:root {
  --bg: #f7f8f4;
  --surface: #ffffff;
  --surface-soft: #eef2ec;
  --ink: #20241f;
  --ink-secondary: #4f564e;
  --muted: #7d857b;
  --accent: #0d7a67;
  --accent-dark: #0a5f54;
  --accent-soft: #e0f1ea;
  --line: rgba(32, 36, 31, 0.1);
  --shadow-md: 0 18px 50px rgba(24, 40, 32, 0.1), 0 3px 12px rgba(24, 40, 32, 0.05);
  --radius: 16px;
  --font: 'Segoe UI Variable Text', 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', system-ui, sans-serif;
  --mono: 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(1100px 520px at 78% -8%, rgba(13, 122, 103, 0.1), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 1px 6px;
  border-radius: 5px;
  background: var(--surface-soft);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 28px;
  backdrop-filter: blur(14px);
  background: rgba(247, 248, 244, 0.82);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
  color: var(--ink-secondary);
}

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

.nav-download {
  padding: 7px 14px;
  border-radius: 9px;
  background: var(--ink);
  color: #fff !important;
  font-weight: 600;
}

.nav-download:hover {
  background: var(--accent-dark);
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px 40px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1.18fr);
  gap: 54px;
  align-items: center;
  padding: 58px 0 84px;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(36px, 4.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 750;
}

.lede {
  margin: 22px 0 0;
  max-width: 30em;
  font-size: 17px;
  color: var(--ink-secondary);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 11px;
  font-size: 15px;
  font-weight: 650;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

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

.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(13, 122, 103, 0.26);
}

.button.primary:hover {
  background: var(--accent-dark);
}

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

.button.ghost {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
  color: var(--ink-secondary);
}

.button-icon {
  font-size: 17px;
  line-height: 1;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 34px;
  margin: 36px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.hero-meta dt {
  font-size: 12px;
  color: var(--muted);
}

.hero-meta dd {
  margin: 2px 0 0;
  font-size: 14px;
  font-weight: 650;
  color: var(--ink);
}

.hero-shot {
  margin: 0;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  background: #f1f3ee;
}

.window-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #d5d9d0;
}

.window-bar em {
  margin-left: 8px;
  font-style: normal;
  font-size: 12px;
  color: var(--muted);
}

.hero-shot img {
  display: block;
  width: 100%;
  height: auto;
}

.features,
.update,
.install {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: 620px;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 720;
}

.section-lede {
  margin: 14px 0 0;
  color: var(--ink-secondary);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}

.feature-card {
  padding: 24px 22px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.feature-icon.green {
  background: #e4f2e6;
  color: #2f6b43;
}

.feature-icon.blue {
  background: #e5edf9;
  color: #2d5d9b;
}

.feature-icon.amber {
  background: #fbefdd;
  color: #8a5a1c;
}

.feature-icon.violet {
  background: #ece8f8;
  color: #5a4b96;
}

.feature-icon.orange {
  background: #fbe9e1;
  color: #a05a35;
}

.feature-icon.sky {
  background: #e2f1f4;
  color: #26697a;
}

.feature-icon.rose {
  background: #fbe6ee;
  color: #9c3760;
}

.feature-card h3 {
  margin: 16px 0 7px;
  font-size: 17px;
  font-weight: 680;
}

.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-secondary);
}

.principles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

.principles li {
  padding-left: 14px;
  border-left: 2px solid var(--accent);
}

.principles strong {
  display: block;
  font-size: 14px;
}

.principles span {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--muted);
}

.update {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 54px;
  align-items: center;
}

.update-facts {
  display: flex;
  gap: 40px;
  margin: 26px 0 0;
}

.update-facts span {
  display: block;
  font-size: 12px;
  color: var(--muted);
}

.update-facts strong {
  display: block;
  margin-top: 2px;
  font-size: 18px;
}

.update-notes {
  max-width: 34em;
  margin: 16px 0 24px;
  color: var(--ink-secondary);
  white-space: pre-line;
}

.update-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-md);
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 13px;
}

.panel-head strong {
  font-size: 15px;
}

.panel-head p {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.panel-list {
  margin: 20px 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.panel-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--ink-secondary);
}

.panel-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: 700;
}

.panel-url {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--surface-soft);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  overflow-x: auto;
  white-space: nowrap;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  padding: 24px 22px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.55);
}

.step-no {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

.steps h3 {
  margin: 13px 0 6px;
  font-size: 16px;
}

.steps p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-secondary);
}

.site-footer {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 28px 42px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 650;
  color: var(--ink-secondary);
}

.site-footer p {
  margin: 0;
  flex: 1;
}

.site-footer a {
  color: var(--accent);
}

.site-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 980px) {
  .hero,
  .update {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

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

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

  .hero {
    padding-top: 36px;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 18px;
  }

  .site-nav {
    gap: 16px;
  }

  .site-nav a:not(.nav-download) {
    display: none;
  }

  main {
    padding: 0 18px 24px;
  }

  .feature-grid,
  .principles,
  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-meta {
    gap: 22px;
  }

  .site-footer {
    flex-wrap: wrap;
    padding: 22px 18px 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}