {
  padding: 26px;
}

.download-panel .btn {
  width: 100%;
  margin-top: 20px;
}

.platform-list {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.platform-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.platform-link:last-child {
  border-bottom: 0;
}

.platform-link span {
  color: var(--muted);
  font-size: 14px;
}

.page-hero {
  padding: 72px 24px 42px;
  background: linear-gradient(135deg, rgba(228, 91, 49, 0.1), rgba(14, 148, 136, 0.08));
}

.page-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.55fr);
  gap: 42px;
  align-items: center;
}

.page-hero img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.75);
}

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

.faq-item {
  padding: 24px;
}

.cta-band {
  background: var(--ink);
  color: #fff;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.72);
}

.site-footer {
  padding: 44px 24px;
  background: #171717;
  color: rgba(255, 255, 255, 0.72);
}

.footer-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
}

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

.footer-links a:hover {
  color: #fff;
}

.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(16, 14, 12, 0.68);
}

.modal-dialog {
  position: relative;
  width: min(720px, 100%);
  background: var(--surface);
  border-radius: 12px;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.25);
  padding: 30px;
}

.modal-top {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
  margin-bottom: 22px;
}

.modal-top p {
  color: var(--muted);
  margin-top: 6px;
}

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

.qr-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: center;
}

.qr-card img {
  width: 180px;
  height: 180px;
  margin: 0 auto 12px;
}

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

.modal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.modal-links a {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: #fff;
  padding: 8px 12px;
  z-index: 200;
}

.skip-link:focus {
  left: 8px;
}

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

.version-item {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  gap: 22px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.version-item:last-child {
  border-bottom: 0;
}

.version-tag {
  color: var(--read);
  font-weight: 800;
  font-size: 20px;
}

.version-date {
  display: block;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  margin-top: 4px;
}

.version-item p {
  color: var(--muted);
  margin-top: 8px;
}

.version-link {
  color: var(--insight);
  font-weight: 700;
  white-space: nowrap;
}

@media (max-width: 960px) {
  .main-nav,
  .actions .btn-primary {
    display: none;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .main-nav.is-open {
    display: flex;
    position: absolute;
    left: 24px;
    right: 24px;
    top: 72px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 18px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

  .hero-grid,
  .split-grid,
  .media-strip,
  .page-hero .container {
    grid-template-columns: 1fr;
  }

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

  .section-head {
    display: block;
  }

  .section-head p {
    margin-top: 16px;
  }

  .version-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

@media (max-width: 640px) {
  .nav-wrap {
    padding: 0 16px;
  }

  .hero,
  .section,
  .page-hero {
    padding-left: 16px;
    padding-right: 16px;
  }

  .feature-grid,
  .quote-grid,
  .download-grid,
  .source-grid,
  .qr-grid {
    grid-template-columns: 1fr;
  }

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

  .modal-dialog {
    padding: 22px;
  }

  .qr-card img {
    width: 154px;
    height: 154px;
  }
}