:root {
  --bg: #f2f5f8;
  --panel: #ffffff;
  --panel-border: #dbe2ea;
  --text: #1b2430;
  --text-muted: #5b6675;
  --accent: #0b6eeb;
  --accent-strong: #0757bb;
  --ok: #1f8a70;
  --warn: #c07f0a;
  --err: #b3261e;
  --term-bg: #141a21;
  --term-text: #d7dee6;
  --term-accent: #e0a458;
  --radius: 10px;
  --font-ui: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

:root[data-theme="dark"] {
  --bg: #071018;
  --panel: #0d1924;
  --panel-border: #1d3142;
  --text: #dbe2ea;
  --text-muted: #8a97a8;
  --accent: #45a3ff;
  --accent-strong: #79bcff;
  --ok: #3bbd9a;
  --warn: #e0a83c;
  --err: #e2685f;
  --term-bg: #0a0e13;
  --term-text: #d7dee6;
  --term-accent: #e6b878;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 12% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 32rem),
    radial-gradient(circle at 95% 8%, color-mix(in srgb, var(--ok) 9%, transparent), transparent 28rem);
}

button, input, select { font: inherit; }
button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: 2px;
}

h2, h3 { font-weight: 600; letter-spacing: -0.01em; }
h2 { font-size: 1.25rem; margin: 0; }
h3 { font-size: 0.95rem; margin: 1.75rem 0 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

.top-accent {
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #42c7b0 55%, #71d57b);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem max(1.25rem, calc((100vw - 1120px) / 2));
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand-symbol { width: 2.15rem; height: 2.15rem; display: flex; align-items: end; justify-content: center; gap: 3px; padding: 0.5rem; border-radius: 9px; background: var(--accent); box-shadow: 0 8px 20px color-mix(in srgb, var(--accent) 25%, transparent); }
.brand-symbol i { display: block; width: 3px; border-radius: 4px; background: #fff; }
.brand-symbol i:nth-child(1) { height: 38%; opacity: .72; }
.brand-symbol i:nth-child(2) { height: 68%; opacity: .86; }
.brand-symbol i:nth-child(3) { height: 100%; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.1; }
.brand-mark { font-weight: 800; font-size: 1.08rem; letter-spacing: -0.03em; }
.brand-sub { margin-top: .18rem; font-size: 0.66rem; color: var(--text-muted); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .05em; }

.topbar-actions { display: flex; align-items: center; gap: 0.75rem; }

.btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.62rem 1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, box-shadow .15s ease;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 18px color-mix(in srgb, var(--accent) 22%, transparent); }
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); }
.btn-ghost { background: transparent; border-color: var(--panel-border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
}
.badge-muted { color: var(--text-muted); }
.badge-internal { color: var(--ok); border-color: var(--ok); }

.tabs {
  display: flex;
  gap: 0.25rem;
  padding: .5rem max(1.25rem, calc((100vw - 1120px) / 2));
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  border-bottom: 1px solid var(--panel-border);
  overflow-x: auto;
}

.tab {
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.58rem 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 18%, transparent); background: color-mix(in srgb, var(--accent) 9%, transparent); }

