/* ============================================================================
   灯塔导航 Beacon · 企业级导航门户
   Refined stylesheet — restraint over decoration.
   Design principles: consistent tokens · generous whitespace · clear hierarchy
   · subtle motion · accent used sparingly.
   ========================================================================== */

/* ----- 1. Design tokens ----- */
:root {
  --brand-1: #5b8cff;
  --brand-2: #8b7bfb;
  --brand-3: #38c6e0;
  --brand-grad: linear-gradient(120deg, var(--brand-1), var(--brand-2) 60%, var(--brand-3));

  /* dark (default) */
  --bg: #0a0e1a;
  --bg-2: #0e1424;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-2: rgba(255, 255, 255, 0.16);
  --text: #e8edf9;
  --text-soft: #9aa6c0;
  --text-dim: #626e89;
  --shadow: 0 8px 24px -14px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 24px 50px -24px rgba(0, 0, 0, 0.75);
  --ring: rgba(91, 140, 255, 0.4);
  --glow-1: rgba(91, 140, 255, 0.20);
  --glow-2: rgba(139, 123, 251, 0.18);
  --glow-3: rgba(34, 211, 238, 0.12);

  /* Liquid Glass material (iOS 26 style) */
  --glass-bg: rgba(255, 255, 255, 0.07);
  --glass-bg-2: rgba(255, 255, 255, 0.13);
  --glass-bd: rgba(255, 255, 255, 0.18);
  --glass-hi: rgba(255, 255, 255, 0.45);
  --glass-blur: blur(22px) saturate(180%);
  --glass-shadow: 0 10px 30px -14px rgba(0, 0, 0, 0.6);
  --glass-inset: inset 0 1px 0 var(--glass-hi), inset 0 -1px 1px rgba(0, 0, 0, 0.18);

  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-pill: 999px;
  --gap: clamp(14px, 1.6vw, 20px);
  --pad-x: clamp(18px, 5vw, 72px);
  --maxw: 1240px;
  --header-h: 66px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 0.16s var(--ease);
  --t: 0.3s var(--ease);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Roboto, sans-serif;
  --font-num: "Segoe UI", var(--font);
}

[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-2: #ffffff;
  --surface: rgba(15, 23, 42, 0.025);
  --surface-2: rgba(15, 23, 42, 0.05);
  --border: rgba(15, 23, 42, 0.09);
  --border-2: rgba(15, 23, 42, 0.16);
  --text: #131b2e;
  --text-soft: #4d586f;
  --text-dim: #8590a6;
  --shadow: 0 8px 24px -16px rgba(20, 30, 60, 0.2);
  --shadow-lg: 0 24px 50px -26px rgba(20, 30, 60, 0.25);
  --ring: rgba(91, 140, 255, 0.35);
  --glow-1: rgba(91, 140, 255, 0.16);
  --glow-2: rgba(139, 123, 251, 0.14);
  --glow-3: rgba(34, 211, 238, 0.10);
  --glass-bg: rgba(255, 255, 255, 0.42);
  --glass-bg-2: rgba(255, 255, 255, 0.6);
  --glass-bd: rgba(255, 255, 255, 0.7);
  --glass-hi: rgba(255, 255, 255, 0.95);
  --glass-blur: blur(22px) saturate(170%);
  --glass-shadow: 0 10px 30px -16px rgba(20, 30, 60, 0.25);
  --glass-inset: inset 0 1px 0 var(--glass-hi), inset 0 -1px 1px rgba(20, 30, 60, 0.06);
}

/* ----- 2. Reset & base ----- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--text);
  background-color: var(--bg);
  /* subtle static depth — two soft glows, no images, cheap to paint */
  background-image:
    radial-gradient(680px 520px at 6% 1%,   rgba(80, 130, 255, 0.42), transparent 55%),
    radial-gradient(620px 520px at 95% 7%,  rgba(150, 95, 250, 0.38), transparent 55%),
    radial-gradient(720px 640px at 24% 40%, rgba(34, 200, 235, 0.22), transparent 55%),
    radial-gradient(640px 640px at 90% 56%, rgba(236, 80, 150, 0.24), transparent 55%),
    radial-gradient(560px 560px at 14% 78%, rgba(45, 212, 191, 0.20), transparent 55%),
    radial-gradient(860px 760px at 60% 105%, rgba(99, 102, 241, 0.36), transparent 60%);
  background-attachment: fixed;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--t), color var(--t);
}

