/* ============================================================
   TabLite 开发者网站 — style.css
   Spec: artifacts/site/design/spec.md (tokens/components/layout)
   Apple 亮色固定（D3 方向）；零依赖
   ============================================================ */

/* ---------- 1. Tokens（浅色默认） ---------- */
:root {
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-surface-hover: #f0f0f2;
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-muted: #6e6e73;
  --color-border: rgba(0, 0, 0, .12);
  --color-border-subtle: rgba(0, 0, 0, .06);
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-accent-soft: rgba(0, 113, 227, .1);
  --color-dark-band: #1d1d1f;
  --color-success: #34c759;
  --color-danger: #ff3b30;

  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", ui-monospace, "Cascadia Code", Menlo, monospace;

  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-8: 64px;

  --radius-sm: 8px; --radius-md: 12px; --radius-lg: 18px;

  --shadow-card: 0 1px 2px rgba(0,0,0,.05), 0 8px 30px rgba(0,0,0,.1);
  --shadow-cta: 0 4px 14px rgba(0,113,227,.35);

  --motion-fast: 150ms ease-out;
  --motion-base: 300ms cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 2. Tokens（深色：跟随系统） ---------- */

/* ---------- 3. 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--font-display); line-height: 1.25; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: inline-block; vertical-align: middle; }
::selection { background: var(--color-accent-soft); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 var(--space-4); }
.container-narrow { max-width: 720px; margin: 0 auto; padding: 0 var(--space-4); }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--color-accent); color: #fff;
  padding: 8px 16px; border-radius: 0 0 8px 0; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- 4. Navbar（毛玻璃仅此组件） ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(245, 245, 247, .8);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--color-border-subtle);
}
.nav-inner { display: flex; align-items: center; height: 64px; gap: var(--space-5); }
.brand {
  font-family: var(--font-display); font-weight: 700; font-size: 18px;
  color: var(--color-text-primary); display: flex; align-items: center; gap: 6px;
}
.brand:hover { text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: var(--space-5); margin-left: auto; }
.nav-links a {
  font-size: 14px; color: var(--color-text-secondary); padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--color-text-primary); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--color-text-primary); border-bottom-color: var(--color-accent); }

/* 语言切换 */
.langswitch { display: inline-flex; border: 1px solid var(--color-border); border-radius: 999px; overflow: hidden; }
.langswitch button {
  font-family: var(--font-body); font-size: 13px; color: var(--color-text-secondary);
  background: transparent; border: none; padding: 5px 14px; cursor: pointer;
}
.langswitch button[aria-pressed="true"] { background: var(--color-accent-soft); color: var(--color-accent); font-weight: 600; }
.langswitch button:hover { background: var(--color-surface-hover); }

.hamburger {
  display: none; margin-left: auto;
  background: transparent; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: 6px 12px; font-size: 18px; cursor: pointer; color: var(--color-text-primary);
}

@media (max-width: 767px) {
  .hamburger { display: block; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--color-surface); border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-card); padding: var(--space-2) var(--space-4) var(--space-4);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 4px; border-bottom: 1px solid var(--color-border-subtle); }
  .nav-links .langswitch { align-self: flex-start; margin-top: 12px; }
}

/* ---------- 5. Button ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-family: var(--font-body); font-size: 17px; font-weight: 600;
  padding: 0 30px; height: 52px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
  transition: background var(--motion-fast), transform var(--motion-fast), box-shadow var(--motion-fast);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--color-accent); color: #fff; box-shadow: var(--shadow-cta); }
.btn-primary:hover { background: var(--color-accent-hover); }
.btn-ghost { background: transparent; color: var(--color-accent); border-color: var(--color-accent); }
.btn-ghost:hover { background: var(--color-accent-soft); }
.btn-block { width: 100%; }

