/* ==========================================================================
   Nimbus Next Looking Glass — design system
   ========================================================================== */

:root {
  --primary: #0066cc;
  --primary-dark: #004494;
  --accent: #ff6b00;
  --ink: #14202e;
  --ink-2: #3c4a5c;
  --ink-3: #7a8aa0;
  --bg: #f5f7fa;
  --card: #ffffff;
  --border: #e2e8f0;
  --terminal-bg: #0e1420;
  --terminal-fg: #c9d6e8;
  --terminal-dim: #5a6b85;
  --ok: #16a34a;
  --warn: #d97706;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16, 32, 54, .05), 0 8px 24px rgba(16, 32, 54, .06);
  --shadow-lg: 0 2px 6px rgba(16, 32, 54, .06), 0 18px 48px rgba(16, 32, 54, .10);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(0, 102, 204, .08), transparent 60%),
    radial-gradient(900px 400px at -10% 0%, rgba(255, 107, 0, .05), transparent 55%),
    var(--bg);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 22px; }
.mono { font-family: var(--mono); font-size: .92em; }
.accent { color: var(--primary); font-weight: 600; }
.hidden { display: none !important; }

/* ---------- header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; gap: 22px;
  padding-top: 14px; padding-bottom: 14px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; flex-shrink: 0; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; font-weight: 800; font-size: 21px;
  display: grid; place-items: center;
  box-shadow: 0 4px 12px rgba(0, 102, 204, .35);
}
.brand-logo { height: 36px; width: auto; max-width: 180px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 15px; letter-spacing: .01em; }
.brand-text small { font-size: 11.5px; color: var(--ink-3); letter-spacing: .14em; text-transform: uppercase; }

.node-nav { display: flex; gap: 8px; flex-wrap: wrap; margin-left: auto; }
.node-chip {
  padding: 7px 13px; border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink-2); text-decoration: none;
  font-size: 12.5px; font-weight: 600; letter-spacing: .01em;
  transition: all .18s ease;
  white-space: nowrap;
}
.node-chip:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.node-chip.active {
  background: var(--primary); border-color: var(--primary); color: #fff;
  box-shadow: 0 4px 14px rgba(0, 102, 204, .35);
}

/* ---------- meta strip ---------- */

.meta-strip {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}
.meta-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex; flex-direction: column; gap: 2px;
  box-shadow: var(--shadow);
}
.meta-label { font-size: 11px; color: var(--ink-3); letter-spacing: .1em; text-transform: uppercase; font-weight: 600; }
.meta-value { font-size: 14.5px; font-weight: 600; color: var(--ink); word-break: break-all; }

/* ---------- layout ---------- */

.layout {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: start;
}

/* ---------- sidebar ---------- */

.sidebar { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 96px; }
.tool-group {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 6px;
}
.tool-group-title {
  font-size: 11px; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-3);
  padding: 2px 8px 8px;
}
.tool-btn {
  appearance: none; border: 1px solid transparent; background: transparent;
  text-align: left; padding: 9px 12px; border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 14px; font-weight: 600; color: var(--ink-2);
  cursor: pointer; transition: all .15s ease;
  display: flex; align-items: center; gap: 8px;
}
.tool-btn:hover { background: rgba(0, 102, 204, .07); color: var(--primary); }
.tool-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; box-shadow: 0 4px 12px rgba(0, 102, 204, .3);
}
.tool-bench.active { background: linear-gradient(135deg, var(--accent), #cc5500); box-shadow: 0 4px 12px rgba(255, 107, 0, .3); }

/* ---------- content ---------- */

.content {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px;
  box-shadow: var(--shadow-lg);
  min-height: 420px;
}

.input-label { font-size: 13px; font-weight: 600; color: var(--ink-2); display: block; margin-bottom: 8px; }
.input-row { display: flex; gap: 10px; }
.input-row input {
  flex: 1; padding: 12px 16px;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-family: var(--mono); font-size: 14.5px; color: var(--ink);
  background: #fbfcfe;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.input-row input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(0, 102, 204, .12);
  background: #fff;
}
.input-hint { margin-top: 8px; font-size: 12.5px; color: var(--ink-3); font-family: var(--mono); }

.btn-primary {
  appearance: none; border: none; cursor: pointer;
  padding: 12px 26px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; font-family: var(--font); font-size: 14.5px; font-weight: 700; letter-spacing: .02em;
  box-shadow: 0 4px 14px rgba(0, 102, 204, .35);
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s;
  white-space: nowrap;
}
.btn-primary:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0, 102, 204, .45); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; }

