:root {
  --bg-dark: #0f1117;
  --bg-card: #1a1d27;
  --bg-input: #252836;
  --border: #2d3141;
  --text-primary: #e4e6f0;
  --text-secondary: #8b8fa3;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --green: #22c55e;
  --green-bg: rgba(34,197,94,.12);
  --yellow: #eab308;
  --yellow-bg: rgba(234,179,8,.12);
  --red: #ef4444;
  --red-bg: rgba(239,68,68,.12);
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.3);
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }

/* ── Header ── */
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 32px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index:100;
}
.header-left { display:flex; align-items:center; gap:14px; }
.logo-icon { width:36px; height:36px; border-radius:8px; background:var(--accent); display:flex;align-items:center;justify-content:center;font-size:18px; }
.logo-text { font-size:1.25rem; font-weight:700; }
.logo-text span { color:var(--accent); }
.header-right { display:flex; align-items:center; gap:12px; }

/* ── Buttons ── */
.btn {
  padding: 9px 18px; border:none; border-radius:8px; cursor:pointer;
  font-size:.875rem; font-weight:600; transition:all .2s;
  display:inline-flex; align-items:center; gap:6px; color:#fff;
}
.btn-accent { background:var(--accent); }
.btn-accent:hover { background:var(--accent-hover); transform:translateY(-1px); }
.btn-danger { background:var(--red); }
.btn-danger:hover { background:#dc2626; }
.btn-success { background:var(--green); }
.btn-yellow { background:var(--yellow); color:#000; }
.btn-ghost { background:transparent; border:1px solid var(--border); color:var(--text-secondary); }
.btn-ghost:hover { border-color:var(--accent); color:var(--accent); }
.btn-sm { padding:6px 12px; font-size:.8rem; }

/* ── Search ── */
.search-box {
  padding: 9px 14px; background:var(--bg-input); border:1px solid var(--border);
  border-radius:8px; color:var(--text-primary); font-size:.875rem; width:240px;
  outline:none; transition:border .2s;
}
.search-box:focus { border-color:var(--accent); }
.search-box::placeholder { color:var(--text-secondary); }

/* ── Container ── */
.container { max-width:1440px; margin:0 auto; padding:24px 32px; }

/* ── Stats bar ── */
.stats-bar {
  display:flex; gap:16px; margin-bottom:24px; flex-wrap:wrap;
}
.stat-box {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:16px 24px; flex:1; min-width:150px;
}
.stat-box .label { font-size:.75rem; color:var(--text-secondary); text-transform:uppercase; letter-spacing:.5px; }
.stat-box .value { font-size:1.75rem; font-weight:700; margin-top:4px; }
.stat-box .value.up { color:var(--green); }
.stat-box .value.down { color:var(--red); }
.stat-box .value.slow { color:var(--yellow); }

/* ── Sites grid ── */
.sites-grid {
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
  gap:20px;
}

/* ── Site card ── */
.site-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:24px; transition:all .3s;
  position:relative; overflow:hidden;
}
.site-card:hover { border-color:var(--accent); box-shadow:var(--shadow); }
.site-card.status-down { border-color:var(--red); }
.site-card.status-slow { border-color:var(--yellow); }
.site-card.status-up { border-left: 3px solid var(--green); }

.card-top { display:flex; justify-content:space-between; align-items:start; margin-bottom:16px; }
.card-info h3 { font-size:1.1rem; font-weight:600; margin-bottom:4px; display:flex;align-items:center;gap:8px; }
.card-url { color:var(--text-secondary); font-size:.8rem; word-break:break-all; }
.card-last-check { color:var(--text-secondary); font-size:.75rem; margin-top:4px; }

.status-badge {
  padding:5px 14px; border-radius:20px; font-size:.75rem; font-weight:700;
  text-transform:uppercase; letter-spacing:.5px; white-space:nowrap;
}
.badge-up { background:var(--green-bg); color:var(--green); }
.badge-down { background:var(--red-bg); color:var(--red); animation:pulse-badge 1.5s infinite; }
.badge-slow { background:var(--yellow-bg); color:var(--yellow); }
.badge-unknown { background:rgba(139,143,163,.12); color:var(--text-secondary); }

@keyframes pulse-badge { 0%,100%{opacity:1;} 50%{opacity:.5;} }

.card-stats {
  display:grid; grid-template-columns:repeat(3,1fr); gap:12px;
  padding:14px; background:var(--bg-input); border-radius:8px; margin:16px 0;
}
.card-stat { text-align:center; }
.card-stat-value { font-size:1.2rem; font-weight:700; color:var(--accent); }
.card-stat-label { font-size:.7rem; color:var(--text-secondary); margin-top:2px; text-transform:uppercase; }

