:root {
  --bg: #f5efe6;
  --surface: rgba(255, 250, 243, 0.78);
  --surface-strong: rgba(255, 253, 248, 0.92);
  --surface-deep: #f1e6d8;
  --text: #18222d;
  --muted: #5e6a76;
  --line: rgba(24, 34, 45, 0.1);
  --line-strong: rgba(24, 34, 45, 0.18);
  --accent: #b86a47;
  --accent-deep: #7d432d;
  --accent-soft: rgba(184, 106, 71, 0.1);
  --shadow-xl: 0 34px 90px rgba(86, 63, 42, 0.14);
  --shadow-md: 0 18px 44px rgba(76, 57, 40, 0.1);
  --radius-xl: 34px;
  --radius-lg: 26px;
  --radius-md: 18px;
  --button: #18222d;
  --button-hover: #2c3a47;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 10% 12%, rgba(184, 106, 71, 0.18), transparent 24%),
    radial-gradient(circle at 88% 18%, rgba(119, 136, 92, 0.14), transparent 20%),
    linear-gradient(180deg, #fbf6ef 0%, #f3eadf 46%, #ece2d6 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(24, 34, 45, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 34, 45, 0.022) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 92%);
}

.ambient {
  position: fixed;
  border-radius: 999px;
  filter: blur(80px);
  pointer-events: none;
  opacity: 0.75;
}

.ambient-left {
  top: 90px;
  left: -20px;
  width: 220px;
  height: 220px;
  background: rgba(184, 106, 71, 0.14);
}

.ambient-right {
  top: 180px;
  right: 0;
  width: 260px;
  height: 260px;
  background: rgba(126, 143, 110, 0.12);
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.topbar,
.hero,
.panel,
.footer {
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-xl);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding: 16px 22px;
  border-radius: 999px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #e0b07a);
  box-shadow: 0 0 0 6px rgba(184, 106, 71, 0.12);
}

.brand-name,
.topbar-note,
.section-kicker,
.eyebrow,
.timeline-step {
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand-name {
  font-size: 14px;
  font-weight: 700;
}

.topbar-note {
  font-size: 12px;
  color: var(--muted);
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease;
}

.topbar-links a:hover {
  background: rgba(255, 255, 255, 0.68);
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 28px;
  padding: 34px;
  border-radius: var(--radius-xl);
}

.hero-copy,
.hero-summary,
.summary-grid,
.content-stack {
  display: grid;
  gap: 18px;
}

.hero-copy {
  align-content: center;
  padding: 12px 8px 12px 4px;
}

.eyebrow,
.section-kicker {
  margin: 0;
  font-size: 12px;
  color: var(--accent-deep);
}

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

h1 {
  max-width: 760px;
  font-size: 82px;
  line-height: 0.96;
  letter-spacing: 0;
}

.lead {
  max-width: 700px;
  font-size: 18px;
  line-height: 1.9;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.action-chip,
.primary-action,
.download-button,
.feature-index,
.footer-meta span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
}

.primary-action {
  min-height: 44px;
  padding: 0 18px;
  background: var(--button);
  color: #fffaf3;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 16px 34px rgba(24, 34, 45, 0.16);
  transition: transform 0.2s ease, background 0.2s ease;
}

.primary-action:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

.action-chip {
  padding: 11px 16px;
  border: 1px solid rgba(184, 106, 71, 0.14);
  background: rgba(255, 255, 255, 0.55);
  color: var(--accent-deep);
  font-size: 13px;
}

.summary-card,
.card,
.download-card,
.timeline-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow-md);
}

.hero-summary {
  align-content: start;
}

.summary-card {
  padding: 22px;
}

.summary-primary {
  padding: 26px;
  background:
    linear-gradient(180deg, rgba(255, 252, 248, 0.96), rgba(246, 237, 226, 0.96));
}

.summary-label {
  margin-bottom: 12px;
  color: var(--accent-deep);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.summary-title {
  margin-bottom: 10px;
  font-size: 28px;
  font-weight: 800;
  line-height: 1.15;
}

