/* ==========================================================================
   BT 资源搜索 —— 浅色主题设计系统
   ========================================================================== */
@font-face{font-family:'Space Grotesk';src:url(../fonts/space-grotesk-latin-600-normal.woff2) format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Space Grotesk';src:url(../fonts/space-grotesk-latin-700-normal.woff2) format('woff2');font-weight:700;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url(../fonts/jetbrains-mono-latin-400-normal.woff2) format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url(../fonts/jetbrains-mono-latin-500-normal.woff2) format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url(../fonts/jetbrains-mono-latin-700-normal.woff2) format('woff2');font-weight:700;font-display:swap}

:root{
  /* 浅色画布 */
  --bg:#f6f6f3;
  --bg-2:#ececE6;
  --card:#ffffff;
  --line:#e3e3dc;
  --line-2:#d3d3cb;
  /* 文字层次（浅底上加深，保证可读） */
  --ink:#14161a;
  --ink-2:#343941;
  --dim:#4f5761;
  --dim-2:#666e78;
  /* 强调色与语义色 */
  --acc:#2f4fd6;
  --acc-ink:#2440bb;
  --acc-soft:#edf0fd;
  --ok:#3f7a0c;
  --ok-soft:#eef6e4;
  --warn:#9c6102;
  --warn-soft:#fbf2e0;
  --danger:#c23a12;
  --danger-soft:#fcefea;
  /* 字体与阴影 */
  --font-display:'Space Grotesk',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --font-sans:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Segoe UI',sans-serif;
  --sh-1:0 1px 2px rgba(20,22,26,.04);
  --sh:0 1px 2px rgba(20,22,26,.04),0 10px 28px rgba(20,22,26,.055);
  --ease:cubic-bezier(.22,1,.36,1);
  --idx-w:26px;
  --idx-gap:12px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:var(--font-sans);
  font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased}
.ic{width:1em;height:1em;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.13em}
.wrap{max-width:1000px;margin:0 auto;padding:0 20px}
a{color:inherit}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px;border-radius:6px}

/* 环境光 + 3% 噪点 */
.ambient{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(880px 400px at 10% -10%,rgba(47,79,214,.06),transparent 62%),
             radial-gradient(680px 360px at 94% 2%,rgba(79,143,20,.04),transparent 60%)}
.ambient::after{content:"";position:absolute;inset:0;opacity:.03;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.topbar,main,.foot,.login-wrap{position:relative;z-index:1}

/* 顶栏 */
.topbar{position:sticky;top:0;z-index:20;background:rgba(246,246,243,.84);
  backdrop-filter:blur(14px) saturate(1.5);-webkit-backdrop-filter:blur(14px) saturate(1.5);
  border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-display);
  font-weight:700;font-size:16.5px;letter-spacing:-.01em;color:var(--ink)}
.brand-mark{width:9px;height:9px;border-radius:3px;background:var(--acc);
  box-shadow:0 0 0 4px var(--acc-soft);flex:none}
.brand-sep{color:var(--dim-2);margin:0 1px;font-weight:400}
.brand b{font-weight:600;color:var(--ink-2)}
.ghost{display:inline-flex;align-items:center;gap:7px;color:var(--dim);text-decoration:none;
  font-size:14px;padding:9px 13px;border-radius:9px;border:1px solid transparent;transition:.15s}
.ghost:hover{color:var(--ink);background:#fff;border-color:var(--line)}

/* 首屏 */
.hero{padding:34px 0 20px}
.eyebrow{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.28em;color:var(--dim-2);
  text-transform:uppercase;margin:0 0 11px}
.hero-title{font-family:var(--font-display);font-size:clamp(32px,5vw,46px);line-height:1.06;
  letter-spacing:-.035em;font-weight:700;margin:0 0 12px}
.hero-sub{margin:0;color:var(--dim);font-size:14.5px;max-width:62ch;
  text-wrap:pretty;word-break:keep-all;overflow-wrap:break-word}

