:root {
  --bg: #080c10;
  --surface: #0e1520;
  --border: #1e2d3d;
  --accent: #00d4ff;
  --accent2: #ff6b35;
  --accent3: #39ff14;
  --warn: #ffcc00;
  --danger: #ff4444;
  --text: #d0dae8;
  --muted: #5a6a80;
  --glow: 0 0 20px rgba(0,212,255,0.35);
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
}
body::before {
  content:'';
  position:fixed; inset:0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size:50px 50px;
  pointer-events:none; z-index:0;
}
.wrapper {
  position:relative; z-index:1;
  max-width:960px; margin:0 auto;
  padding:48px 24px 80px;
}

/* Header */
header { text-align:center; margin-bottom:52px; }
.logo {
  font-family:'Space Mono',monospace;
  font-size:13px; letter-spacing:7px;
  color:var(--accent); opacity:.7;
  margin-bottom:14px;
}
h1 {
  font-family:'Space Mono',monospace;
  font-size:clamp(40px,7vw,68px);
  font-weight:700; color:#fff;
  letter-spacing:-2px; line-height:1;
}
h1 span { color:var(--accent); text-shadow:var(--glow); }
.subtitle {
  margin-top:16px;
  font-size:17px; color:var(--muted);
  font-weight:300;
}

/* Gauge */
.gauge-section { display:flex; justify-content:center; margin-bottom:44px; }
.gauge-wrap { position:relative; width:240px; height:240px; }
.gauge-svg { width:100%; height:100%; transform:rotate(-135deg); }
.gauge-bg { fill:none; stroke:var(--border); stroke-width:10; stroke-linecap:round; }
.gauge-fill {
  fill:none; stroke:var(--accent); stroke-width:10; stroke-linecap:round;
  stroke-dasharray:565; stroke-dashoffset:565;
  transition:stroke-dashoffset .5s ease, stroke .4s;
  filter:drop-shadow(0 0 10px var(--accent));
}
.gauge-center {
  position:absolute; inset:0;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
}
.gauge-value {
  font-family:'Space Mono',monospace;
  font-size:46px; font-weight:700; color:#fff; line-height:1;
}
.gauge-unit { font-family:'Space Mono',monospace; font-size:13px; color:var(--accent); letter-spacing:2px; margin-top:5px; }
.gauge-label { font-size:13px; color:var(--muted); margin-top:4px; }

/* Start button */
.start-btn {
  display:block; margin:0 auto 52px;
  width:200px; height:56px;
  background:transparent; border:2px solid var(--accent);
  color:var(--accent);
  font-family:'Space Mono',monospace; font-size:15px;
  letter-spacing:3px; cursor:pointer; text-transform:uppercase;
  position:relative; overflow:hidden; transition:all .3s;
  clip-path:polygon(10px 0%,100% 0%,calc(100% - 10px) 100%,0% 100%);
}
.start-btn::before {
  content:''; position:absolute; inset:0;
  background:var(--accent); transform:scaleX(0);
  transform-origin:left; transition:transform .3s; z-index:-1;
}
.start-btn:hover::before { transform:scaleX(1); }
.start-btn:hover { color:#000; font-weight:700; }
.start-btn:disabled { opacity:.35; cursor:not-allowed; }
.start-btn:disabled:hover { color:var(--accent); }
.start-btn:disabled:hover::before { transform:none; }

/* Status */
.status-bar {
  background:var(--surface); border:1px solid var(--border);
  border-left:4px solid var(--accent);
  padding:18px 24px; margin-bottom:28px;
  font-family:'Space Mono',monospace; font-size:15px;
  color:var(--accent); display:flex; align-items:center; gap:14px;
  min-height:58px;
}
.status-dot {
  width:11px; height:11px; border-radius:50%;
  background:var(--muted); flex-shrink:0; transition:background .3s;
}
.status-dot.running { background:var(--accent); box-shadow:0 0 10px var(--accent); animation:blink 1s infinite; }
.status-dot.done { background:var(--accent3); box-shadow:0 0 10px var(--accent3); }
.status-dot.error { background:var(--danger); }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.15} }

/* Progress */
.progress-wrap {
  background:var(--surface); border:1px solid var(--border);
  padding:22px 28px; margin-bottom:28px; display:none;
}
.progress-header {
  display:flex; justify-content:space-between;
  margin-bottom:14px;
  font-family:'Space Mono',monospace; font-size:14px; color:var(--muted);
}
.progress-bar-bg { background:var(--border); height:5px; overflow:hidden; }
.progress-bar-fill {
  height:100%; background:var(--accent); width:0%;
  transition:width .5s ease; box-shadow:0 0 10px var(--accent);
}

