body.site {
  background:
    radial-gradient(1400px 700px at 88% -12%, rgba(232, 93, 47, 0.12), transparent 60%),
    radial-gradient(900px 550px at -8% 110%, rgba(78, 182, 166, 0.08), transparent 60%),
    #ffffff;
  min-height: 100vh;
}

/* ===== 顶部导航 ===== */
.topnav {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 20px 48px;
  gap: 40px;
  border-bottom: 2px solid var(--ink);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, #ffffff 92%, transparent);
  backdrop-filter: blur(8px);
  z-index: 20;
}

.topnav .brand {
  font-family: var(--serif);
  font-weight: 900;
  font-style: italic;
  font-size: 26px;
  letter-spacing: -0.04em;
  color: var(--ink);
}
.topnav .brand span { color: var(--oxide); }

.topnav .nav-links {
  display: flex;
  gap: 28px;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.topnav .nav-links a {
  color: var(--ink-soft);
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.topnav .nav-links a:hover {
  color: var(--ink);
  border-bottom-color: var(--oxide);
}

.topnav .nav-cta {
  display: flex;
  gap: 10px;
}

.btn-ghost, .btn-fill {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 10px 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.15s, background 0.15s, color 0.15s;
}
.btn-ghost {
  border: 1px solid var(--ink);
  color: var(--ink);
  background: #ffffff;
}
.btn-ghost:hover {
  background: var(--ink);
  color: #ffffff;
}
.btn-fill {
  background: var(--oxide);
  color: var(--ink);
  border: 1px solid var(--oxide);
}
.btn-fill:hover {
  background: var(--sulfur);
  border-color: var(--sulfur);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--ink);
}
.btn-fill.big, .btn-ghost.big {
  padding: 14px 22px;
  font-size: 12px;
}

/* ===== Hero ===== */
.hero {
  padding: 72px 48px 60px;
  position: relative;
}
.hero .issue {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 30px;
}
.hero-main {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 64px;
  align-items: end;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(64px, 9vw, 132px);
  line-height: 0.9;
  letter-spacing: -0.045em;
  font-weight: 900;
}
.hero h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--oxide);
}
.hero h1 .strike {
  position: relative;
  display: inline-block;
}
.hero h1 .strike::after {
  content: '';
  position: absolute;
  left: -6px;
  right: -6px;
  top: 55%;
  height: 6px;
  background: var(--ink);
  transform: rotate(-4deg);
}
.hero-side .lede {
  font-family: var(--body);
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink-soft);
  padding-left: 18px;
  border-left: 3px solid var(--ink);
  max-width: 44ch;
}
.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.hero-meta {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding-top: 20px;
  border-top: 1px dashed var(--rule);
  max-width: 460px;
}
.hero-meta > div { display: flex; flex-direction: column; gap: 4px; }
.hero-meta .k {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.hero-meta .v {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.hero-meta .v.pulse {
  color: var(--patina);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.hero-meta .v.pulse::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--patina);
  border-radius: 50%;
  animation: heartbeat 1.4s ease-in-out infinite;
}
@keyframes heartbeat {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.75); }
}

/* ===== 通用小节头 ===== */
.section-head {
  padding: 60px 48px 20px;
  border-top: 2px solid var(--ink);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: end;
}
.section-head .meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding-bottom: 12px;
}
.section-head h2 {
  font-family: var(--serif);
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.03em;
  line-height: 1;
}

/* ===== 特性 ===== */
.features { padding-bottom: 40px; }
.feat-grid {
  padding: 20px 48px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.feat {
  padding: 26px;
  background: #ffffff;
  border: 1px solid var(--ink);
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  min-height: 180px;
}
.feat::before {
  content: attr(data-idx);
  position: absolute;
  top: 12px;
  right: 16px;
  font-family: var(--serif);
  font-size: 56px;
  font-weight: 900;
  font-style: italic;
  color: var(--ink);
  opacity: 0.08;
  line-height: 1;
}
.feat:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 var(--ink);
  background: #f6f5f2;
}
.feat h3 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  max-width: 78%;
}
.feat p {
  font-family: var(--body);
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.65;
}