/* ---------- 6. Hero（Apple 居中范式） ---------- */
.hero {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: 96px 0 64px;
  text-align: center;
}
.hero-grid { display: grid; grid-template-columns: 1fr; justify-items: center; gap: var(--space-8); max-width: 900px; margin: 0 auto; }
.hero .badge {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--color-accent);
  background: var(--color-accent-soft); border-radius: 999px; padding: 4px 14px; margin-bottom: var(--space-5);
}
.hero h1 {
  font-size: clamp(38px, 6vw, 60px); font-weight: 700; letter-spacing: -.02em; line-height: 1.08;
  margin: 0 auto var(--space-4); max-width: 820px;
  background: linear-gradient(120deg, #0071e3, #8a2be2 60%, #f54e9a);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent;
}
.hero .sub { font-size: clamp(17px, 2vw, 21px); color: var(--color-text-secondary); max-width: 640px; margin: 0 auto var(--space-6); }
.hero .cta-row { display: flex; gap: var(--space-3); flex-wrap: wrap; justify-content: center; align-items: center; }
.cta-note { font-size: 13px; color: var(--color-text-muted); }
.hero .stats {
  display: flex; gap: var(--space-8); flex-wrap: wrap; justify-content: center; margin-top: var(--space-6);
  padding-top: var(--space-5); border-top: 1px solid var(--color-border-subtle);
}
.hero .stats .stat { font-family: var(--font-mono); font-size: 15px; color: var(--color-text-primary); font-variant-numeric: tabular-nums; }
.hero .stats .stat span { color: var(--color-text-muted); font-size: 13px; font-family: var(--font-body); }

/* PopupMock（CSS+SVG 产品示意） */
.popupmock {
  background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border); overflow: hidden; max-width: 380px; margin: 0 auto;
}
.pm-bar {
  display: flex; align-items: center; gap: 6px; padding: 10px 14px;
  border-bottom: 1px solid var(--color-border-subtle);
}
.pm-dot { width: 10px; height: 10px; border-radius: 50%; }
.pm-dot.r { background: #ff5f57; } .pm-dot.y { background: #febc2e; } .pm-dot.g { background: #28c840; }
.pm-title { font-size: 12px; color: var(--color-text-muted); margin-left: 6px; font-family: var(--font-mono); }
.pm-body { padding: 16px; }
.pm-ring-row { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.pm-ring-label { font-size: 13px; color: var(--color-text-secondary); line-height: 1.4; }
.pm-row {
  display: flex; align-items: center; gap: 8px; padding: 9px 10px;
  border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); margin-bottom: 8px;
  background: var(--color-bg);
}
.pm-fav { width: 16px; height: 16px; border-radius: 4px; background: var(--color-accent-soft); display: inline-flex; align-items: center; justify-content: center; font-size: 10px; }
.pm-fav.green { background: rgba(52, 199, 89, .15); } .pm-fav.red { background: rgba(255, 59, 48, .12); }
.pm-row .t { flex: 1; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pm-score { font-family: var(--font-mono); font-size: 12px; padding: 2px 8px; border-radius: 999px; font-variant-numeric: tabular-nums; }
.pm-score.hi { background: rgba(52, 199, 89, .15); color: var(--color-success); }
.pm-score.mid { background: rgba(255, 159, 10, .15); color: #ff9f0a; }
.pm-score.lo { background: rgba(255, 59, 48, .12); color: var(--color-danger); }
.pm-btn {
  display: block; width: 100%; text-align: center; background: var(--color-accent); color: #fff;
  border: none; border-radius: var(--radius-sm); padding: 9px 0; font-size: 13px; font-weight: 600; cursor: default;
}
.pm-note { text-align: center; font-size: 12px; color: var(--color-text-muted); padding: 8px 0 0; }

/* ---------- 7. Section 通用 ---------- */
.section { padding: var(--space-8) 0; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto var(--space-6); }
.section-head h2 { font-size: 25px; font-weight: 700; letter-spacing: -.01em; margin-bottom: var(--space-2); }
.section-head p { color: var(--color-text-secondary); font-size: 15px; }