.btn-ghost {
  appearance: none; border: 1px solid var(--border); background: transparent;
  color: var(--ink-3); font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: 6px; cursor: pointer;
  margin-left: auto;
}
.btn-ghost:hover { color: #fff; border-color: #fff3; }

/* ---------- panels ---------- */

.panel-title { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.panel-desc { font-size: 13.5px; color: var(--ink-2); margin-bottom: 18px; max-width: 60ch; }
.panel-desc a { color: var(--primary); text-decoration: none; font-weight: 600; }
.panel-desc a:hover { text-decoration: underline; }
.panel-hint { font-size: 11.5px; color: var(--ink-3); margin-top: 8px; }

/* ---------- unlock grid ---------- */

.unlock-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 10px;
}
.unlock-card {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: #fbfcfe;
  font-size: 13px; font-weight: 600;
  transition: transform .15s ease;
}
.unlock-card:hover { transform: translateY(-1px); }
.unlock-badge {
  width: 36px; height: 36px; border-radius: 8px; flex-shrink: 0;
  display: grid; place-items: center;
  font-size: 16px; font-weight: 800; color: #fff;
}
.badge-yes { background: linear-gradient(135deg, #16a34a, #15803d); }
.badge-no { background: linear-gradient(135deg, #6b7280, #4b5563); }
.badge-banned { background: linear-gradient(135deg, #dc2626, #b91c1c); }
.badge-err { background: linear-gradient(135deg, #d97706, #b45309); }
.badge-restricted { background: linear-gradient(135deg, #9333ea, #7c3aed); }
.unlock-name { color: var(--ink); flex: 1; }
.unlock-region { font-size: 11px; color: var(--ink-3); font-weight: 500; }
.unlock-cat {
  grid-column: 1 / -1;
  font-size: 12px; font-weight: 700; color: var(--ink-3);
  letter-spacing: .1em; text-transform: uppercase;
  padding: 14px 4px 4px; margin-top: 4px;
  border-top: 1px solid var(--border);
}

/* ---------- fast-trace tabs ---------- */

.ft-tabs { display: flex; gap: 0; margin: 18px 0 0; border-bottom: 2px solid var(--border); }
.ft-tab {
  appearance: none; border: none; background: transparent;
  padding: 10px 22px; border-bottom: 2px solid transparent; margin-bottom: -2px;
  font-family: var(--font); font-size: 13.5px; font-weight: 700; color: var(--ink-3);
  cursor: pointer; transition: all .15s ease;
}
.ft-tab:hover { color: var(--primary); }
.ft-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.ft-tab.done { color: var(--ok); }
.ft-tab.error { color: #dc2626; }

.ft-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 16px;
}
.ft-elapsed { font-size: 13px; color: var(--ink-3); }

/* ---------- trace table ---------- */

.trace-summary {
  margin: 14px 0 4px;
  font-size: 13px; color: var(--ink-2);
  display: flex; gap: 18px; flex-wrap: wrap;
}
.trace-summary strong { color: var(--ink); }

.trace-table-wrap {
  margin-top: 12px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
  max-height: 480px; overflow-y: auto;
}
.trace-table {
  width: 100%; border-collapse: collapse;
  font-size: 12.5px; font-family: var(--mono);
}
.trace-table thead th {
  position: sticky; top: 0; z-index: 2;
  background: #f0f4f9; color: var(--ink-2);
  font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  text-align: left; padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.trace-table tbody td {
  padding: 8px 14px; border-bottom: 1px solid #eef2f7;
  vertical-align: top;
}
.trace-table tbody tr:last-child td { border-bottom: none; }
.trace-table tbody tr:hover { background: #f6f9fc; }

.trace-hop { color: var(--ink-3); font-weight: 600; width: 34px; }
.trace-ip { color: var(--primary); font-weight: 600; word-break: break-all; }
.trace-host { display: block; color: var(--ink-3); font-size: 11px; }
.trace-rtt { color: var(--ink); font-variant-numeric: tabular-nums; white-space: nowrap; }
.trace-rtt.fast { color: var(--ok); }
.trace-rtt.slow { color: #dc2626; }
.trace-loc { color: var(--ink-2); white-space: nowrap; }
.trace-asn { color: var(--ink-3); font-size: 11.5px; }
.trace-timeout { color: var(--ink-3); font-style: italic; }

