@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@500;600;700;800&display=swap");

:root {
  --bg: #edf1f2;
  --paper: #f8fafb;
  --surface: rgba(255, 255, 255, 0.8);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --ink: #11242a;
  --muted: #5f6f76;
  --line: rgba(17, 36, 42, 0.1);
  --line-strong: rgba(17, 36, 42, 0.16);
  --teal: #0e7b72;
  --teal-deep: #0a4f4c;
  --blue: #275f9c;
  --gold: #c98f34;
  --shadow: 0 18px 50px rgba(12, 29, 34, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(248, 250, 251, 0.95), rgba(237, 241, 242, 1)),
    var(--bg);
  font-family: "Manrope", "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  letter-spacing: 0;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

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

h1,
h2,
h3 {
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: 68px;
  line-height: 1.04;
  font-weight: 800;
}

h2 {
  margin-bottom: 14px;
  font-size: 40px;
  line-height: 1.1;
  font-weight: 700;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  line-height: 1.15;
  font-weight: 700;
}

p {
  line-height: 1.8;
}

.page-shell {
  width: min(1280px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  border-bottom: 1px solid transparent;
  background: rgba(245, 248, 249, 0.86);
  backdrop-filter: blur(18px);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.site-header.is-elevated {
  border-bottom-color: var(--line);
  background: rgba(245, 248, 249, 0.96);
  box-shadow: 0 10px 28px rgba(13, 31, 35, 0.08);
}

.nav-shell {
  width: min(1320px, calc(100% - 40px));
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(11, 51, 54, 0.18);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-text span:last-child {
  margin-top: 4px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  flex: 1;
}

.top-nav a {
  position: relative;
  padding: 6px 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.top-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  border-radius: 999px;
  background: transparent;
  transition: background 0.18s ease;
}

.top-nav a:hover,
.top-nav a.active {
  color: var(--ink);
}

.top-nav a:hover::after,
.top-nav a.active::after {
  background: linear-gradient(90deg, var(--teal), var(--blue));
}

.nav-cta,
.btn,
.platform-cta,
.download-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 800;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.nav-cta,
.btn-primary,
.download-link {
  color: #fff;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  box-shadow: 0 10px 18px rgba(16, 83, 94, 0.18);
}

.nav-cta:hover,
.btn-primary:hover,
.download-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 24px rgba(16, 83, 94, 0.22);
}

.btn-secondary,
.platform-cta {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.84);
  color: var(--ink);
}

.btn-secondary:hover,
.platform-cta:hover {
  transform: translateY(-1px);
  border-color: rgba(14, 123, 114, 0.22);
  background: rgba(255, 255, 255, 0.96);
}

.icon-btn {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  box-shadow: 0 0 0 5px rgba(14, 123, 114, 0.12);
}

.muted {
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.72s ease, transform 0.72s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hero,
.download-hero {
  position: relative;
  overflow: hidden;
}

.hero {
  min-height: calc(100vh - 78px);
  display: flex;
  align-items: center;
}

.hero::before,
.download-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  transform: scale(1.03);
}

.hero::before {
  background-image:
    linear-gradient(90deg, rgba(243, 247, 248, 0.94) 0%, rgba(243, 247, 248, 0.88) 36%, rgba(243, 247, 248, 0.2) 100%),
    url("hero-scene.png");
  animation: sceneShift 28s ease-in-out infinite alternate;
}

.hero::after,
.download-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0)),
    repeating-linear-gradient(90deg, rgba(13, 32, 36, 0.04) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(13, 32, 36, 0.04) 0 1px, transparent 1px 80px);
  opacity: 0.35;
  pointer-events: none;
}

.hero-layout,
.download-layout {
  position: relative;
  z-index: 1;
  width: min(1320px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  align-items: center;
  gap: 30px;
}

.hero-layout {
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  padding: 60px 0 72px;
}

.hero-copy {
  max-width: 720px;
}

.hero-copy h1 {
  max-width: 640px;
}

.hero-copy .lede,
.section-lead,
.download-copy .lede,
.detail-text,
.faq-panel p {
  color: var(--muted);
  font-size: 17px;
}

.hero-actions,
.platform-strip,
.meta-row,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-actions {
  margin: 28px 0 22px;
}

.platform-strip {
  margin-top: 18px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.chip .icon-btn {
  color: var(--teal);
}