/* ===== 工作台预览 mock（浅底蓝图版）===== */
.preview { padding-bottom: 40px; }
.mock {
  margin: 20px 48px 40px;
  background: #ffffff;
  border: 2px solid var(--ink);
  color: var(--ink);
  box-shadow: 16px 16px 0 var(--ink);
  overflow: hidden;
}
.mock-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  background: #f6f5f2;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.14em;
}
.mock-topbar .dot { width: 10px; height: 10px; background: var(--ink); border-radius: 50%; opacity: 0.2; }
.mock-topbar .dot:nth-child(1) { background: var(--oxide); opacity: 0.9; }
.mock-topbar .dot:nth-child(2) { background: var(--sulfur); opacity: 0.9; }
.mock-topbar .dot:nth-child(3) { background: var(--patina); opacity: 0.9; }
.mock-topbar .mock-title { flex: 1; color: var(--ink); }
.mock-topbar .mock-title em { color: var(--oxide); font-style: normal; }
.mock-topbar .mock-btn {
  padding: 4px 10px;
  background: var(--oxide);
  color: var(--ink);
  font-size: 10px;
  letter-spacing: 0.2em;
}
.mock-body {
  display: grid;
  grid-template-columns: 200px 1fr 220px;
  min-height: 380px;
}
.mock-drawer, .mock-inspector {
  background: #f6f5f2;
  padding: 18px 14px;
  border-right: 1px solid var(--rule);
}
.mock-inspector {
  border-right: none;
  border-left: 1px solid var(--rule);
}
.drawer-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 12px;
}
.tile {
  padding: 10px 12px;
  border: 1px solid var(--rule);
  background: #ffffff;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: 0.1em;
}
.mock-canvas {
  padding: 24px;
  background: #ffffff;
  background-image:
    linear-gradient(rgba(20, 18, 16, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 18, 16, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
}
.paper {
  background: #ffffff;
  color: var(--ink);
  padding: 28px;
  min-height: 100%;
  border: 1px solid var(--rule);
  box-shadow: 0 20px 40px -20px rgba(20, 18, 16, 0.12);
}
.paper-h1 {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 10px;
  animation: mock-rise 1.6s ease-in-out infinite alternate;
}
.paper-p {
  font-family: var(--body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 18px;
}
.paper-btn {
  display: inline-block;
  padding: 12px 22px;
  background: var(--oxide);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}
@keyframes mock-rise {
  from { transform: translateY(4px); }
  to { transform: translateY(-2px); }
}
.prop-title {
  font-family: var(--serif);
  font-size: 20px;
  font-style: italic;
  font-weight: 900;
  color: var(--ink);
  margin-bottom: 10px;
}
.prop-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px dashed var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
}
.prop-row span:last-child { color: var(--oxide); }

/* ===== 组件目录 ===== */
.blocks { padding-bottom: 40px; }
.block-grid {
  padding: 20px 48px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.block-item {
  border: 1px solid var(--ink);
  padding: 22px 20px 18px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background 0.15s, transform 0.15s, color 0.15s, box-shadow 0.2s;
  position: relative;
}
.block-item::before {
  content: '';
  position: absolute;
  inset: 6px 6px auto auto;
  width: 22px; height: 1px;
  background: var(--rule);
}
.block-item:hover {
  background: var(--ink);
  color: #ffffff;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--oxide);
}
.block-item:hover::before { background: var(--oxide); }
.block-item .glyph {
  color: var(--oxide);
  line-height: 0;
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  height: 52px;
  transition: color 0.15s, transform 0.35s cubic-bezier(.2,.7,.2,1);
}
.block-item .glyph svg {
  width: 48px;
  height: 48px;
  display: block;
  overflow: visible;
}
.block-item:hover .glyph {
  color: var(--oxide);
  transform: translateX(4px);
}
.block-item span:last-child {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* ===== 技术栈 ===== */
.tech { padding-bottom: 40px; }
.tech-grid {
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  border: 1px solid var(--ink);
  margin: 20px 48px 20px;
  background: #ffffff;
}
.tech-cell {
  padding: 26px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: #ffffff;
}
.tech-cell:last-child { border-right: none; }
.tech-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--oxide);
  margin-bottom: 12px;
}
.tech-title {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.tech-desc {
  font-family: var(--body);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ===== CTA（白底）===== */
.cta {
  background: #ffffff;
  color: var(--ink);
  margin: 40px 48px 20px;
  padding: 56px;
  position: relative;
  border: 2px solid var(--ink);
  box-shadow: 12px 12px 0 var(--oxide);
}
.cta-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
}
.cta-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--oxide);
  margin-bottom: 10px;
}
.cta h2 {
  font-family: var(--serif);
  font-size: clamp(40px, 6vw, 76px);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.03em;
  line-height: 1;
}
.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== 页脚 ===== */
.footer {
  padding: 40px 48px 32px;
  border-top: 2px solid var(--ink);
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
  background: #ffffff;
}
.foot-mark {
  font-family: var(--serif);
  font-weight: 900;
  font-style: italic;
  font-size: 42px;
  letter-spacing: -0.04em;
  line-height: 1;
}
.foot-mark span { color: var(--oxide); }
.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.foot-cols h5 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 12px;
  font-weight: 700;
}
.foot-cols a, .foot-cols span {
  display: block;
  font-family: var(--body);
  font-size: 14px;
  color: var(--ink-soft);
  padding: 4px 0;
  transition: color 0.15s;
}
.foot-cols a:hover { color: var(--oxide); }
.foot-line {
  grid-column: 1 / -1;
  padding-top: 24px;
  border-top: 1px dashed var(--rule);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ===== 动画入场 ===== */
@keyframes rise-in {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: none; }
}
.rise > * {
  opacity: 0;
  animation: rise-in 0.8s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
.rise > *:nth-child(1) { animation-delay: 0.05s; }
.rise > *:nth-child(2) { animation-delay: 0.18s; }
.rise > *:nth-child(3) { animation-delay: 0.32s; }