/* 特性 3 列 */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.card {
  background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-card);
  padding: var(--space-5); border: 1px solid var(--color-border-subtle);
}
.card .ico { font-size: 26px; margin-bottom: var(--space-3); }
.card h3 { font-size: 17px; font-weight: 600; margin-bottom: var(--space-2); }
.card p { font-size: 14.5px; color: var(--color-text-secondary); }

/* 安装 3 步 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); counter-reset: step; }
.step { position: relative; padding-top: var(--space-6); }
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  position: absolute; top: 0; left: 0; font-family: var(--font-mono); font-size: 14px;
  color: var(--color-accent); font-weight: 600;
}
.step h3 { font-size: 16px; font-weight: 600; margin-bottom: var(--space-2); }
.step p { font-size: 14.5px; color: var(--color-text-secondary); }

/* 隐私承诺带 */
.promise {
  background: var(--color-dark-band); color: #fff; border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6); text-align: center; margin: var(--space-8) 0;
}
.promise h2 { font-size: 25px; font-weight: 700; margin-bottom: var(--space-4); }
.promise .promise-items { display: flex; justify-content: center; gap: var(--space-6); flex-wrap: wrap; margin-bottom: var(--space-6); }
.promise .promise-items li {
  list-style: none; display: flex; align-items: center; gap: 8px; font-size: 15px; color: rgba(255,255,255,.85);
}
.promise .promise-items svg { color: var(--color-success); flex-shrink: 0; }
.promise .promise-link { color: #fff; text-decoration: underline; text-underline-offset: 3px; font-size: 15px; }
.promise .promise-link:hover { color: var(--color-accent-hover); }

/* FAQ */
.faq-wrap { max-width: 720px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--color-border-subtle); }
.faq-item:first-child { border-top: 1px solid var(--color-border-subtle); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  background: transparent; border: none; cursor: pointer; text-align: left;
  font-family: var(--font-body); font-size: 16px; font-weight: 500; color: var(--color-text-primary);
  padding: 18px 4px;
}
.faq-q:hover { color: var(--color-accent); }
.faq-q .chev { flex-shrink: 0; color: var(--color-text-muted); transition: transform var(--motion-base); }
.faq-item[data-open="true"] .chev { transform: rotate(180deg); }
.faq-a {
  display: grid; grid-template-rows: 0fr; transition: grid-template-rows var(--motion-base);
  font-size: 15px; color: var(--color-text-secondary);
}
.faq-item[data-open="true"] .faq-a { grid-template-rows: 1fr; }
.faq-a-inner { overflow: hidden; }
.faq-a-inner p { padding: 0 4px 18px; }

/* ---------- 8. 正文页（隐私/支持/日志） ---------- */
.page-head { padding: var(--space-8) 0 var(--space-6); border-bottom: 1px solid var(--color-border-subtle); margin-bottom: var(--space-8); }
.page-head h1 { font-size: 31px; font-weight: 700; letter-spacing: -.02em; margin-bottom: var(--space-2); }
.page-head .updated { font-family: var(--font-mono); font-size: 13px; color: var(--color-text-muted); }
.page-body { padding-bottom: var(--space-8); }
.page-body h2 { font-size: 20px; font-weight: 700; margin: var(--space-8) 0 var(--space-4); }
.page-body h3 { font-size: 16px; font-weight: 600; margin: var(--space-5) 0 var(--space-3); }
.page-body p { margin-bottom: var(--space-4); color: var(--color-text-secondary); font-size: 15px; }

/* 声明卡 */
.declare { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); margin-bottom: var(--space-6); }
.declare .item { background: var(--color-surface); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); padding: var(--space-4); text-align: center; }
.declare .item b { display: block; font-size: 16px; margin-bottom: 2px; }
.declare .item span { font-size: 13px; color: var(--color-text-muted); }