/* 搜索卡 */
.search-card{background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:12px;box-shadow:var(--sh)}
.search-row{display:flex;align-items:center;gap:10px}
.search-field{display:flex;align-items:center;gap:10px;flex:1;min-width:0}
.search-ic{display:flex;color:var(--dim-2);flex:none}
#q{flex:1;min-width:0;border:0;outline:0;background:transparent;font-family:inherit;
  font-size:16px;color:var(--ink);padding:13px 4px}
#q::placeholder{color:var(--dim-2)}
#q::-webkit-search-cancel-button{-webkit-appearance:none}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--acc);color:#fff;
  border:0;border-radius:11px;padding:13px 22px;font-family:inherit;font-size:15px;
  font-weight:600;cursor:pointer;transition:background .15s,transform .12s var(--ease)}
.btn-primary:hover{background:var(--acc-ink)}
.btn-primary:active{transform:translateY(1px)}
.btn-primary:disabled{opacity:.55;cursor:default}
.btn-ic{display:flex}

.search-opts{display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  margin-top:11px;padding:11px 8px 3px;border-top:1px solid var(--line)}
.seg{display:inline-flex;background:var(--bg-2);border-radius:10px;padding:3px}
.seg button{border:0;background:transparent;color:var(--dim);font-family:inherit;font-size:13.5px;
  padding:7px 16px;border-radius:8px;cursor:pointer;transition:.15s}
.seg button:hover{color:var(--ink)}
.seg button.on{background:#fff;color:var(--acc-ink);font-weight:600;box-shadow:0 1px 3px rgba(20,22,26,.09)}
.switch{margin-left:auto;display:inline-flex;align-items:center;gap:9px;cursor:pointer;
  user-select:none;font-size:13.5px;color:var(--dim);padding:4px 2px}
.switch input{position:absolute;opacity:0;width:0;height:0}
.sw{width:38px;height:22px;border-radius:999px;background:#d6d6ce;position:relative;
  transition:background .18s;flex:none}
.sw::after{content:"";position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;
  background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.18);transition:transform .18s var(--ease)}
.switch input:checked + .sw{background:var(--acc)}
.switch input:checked + .sw::after{transform:translateX(16px)}
.switch input:focus-visible + .sw{box-shadow:0 0 0 3px var(--acc-soft)}
.sw-label{display:inline-flex;align-items:center;gap:5px}

/* 结果区 */
.results{padding:24px 0 36px}
.meta{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin-bottom:18px;
  font-family:var(--font-mono);font-size:12.5px;font-variant-numeric:tabular-nums;color:var(--dim)}
.meta b{color:var(--ink);font-weight:500}
.sites{display:flex;gap:7px;flex-wrap:wrap}
.tag{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line-2);background:#fff;
  border-radius:999px;padding:3px 10px;font-size:11.5px;color:var(--dim);font-family:var(--font-mono)}
.tag.down{color:var(--danger);border-color:#f0cfc6;background:var(--danger-soft)}

.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:15px 18px;
  margin-bottom:16px;box-shadow:var(--sh-1);transition:border-color .15s,box-shadow .15s}
.card:hover{border-color:var(--line-2);box-shadow:var(--sh)}
.card-hd{display:flex;gap:var(--idx-gap);align-items:flex-start}
.idx{font-family:var(--font-mono);font-size:12px;color:var(--dim-2);padding-top:4px;
  flex:none;width:var(--idx-w);font-variant-numeric:tabular-nums}
.card-title{margin:0;font-size:15.5px;font-weight:600;line-height:1.55;color:var(--ink);
  overflow-wrap:anywhere;word-break:break-word}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin:11px 0 0 calc(var(--idx-w) + var(--idx-gap))}
.chip{font-family:var(--font-mono);font-size:12px;border-radius:6px;padding:3px 8px;
  background:var(--bg-2);color:var(--dim);font-variant-numeric:tabular-nums;
  overflow-wrap:anywhere}
.chip.acc{background:var(--acc-soft);color:var(--acc-ink)}
.chip.ok{background:var(--ok-soft);color:var(--ok)}
.chip.warn{background:var(--warn-soft);color:var(--warn)}
.acts{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 0 calc(var(--idx-w) + var(--idx-gap))}
.acts .btn{display:inline-flex;align-items:center;gap:7px;font-family:inherit;font-size:13px;
  padding:8px 13px;border-radius:9px;border:1px solid var(--line-2);background:#fff;
  color:var(--ink-2);text-decoration:none;cursor:pointer;transition:.15s}
.acts .btn:hover{border-color:var(--acc);color:var(--acc-ink);background:var(--acc-soft)}
.acts .btn.p{background:var(--ink);border-color:var(--ink);color:#fff}
.acts .btn.p:hover{background:var(--acc);border-color:var(--acc);color:#fff}

