/* QuietScreen · 屏息 — 静态站点样式
   深色 Fluent，克制：只用背景层次与 1px 描边，不堆高光、不加载外部资源。 */

:root {
  --bg: #111116;
  --bg-soft: #16161b;
  --surface: #1c1c20;
  --card: #242428;
  --card-2: #2c2c31;
  --line: #323238;
  --line-soft: #29292e;
  --text: #f2f2f5;
  --sub: #9e9ea8;
  --muted: #77777f;
  --accent: #7c89ff;
  --accent-soft: #6a75e0;
  --green: #4cc38a;
  --amber: #ffc24b;
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1080px;
  --font: "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI",
          -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

img { max-width: 100%; display: block; }

.wrap {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

/* ---------- 顶栏 ---------- */
.site-header {
  border-bottom: 1px solid var(--line-soft);
  background: rgba(17, 17, 22, .92);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 68px;
}

.brand { display: flex; align-items: center; gap: 11px; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.brand-name { font-weight: 650; letter-spacing: .2px; font-size: 15px; }
.brand-sub { color: var(--muted); font-size: 12px; margin-left: 4px; }

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 13.5px;
}
.nav a { color: var(--sub); }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav .nav-cta {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 16px;
  color: var(--text);
}
.nav .nav-cta:hover { border-color: var(--accent); text-decoration: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #12121a; }
.btn-primary:hover { background: #8e99ff; }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); }

/* ---------- Hero ---------- */
.hero { padding: 88px 0 72px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--sub);
  font-size: 12.5px;
  letter-spacing: .4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 26px;
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--green);
}

h1 {
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.18;
  letter-spacing: -.8px;
  margin: 0 0 18px;
  font-weight: 680;
}
h1 .accent { color: var(--accent); }

.lede {
  color: var(--sub);
  font-size: 16.5px;
  line-height: 1.85;
  max-width: 520px;
  margin: 0 0 30px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-note { color: var(--muted); font-size: 12.5px; margin-top: 18px; }

/* Hero 右侧：状态示意卡 */
.state-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px;
}
.state-card-head {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12.5px; color: var(--muted);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}
.state-row {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}
.state-row:last-of-type { border-bottom: 0; }
.state-icon {
  width: 38px; height: 38px; flex: 0 0 38px;
  border-radius: var(--radius-sm);
  background: var(--card-2);
  display: grid; place-items: center;
  font-size: 17px; color: var(--sub);
}
.state-icon.on { background: rgba(124, 137, 255, .16); color: var(--accent); }
.state-text strong { display: block; font-size: 14px; font-weight: 600; }
.state-text span { font-size: 12.5px; color: var(--muted); }
.state-tag {
  margin-left: auto;
  font-size: 11.5px;
  color: var(--sub);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 11px;
  white-space: nowrap;
}
.state-tag.on { color: var(--green); border-color: rgba(76, 195, 138, .35); }
.state-foot {
  margin-top: 14px; padding: 12px 14px;
  background: var(--card); border-radius: var(--radius-sm);
  font-size: 12.5px; color: var(--sub);
}
.state-foot code { color: var(--text); font-size: 12px; }

/* ---------- 通用区块 ---------- */
section { padding: 64px 0; }
.section-head { margin-bottom: 34px; }
.section-kicker {
  color: var(--accent); font-size: 12.5px; font-weight: 600;
  letter-spacing: 1.2px; text-transform: uppercase; margin: 0 0 10px;
}
h2 { font-size: clamp(24px, 3vw, 32px); line-height: 1.3; margin: 0 0 10px; letter-spacing: -.4px; }
.section-intro { color: var(--sub); max-width: 620px; margin: 0; }

.divider { height: 1px; background: var(--line-soft); border: 0; margin: 0; }

/* ---------- 特性 ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 24px 22px;
  transition: border-color .18s ease, background-color .18s ease;
}
.feature:hover { border-color: var(--line); background: var(--card); }
.feature .ico {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--card-2); display: grid; place-items: center;
  font-size: 17px; color: var(--accent); margin-bottom: 16px;
}
.feature h3 { font-size: 15.5px; margin: 0 0 8px; font-weight: 650; }
.feature p { color: var(--sub); font-size: 13.5px; margin: 0; line-height: 1.7; }

