:root {
    --bg: #fff; --bg-soft: #f8f9fb; --bg-card: #fff; --bg-hover: #eef1f5;
    --text: #1a1a1a; --text-soft: #57606a; --text-muted: #8b949e;
    --border: #e1e4e8; --border-strong: #d8dce0;
    --shadow: 0 1px 4px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  }
  [data-theme="dark"] {
    --bg: #0d1117; --bg-soft: #161b22; --bg-card: #161b22; --bg-hover: #21262d;
    --text: #e6edf3; --text-soft: #c9d1d9; --text-muted: #8b949e;
    --border: #30363d; --border-strong: #444c56;
    --shadow: 0 1px 4px rgba(0,0,0,0.4), 0 4px 12px rgba(0,0,0,0.3);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #0d1117; --bg-soft: #161b22; --bg-card: #161b22; --bg-hover: #21262d;
      --text: #e6edf3; --text-soft: #c9d1d9; --text-muted: #8b949e;
      --border: #30363d; --border-strong: #444c56;
      --shadow: 0 1px 4px rgba(0,0,0,0.4), 0 4px 12px rgba(0,0,0,0.3);
    }
  }

  .ts-wrap { position: relative; margin-left: auto; align-self: center; z-index: 100; margin-top: -6px; }
  .ts-btn {
    width: 28px; height: 28px; border-radius: 50%;
    border: 1px solid var(--border-strong);
    background: var(--bg-card); color: var(--text);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; padding: 0;
    transition: background 0.15s, transform 0.15s;
    -webkit-tap-highlight-color: transparent;
  }
  .ts-btn:hover { background: var(--bg-hover); }
  .ts-btn:active { transform: scale(0.96); }
  .ts-btn svg { width: 14px; height: 14px; stroke: currentColor; }
  .ts-menu {
    position: absolute; top: 44px; right: 0; min-width: 148px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 10px; box-shadow: var(--shadow); padding: 4px; display: none;
  }
  .ts-menu.open { display: block; }
  .ts-item {
    display: flex; align-items: center; gap: 10px; width: 100%;
    padding: 8px 12px; background: transparent; border: none; color: var(--text);
    font: inherit; font-size: 14px; border-radius: 6px; cursor: pointer; text-align: left;
    -webkit-tap-highlight-color: transparent;
  }
  .ts-item:hover { background: var(--bg-hover); }
  .ts-item svg { width: 16px; height: 16px; stroke: currentColor; flex-shrink: 0; }
  .ts-item[aria-current="true"] { background: var(--bg-hover); font-weight: 500; }
  @media (max-width: 480px) { .ts-btn { width: 26px; height: 26px; } .ts-btn svg { width: 13px; height: 13px; } }

  body { background: var(--bg) !important; color: var(--text) !important; }
  .ping-item { background: var(--bg-card); border-color: var(--border) !important; color: var(--text); }
  .ping-item:hover { background: var(--bg-hover) !important; }
  .nav a { color: var(--text-soft); white-space: nowrap; flex-shrink: 0; }
  .nav a:hover, .nav a.active { color: var(--text); }
  footer, footer a { color: var(--text-muted) !important; }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  html, body { overflow-x: clip; }
  body {
    font-family: system-ui, sans-serif;
    background: var(--bg-card); color: var(--text); min-height: 100vh; line-height: 1.6; max-width: 100vw;
  }
  .container { max-width: 1000px; margin: 0 auto; padding: 24px 20px; }
  .nav { display: flex; flex-wrap: wrap; row-gap: 8px; gap: 20px; margin-bottom: 20px; font-size: 0.9em; align-items: center; }
  .nav a { color: var(--text-soft); text-decoration: none; padding-bottom: 4px; border-bottom: 2px solid transparent; -webkit-tap-highlight-color: transparent; outline: none; display: inline-block; line-height: 1.5; white-space: nowrap; flex-shrink: 0; }
  .nav a:hover { color: var(--text); }
  .nav a:focus, .nav a:active { outline: none; }
  .nav a.active { color: var(--text); font-weight: 600; border-bottom: 2px solid var(--text); }
  .nav .short { display: none; }
  .nav .shortest { display: none; }
  .nav .pc-only-new { display: inline-flex; align-items: center; gap: 4px; }
  @media (max-width: 580px) { .nav .pc-only-new { display: none; } }
  @media (max-width: 580px) { .nav .full { display: none; } .nav .short { display: inline; } .nav { gap: 14px; } }
  @media (max-width: 399px) { .nav a[href="https://ip.net.coffee/claude/"] .short { display: none; } .nav a[href="https://ip.net.coffee/claude/"] .shortest { display: inline; } .nav { gap: 12px; } }
  @media (max-width: 339px) { .nav { gap: 8px; font-size: 0.88em; } }
  .nav-more{position:relative;display:inline-flex;align-items:center}.nav-more-trigger{cursor:pointer;display:inline-flex;align-items:center;gap:3px;color:var(--text-soft,#666);line-height:1.5;border-bottom:2px solid transparent;padding-bottom:4px;white-space:nowrap}.nav-more:hover .nav-more-trigger{color:var(--text,#1a1a1a)}.nav-more-arrow{transition:transform .15s}.nav-more:hover .nav-more-arrow{transform:rotate(180deg)}.nav-more-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);margin-top:2px;background:var(--bg-card,#fff);border:1px solid var(--border,#e1e4e8);border-radius:9px;box-shadow:0 4px 16px rgba(0,0,0,0.12);padding:5px;min-width:120px;opacity:0;visibility:hidden;transition:opacity .15s;z-index:300}.nav-more:hover .nav-more-menu{opacity:1;visibility:visible}.nav-more-menu a{display:block;padding:8px 12px;border-radius:6px;border-bottom:none !important;white-space:nowrap;color:var(--text,#1a1a1a);font-size:0.95em}.nav-more-menu a:hover{background:var(--bg-hover,#eef1f5)}.nav-more-menu::before{content:"";position:absolute;left:-12px;right:-12px;top:-18px;height:18px}.nav-more-menu{transition:opacity .15s ease,visibility 0s linear .35s}.nav-more:hover .nav-more-menu{transition:opacity .15s ease,visibility 0s}