main { max-width: 1120px; margin: 0 auto; padding: 2.2rem 1.5rem 3rem; }

.hero { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(280px, .75fr); align-items: end; gap: 2.5rem; padding: 2.2rem 0 2.5rem; }
.eyebrow, .section-kicker { display: inline-flex; align-items: center; gap: .5rem; color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .095em; text-transform: uppercase; }
.live-dot { width: .48rem; height: .48rem; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 5px color-mix(in srgb, var(--ok) 13%, transparent); }
.hero h1 { max-width: 720px; margin: .75rem 0 .9rem; font-size: clamp(2.2rem, 5vw, 4.25rem); line-height: .98; letter-spacing: -.06em; font-weight: 820; }
.hero h1 span { color: var(--text-muted); }
.hero p { max-width: 650px; margin: 0; color: var(--text-muted); font-size: 1.02rem; }
.hero-protocols { display: grid; gap: .7rem; }
.protocol-card { position: relative; overflow: hidden; display: grid; grid-template-columns: auto 1fr; align-items: baseline; column-gap: .75rem; padding: 1rem 1.15rem; border: 1px solid var(--panel-border); border-radius: 14px; background: color-mix(in srgb, var(--panel) 88%, transparent); box-shadow: 0 14px 36px -28px rgba(7, 16, 24, .6); }
.protocol-card::after { content: ""; position: absolute; inset: 0 auto 0 0; width: 3px; background: var(--accent); }
.protocol-card.protocol-v6::after { background: var(--ok); }
.protocol-card strong { font-family: var(--font-mono); font-size: 1.05rem; }
.protocol-card small { grid-column: 2; color: var(--text-muted); font-family: var(--font-mono); font-size: .69rem; word-break: break-all; }
.protocol-kicker { color: var(--text-muted); font-size: .65rem; text-transform: uppercase; letter-spacing: .08em; }

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: 0 20px 60px -42px rgba(15, 23, 42, 0.38);
  padding: clamp(1.2rem, 3vw, 2rem);
}
:root[data-theme="dark"] .panel {
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 28px -16px rgba(0, 0, 0, 0.6);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.limit-note { font-size: 0.78rem; color: var(--text-muted); font-family: var(--font-mono); }

.tool-form {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 1rem;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
}
.tool-form label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}
.tool-form input, .tool-form select {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 0.45rem 0.55rem;
  border-radius: var(--radius);
  border: 1px solid var(--panel-border);
  background: var(--bg);
  color: var(--text);
  min-width: 9rem;
}
.tool-form input:focus, .tool-form select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.output-meta { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.4rem; font-family: var(--font-mono); }

.tool-intro { max-width: 780px; margin: -.25rem 0 1rem; color: var(--text-muted); }
.quick-resources, .prefix-list { display: flex; flex-wrap: wrap; gap: .55rem; margin: -.25rem 0 1rem; }
.resource-chip, .prefix-item {
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
  color: var(--text);
  font-family: var(--font-mono);
  font-size: .75rem;
  padding: .42rem .7rem;
  cursor: pointer;
}
.resource-chip:hover, .prefix-item:hover { color: var(--accent); border-color: var(--accent); }
.prefix-item { border-radius: 8px; }
.prefix-v6 { background: color-mix(in srgb, var(--ok) 8%, var(--panel)); }
.bgp-summary { margin: 1rem 0; }
.routes-head { margin-top: 1.4rem; margin-bottom: .65rem; }
.routes-head h3 { margin: 0; }
#table-bgp-routes td:nth-child(5) { min-width: 24rem; }

.output-panel {
  background: var(--term-bg);
  color: var(--term-text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 4rem;
  border: 1px solid #000a;
}

.score-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 7%, var(--panel)), var(--panel));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
}
.score-ring {
  --pct: 0;
  --ring-color: var(--accent);
  width: 5.5rem;
  height: 5.5rem;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: conic-gradient(var(--ring-color) calc(var(--pct) * 1%), var(--panel-border) 0);
  transition: background 0.5s ease;
}
.score-ring-inner {
  width: 4.15rem;
  height: 4.15rem;
  border-radius: 50%;
  background: var(--panel);
  display: flex;
  align-items: center;
  justify-content: center;
}
#score-badge { font-family: var(--font-mono); font-size: 1.3rem; font-weight: 700; color: var(--text); }
.score-list { list-style: none; margin: 0; padding: 0; font-size: 0.82rem; color: var(--text-muted); columns: 2; gap: 1rem; }
.score-list li { margin-bottom: 0.2rem; }
.score-list li.pass::before { content: "✓ "; color: var(--ok); font-weight: 700; }
.score-list li.fail::before { content: "✕ "; color: var(--err); font-weight: 700; }