[data-theme="light"] body {
  background-image:
    radial-gradient(680px 520px at 6% 1%,   rgba(80, 130, 255, 0.30), transparent 55%),
    radial-gradient(620px 520px at 95% 7%,  rgba(150, 95, 250, 0.26), transparent 55%),
    radial-gradient(720px 640px at 24% 40%, rgba(34, 200, 235, 0.18), transparent 55%),
    radial-gradient(640px 640px at 90% 56%, rgba(236, 80, 150, 0.18), transparent 55%),
    radial-gradient(560px 560px at 14% 78%, rgba(45, 212, 191, 0.16), transparent 55%),
    radial-gradient(860px 760px at 60% 105%, rgba(99, 102, 241, 0.24), transparent 60%);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
:focus-visible { outline: 2px solid var(--brand-1); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--brand-2); color: #fff; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad-x); }
.lang-en { display: none; }
[data-lang="en"] .lang-zh { display: none; }
[data-lang="en"] .lang-en { display: revert; }

/* ----- 3. Header ----- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  display: flex; align-items: center;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  background: color-mix(in srgb, var(--bg) 58%, transparent);
  border-bottom: 1px solid var(--glass-bd);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15), inset 0 1px 0 var(--glass-hi);
}
.site-header .container { display: flex; align-items: center; gap: 18px; }

.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand__mark { width: 32px; height: 32px; }
.brand__name { font-size: 17px; font-weight: 700; letter-spacing: 0.2px; line-height: 1.1; }
.brand__name small {
  display: block; font-size: 9.5px; font-weight: 600; letter-spacing: 3.5px;
  color: var(--text-dim); text-transform: uppercase; margin-top: 1px;
}

.header-search { margin-left: auto; position: relative; flex: 1 1 300px; max-width: 420px; }
.header-search input {
  width: 100%; height: 40px; padding: 0 42px 0 40px;
  border-radius: var(--r-pill); border: 1px solid var(--glass-bd);
  background: var(--glass-bg); color: var(--text); font-size: 14px;
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-inset);
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}
.header-search input::placeholder { color: var(--text-dim); }
.header-search input:focus { border-color: var(--brand-1); box-shadow: 0 0 0 4px var(--ring); }
.header-search .icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-dim); pointer-events: none; }
.header-search kbd {
  position: absolute; right: 11px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-num); font-size: 11px; color: var(--text-dim);
  border: 1px solid var(--border-2); border-radius: 6px; padding: 2px 6px; line-height: 1;
}

.header-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.icon-btn {
  height: 38px; min-width: 38px; padding: 0; display: grid; place-items: center;
  border-radius: var(--r-pill); border: 1px solid var(--glass-bd);
  background: var(--glass-bg); color: var(--text-soft);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-inset); transition: all var(--t-fast);
}
.icon-btn:hover { color: var(--text); border-color: var(--glass-hi); background: var(--glass-bg-2); }
.icon-btn.is-text { padding: 0 14px; font-size: 12.5px; font-weight: 600; letter-spacing: 0.5px; }
.icon-btn.is-auto { position: relative; }
.icon-btn .theme-auto {
  position: absolute; right: -3px; bottom: -3px;
  min-width: 14px; height: 14px; padding: 0 2px; border-radius: 7px;
  font-size: 9px; font-weight: 800; line-height: 14px; text-align: center;
  color: #fff; background: var(--brand-1, #5b8cff);
  box-shadow: 0 0 0 2px var(--bg, #0b1120);
}

/* ----- 4. Hero ----- */
.hero { position: relative; overflow: hidden; isolation: isolate; }
.hero__bg {
  position: absolute; inset: 0; z-index: -2;
  background: url("../img/hero-dark.jpg") center / cover no-repeat;
  transform-origin: center;
  animation: heroZoom 26s var(--ease) infinite alternate;
}
@keyframes heroZoom { from { transform: scale(1.04); } to { transform: scale(1.13); } }
[data-theme="light"] .hero__bg { background-image: url("../img/hero-light.jpg"); }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 30%, transparent), color-mix(in srgb, var(--bg) 96%, transparent) 92%),
    linear-gradient(90deg, color-mix(in srgb, var(--bg) 55%, transparent), transparent 70%);
}
.hero__inner { padding-block: clamp(64px, 10vw, 124px); max-width: 720px; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 15px; border-radius: var(--r-pill);
  background: var(--glass-bg); border: 1px solid var(--glass-bd);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-inset);
  font-size: 12.5px; color: var(--text); margin-bottom: 24px;
}
.hero__badge .dot { width: 7px; height: 7px; border-radius: 50%; background: #34d399; box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.22); }
.hero h1 {
  font-size: clamp(34px, 5.6vw, 62px); line-height: 1.06; font-weight: 800;
  letter-spacing: -1.2px; margin-bottom: 20px;
}
.hero h1 .accent { background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__sub { font-size: clamp(15px, 1.8vw, 18px); color: var(--text-soft); max-width: 540px; margin-bottom: 30px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 9px; height: 46px; padding: 0 22px;
  border-radius: var(--r-pill); font-weight: 600; font-size: 14.5px;
  transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-fast); white-space: nowrap;
}
.btn--primary { background: var(--brand-grad); color: #fff; box-shadow: 0 10px 26px -10px var(--ring); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px -10px var(--ring); }
.btn--ghost {
  background: var(--glass-bg); border: 1px solid var(--glass-bd); color: var(--text);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-inset);
}
.btn--ghost:hover { border-color: var(--glass-hi); background: var(--glass-bg-2); transform: translateY(-2px); }

