:root {
  --bg: #071013;
  --bg-soft: #0c1a1e;
  --surface: #ffffff;
  --surface-soft: #f3f8f8;
  --ink: #102025;
  --muted: #587078;
  --line: #dce9e9;
  --brand: #33deef;
  --brand-strong: #16b8c8;
  --mint: #78f2bf;
  --coral: #ff7a59;
  --warning: #f4b942;
  --shadow: 0 20px 55px rgba(4, 22, 27, 0.14);
  --radius: 8px;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--surface);
  line-height: 1.7;
}

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

a {
  color: var(--brand-strong);
  text-decoration: none;
}

a:hover {
  color: #0a8997;
}

.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(7, 16, 19, 0.94);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-weight: 750;
  letter-spacing: 0;
}

.brand img {
  width: 38px;
  height: 38px;
}

.brand small {
  display: block;
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.2;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.76);
  font-size: 15px;
  font-weight: 600;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: #fff;
}

.nav-action {
  padding: 10px 16px;
  color: #071013 !important;
  background: var(--brand);
  border-radius: 6px;
  box-shadow: 0 10px 26px rgba(51, 222, 239, 0.22);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  background: transparent;
  color: #fff;
}

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 78% 14%, rgba(51, 222, 239, 0.18), transparent 28%),
    linear-gradient(135deg, #071013 0%, #0d2227 54%, #143238 100%);
}

.hero .container {
  min-height: 690px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 54px;
  padding: 76px 0 80px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 68px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero p {
  margin: 24px 0 0;
  max-width: 610px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 19px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 32px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--brand);
  color: #061114;
  font: inherit;
  font-size: 15px;
  font-weight: 750;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
  color: #061114;
  box-shadow: 0 14px 30px rgba(22, 184, 200, 0.2);
}

.button.secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.24);
}

.button.secondary:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.button.dark {
  background: var(--bg);
  color: #fff;
}

.button.light {
  background: #fff;
  color: var(--ink);
}

.hero-visual {
  position: relative;
}

.screen-frame {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: #13252a;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.36);
}

.screen-bar {
  height: 34px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 12px;
  background: #182b30;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
}

.dot:nth-child(2) {
  background: var(--warning);
}

.dot:nth-child(3) {
  background: var(--mint);
}

.timeline-card {
  position: absolute;
  right: -18px;
  bottom: -24px;
  width: min(360px, 76%);
  padding: 18px;
  border-radius: var(--radius);
  color: #fff;
  background: rgba(8, 22, 26, 0.9);
  border: 1px solid rgba(120, 242, 191, 0.34);
  box-shadow: var(--shadow);
}

.timeline-card strong {
  display: block;
  margin-bottom: 12px;
}

.timeline {
  display: grid;
  grid-template-columns: 1.2fr 0.7fr 1.6fr 0.8fr;
  gap: 5px;
  height: 42px;
}

.timeline span {
  border-radius: 4px;
  background: linear-gradient(90deg, var(--brand), var(--mint));
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 36px;
}

.stat {
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.stat b {
  display: block;
  color: var(--mint);
  font-size: 28px;
  line-height: 1.2;
}

.stat span {
  color: rgba(255, 255, 255, 0.66);
  font-size: 13px;
}

.section {
  padding: 86px 0;
}

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

.section.dark {
  color: #fff;
  background: var(--bg);
}

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

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

.section h2 {
  margin: 0 0 14px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.12;
  letter-spacing: 0;
}

.section h3 {
  margin: 0 0 10px;
  font-size: 21px;
  line-height: 1.3;
}

.section p {
  margin: 0 0 16px;
  color: var(--muted);
}

.dark p {
  color: rgba(255, 255, 255, 0.72);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, 1fr);
}

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

.feature,
.quote,
.download-option,
.faq-item,
.step,
.scenario {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.feature h3,
.scenario h3,
.step h3,
.faq-item h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 28px;
  border-radius: 6px;
  color: #071013;
  background: var(--mint);
}