.summary-card p:last-child,
.card p,
.section-note,
.timeline-body p:last-child,
.footer-text {
  color: var(--muted);
  line-height: 1.85;
}

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

.summary-number {
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent-deep);
}

.summary-card h2 {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.15;
}

.content-stack {
  margin-top: 22px;
}

.panel {
  padding: 32px;
  border-radius: var(--radius-xl);
}

.intro-panel,
.process-panel {
  background: rgba(255, 251, 245, 0.76);
}

.download-panel {
  background:
    linear-gradient(135deg, rgba(255, 253, 248, 0.92), rgba(243, 232, 218, 0.88));
}

.feature-panel {
  background:
    linear-gradient(180deg, rgba(248, 240, 230, 0.9), rgba(255, 252, 247, 0.84));
}

.section-heading {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.section-heading.split {
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: end;
  gap: 20px;
}

h2 {
  font-size: 50px;
  line-height: 1.08;
  letter-spacing: 0;
}

.section-note {
  font-size: 15px;
}

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

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

.download-card {
  display: grid;
  align-content: space-between;
  min-height: 286px;
  padding: 24px;
}

.download-card h3 {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.15;
}

.download-card p {
  color: var(--muted);
  line-height: 1.75;
}

.download-platform {
  margin-bottom: 14px;
  color: var(--accent-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.download-button {
  width: 100%;
  min-height: 46px;
  background: var(--button);
  color: #fffaf3;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

.download-button:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

.download-button.is-disabled {
  pointer-events: none;
  background: rgba(24, 34, 45, 0.18);
  color: rgba(24, 34, 45, 0.55);
  box-shadow: none;
}

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

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  padding: 24px;
}

.card h3,
.timeline-body h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.feature-card {
  min-height: 214px;
}

.feature-index {
  width: 50px;
  height: 50px;
  margin-bottom: 18px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-weight: 700;
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 20px;
  padding: 20px;
}

.timeline-line {
  position: relative;
  display: block;
  width: 18px;
  height: 100%;
  margin: 2px auto 0;
}

.timeline-line::before,
.timeline-line::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.timeline-line::before {
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(184, 106, 71, 0.45), rgba(184, 106, 71, 0.08));
}

.timeline-line::after {
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #d6a06d);
  box-shadow: 0 0 0 7px rgba(184, 106, 71, 0.1);
}

.timeline-body {
  display: grid;
  gap: 8px;
}

.timeline-step {
  font-size: 11px;
  color: var(--accent-deep);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 22px;
  padding: 22px 26px;
  border-radius: 24px;
}

.footer-title {
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 700;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-meta span {
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
  color: var(--muted);
  font-size: 12px;
}

.footer-icp {
  width: 100%;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.6;
}

.footer-icp a {
  color: var(--muted);
  text-decoration: none;
}

.footer-icp a:hover {
  color: var(--text);
}

@media (max-width: 980px) {
  .hero,
  .section-heading.split,
  .download-grid,
  .grid.two,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 26px;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 14px;
  }

  .topbar,
  .panel,
  .hero,
  .footer {
    border-radius: 22px;
  }

  .topbar,
  .footer {
    padding: 16px;
  }

  .panel,
  .hero {
    padding: 20px;
  }

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

  .topbar-links {
    width: 100%;
    justify-content: space-between;
  }

  .topbar-links a {
    flex: 1;
    justify-content: center;
    padding: 0 10px;
  }

  h1 {
    font-size: 42px;
  }

  h2 {
    font-size: 31px;
  }

  .lead,
  .summary-text,
  .summary-card p:last-child,
  .card p,
  .timeline-body p:last-child,
  .footer-text {
    font-size: 15px;
    line-height: 1.75;
  }

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

  .download-card {
    min-height: auto;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline-line {
    width: 100%;
    height: 18px;
    margin: 0;
  }

  .timeline-line::before {
    top: 50%;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: 1px;
    transform: none;
  }

  .timeline-line::after {
    top: 50%;
    left: 10px;
    transform: translateY(-50%);
  }
}