.hero__stats { display: flex; gap: clamp(28px, 5vw, 60px); margin-top: 46px; flex-wrap: wrap; }
.stat__num { font-family: var(--font-num); font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; line-height: 1; }
.stat__num .accent { background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat__label { font-size: 12.5px; color: var(--text-dim); margin-top: 7px; letter-spacing: 0.3px; }

/* ----- 5. Category nav ----- */
.catnav {
  position: sticky; top: var(--header-h); z-index: 90;
  background: color-mix(in srgb, var(--bg) 64%, transparent);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-bd);
  box-shadow: inset 0 1px 0 var(--glass-hi);
}
.catnav__track { display: flex; gap: 7px; overflow-x: auto; padding-block: 11px; scrollbar-width: none; }
.catnav__track::-webkit-scrollbar { display: none; }
.catpill {
  display: inline-flex; align-items: center; gap: 7px; white-space: nowrap;
  padding: 7px 14px; border-radius: var(--r-pill);
  border: 1px solid var(--glass-bd); background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-inset);
  color: var(--text-soft); font-size: 13px; font-weight: 500; transition: all var(--t-fast);
}
.catpill svg { width: 14px; height: 14px; color: var(--pip, var(--brand-1)); }
.catpill:hover { color: var(--text); border-color: var(--glass-hi); background: var(--glass-bg-2); }
.catpill.is-active { color: #fff; background: var(--brand-grad); border-color: transparent; }
.catpill.is-active svg { color: #fff; }

/* ----- 6. Sections ----- */
main { padding-block: clamp(40px, 6vw, 64px) 30px; }
.section { scroll-margin-top: calc(var(--header-h) + 60px); margin-bottom: clamp(44px, 6vw, 68px); }

.section__head { display: flex; align-items: center; gap: 16px; margin-bottom: 22px; }
.section__icon {
  width: 50px; height: 50px; flex-shrink: 0; border-radius: var(--r-md);
  display: grid; place-items: center; color: #fff; background: var(--accent, var(--brand-1));
  box-shadow: 0 10px 22px -10px var(--accent, var(--brand-1)); position: relative; overflow: hidden;
}
.section__icon::after { content: ""; position: absolute; inset: 0; background: linear-gradient(140deg, rgba(255,255,255,0.28), transparent 55%); }
.section__icon svg { width: 24px; height: 24px; position: relative; }
.section__meta { flex: 1; min-width: 0; }
.section__eyebrow { font-size: 11px; letter-spacing: 2px; text-transform: uppercase; color: var(--text-dim); font-family: var(--font-num); font-weight: 600; }
.section__title { font-size: clamp(20px, 2.8vw, 26px); font-weight: 750; letter-spacing: -0.4px; line-height: 1.2; }
.section__desc { color: var(--text-soft); font-size: 13.5px; }
.section__count {
  flex-shrink: 0; align-self: flex-start; margin-top: 4px;
  font-family: var(--font-num); font-size: 12px; font-weight: 600; color: var(--text-soft);
  padding: 4px 11px; border-radius: var(--r-pill); border: 1px solid var(--border); background: var(--surface);
}