.hero-panel {
  position: relative;
  border: 1px solid rgba(17, 36, 42, 0.1);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.74);
  box-shadow: var(--shadow);
  overflow: hidden;
  backdrop-filter: blur(16px);
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.05)),
    radial-gradient(circle at top right, rgba(39, 95, 156, 0.1), transparent 36%);
  pointer-events: none;
}

.hero-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 18px 14px;
}

.hero-panel-head strong {
  font-size: 16px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(14, 123, 114, 0.1);
  color: var(--teal-deep);
  font-size: 12px;
  font-weight: 800;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #41c08d;
  box-shadow: 0 0 0 5px rgba(65, 192, 141, 0.16);
  animation: pulse 2.8s ease-in-out infinite;
}

.hero-scene {
  position: relative;
  margin: 0 18px;
  min-height: 390px;
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(8, 19, 28, 0.08), rgba(8, 19, 28, 0.16));
}

.hero-scene img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.02) contrast(1.04);
}

.hero-scene::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.02), rgba(7, 27, 31, 0.28));
}

.scene-note {
  position: absolute;
  left: 18px;
  bottom: 18px;
  z-index: 1;
  max-width: 240px;
  padding: 14px 16px;
  border-radius: 10px;
  background: rgba(8, 21, 28, 0.72);
  color: #f3fbfd;
  backdrop-filter: blur(14px);
}

.scene-note strong {
  display: block;
  margin-bottom: 4px;
  font-size: 17px;
}

.scene-note span {
  color: rgba(243, 251, 253, 0.76);
  font-size: 13px;
  line-height: 1.6;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  padding: 16px 18px 18px;
}

.metric {
  padding: 13px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

.metric strong {
  display: block;
  margin-bottom: 5px;
  font-size: 18px;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.trust-strip {
  padding: 18px 0 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 18px;
  align-items: center;
  padding: 22px 0 12px;
  border-top: 1px solid var(--line);
}

.trust-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.trust-metric {
  padding: 16px 16px 18px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
}

.trust-metric strong {
  display: block;
  margin-bottom: 4px;
  font-size: 20px;
}

.trust-metric span {
  color: var(--muted);
  font-size: 12px;
}

.band {
  padding: 58px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 24px;
}

.section-head h2 {
  max-width: 640px;
  margin-bottom: 0;
}

.section-head p {
  max-width: 420px;
  margin-bottom: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  min-height: 220px;
  padding: 22px 20px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(13, 31, 35, 0.05);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  margin-bottom: 14px;
  background: linear-gradient(135deg, rgba(14, 123, 114, 0.1), rgba(39, 95, 156, 0.12));
  color: var(--teal);
}

.feature-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.glance-band {
  padding: 26px 0 54px;
}

.glance-frame {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid rgba(17, 36, 42, 0.08);
  background:
    linear-gradient(180deg, rgba(8, 22, 28, 0.8), rgba(8, 22, 28, 0.76)),
    url("download-scene.png") center/cover no-repeat;
  box-shadow: var(--shadow);
}

.glance-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 22px;
  padding: 28px;
  min-height: 320px;
}

.glance-copy {
  max-width: 590px;
  color: #f4fbfd;
}

.glance-copy .eyebrow,
.download-copy .eyebrow {
  color: #8de1cf;
}

.glance-copy .eyebrow::before,
.download-copy .eyebrow::before {
  box-shadow: 0 0 0 5px rgba(142, 225, 207, 0.14);
}

.glance-copy h2 {
  color: #ffffff;
}

.glance-copy p {
  color: rgba(243, 251, 253, 0.8);
  max-width: 560px;
}

.signal-list {
  display: grid;
  gap: 10px;
}

.signal {
  padding: 14px 14px 15px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.08);
  color: #eff8fb;
}

.signal strong {
  display: block;
  margin-bottom: 4px;
  font-size: 18px;
}

.signal span {
  color: rgba(239, 248, 251, 0.74);
  font-size: 12px;
}

.download-hero {
  padding: 54px 0 22px;
}

.download-hero::before {
  background-image:
    linear-gradient(90deg, rgba(244, 248, 249, 0.96) 0%, rgba(244, 248, 249, 0.9) 44%, rgba(244, 248, 249, 0.45) 100%),
    url("download-scene.png");
  animation: sceneShift 22s ease-in-out infinite alternate;
}

.download-layout {
  grid-template-columns: minmax(0, 0.98fr) minmax(360px, 1.02fr);
  padding: 22px 0 10px;
}