/* ---------- 工作原理 ---------- */
.modes { display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: stretch; }
.mode {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 26px;
}
.mode.is-night { border-color: rgba(124, 137, 255, .35); }
.mode-label {
  display: inline-block; font-size: 11.5px; letter-spacing: .6px;
  color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 11px; margin-bottom: 16px;
}
.mode.is-night .mode-label { color: var(--accent); border-color: rgba(124, 137, 255, .35); }
.mode h3 { margin: 0 0 10px; font-size: 18px; }
.mode p { color: var(--sub); font-size: 13.5px; margin: 0 0 16px; }
.mode ul { list-style: none; padding: 0; margin: 0; font-size: 13.5px; color: var(--sub); }
.mode li { padding: 5px 0 5px 18px; position: relative; }
.mode li::before {
  content: ""; position: absolute; left: 0; top: 13px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--line);
}
.mode.is-night li::before { background: var(--accent); }
.mode-arrow {
  display: grid; place-items: center; color: var(--muted);
  font-size: 20px; padding: 0 4px;
}
.hotkeys {
  margin-top: 20px; display: flex; flex-wrap: wrap; gap: 12px;
}
kbd {
  font-family: var(--font); font-size: 12.5px;
  background: var(--card); border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 6px;
  padding: 3px 9px; color: var(--text);
}
.hotkeys span { color: var(--sub); font-size: 13px; display: inline-flex; align-items: center; gap: 9px; }

/* ---------- 截图 ---------- */
.shots { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.shot {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); overflow: hidden;
}
.shot img { width: 100%; height: auto; }
.shot-caption {
  padding: 13px 18px; font-size: 13px; color: var(--sub);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 隐私 / 离线 ---------- */
.privacy-band {
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: 20px;
  padding: 36px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: center;
}
.privacy-band h2 { font-size: 25px; }
.privacy-band p { color: var(--sub); margin: 0; max-width: 620px; }
.privacy-points {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px;
}
.privacy-points span {
  font-size: 12.5px; color: var(--sub);
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 13px;
}

/* ---------- 系统要求 ---------- */
.reqs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.req {
  border-left: 2px solid var(--line);
  padding: 4px 0 4px 18px;
}
.req strong { display: block; font-size: 14px; margin-bottom: 5px; }
.req span { color: var(--sub); font-size: 13px; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 34px 0 44px;
  margin-top: 30px;
}
.footer-inner {
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px;
  font-size: 13px; color: var(--muted);
}
.footer-inner a { color: var(--sub); }
.footer-links { margin-left: auto; display: flex; gap: 22px; flex-wrap: wrap; }

/* ---------- 政策正文 ---------- */
.page-head { padding: 64px 0 0; }
.page-head h1 { font-size: clamp(30px, 4vw, 40px); margin-bottom: 12px; }
.page-head .meta { color: var(--muted); font-size: 13px; }
.prose {
  max-width: 760px;
  padding: 28px 0 72px;
}
.prose h2 {
  font-size: 20px; margin: 40px 0 12px;
  padding-top: 26px; border-top: 1px solid var(--line-soft);
}
.prose h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 18px; }
.prose p { color: var(--sub); margin: 0 0 14px; }
.prose ul { color: var(--sub); padding-left: 20px; margin: 0 0 16px; }
.prose li { margin: 6px 0; }
.prose strong { color: var(--text); font-weight: 600; }
.prose code {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 5px; padding: 2px 6px; font-size: 12.5px; color: var(--text);
  word-break: break-all;
}
.callout {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 18px 20px; margin: 22px 0;
}
.callout p { margin: 0; }
.url-box {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 14px; margin: 6px 0 18px;
  font-size: 13px; color: var(--text); word-break: break-all;
}
.prose .en {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 22px 24px; margin-top: 36px;
}
.prose .en h2 { border: 0; padding: 0; margin: 0 0 10px; font-size: 16px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .modes { grid-template-columns: 1fr; }
  .mode-arrow { transform: rotate(90deg); padding: 0; }
  .privacy-band { grid-template-columns: 1fr; }
  .reqs { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .wrap { width: min(100% - 28px, var(--max)); }
  .header-inner { min-height: 60px; flex-wrap: wrap; padding: 10px 0; }
  .nav { gap: 16px; margin-left: 0; width: 100%; overflow-x: auto; }
  .nav .nav-cta { display: none; }
  .brand-sub { display: none; }
  .hero { padding: 56px 0 48px; }
  section { padding: 48px 0; }
  .features, .shots { grid-template-columns: 1fr; }
  .privacy-band { padding: 24px; }
  .footer-links { margin-left: 0; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}