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

:root {
  --bg: #0f1117; --surface: #1a1d27; --surface-2: #22252f; --text: #e2e4ed;
  --text-secondary: #8a8fa3; --text-muted: #5a5f73; --primary: #6c8aff;
  --success: #4ade80; --danger: #f87171; --warning: #fbbf24; --accent: #a78bfa;
  --border: #2a2d3a; --radius: 12px;
}

body { font-family: 'Inter', -apple-system, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; min-height: 100vh; }

/* Header */
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
  flex-wrap: wrap; gap: 8px;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.back-btn { color: var(--text-secondary); display: flex; align-items: center; padding: 6px; border-radius: 6px; transition: background 0.15s; }
.back-btn:hover { background: var(--surface-2); color: var(--text); }
header h1 { font-size: 1.1rem; font-weight: 700; }
.header-actions { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

.btn { padding: 7px 14px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2); color: var(--text); font-family: inherit; font-size: 0.8rem; cursor: pointer; transition: all 0.15s; }
.btn:hover { background: #2e313d; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.btn-primary:hover:not(:disabled) { background: #5a7aef; }

.upload-btn { display: inline-flex; align-items: center; padding: 7px 14px; border: 1px solid var(--primary); border-radius: 6px; background: rgba(108,138,255,0.1); color: var(--primary); font-size: 0.8rem; font-weight: 600; cursor: pointer; transition: background 0.15s; }
.upload-btn:hover { background: rgba(108,138,255,0.2); }

/* Drop zone */
.drop-zone { display: flex; align-items: center; justify-content: center; min-height: calc(100vh - 52px); padding: 2rem; }
.drop-zone-content { text-align: center; color: var(--text-secondary); }
.drop-zone-content svg { margin-bottom: 16px; opacity: 0.4; }
.drop-zone-content p { font-size: 1.1rem; margin-bottom: 6px; }
.drop-hint { font-size: 0.8rem; color: var(--text-muted); }
.drop-zone.drag-over { background: rgba(108,138,255,0.05); }

/* Results */
.results { padding: 16px; max-width: 1100px; margin: 0 auto; }
.hidden { display: none !important; }

/* Engine cards */
.engine-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }

.engine-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; transition: border-color 0.2s; position: relative; overflow: hidden;
  border-top: 3px solid var(--border);
}
.engine-card.running { border-top-color: var(--primary); }
.engine-card.done { border-top-color: var(--success); }
.engine-card.error { border-top-color: var(--danger); }

.engine-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.engine-name { font-weight: 700; font-size: 0.9rem; }
.engine-badge { font-size: 0.55rem; font-weight: 700; padding: 2px 6px; border-radius: 3px; text-transform: uppercase; letter-spacing: 0.05em; color: #fff; }
.badge-cpp { background: #e06c2d; }
.badge-java { background: #f97316; }
.badge-server { background: #0ea5e9; }
.badge-wasm { background: #8b5cf6; }

.engine-status { font-size: 0.8rem; color: var(--text-secondary); min-height: 20px; }
.engine-status.processing { color: var(--primary); }
.engine-status.complete { color: var(--success); }
.engine-status.error { color: var(--danger); }

.engine-metrics {
  margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--border);
  display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
}
.metric { text-align: center; }
.metric-value { font-size: 1.1rem; font-weight: 800; color: var(--text); }
.metric-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }

/* Performance chart */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 12px; }
.panel-title { font-size: 0.85rem; font-weight: 700; margin-bottom: 12px; }

.perf-chart { display: flex; flex-direction: column; gap: 8px; }
.perf-row { display: flex; align-items: center; gap: 10px; }
.perf-label { width: 100px; font-size: 0.8rem; font-weight: 600; text-align: right; flex-shrink: 0; }
.perf-bar-wrap { flex: 1; height: 28px; background: var(--surface-2); border-radius: 6px; overflow: hidden; position: relative; }
.perf-bar { height: 100%; border-radius: 6px; transition: width 0.6s ease; display: flex; align-items: center; justify-content: flex-end; padding-right: 8px; font-size: 0.75rem; font-weight: 700; color: #fff; min-width: 40px; }
.perf-bar.bar-cpp { background: linear-gradient(90deg, #e06c2d, #f59e0b); }
.perf-bar.bar-java { background: linear-gradient(90deg, #f97316, #fb923c); }
.perf-bar.bar-tess { background: linear-gradient(90deg, #0ea5e9, #38bdf8); }
.perf-bar.bar-wasm { background: linear-gradient(90deg, #8b5cf6, #a78bfa); }
.perf-bar.pending { background: var(--surface-2); width: 0 !important; }

/* Accuracy table */
.accuracy-table-wrap { overflow-x: auto; }
.accuracy-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.accuracy-table th { text-align: left; padding: 8px 10px; font-weight: 600; color: var(--text-secondary); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid var(--border); }
.accuracy-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); }
.accuracy-table tr:last-child td { border-bottom: none; }
.accuracy-table .engine-col { font-weight: 600; }

/* Text comparison */
.text-tabs { display: flex; gap: 4px; margin-bottom: 10px; flex-wrap: wrap; }
.text-tab { padding: 6px 14px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-2); color: var(--text-secondary); font-family: inherit; font-size: 0.78rem; font-weight: 600; cursor: pointer; transition: all 0.15s; }
.text-tab:hover { color: var(--text); }
.text-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.text-output {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem; line-height: 1.7; color: var(--text); white-space: pre-wrap;
  word-break: break-word; max-height: 400px; overflow-y: auto; min-height: 100px;
}

/* Responsive */
@media (max-width: 800px) {
  .engine-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
  .engine-grid { grid-template-columns: 1fr; }
  .perf-label { width: 70px; font-size: 0.7rem; }
}