/* ---------- terminal ---------- */

.terminal-wrap {
  margin-top: 22px;
  border-radius: var(--radius-sm); overflow: hidden;
  border: 1px solid #1c2740;
  box-shadow: 0 12px 32px rgba(10, 18, 32, .25);
}
.terminal-bar {
  display: flex; align-items: center; gap: 7px;
  background: #172033; padding: 10px 14px;
}
.t-dot { width: 11px; height: 11px; border-radius: 50%; }
.t-dot.red { background: #ff5f57; } .t-dot.yellow { background: #febc2e; } .t-dot.green { background: #28c840; }
.terminal-title { margin-left: 8px; font-size: 12px; color: #8fa3c4; font-family: var(--mono); }
.terminal {
  background: var(--terminal-bg); color: var(--terminal-fg);
  font-family: var(--mono); font-size: 13px; line-height: 1.65;
  padding: 16px 18px;
  min-height: 180px; max-height: 520px; overflow: auto;
  white-space: pre-wrap; word-break: break-word;
}
.terminal .cmd-echo { color: #7ec8ff; }
.terminal .err { color: #ff8589; }

/* ---------- footer ---------- */

.site-footer {
  margin: 44px 0 30px; text-align: center;
  font-size: 12.5px; color: var(--ink-3);
}
.site-footer a { color: var(--primary); text-decoration: none; font-weight: 600; }
.credits { margin-top: 4px; font-size: 11px; color: var(--ink-3); }
.credits a { color: var(--ink-3); text-decoration: underline; font-weight: 500; }
.credits a:hover { color: var(--primary); }

/* ---------- speedtest gauge ---------- */

.gauge-wrap { display: flex; flex-direction: column; align-items: center; padding: 8px 0 4px; }
.gauge { position: relative; width: 240px; height: 240px; }
.gauge-svg { width: 100%; height: 100%; transform: rotate(-270deg); }
.gauge-track {
  fill: none; stroke: var(--border); stroke-width: 14;
  stroke-dasharray: 471.24 628.32; /* 3/4 circle arc */
  stroke-linecap: round;
}
.gauge-fill {
  fill: none; stroke: url(#gaugeGrad); stroke-width: 14;
  stroke-linecap: round;
  stroke-dasharray: 0 628.32;
  transition: stroke-dasharray .25s ease, stroke .3s ease;
  stroke: var(--primary);
}
.gauge-center {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
}
.gauge-value {
  font-size: 52px; font-weight: 800; line-height: 1;
  color: var(--ink); font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}
.gauge-unit { font-size: 13px; font-weight: 600; color: var(--ink-3); margin-top: 2px; letter-spacing: .1em; }
.gauge-phase { font-size: 12.5px; font-weight: 600; color: var(--primary); margin-top: 10px; min-height: 18px; }
.gauge-btn { margin-top: 18px; min-width: 180px; }
.gauge.running .gauge-fill { stroke: var(--primary); }
.gauge.upload .gauge-fill { stroke: var(--accent); }
.gauge.done .gauge-fill { stroke: var(--ok); }

.speed-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
  margin-top: 26px;
}
.stat-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: #fbfcfe;
  transition: transform .2s ease, box-shadow .2s ease;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(16,32,54,.08); }
.stat-icon {
  width: 38px; height: 38px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center;
  font-size: 18px; font-weight: 800; color: #fff;
}
.stat-icon.down { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
.stat-icon.up { background: linear-gradient(135deg, var(--accent), #cc5500); }
.stat-icon.ping { background: linear-gradient(135deg, #0e9f6e, #057a55); }
.stat-icon.jitter { background: linear-gradient(135deg, #7c3aed, #5b21b6); }
.stat-body { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.stat-label { font-size: 11px; font-weight: 600; color: var(--ink-3); letter-spacing: .08em; }
.stat-value { font-size: 22px; font-weight: 800; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat-unit { font-size: 11px; color: var(--ink-3); }

.speed-note {
  margin-top: 20px; text-align: center;
  font-size: 12.5px; color: var(--ink-3);
}
.speed-note.error { color: #dc2626; font-weight: 600; }

/* gauge SVG gradient (defined inline in JS via defs) */
@media (max-width: 640px) {
  .speed-stats { grid-template-columns: repeat(2, 1fr); }
  .gauge { width: 200px; height: 200px; }
  .gauge-value { font-size: 42px; }
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; flex-direction: row; overflow-x: auto; padding-bottom: 4px; }
  .tool-group { flex-direction: row; align-items: center; flex-shrink: 0; padding: 8px; }
  .tool-group-title { display: none; }
  .tool-btn { white-space: nowrap; }
  .header-inner { gap: 12px; }
  .node-nav { margin-left: 0; }
  .content { padding: 18px; }
  .input-row { flex-direction: column; }
}