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); gap: var(--gap); }

/* ----- 7. Card ----- */
.card {
  position: relative; display: flex; gap: 13px; align-items: flex-start;
  padding: 17px; border-radius: 18px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--glass-inset), var(--glass-shadow);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t), background var(--t);
  overflow: hidden; isolation: isolate;
}
/* accent edge that lights up on hover */
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; z-index: 2;
  background: var(--accent, var(--brand-1)); transform: scaleY(0); transform-origin: top; transition: transform var(--t);
}
/* specular sheen — the signature liquid-glass top-light streak */
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: 0; pointer-events: none;
  background:
    radial-gradient(240px circle at var(--mx, 28%) var(--my, -10%), var(--glass-hi), transparent 55%),
    linear-gradient(158deg, var(--glass-hi) 0%, transparent 30%);
  opacity: 0.4; mix-blend-mode: soft-light; transition: opacity var(--t);
}
.card > * { position: relative; z-index: 1; }
.card:hover {
  transform: translateY(-4px); border-color: var(--glass-hi);
  background: var(--glass-bg-2);
  box-shadow: var(--glass-inset), 0 26px 52px -20px rgba(0, 0, 0, 0.6);
}
.card:hover::before { transform: scaleY(1); }
.card:hover::after { opacity: 0.85; }

.card__icon {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 12px;
  overflow: hidden; position: relative; background: var(--surface-2);
  border: 1px solid var(--border);
}
.card__fav { width: 100%; height: 100%; object-fit: contain; background: #fff; padding: 7px; }
.card__mono {
  width: 100%; height: 100%; display: grid; place-items: center;
  font-weight: 700; font-size: 18px; color: #fff; background: var(--accent, var(--brand-1));
}
.card__body { min-width: 0; flex: 1; }
.card__name { font-size: 15px; font-weight: 650; display: flex; align-items: center; gap: 7px; }
.card__name .ext { opacity: 0; color: var(--text-dim); transition: opacity var(--t-fast), transform var(--t-fast); transform: translate(-3px, 3px); }
.card:hover .card__name .ext { opacity: 1; transform: none; }
.card__desc { font-size: 12.5px; color: var(--text-soft); margin-top: 3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card__host { font-size: 11px; color: var(--text-dim); margin-top: 8px; font-family: var(--font-num); }
.card__tag {
  position: absolute; top: 11px; right: 11px; font-size: 9.5px; font-weight: 700;
  letter-spacing: 0.8px; text-transform: uppercase; padding: 3px 7px; border-radius: 6px;
  background: var(--surface-2); color: var(--text-soft); border: 1px solid var(--border-2);
}

/* ----- 8. Empty state ----- */
.empty { text-align: center; padding: 76px 20px; color: var(--text-soft); display: none; }
.empty.is-on { display: block; }
.empty .big { font-size: 40px; margin-bottom: 10px; opacity: 0.8; }

/* ----- 9. Footer ----- */
.site-footer { border-top: 1px solid var(--border); padding-block: 44px 34px; margin-top: 24px; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; align-items: flex-start; }
.footer-brand { max-width: 340px; }
.footer-brand p { color: var(--text-soft); font-size: 13px; margin-top: 12px; }
.footer-note { font-size: 12px; color: var(--text-dim); line-height: 1.8; max-width: 460px; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 8px 22px; justify-content: space-between; align-items: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-dim); }

/* ----- 10. Back to top ----- */
.totop {
  position: fixed; right: 22px; bottom: 22px; z-index: 95;
  width: 44px; height: 44px; border-radius: 50%; background: var(--brand-grad); color: #fff;
  display: grid; place-items: center; box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(14px); pointer-events: none; transition: all var(--t);
}
.totop.is-on { opacity: 1; transform: none; pointer-events: auto; }
.totop:hover { transform: translateY(-3px); }

/* ----- 11. Reveal ----- */
.reveal { opacity: 0; transform: translateY(22px) scale(0.986); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

/* ----- 12. Responsive ----- */
/* tablets: lighten the glass blur a touch (cheaper to paint) */
@media (max-width: 920px) {
  :root { --glass-blur: blur(16px) saturate(165%); }
}

@media (max-width: 760px) {
  :root { --header-h: 58px; --glass-blur: blur(13px) saturate(150%); }
  .brand__name small { display: none; }
  .header-search { order: 3; flex-basis: 100%; max-width: none; margin: 0; }
  .site-header { height: auto; padding-block: 9px; }
  .site-header .container { flex-wrap: wrap; }
  .header-search input { height: 42px; }
  .header-search kbd { display: none; }
  .header-actions .icon-btn { height: 42px; min-width: 42px; }   /* larger touch target */
  .hero__inner { padding-block: clamp(46px, 11vw, 96px); }
  .hero h1 { font-size: clamp(30px, 8vw, 44px); }
  .hero__stats { gap: 22px; }
  .section__head { gap: 13px; }
  .section__icon { width: 44px; height: 44px; }
  .section__count { display: none; }
  .totop { right: 16px; bottom: 16px; }
}

/* phones: one comfortable column */
@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
  .card { padding: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}