/* 表格 */
.tbl-wrap { overflow-x: auto; margin: var(--space-4) 0 var(--space-6); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); }
table.tbl { width: 100%; border-collapse: collapse; min-width: 480px; font-size: 14.5px; }
.tbl th, .tbl td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--color-border-subtle); }
.tbl th { font-family: var(--font-display); font-size: 13px; font-weight: 600; color: var(--color-text-secondary); background: var(--color-surface-hover); }
.tbl td:first-child { white-space: nowrap; font-family: var(--font-mono); font-size: 13px; }
.tbl tr:last-child td { border-bottom: none; }

/* 不做什么 */
.nolist { list-style: none; }
.nolist li { display: flex; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--color-border-subtle); font-size: 15px; }
.nolist li:last-child { border-bottom: none; }
.nolist .x { color: var(--color-danger); flex-shrink: 0; }

/* 排障卡 */
.trouble-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); margin-bottom: var(--space-6); }
.trouble-grid .card h3 { display: flex; gap: 8px; align-items: center; }

/* 联系卡 */
.contact-card {
  background: var(--color-dark-band); color: #fff; border-radius: var(--radius-lg);
  padding: var(--space-6); margin-top: var(--space-6);
}
.contact-card h2 { color: #fff; margin-top: 0; }
.contact-card p { color: rgba(255,255,255,.8); }
.contact-card .btn-primary { margin-top: var(--space-4); }

/* 时间线 */
.timeline { position: relative; padding-left: var(--space-6); }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--color-border); }
.tl-item { position: relative; margin-bottom: var(--space-6); }
.tl-item::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-6) + 3px); top: 8px;
  width: 10px; height: 10px; border-radius: 50%; background: var(--color-accent);
}
.tl-item h3 { font-size: 17px; font-weight: 700; }
.tl-item .ver { font-family: var(--font-mono); font-size: 13px; color: var(--color-accent); margin-bottom: var(--space-2); }
.tl-item ul { list-style: none; }
.tl-item li { padding: 5px 0; font-size: 15px; color: var(--color-text-secondary); }
.tl-item li::before { content: "—"; color: var(--color-border); margin-right: 8px; }

/* ---------- 9. Footer ---------- */
.footer { background: var(--color-bg); border-top: 1px solid var(--color-border-subtle); padding: var(--space-8) 0 var(--space-6); margin-top: var(--space-8); }
.footer-grid { display: flex; justify-content: space-between; gap: var(--space-6); flex-wrap: wrap; }
.footer .brand { margin-bottom: var(--space-2); }
.footer p.tag { font-size: 13px; color: var(--color-text-muted); max-width: 40ch; }
.footer-links { display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.footer-links a { color: var(--color-text-secondary); }
.footer-links a:hover { color: var(--color-text-primary); }
.footer-bottom {
  margin-top: var(--space-6); padding-top: var(--space-4); border-top: 1px solid var(--color-border-subtle);
  display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap;
  font-size: 13px; color: var(--color-text-muted);
}

/* ---------- 10. 断点 ---------- */
@media (max-width: 900px) {
  .hero { padding: 72px 0 48px; }
  .popupmock { max-width: 420px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .trouble-grid { grid-template-columns: repeat(2, 1fr); }
  .declare { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 599px) {
  .features-grid, .steps, .trouble-grid { grid-template-columns: 1fr; }
  .declare { grid-template-columns: 1fr; }
  .step { padding-top: var(--space-5); }
  .hero .cta-row .btn { width: 100%; }
  .promise { padding: var(--space-6) var(--space-4); }
  .promise .promise-items { flex-direction: column; align-items: center; gap: var(--space-3); }
  .page-head h1 { font-size: 25px; }
  .section-head h2 { font-size: 21px; }
  .hero h1 { font-size: 34px; }
}

/* ---------- 11. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}