/* 空态 / 加载态 */
.empty{text-align:center;padding:60px 0 50px;color:var(--dim-2)}
.empty-ic{display:inline-flex;color:var(--dim-2);margin-bottom:13px}
.empty-ic .ic{width:30px;height:30px;stroke-width:1.4}
.empty-t{margin:0;font-size:15px;color:var(--dim)}
.empty-s{margin:7px 0 0;font-size:13px;color:var(--dim-2)}
.spin{width:15px;height:15px;border:2px solid var(--line-2);border-top-color:var(--acc);
  border-radius:50%;display:inline-block;animation:r .7s linear infinite;vertical-align:-2px;margin-right:8px}
@keyframes r{to{transform:rotate(360deg)}}

/* 页脚 */
.foot{border-top:1px solid var(--line);margin-top:10px;padding-top:20px;padding-bottom:36px;
  color:var(--dim-2);font-size:12.5px}
.foot p{margin:0}

/* 提示条 */
.toast{position:fixed;left:50%;bottom:30px;transform:translateX(-50%) translateY(10px);
  background:var(--ink);color:#fff;padding:10px 18px;border-radius:10px;font-size:13.5px;
  opacity:0;transition:opacity .22s var(--ease),transform .22s var(--ease);pointer-events:none;z-index:50}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* 登录页 */
.login-body{display:flex;align-items:center;justify-content:center;min-height:100vh}
.login-wrap{width:100%;display:flex;justify-content:center;padding:24px}
.login-card{width:min(94vw,392px);background:var(--card);border:1px solid var(--line);
  border-radius:18px;padding:34px 30px;box-shadow:0 24px 60px rgba(20,22,26,.10);
  animation:fade .5s var(--ease) both}
@keyframes fade{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.login-brand{margin-bottom:22px}
.login-title{font-family:var(--font-display);font-size:22px;letter-spacing:-.025em;
  font-weight:700;margin:0 0 20px}
.field{display:flex;align-items:center;gap:9px;border:1px solid var(--line-2);border-radius:11px;
  padding:0 13px;background:#fcfcfa;transition:.15s}
.field:focus-within{border-color:var(--acc);background:#fff;box-shadow:0 0 0 3px var(--acc-soft)}
.field-ic{display:flex;color:var(--dim-2)}
.field input{flex:1;min-width:0;border:0;outline:0;background:transparent;padding:13px 0;
  font-family:inherit;font-size:15px;color:var(--ink)}
.login-btn{width:100%;justify-content:center;margin-top:14px;padding:13px}
.login-err{display:flex;align-items:center;gap:7px;color:var(--danger);font-size:13.5px;margin:14px 0 0}
.login-note{margin:18px 0 0;text-align:center;font-size:12.5px;color:var(--dim-2)}

/* 进场动画（仅内容页，登录页用 CSS keyframes 不依赖 JS） */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}

@media (max-width:640px){
  .wrap{padding:0 16px}
  .hero{padding:24px 0 16px}
  .hero-sub{font-size:14px}
  .search-row{flex-wrap:wrap;gap:10px}
  .search-field{flex:1 1 100%;border:1px solid var(--line-2);border-radius:12px;
    padding:0 12px;background:#fcfcfa}
  .btn-primary{width:100%;flex:0 0 100%;justify-content:center}
  #q{flex:1 1 auto;min-width:0;padding:12px 0}
  .search-opts{gap:10px}
  .seg button{padding:7px 12px;font-size:13px}
  .switch{margin-left:0}
  .results{padding:18px 0 30px}
  .card{padding:15px}
  .chips,.acts{margin-left:0}
  :root{--idx-gap:10px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1!important;transform:none!important}
  .ambient{display:none}
}