:root {
  --bg-primary:   #0d0d1a;
  --bg-secondary: #1a1a2e;
  --bg-card:      #16213e;
  --bg-accent:    #0f3460;
  --blue:         #1e90ff;
  --green:        #4caf50;
  --red:          #f44336;
  --yellow:       #ffc107;
  --text:         #e8e8e8;
  --text-muted:   #888;
  --border:       #2a2a4a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg-primary); color: var(--text);
       font-family: 'Segoe UI', Arial, sans-serif; }
.navbar { display: flex; justify-content: space-between; align-items: center;
          padding: 0.8rem 2rem; background: var(--bg-secondary);
          border-bottom: 1px solid var(--border); }
.nav-brand { display: flex; align-items: center; gap: 0.5rem;
             font-size: 1.1rem; font-weight: 700; color: var(--blue); }
.nav-links a { color: var(--text-muted); text-decoration: none;
               margin-left: 1.5rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--blue); }
.main-content { padding: 2rem; max-width: 1400px; margin: 0 auto; }
.card { background: var(--bg-card); border: 1px solid var(--border);
        border-radius: 8px; padding: 1.5rem; margin-bottom: 1.5rem; }
.card-title { color: var(--blue); font-size: 1.1rem; font-weight: 600;
              margin-bottom: 1rem; border-bottom: 1px solid var(--border);
              padding-bottom: 0.5rem; }
.badge { display: inline-block; padding: 0.25rem 0.7rem; border-radius: 12px;
         font-size: 0.8rem; font-weight: 600; }
.badge-pass   { background: #1a3a1a; color: var(--green); }
.badge-fail   { background: #3a1a1a; color: var(--red); }
.badge-unknown { background: #2a2a1a; color: var(--yellow); }
.btn { padding: 0.5rem 1.2rem; border: none; border-radius: 6px; cursor: pointer;
       font-size: 0.9rem; font-weight: 600; transition: all 0.2s; }
.btn-primary { background: var(--blue); color: white; }
.btn-primary:hover { background: #1a7fe0; }
.btn-danger  { background: #3a1a1a; color: var(--red); border: 1px solid var(--red); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.stat-card { background: var(--bg-secondary); border: 1px solid var(--border);
             border-radius: 8px; padding: 1.2rem; text-align: center; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--blue); }
.stat-label { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.3rem; }
table { width: 100%; border-collapse: collapse; }
th { background: var(--bg-accent); color: var(--blue); padding: 0.7rem 1rem;
     text-align: left; font-size: 0.85rem; text-transform: uppercase; }
td { padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
tr:hover td { background: var(--bg-secondary); }
.upload-zone { border: 2px dashed var(--border); border-radius: 8px;
               padding: 3rem; text-align: center; cursor: pointer;
               transition: border-color 0.2s; }
.upload-zone:hover, .upload-zone.drag-over { border-color: var(--blue); }
#trace-chart { width: 100%; height: 450px; }
#span-map { width: 100%; height: 400px; border-radius: 8px; }
.input-group { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 1rem; }
.input-group label { color: var(--text-muted); font-size: 0.85rem; }
.input-group input, .input-group select {
  background: var(--bg-secondary); border: 1px solid var(--border);
  color: var(--text); padding: 0.5rem 0.8rem; border-radius: 6px; font-size: 0.9rem; }
.result-box { background: var(--bg-secondary); border-left: 4px solid var(--blue);
              padding: 1rem; border-radius: 0 8px 8px 0; margin-top: 1rem; }