  header { margin-bottom: 20px; }
  header h1 { font-size: 1.75em; font-weight: 700; margin-bottom: 8px; }
  @media (max-width: 480px) { header h1 { font-size: 1.4em; } }
  header p.desc { color: var(--text-soft); font-size: 0.9em; line-height: 1.5; }

  .link-controls {
    display: flex; align-items: center; flex-wrap: wrap; gap: 14px;
    margin: 18px 0 26px; padding: 12px 14px;
    border: 1px solid var(--border); border-radius: 10px; background: var(--bg-soft);
  }
  .retest-btn {
    display: inline-flex; align-items: center; gap: 7px;
    padding: 8px 16px; border: 1px solid var(--border-strong); border-radius: 8px;
    background: var(--bg-card); color: var(--text); font: inherit; font-size: 0.9em; font-weight: 600;
    cursor: pointer; transition: background 0.15s, transform 0.1s; -webkit-tap-highlight-color: transparent;
  }
  .retest-btn:hover { background: var(--bg-hover); }
  .retest-btn:active { transform: scale(0.97); }
  .retest-btn:disabled { opacity: 0.55; cursor: default; }
  .retest-btn svg { width: 15px; height: 15px; stroke: currentColor; fill: none; stroke-width: 2; }
  .retest-btn.spinning svg { animation: spin 0.9s linear infinite; }
  @keyframes spin { to { transform: rotate(360deg); } }
  .legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.8em; color: var(--text-soft); margin-left: auto; }
  .legend span { display: inline-flex; align-items: center; gap: 5px; }
  .legend i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }

  .country-block { margin-bottom: 30px; }
  .country-head { display: flex; align-items: center; gap: 9px; margin-bottom: 12px; }
  .country-flag { width: 26px; height: auto; border-radius: 3px; box-shadow: 0 0 0 1px var(--border); flex-shrink: 0; }
  .country-globe { box-shadow: none; border-radius: 0; display: block; }
  .country-head h2 { font-size: 1.12em; font-weight: 700; }
  .country-sum { font-size: 0.8em; color: var(--text-muted); font-weight: 500; margin-left: 4px; }
  .country-sum b { color: var(--text-soft); font-weight: 700; }
  .group-refresh { margin-left: auto; display: inline-flex; align-items: center; gap: 5px; padding: 4px 11px; border: 1px solid var(--border-strong); border-radius: 7px; background: var(--bg-card); color: var(--text-soft); font: inherit; font-size: 0.78em; font-weight: 500; cursor: pointer; transition: background 0.15s, color 0.15s; -webkit-tap-highlight-color: transparent; flex-shrink: 0; }
  .group-refresh:hover { background: var(--bg-hover); color: var(--text); }
  .group-refresh:active { transform: scale(0.97); }
  .group-refresh:disabled { opacity: 0.55; cursor: default; }
  .group-refresh svg { width: 12px; height: 12px; stroke: currentColor; fill: none; stroke-width: 2; }
  .group-refresh.spinning svg { animation: spin 0.9s linear infinite; }
  @media (max-width: 480px) { .group-refresh { padding: 4px 9px; font-size: 0.74em; gap: 4px; } }

  .ping-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 7px; }
  @media (max-width: 900px) { .ping-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
  @media (max-width: 720px) { .ping-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; } }
  .ping-item {
    border: 1px solid var(--border); border-radius: 8px; padding: 7px 9px;
    display: flex; align-items: center; gap: 7px; font-size: 0.8em; min-width: 0;
  }
  .ping-item img.ping-icon { width: 17px; height: 17px; border-radius: 4px; flex-shrink: 0; object-fit: contain; }
  .ping-item .ping-name { flex: 1; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .ping-item .ping-ms { font-size: 1em; font-weight: 700; min-width: 3.3em; text-align: right; white-space: nowrap; flex-shrink: 0; }
  .ping-dots { display: flex; gap: 2px; margin-top: 4px; }
  .ping-dot { width: 6px; height: 6px; border-radius: 50%; }
  .dot-good { background: #1b8a2d; }
  .dot-warn { background: #6fcf7c; }
  .dot-bad { background: #f0c040; }
  .dot-fail { background: #b2bec3; }
  .dot-pending { background: #dfe6e9; }
  [data-theme="dark"] .dot-pending { background: #2d333b; }
  @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .dot-pending { background: #2d333b; } }

  .method-note {
    margin: 8px 0 4px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px;
    background: var(--bg-soft); color: var(--text-soft); font-size: 0.82em; line-height: 1.7;
  }
  .method-note b { color: var(--text); }
  .section-divider { border: none; border-top: 1px solid var(--border); margin: 20px 0 0; }