:root {
  --bg: #0a0a0a;
  --bg-2: #111111;
  --surface: #141414;
  --ink: #f5f5f5;
  --muted: #9a9a9a;
  --line: #2a2a2a;
  --white: #ffffff;
  --red: #e11d48;
  --red-2: #fb7185;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  --radius: 10px;
  --radius-sm: 8px;
  --max: 1120px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(225, 29, 72, 0.08) 0 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(rgba(255,255,255,0.03) 0 1px, transparent 1px) 0 0 / 48px 48px,
    var(--bg);
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; }

.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(10, 10, 10, 0.9);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: #fff;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 800;
  background: var(--red);
  box-shadow: 0 0 0 2px #fff inset, 0 8px 20px rgba(225, 29, 72, 0.35);
}

.logo-text span { color: var(--red); }

.nav-links {
  display: flex;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.93rem;
  font-family: var(--mono);
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: #1a1a1a;
  border: 1px solid var(--line);
  box-shadow: inset 3px 0 0 var(--red);
}

.lang-switch {
  display: inline-flex;
  padding: 0.18rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #111;
}

.lang-switch button {
  border: 0;
  background: transparent;
  padding: 0.32rem 0.65rem;
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.82rem;
}

.lang-switch button.active {
  color: #fff;
  background: var(--red);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 46px;
  padding: 0.7rem 1.15rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 750;
  font-family: var(--mono);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}

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

.btn-primary {
  color: #fff;
  background: var(--red);
  box-shadow: 0 10px 24px rgba(225, 29, 72, 0.32);
}

.btn-secondary {
  color: #fff;
  background: transparent;
  border-color: #3a3a3a;
}

.btn-secondary:hover {
  border-color: var(--red);
  color: var(--red-2);
}

.hero {
  padding: 3.2rem 0 2.2rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.5rem;
  align-items: center;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  padding: 0.24rem 0.65rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--mono);
  color: #fff;
  background: #1a1a1a;
  border: 1px solid #333;
}

.tag:nth-child(4) {
  color: #fff;
  background: var(--red);
  border-color: var(--red);
}

.hero h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(2rem, 4vw, 3.15rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.hero h1 em {
  font-style: normal;
  color: var(--red);
  border-bottom: 4px solid #fff;
}

.hero-lead {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 54ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.4rem;
}

.trust-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.trust-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.95rem;
  box-shadow: var(--shadow);
}

.trust-item strong {
  display: block;
  font-size: 1.05rem;
  font-family: var(--mono);
}

.trust-item span {
  color: var(--muted);
  font-size: 0.86rem;
}

.geek-panel {
  position: relative;
  min-height: 440px;
  border-radius: 12px;
  padding: 1.1rem;
  overflow: hidden;
  background: #0f0f0f;
  border: 1px solid #2f2f2f;
  box-shadow: var(--shadow);
}

.geek-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(transparent 95%, rgba(225, 29, 72, 0.15) 100%),
    repeating-linear-gradient(
      0deg,
      transparent 0 2px,
      rgba(255,255,255,0.015) 2px 3px
    );
  pointer-events: none;
}

.terminal-bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}

.terminal-bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #333;
  display: block;
}

.terminal-bar i:nth-child(1) { background: var(--red); }
.terminal-bar i:nth-child(2) { background: #fff; }
.terminal-bar i:nth-child(3) { background: #555; }

.terminal-bar span {
  margin-left: 0.4rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.geek-code {
  position: relative;
  z-index: 1;
  margin: 0 0 1rem;
  padding: 0.9rem;
  border-radius: 8px;
  background: #080808;
  border: 1px solid #262626;
  color: #d4d4d4;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.geek-code .cmd { color: var(--red-2); }
.geek-code .ok { color: #fff; }

.geek-panel img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 190px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid #333;
  filter: grayscale(0.35) contrast(1.05);
}

.geek-label {
  position: relative;
  z-index: 1;
  margin-top: 0.85rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.geek-label b { color: var(--red); font-weight: 700; }

.section { padding: 3.1rem 0; }

.section-head { margin-bottom: 1.35rem; }

.section-kicker {
  display: inline-block;
  margin-bottom: 0.45rem;
  color: var(--red);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--mono);
}

.section-head h2 {
  margin: 0 0 0.45rem;
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.platform-card,
.feature-card,
.recommend-card,
.scene-card,
.faq-item,
.step-card,
.compat-item,
.download-card,
.docs-panel,
.flow-panel,
.preview-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.platform-card:hover,
.feature-card:hover,
.recommend-card:hover {
  border-color: #444;
  box-shadow: inset 0 0 0 1px rgba(225, 29, 72, 0.25), var(--shadow);
}

.platform-grid,
.feature-grid,
.recommend-grid,
.scene-grid,
.faq-grid,
.compat-grid {
  display: grid;
  gap: 1rem;
}