/* Cards */
.cards { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; margin-bottom:28px; }
@media(max-width:680px) { .cards { grid-template-columns:1fr 1fr; } }
@media(max-width:400px) { .cards { grid-template-columns:1fr; } }

.card {
  background:var(--surface); border:1px solid var(--border);
  padding:26px 22px; position:relative; overflow:hidden;
  transition:border-color .3s;
}
.card::before {
  content:''; position:absolute;
  top:0; left:0; right:0; height:3px;
  background:var(--accent); transform:scaleX(0);
  transform-origin:left; transition:transform .5s;
}
.card.active::before { transform:scaleX(1); }
.card.active { border-color:rgba(0,212,255,.3); }
.card.done::before { background:var(--accent3); transform:scaleX(1); }
.card.warn::before { background:var(--warn); transform:scaleX(1); }
.card.bad::before { background:var(--danger); transform:scaleX(1); }

.card-icon { font-size:26px; margin-bottom:14px; display:block; }
.card-label {
  font-size:12px; letter-spacing:2px; color:var(--muted);
  text-transform:uppercase; font-family:'Space Mono',monospace; margin-bottom:12px;
}
.card-value {
  font-family:'Space Mono',monospace;
  font-size:34px; font-weight:700; color:#fff; line-height:1;
  transition:color .3s; word-break:break-all;
}
.card-sub { font-size:14px; color:var(--muted); margin-top:10px; font-family:'Space Mono',monospace; }
.card.done .card-value { color:var(--accent3); text-shadow:0 0 12px rgba(57,255,20,.4); }
.card.warn .card-value { color:var(--warn); }
.card.bad .card-value { color:var(--danger); font-size:22px; }

/* Chart */
.chart-section {
  background:var(--surface); border:1px solid var(--border);
  padding:26px; margin-bottom:28px;
}
.chart-title {
  font-family:'Space Mono',monospace; font-size:13px;
  letter-spacing:2px; color:var(--muted); text-transform:uppercase;
  margin-bottom:18px; display:flex; align-items:center; gap:10px;
}
.chart-title::after { content:''; flex:1; height:1px; background:var(--border); }
.ping-chart { display:flex; align-items:flex-end; gap:4px; height:100px; }
.ping-bar {
  flex:1; background:rgba(0,212,255,.15); border-top:2px solid var(--accent);
  min-height:3px; transition:height .3s;
}
.ping-bar.warn { background:rgba(255,204,0,.15); border-color:var(--warn); }
.ping-bar.bad { background:rgba(255,68,68,.15); border-color:var(--danger); }
.ping-bar.lost { background:rgba(255,68,68,.3); border-color:var(--danger); border-style:dashed; }
.chart-legend {
  display:flex; flex-wrap:wrap; gap:16px; margin-top:14px;
  font-size:13px; color:var(--muted);
}
.ld { display:inline-block; width:10px; height:10px; border-radius:50%; margin-right:5px; vertical-align:middle; }

/* Error note */
.error-note {
  display:none;
  background:rgba(255,68,68,.07); border:1px solid rgba(255,68,68,.3);
  border-left:4px solid var(--danger);
  padding:18px 22px; margin-bottom:24px;
  font-size:15px; color:#ff9999; line-height:1.8;
}
.error-note.show { display:block; }
.error-note strong { color:#ffbbbb; }

/* Result Popup */
.modal-overlay {
  position:fixed; inset:0; z-index:999;
  background:rgba(0,0,0,0.6); backdrop-filter:blur(8px);
  display:none; align-items:center; justify-content:center;
  opacity:0; transition:opacity .4s;
}
.modal-overlay.show { display:flex; opacity:1; }

.modal-overlay canvas {
  position:absolute; inset:0; pointer-events:none; z-index:0;
}

.result-box {
  background:var(--surface); border:1px solid var(--border);
  padding:40px; text-align:center;
  max-width:600px; width:90%;
  position:relative; z-index:1;
  box-shadow:0 10px 40px rgba(0,0,0,0.5);
  transform:translateY(30px); transition:transform .4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}
.modal-overlay.show .result-box { transform:translateY(0); }

.close-btn {
  position:absolute; top:16px; right:16px;
  background:none; border:none; color:var(--muted);
  font-size:32px; cursor:pointer; line-height:1;
  transition:color .3s;
}
.close-btn:hover { color:#fff; }