.chart-box { height:160px; margin:16px 0; }
.chart-box canvas { max-height:100%; }

.card-actions { display:flex; gap:8px; flex-wrap:wrap; }
.card-actions .btn { flex:1; min-width:80px; justify-content:center; }

/* ── Diagnosis panel ── */
.diagnosis-panel {
  margin-top:16px; padding:16px; background:var(--red-bg);
  border:1px solid rgba(239,68,68,.3); border-radius:8px;
}
.diagnosis-panel h4 { color:var(--red); margin-bottom:8px; display:flex;align-items:center;gap:6px; }
.diagnosis-panel .diag-text { font-size:.85rem; color:var(--text-primary); margin-bottom:6px; line-height:1.5; }
.diagnosis-panel .diag-fix { font-size:.85rem; color:var(--green); margin-bottom:12px; }
.diagnosis-panel .diag-severity {
  display:inline-block; padding:2px 8px; border-radius:4px; font-size:.7rem;
  font-weight:700; text-transform:uppercase; margin-bottom:8px;
}
.severity-critical { background:var(--red); color:#fff; }
.severity-high { background:#f97316; color:#fff; }
.severity-medium { background:var(--yellow); color:#000; }
.severity-low { background:var(--green); color:#fff; }

/* ── Agent Log ── */
.agent-log { max-height:400px; overflow-y:auto; margin-top:8px; font-size:.75rem; font-family:'Fira Code',monospace; }
.agent-step { padding:3px 0; border-bottom:1px solid rgba(45,49,65,.5); line-height:1.4; }
.agent-tool { color:var(--accent); font-weight:600; }
.agent-input { color:var(--text-secondary); word-break:break-all; }
.agent-result { color:var(--text-secondary); padding-left:16px; font-style:italic; }
.agent-think { color:var(--yellow); }
.agent-done { color:var(--green); font-weight:600; }

/* ── Modal ── */
.modal-overlay {
  display:none; position:fixed; top:0; left:0; width:100%; height:100%;
  background:rgba(0,0,0,.7); z-index:200; align-items:center; justify-content:center;
}
.modal-overlay.active { display:flex; }
.modal {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:32px; max-width:540px; width:92%;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.modal h2 { font-size:1.2rem; margin-bottom:20px; color:var(--accent); }
.form-group { margin-bottom:16px; }
.form-group label { display:block; margin-bottom:6px; font-size:.85rem; font-weight:500; color:var(--text-secondary); }
.form-group input, .form-group select {
  width:100%; padding:10px 14px; background:var(--bg-input);
  border:1px solid var(--border); border-radius:8px; color:var(--text-primary);
  font-size:.875rem; outline:none; transition:border .2s;
}
.form-group input:focus, .form-group select:focus { border-color:var(--accent); }
.form-group small { color:var(--text-secondary); font-size:.75rem; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.form-actions { display:flex; gap:10px; justify-content:flex-end; margin-top:24px; }

/* ── Empty state ── */
.empty-state {
  text-align:center; padding:80px 20px; background:var(--bg-card);
  border:1px solid var(--border); border-radius:var(--radius);
}
.empty-state h2 { color:var(--accent); margin-bottom:12px; }
.empty-state p { color:var(--text-secondary); margin-bottom:24px; }

/* ── Loading ── */
.loading { text-align:center; padding:60px; color:var(--text-secondary); font-size:1.1rem; }
.spinner { display:inline-block; width:24px; height:24px; border:3px solid var(--border); border-top-color:var(--accent); border-radius:50%; animation:spin .6s linear infinite; }
@keyframes spin { to { transform:rotate(360deg); } }

/* ── Toast ── */
.toast {
  position:fixed; bottom:24px; right:24px; padding:14px 20px; border-radius:8px;
  font-size:.875rem; font-weight:500; z-index:300; transform:translateY(100px);
  opacity:0; transition:all .3s ease;
}
.toast.show { transform:translateY(0); opacity:1; }
.toast-success { background:var(--green); color:#fff; }
.toast-error { background:var(--red); color:#fff; }
.toast-info { background:var(--accent); color:#fff; }

/* ── Responsive ── */
@media (max-width:768px) {
  .header { padding:14px 16px; flex-direction:column; gap:12px; }
  .search-box { width:100%; }
  .container { padding:16px; }
  .sites-grid { grid-template-columns:1fr; }
  .stats-bar { flex-direction:column; }
  .form-row { grid-template-columns:1fr; }
}