:root {
  --bg: #0f1216;
  --bg-soft: #151a20;
  --panel: #171d24;
  --panel-2: #1d242d;
  --line: rgba(255, 255, 255, 0.1);
  --ink: #f4f7f2;
  --muted: #a9b2ae;
  --green: #6fe0a8;
  --cyan: #6dc7d3;
  --orange: #f0a35d;
  --yellow: #f4cc6b;
  --red: #ff7d72;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(111, 224, 168, 0.07), transparent 18%),
    linear-gradient(135deg, #11161b 0%, #0f1216 52%, #13171d 100%);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

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

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header,
.page,
.site-footer {
  width: min(1240px, calc(100vw - 28px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 18px 0;
  background: linear-gradient(180deg, rgba(15, 18, 22, 0.98), rgba(15, 18, 22, 0.72));
  backdrop-filter: blur(16px);
}

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

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: var(--radius);
  color: #101419;
  background: var(--green);
  font-size: 22px;
  font-weight: 900;
}

.brand-copy strong,
.brand-copy small {
  display: block;
}

.brand-copy small,
.site-nav a {
  color: var(--muted);
  font-size: 13px;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 18px;
}

.site-nav a {
  padding: 10px 0;
}

.header-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font-weight: 800;
}

.button.primary {
  border-color: transparent;
  color: #101419;
  background: var(--green);
}

.page {
  display: grid;
  gap: 20px;
  padding: 14px 0 28px;
}

.hero,
.feature-grid,
.split-section,
.install-section,
.source-section {
  display: grid;
  gap: 18px;
}

.hero {
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  align-items: stretch;
  padding-top: 12px;
}

.hero-copy,
.preview-panel,
.feature-card,
.download-panel,
.notice-card,
.mini-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(23, 29, 36, 0.9);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

.hero-copy h1 {
  margin-bottom: 14px;
  font-size: clamp(34px, 5vw, 66px);
  line-height: 0.98;
  letter-spacing: 0;
}

.lede,
.feature-card p,
.download-panel p,
.text-block p,
.notice-note,
.mini-card li {
  color: var(--muted);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 18px;
}

.hero-points {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 18px;
  color: var(--ink);
  line-height: 1.6;
}

.preview-panel {
  padding: 18px;
}

.preview-shell {
  display: grid;
  gap: 14px;
  height: 100%;
  min-height: 100%;
  padding: 16px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
}

.preview-top,
.preview-row,
.notice-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.preview-top {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.preview-orb {
  display: grid;
  place-items: center;
  width: 92px;
  height: 92px;
  border: 1px solid rgba(111, 224, 168, 0.3);
  border-radius: 50%;
  color: #101419;
  background: var(--green);
  font-size: 34px;
  font-weight: 900;
}

.preview-card {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 18, 22, 0.68);
}

.preview-row strong,
.preview-row span {
  font-size: 14px;
}

.preview-row span {
  color: var(--muted);
}

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

.feature-card {
  padding: 18px;
}

.feature-card h2,
.section-head h2,
.text-block h2,
.mini-card h3,
.download-panel h3 {
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.15;
}

.section-band,
.split-section,
.install-section {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(21, 26, 32, 0.8);
  box-shadow: var(--shadow);
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.download-panel {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.download-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 18px;
  color: var(--ink);
  line-height: 1.65;
}

.split-section {
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.75fr);
  align-items: start;
}

.notice-card {
  display: grid;
  gap: 10px;
  padding: 18px;
}

.notice-line {
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.notice-line:last-of-type {
  border-bottom: 0;
}

.notice-line span {
  color: var(--muted);
}

.notice-line strong {
  font-size: 16px;
}

.tab-switch {
  display: inline-flex;
  gap: 8px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
}

.tab-button {
  min-height: 38px;
  padding: 0 14px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-weight: 800;
}

.tab-button.active {
  color: #101419;
  background: var(--green);
}

.install-panels {
  display: grid;
}

.install-steps {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 18px;
  color: var(--ink);
  line-height: 1.7;
}

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

.mini-card {
  padding: 18px;
}

.mini-card ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 18px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 0 0 22px;
  color: var(--muted);
  font-size: 13px;
}

code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink);
}

@media (max-width: 1060px) {
  .site-header,
  .hero,
  .feature-grid,
  .split-section,
  .source-section {
    grid-template-columns: 1fr;
  }

  .site-header {
    position: static;
  }

  .site-nav {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .site-header {
    width: calc(100vw - 20px);
    gap: 12px;
  }

  .header-actions,
  .site-nav,
  .site-footer,
  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-copy,
  .preview-panel,
  .feature-card,
  .section-band,
  .install-section,
  .mini-card,
  .notice-card,
  .download-panel {
    padding: 16px;
  }

  .hero-copy h1 {
    font-size: 34px;
  }

  .preview-orb {
    width: 78px;
    height: 78px;
    font-size: 30px;
  }

  .button {
    width: 100%;
  }
}