.feature p,
.quote p,
.download-option p,
.faq-item p,
.step p,
.scenario p {
  margin-bottom: 0;
}

.split {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 46px;
  align-items: center;
}

.media-panel {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-soft);
  box-shadow: var(--shadow);
}

.media-panel figcaption {
  padding: 14px 16px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.use-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.use-list li {
  padding: 16px 18px;
  border-left: 4px solid var(--brand);
  background: #fff;
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: 0 8px 20px rgba(16, 32, 37, 0.06);
}

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

.quote {
  position: relative;
  min-height: 210px;
}

.quote::before {
  content: '"';
  display: block;
  color: var(--brand-strong);
  font-family: Georgia, serif;
  font-size: 48px;
  line-height: 0.7;
}

.quote cite {
  display: block;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
  font-style: normal;
}

.cta-band {
  padding: 54px 0;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(51, 222, 239, 0.16), transparent 42%),
    var(--bg);
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.cta-inner h2 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
}

.cta-inner p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
}

.download-option {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 240px;
}

.download-option .button-row {
  margin-top: 22px;
}

.note {
  padding: 18px;
  border-left: 4px solid var(--warning);
  background: #fff8e7;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: #5b4307;
}

.site-footer {
  color: rgba(255, 255, 255, 0.68);
  background: #061114;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(2, 1fr);
  gap: 28px;
  padding: 60px 0;
}

.site-footer h2,
.site-footer h3 {
  margin: 0 0 12px;
  color: #fff;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  display: block;
  margin: 7px 0;
  color: rgba(255, 255, 255, 0.72);
}

.footer-bottom {
  padding: 18px 0 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 22px;
  background: rgba(3, 10, 12, 0.72);
}

.modal.is-open {
  display: flex;
}

.modal-panel {
  width: min(780px, 100%);
  max-height: calc(100vh - 44px);
  overflow: auto;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.35);
}

.modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 28px 8px;
}

.modal-head h2 {
  margin: 0;
  font-size: 28px;
}

.modal-close {
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.modal-body {
  padding: 0 28px 28px;
}

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

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

.qr-card img {
  width: 168px;
  margin: 0 auto 12px;
}

.direct-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 18px;
}

.direct-links a {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font-weight: 700;
}

.crumb {
  color: rgba(255, 255, 255, 0.64);
  font-size: 14px;
  margin-bottom: 14px;
}

.page-hero {
  color: #fff;
  background: linear-gradient(135deg, #071013, #143238);
}

.page-hero .container {
  padding: 84px 0;
}

.page-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(40px, 6vw, 66px);
  line-height: 1.05;
}

.page-hero p {
  max-width: 760px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 19px;
}

.table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.table th,
.table td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.table th {
  background: var(--surface-soft);
  color: var(--ink);
}

.table tr:last-child td {
  border-bottom: 0;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 14px 20px 22px;
    background: #071013;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 0;
  }

  .hero .container,
  .split,
  .grid.two,
  .grid.three,
  .quotes,
  .footer-grid,
  .cta-inner {
    grid-template-columns: 1fr;
  }

  .hero .container {
    min-height: auto;
    padding-top: 54px;
  }

  .stats,
  .qr-grid,
  .direct-links {
    grid-template-columns: 1fr;
  }

  .cta-inner {
    display: block;
  }

  .timeline-card {
    position: static;
    width: 100%;
    margin-top: 14px;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 28px, var(--max));
  }

  .section {
    padding: 62px 0;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 40px;
  }

  .hero p,
  .page-hero p {
    font-size: 17px;
  }

  .feature,
  .quote,
  .download-option,
  .faq-item,
  .step,
  .scenario {
    padding: 20px;
  }

  .modal-head,
  .modal-body {
    padding-left: 18px;
    padding-right: 18px;
  }
}