.download-copy h1 {
  max-width: 560px;
}

.release-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.release-tag {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.release-panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow);
}

.release-panel img {
  width: 100%;
  height: 100%;
  min-height: 390px;
  object-fit: cover;
}

.release-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(10, 28, 31, 0.24));
}

.release-card {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 18px;
  z-index: 1;
  padding: 18px;
  border-radius: 12px;
  background: rgba(9, 24, 28, 0.72);
  color: #f4fbfd;
  backdrop-filter: blur(14px);
}

.release-card strong {
  display: block;
  margin-bottom: 4px;
  font-size: 24px;
}

.release-card p {
  margin-bottom: 0;
  color: rgba(244, 251, 253, 0.78);
  font-size: 13px;
}

.download-band {
  padding: 48px 0 20px;
}

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

.download-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(13, 31, 35, 0.05);
}

.platform-line {
  display: flex;
  align-items: center;
  gap: 14px;
}

.platform-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(14, 123, 114, 0.1), rgba(39, 95, 156, 0.12));
  color: var(--teal);
  flex: 0 0 auto;
}

.platform-meta {
  display: grid;
  gap: 3px;
}

.platform-meta strong {
  font-size: 20px;
}

.platform-meta span {
  color: var(--muted);
  font-size: 13px;
}

.platform-detail {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}

.platform-detail span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.platform-detail span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--blue));
}

.download-actions {
  justify-content: flex-end;
}

.install-band {
  padding: 34px 0 18px;
}

.install-grid {
  display: grid;
  grid-template-columns: 1fr 0.88fr;
  gap: 18px;
}

.install-panel,
.faq-panel,
.status-panel {
  padding: 22px 20px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(13, 31, 35, 0.05);
}

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

.step {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.step strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(14, 123, 114, 0.12), rgba(39, 95, 156, 0.12));
  color: var(--teal-deep);
  font-size: 13px;
  font-weight: 800;
}

.step p {
  margin-bottom: 0;
  color: var(--muted);
}

.status-panel strong {
  display: block;
  margin-bottom: 8px;
  font-size: 28px;
}

.status-panel .status-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--teal-deep);
  font-size: 13px;
  font-weight: 800;
}

.faq-band {
  padding: 24px 0 60px;
}

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

.faq-panel summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  list-style: none;
  cursor: pointer;
  font-size: 17px;
  font-weight: 800;
}

.faq-panel summary::-webkit-details-marker {
  display: none;
}

.faq-panel summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--teal);
  font-size: 20px;
  font-weight: 800;
}

.faq-panel[open] summary::after {
  content: "−";
}

.faq-panel p {
  margin: 14px 0 0;
}

.site-footer {
  padding: 22px 0 34px;
  border-top: 1px solid var(--line);
  background: rgba(248, 250, 251, 0.72);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-inner p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(0.88);
  }
}

@keyframes sceneShift {
  0% {
    background-position: 50% 48%;
  }
  100% {
    background-position: 54% 52%;
  }
}

@media (max-width: 1120px) {
  h1 {
    font-size: 56px;
  }

  h2 {
    font-size: 34px;
  }

  .hero-layout,
  .download-layout,
  .trust-grid,
  .glance-grid,
  .install-grid {
    grid-template-columns: 1fr;
  }

  .hero-layout {
    padding-top: 42px;
  }

  .hero-copy,
  .download-copy {
    max-width: none;
  }

  .glance-grid {
    min-height: 0;
  }
}

@media (max-width: 860px) {
  .nav-shell {
    flex-wrap: wrap;
    padding: 12px 0;
  }

  .top-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero {
    min-height: auto;
  }

  .hero-layout {
    padding: 30px 0 44px;
  }

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

  .download-row {
    grid-template-columns: 1fr;
  }

  .download-actions {
    justify-content: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .page-shell,
  .nav-shell {
    width: min(100% - 28px, 1280px);
  }

  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 28px;
  }

  h3 {
    font-size: 18px;
  }

  .hero-actions,
  .release-row,
  .download-actions {
    width: 100%;
  }

  .btn,
  .nav-cta,
  .platform-cta,
  .download-link {
    width: 100%;
  }

  .hero-scene,
  .release-panel img {
    min-height: 260px;
  }

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

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .glance-grid {
    padding: 20px;
  }

  .release-card {
    left: 14px;
    right: 14px;
    bottom: 14px;
  }
}