.platform-grid,
.feature-grid,
.recommend-grid,
.scene-grid,
.compat-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.platform-card,
.feature-card,
.recommend-card,
.scene-card,
.faq-item,
.step-card,
.compat-item,
.docs-panel { padding: 1.1rem 1.15rem; }

.os-badge,
.badge,
.status,
.step-label,
.feature-index,
.compat-dot {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.74rem;
  font-weight: 800;
  font-family: var(--mono);
}

.os-badge,
.badge,
.step-label,
.feature-index {
  color: #fff;
  background: #1f1f1f;
  border: 1px solid #333;
}

.status {
  color: #fff;
  background: var(--red);
}

.compat-dot {
  color: #111;
  background: #fff;
  margin-bottom: 0.7rem;
}

.platform-card h3,
.feature-card h3,
.recommend-card h3,
.scene-card h3,
.faq-item h3,
.step-card h3,
.compat-item h3,
.docs-panel h3,
.download-card h3 {
  margin: 0.7rem 0 0.45rem;
  font-size: 1.06rem;
}

.meta-list {
  display: grid;
  gap: 0.35rem;
  margin: 0.7rem 0 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.meta-list li {
  padding-left: 0.9rem;
  position: relative;
}

.meta-list li::before {
  content: ">";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--red);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.feature-card p,
.scene-card p,
.faq-item p,
.step-card p,
.compat-item p,
.docs-panel p,
.download-card p {
  margin: 0;
  color: var(--muted);
}

.inline-img {
  margin-top: 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  filter: grayscale(0.2) contrast(1.05);
}

.how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.flow-panel,
.preview-panel { padding: 1.15rem; }

.flow-list { display: grid; gap: 0.9rem; }

.flow-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.8rem;
  align-items: start;
}

.flow-num {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-family: var(--mono);
  background: var(--red);
}

.flow-list h3 {
  margin: 0 0 0.2rem;
  font-size: 1rem;
}

.flow-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.preview-panel img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 0.9rem;
  border: 1px solid var(--line);
  filter: grayscale(0.25);
}

.code-box {
  margin: 0;
  padding: 1rem;
  border-radius: 8px;
  background: #080808;
  color: #e5e5e5;
  font-size: 0.84rem;
  overflow: auto;
  line-height: 1.5;
  font-family: var(--mono);
  border: 1px solid #262626;
}

.ability-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.ability-row span {
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  background: #111;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
  font-family: var(--mono);
}

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

.hint-box {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  background: rgba(225, 29, 72, 0.08);
  border: 1px solid rgba(225, 29, 72, 0.35);
  color: #fecdd3;
}

.hint-box strong { display: block; margin-bottom: 0.35rem; color: #fff; }
.hint-box p { margin: 0; }

.page-hero { padding: 2.5rem 0 1rem; }

.page-hero h1 {
  margin: 0.35rem 0 0.7rem;
  font-size: clamp(1.8rem, 3vw, 2.45rem);
  letter-spacing: -0.02em;
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
}

.download-list { display: grid; gap: 1rem; }

.download-card {
  display: grid;
  grid-template-columns: 1.3fr 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.15rem;
}

.cta-band {
  margin: 1rem 0 3rem;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  color: #fff;
  background:
    linear-gradient(90deg, var(--red), #9f1239 55%, #111 55%, #111);
  border: 1px solid #333;
  box-shadow: var(--shadow);
}

.cta-band h2 {
  margin: 0 0 0.45rem;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.cta-band p {
  margin: 0 0 1.1rem;
  color: #e5e5e5;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  justify-content: center;
}

.cta-band .btn-primary {
  background: #fff;
  color: #111;
  box-shadow: none;
}

.cta-band .btn-secondary {
  color: #fff;
  border-color: rgba(255,255,255,0.35);
}

.site-footer {
  padding: 2.4rem 0 1.4rem;
  background: #050505;
  border-top: 1px solid var(--line);
  color: #9a9a9a;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 1.2rem;
}

.site-footer h3,
.site-footer h4 {
  margin: 0 0 0.7rem;
  color: #fff;
}

.site-footer p {
  margin: 0;
  font-size: 0.92rem;
}

.site-footer ul { display: grid; gap: 0.4rem; }
.site-footer a:hover { color: var(--red-2); }

.footer-bottom {
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid #222;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
  font-family: var(--mono);
}

.tutorial-layout { display: grid; gap: 1rem; }

@media (max-width: 980px) {
  .hero-grid,
  .how-grid,
  .download-card { grid-template-columns: 1fr; }
  .platform-grid,
  .feature-grid,
  .recommend-grid,
  .scene-grid,
  .compat-grid,
  .steps,
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .cta-band { background: linear-gradient(180deg, var(--red), #111); }
}

@media (max-width: 640px) {
  .trust-row,
  .platform-grid,
  .feature-grid,
  .recommend-grid,
  .scene-grid,
  .compat-grid,
  .faq-grid,
  .steps,
  .footer-grid { grid-template-columns: 1fr; }
  .geek-panel { min-height: auto; }
}