.result-grade {
  font-family:'Space Mono',monospace;
  font-size:clamp(40px, 8vw, 60px); font-weight:700; line-height:1.2; margin-bottom:14px;
}
.result-grade.A { color:var(--accent3); text-shadow:0 0 30px rgba(57,255,20,.5); }
.result-grade.B { color:var(--accent); text-shadow:var(--glow); }
.result-grade.C { color:var(--warn); }
.result-grade.D, .result-grade.F { color:var(--danger); }
.result-desc { font-size:18px; color:var(--muted); margin-bottom:30px; line-height:1.8; }
.result-tips {
  text-align:left; font-size:16px; color:var(--text); line-height:2.1;
  background:rgba(0,212,255,.04); border:1px solid var(--border);
  padding:22px 28px;
}
.result-tips li { margin-left:20px; margin-bottom:6px; }

/* ── Added for AdSense Compliance ── */

/* Top Navigation */
.top-nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 0 40px; border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}
.nav-logo {
  font-family: 'Space Mono', monospace; font-weight: 700;
  color: var(--accent); letter-spacing: 1px;
}
.nav-menu {
  list-style: none; display: flex; gap: 24px;
}
.nav-menu a {
  text-decoration: none; color: var(--muted); font-size: 14px;
  transition: color .3s;
}
.nav-menu a:hover, .nav-menu a.active { color: #fff; }

/* Rich Content Section */
.content-section {
  margin-top: 60px; padding-top: 40px;
  border-top: 1px solid var(--border);
}
.content-section h2 {
  font-size: 24px; color: #fff; margin-bottom: 20px;
}
.content-section p {
  line-height: 1.8; color: var(--text); margin-bottom: 24px;
}
.info-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  margin-top: 30px;
}
@media(max-width: 768px) { .info-grid { grid-template-columns: 1fr; } }

.info-item {
  background: var(--surface); border: 1px solid var(--border);
  padding: 24px; border-radius: 8px;
}
.info-item h3 {
  font-size: 16px; color: var(--accent); margin-bottom: 12px;
}
.info-item p {
  font-size: 14px; color: var(--muted); margin: 0;
}

/* FAQ */
details {
  background: var(--surface); border: 1px solid var(--border);
  margin-bottom: 10px; border-radius: 4px; overflow: hidden;
}
summary {
  padding: 18px 24px; cursor: pointer; font-weight: 700; color: #fff;
  list-style: none; position: relative;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: '+'; position: absolute; right: 24px; color: var(--accent);
}
details[open] summary::after { content: '-'; }
details p {
  padding: 0 24px 24px; margin: 0; color: var(--muted); font-size: 15px;
  border-top: 1px solid var(--border); padding-top: 16px;
}

/* Footer */
footer {
  margin-top: 80px; padding-top: 40px; border-top: 1px solid var(--border);
  text-align: center; color: var(--muted); font-size: 13px;
}
.footer-links {
  margin-bottom: 16px;
}
.footer-links a {
  color: var(--text); text-decoration: none; margin: 0 10px;
}
.footer-links a:hover { text-decoration: underline; }
.disclaimer {
  margin-top: 12px; opacity: 0.6; font-size: 12px;
}

/* ── History Table (Added) ── */
.history-section {
  background: var(--surface); border: 1px solid var(--border);
  padding: 30px; margin-bottom: 28px;
}
.history-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px;
}
.history-header h2 {
  font-size: 20px; color: #fff; display: flex; align-items: center; gap: 8px;
}
.clear-btn {
  background: transparent; border: 1px solid var(--border);
  color: var(--muted); padding: 8px 16px; font-family: 'Space Mono', monospace;
  cursor: pointer; transition: all .3s; font-size: 13px;
}
.clear-btn:hover { background: rgba(255,68,68,.1); color: var(--danger); border-color: var(--danger); }

.table-wrap { overflow-x: auto; }
.history-table {
  width: 100%; border-collapse: collapse; min-width: 600px;
}
.history-table th {
  text-align: left; padding: 12px 16px; border-bottom: 2px solid var(--border);
  color: var(--muted); font-size: 13px; font-weight: 400; text-transform: uppercase;
  font-family: 'Space Mono', monospace;
}
.history-table td {
  padding: 16px; border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 14px; color: var(--text); font-family: 'Space Mono', monospace;
}
.history-table tr:last-child td { border-bottom: none; }
.history-table tr:hover { background: rgba(255,255,255,0.02); }

.badge-grade {
  display: inline-block; width: 24px; height: 24px; line-height: 24px;
  text-align: center; border-radius: 4px; font-weight: 700; font-size: 14px;
}
.badge-grade.A { background: rgba(57,255,20,.15); color: var(--accent3); }
.badge-grade.B { background: rgba(0,212,255,.15); color: var(--accent); }
.badge-grade.C { background: rgba(255,204,0,.15); color: var(--warn); }
.badge-grade.D, .badge-grade.F { background: rgba(255,68,68,.15); color: var(--danger); }