/* ===== 响应式 · 平板 ≤ 960px ===== */
@media (max-width: 960px) {
  .topnav { padding: 16px 24px; gap: 20px; }
  .topnav .nav-links { display: none; }
  .hero, .section-head, .feat-grid, .block-grid, .tech-grid, .mock, .cta {
    padding-left: 24px;
    padding-right: 24px;
    margin-left: 0;
    margin-right: 0;
  }
  .hero-main { grid-template-columns: 1fr; gap: 24px; }
  .section-head { grid-template-columns: 1fr; gap: 8px; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-drawer, .mock-inspector { border: none; border-bottom: 1px solid var(--rule); }
  .cta-inner { grid-template-columns: 1fr; }
  .footer { grid-template-columns: 1fr; padding: 32px 24px; }
  .foot-cols { grid-template-columns: 1fr 1fr; }
}

/* ===== 响应式 · 手机 ≤ 640px ===== */
@media (max-width: 640px) {
  .topnav {
    grid-template-columns: 1fr auto;
    padding: 14px 18px;
    gap: 14px;
  }
  .topnav .brand { font-size: 20px; }
  .topnav .kicker { display: none; }
  .topnav .nav-cta a { padding: 8px 12px; font-size: 10px; letter-spacing: 0.14em; }
  .topnav .nav-cta a + a { margin-left: 6px; }

  .hero { padding: 40px 18px 32px; }
  .hero h1 { font-size: clamp(40px, 12vw, 72px); }
  .hero .lede { font-size: 15px; line-height: 1.7; }
  .hero-meta { font-size: 11px; gap: 8px; }
  .hero-meta > div { padding: 8px 10px; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 10px; }
  .hero-actions .btn-fill,
  .hero-actions .btn-ghost { width: 100%; text-align: center; }

  .section-head { padding: 40px 18px 20px; }
  .section-head .num { font-size: 42px; }
  .section-head h2 { font-size: clamp(28px, 8vw, 44px); }

  .feat-grid, .block-grid, .tech-grid {
    padding: 8px 18px 40px;
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .feat-card { padding: 20px 18px; }
  .block-item { padding: 18px 16px 14px; }
  .block-item .glyph svg { width: 40px; height: 40px; }
  .tech-cell { padding: 20px 18px; }
  .tech-cell .tech-title { font-size: 20px; }

  .mock { padding: 8px 18px 40px; }
  .mock-drawer, .mock-inspector { padding: 16px 16px; }
  .mock-canvas { min-height: 240px; padding: 20px; }
  .mock-canvas .canvas-title { font-size: 36px; }

  .cta { padding: 40px 18px; }
  .cta-inner { padding: 28px 22px; }
  .cta h2 { font-size: clamp(32px, 9vw, 56px); }
  .cta .cta-actions { flex-direction: column; align-items: stretch; gap: 10px; }
  .cta .cta-actions a { width: 100%; text-align: center; }

  .footer { padding: 28px 18px; }
  .foot-cols {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .foot-cols > div h5 { font-size: 11px; }
  .footer-sign { flex-direction: column; align-items: flex-start; gap: 8px; text-align: left; }
}

/* ===== 响应式 · 极小屏 ≤ 380px ===== */
@media (max-width: 380px) {
  .topnav { padding: 12px 14px; }
  .topnav .brand { font-size: 18px; }
  .hero { padding: 32px 14px 24px; }
  .hero h1 { font-size: clamp(36px, 14vw, 60px); }
  .section-head, .feat-grid, .block-grid, .tech-grid, .mock, .cta, .footer {
    padding-left: 14px;
    padding-right: 14px;
  }
}

/* ===== 响应式 · 减少动效（尊重系统偏好） ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}