.table-wrap { overflow-x: auto; border: 1px solid var(--panel-border); border-radius: var(--radius); }
.data-table { width: 100%; border-collapse: collapse; background: var(--panel); font-size: 0.85rem; }
.data-table th, .data-table td { text-align: left; padding: 0.55rem 0.8rem; border-bottom: 1px solid var(--panel-border); }
.data-table th { color: var(--text-muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.03em; }
.data-table tbody tr:last-child td { border-bottom: none; }
.mono-table td { font-family: var(--font-mono); font-size: 0.78rem; }

.flag-icon {
  width: 1.2rem;
  height: 0.9rem;
  object-fit: cover;
  border-radius: 2px;
  vertical-align: middle;
  box-shadow: 0 0 0 1px var(--panel-border);
  margin-right: 0.15rem;
}

.speedtest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.speedtest-metric {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}
.speedtest-label { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }
.speedtest-value { font-family: var(--font-mono); font-size: 2rem; font-weight: 700; color: var(--accent); line-height: 1.2; }
.speedtest-unit { font-size: 0.75rem; color: var(--text-muted); }

.gauge-wrap { position: relative; max-width: 320px; margin: 0 auto 1.25rem; }
.gauge { width: 100%; display: block; }
.gauge-track { fill: none; stroke: var(--panel-border); stroke-width: 14; stroke-linecap: round; }
.gauge-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 14;
  stroke-linecap: round;
  stroke-dasharray: 251.33;
  stroke-dashoffset: 251.33;
  transition: stroke-dashoffset 0.3s ease, stroke 0.3s ease;
}
.gauge-center { position: absolute; left: 50%; bottom: 0.4rem; transform: translateX(-50%); text-align: center; }
.gauge-value { display: block; font-family: var(--font-mono); font-size: 2.1rem; font-weight: 700; color: var(--text); line-height: 1; }
.gauge-unit { display: block; font-size: 0.72rem; color: var(--text-muted); margin-top: 0.15rem; }
.gauge-phase { display: block; font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; margin-top: 0.3rem; }

.status-ok { color: var(--ok); font-weight: 600; }
.status-fail { color: var(--err); font-weight: 600; }

.visit-kind { display: inline-flex; padding: .22rem .5rem; border-radius: 999px; font-family: var(--font-ui); font-size: .68rem; font-weight: 750; white-space: nowrap; }
.visit-cloud { color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, transparent); }
.visit-person { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }

.kv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0.75rem; }
.kv {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  transition: border-color .15s ease, transform .15s ease;
}
.kv:hover { border-color: color-mix(in srgb, var(--accent) 35%, var(--panel-border)); transform: translateY(-1px); }
.kv .k { color: var(--text-muted); font-size: 0.8rem; }
.kv .v { font-weight: 600; font-size: 0.85rem; text-align: left; word-break: break-all; }
.kv .v.mono { font-family: var(--font-mono); font-weight: 500; }

.hint { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.5rem; }

.copy-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.copy-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--term-bg);
  color: var(--term-accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius);
}
.copy-list button { flex-shrink: 0; }

.pager { display: flex; align-items: center; gap: 1rem; margin-top: 1rem; font-size: 0.82rem; color: var(--text-muted); }

.foot {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 2rem 1rem 3rem;
}

@media (max-width: 640px) {
  .brand-sub, .theme-label { display: none; }
  .topbar { padding: .72rem 1rem; }
  .tabs { padding: .45rem 1rem; }
  main { padding: 1.2rem 1rem 2rem; }
  .hero { grid-template-columns: 1fr; gap: 1.4rem; padding: 1.5rem 0 1.8rem; }
  .hero h1 { font-size: 2.55rem; }
  .hero-protocols { grid-template-columns: 1fr 1fr; }
  .protocol-card { display: block; }
  .protocol-card small { display: block; margin-top: .25rem; overflow: hidden; text-overflow: ellipsis; }
  .panel-head { align-items: flex-start; }
  .tool-form { flex-direction: column; align-items: stretch; }
  .tool-form input, .tool-form select { min-width: 0; width: 100%; }
  .score-row { flex-direction: column; align-items: flex-start; }
  .score-list { columns: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}