:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #242836;
    --border: #2e3345;
    --text: #e8eaed;
    --text2: #9aa0b0;
    --accent: #e63946;
    --accent2: #ff6b6b;
    --green: #2ecc71;
    --yellow: #f1c40f;
    --blue: #3498db;
    --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

header {
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 16px 24px; display: flex; align-items: center;
    justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.logo { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 700; }
.logo-icon {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border-radius: 10px; display: flex; align-items: center; justify-content: center;
    font-size: 20px; color: white; font-weight: 800;
}
.nav-links { display: flex; gap: 4px; background: var(--surface2); border-radius: 8px; padding: 4px; }
.nav-links a, .nav-links button {
    padding: 8px 20px; border-radius: 6px; font-size: 14px; color: var(--text2);
    text-decoration: none; border: none; background: none; cursor: pointer; transition: all 0.2s;
}
.nav-links a.active, .nav-links button.active { background: var(--accent); color: white; }
.nav-links a:hover, .nav-links button:hover { color: white; }

main { max-width: 1400px; margin: 0 auto; padding: 24px; }

.steps { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.step-ind {
    display: flex; align-items: center; gap: 8px; padding: 10px 20px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 24px; font-size: 14px; color: var(--text2);
    cursor: pointer; transition: all 0.2s;
}
.step-ind.active { background: var(--accent); border-color: var(--accent); color: white; }
.step-ind.done { border-color: var(--green); color: var(--green); }
.step-num {
    width: 24px; height: 24px; border-radius: 50%; background: var(--surface2);
    display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700;
}
.step-ind.active .step-num { background: rgba(255,255,255,0.2); color: white; }
.step-ind.done .step-num { background: var(--green); color: white; }

.panel { display: none; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.panel.active { display: block; }
h2 { font-size: 18px; margin-bottom: 16px; }

.upload-zone {
    border: 2px dashed var(--border); border-radius: var(--radius); padding: 40px 20px;
    text-align: center; cursor: pointer; transition: all 0.2s; position: relative;
}
.upload-zone:hover { border-color: var(--accent); background: rgba(230,57,70,0.05); }
.upload-zone.has-files { border-color: var(--green); border-style: solid; padding: 16px; }
.upload-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.upload-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.5; }
.upload-label { font-size: 16px; margin-bottom: 4px; }
.upload-hint { font-size: 13px; color: var(--text2); }
.preview-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.preview-grid img { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; border: 2px solid var(--border); }

.car-info { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-bottom: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 4px; }
input[type="text"], input[type="number"], textarea {
    width: 100%; background: var(--surface2); border: 1px solid var(--border);
    color: var(--text); padding: 10px 12px; border-radius: 8px; font-size: 14px; font-family: inherit;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { min-height: 80px; resize: vertical; }

.btn {
    padding: 12px 24px; border: none; border-radius: 8px; font-size: 15px; font-weight: 600;
    cursor: pointer; transition: all 0.2s; display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent2); }
.btn-primary:disabled { background: var(--surface2); color: var(--text2); cursor: not-allowed; }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); }
.btn-success { background: var(--green); color: white; }
.btn-danger { background: var(--accent); color: white; font-size: 13px; padding: 8px 14px; }
.actions { display: flex; justify-content: space-between; margin-top: 20px; }

.formula-table { width: 100%; border-collapse: collapse; margin-top: 12px; }
.formula-table th { background: var(--surface2); padding: 10px 12px; text-align: left; font-size: 13px; color: var(--text2); font-weight: 600; }
.formula-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; }
.formula-table td[contenteditable]:focus { background: rgba(230,57,70,0.1); outline: 1px solid var(--accent); border-radius: 4px; }

.result-card { background: var(--surface2); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.severity-badge { display: inline-block; padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 700; text-transform: uppercase; }
.severity-slight { background: rgba(46,204,113,0.2); color: var(--green); }
.severity-moderate { background: rgba(241,196,15,0.2); color: var(--yellow); }
.severity-significant { background: rgba(230,57,70,0.2); color: var(--accent2); }
.severity-unknown { background: rgba(255,255,255,0.1); color: var(--text2); }

.adjustment-row {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr 2fr;
    gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border); align-items: center;
}
.adjustment-row:last-child { border-bottom: none; }
.adj-header { font-size: 12px; color: var(--text2); font-weight: 600; text-transform: uppercase; }
.adj-action { padding: 4px 10px; border-radius: 6px; font-size: 13px; font-weight: 600; }
.adj-increase { background: rgba(46,204,113,0.15); color: var(--green); }
.adj-decrease { background: rgba(230,57,70,0.15); color: var(--accent2); }

.comparison-images { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 20px; }
.comparison-images img { width: 100%; height: 200px; object-fit: cover; border-radius: 8px; border: 2px solid var(--border); }
.img-label { font-size: 12px; color: var(--text2); text-align: center; margin-top: 6px; }

.confidence-bar { height: 8px; background: var(--surface); border-radius: 4px; overflow: hidden; margin-top: 8px; }
.confidence-fill { height: 100%; border-radius: 4px; transition: width 0.5s; }

.mode-tabs { display: flex; gap: 4px; margin-bottom: 16px; background: var(--surface2); border-radius: 8px; padding: 4px; width: fit-content; }
.mode-tab { padding: 8px 20px; border-radius: 6px; font-size: 14px; cursor: pointer; color: var(--text2); border: none; background: none; }
.mode-tab.active { background: var(--accent); color: white; }

.manual-row { display: grid; grid-template-columns: 3fr 1fr 1fr auto; gap: 8px; margin-bottom: 8px; align-items: center; }
.manual-row input { padding: 8px 10px; }
.remove-btn { background: var(--accent); color: white; border: none; width: 32px; height: 32px; border-radius: 6px; cursor: pointer; font-size: 16px; }

.loading { display: none; text-align: center; padding: 40px; }
.loading.active { display: block; }
.spinner { width: 48px; height: 48px; border: 4px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 16px; }
@keyframes spin { to { transform: rotate(360deg); } }

.history-item {
    background: var(--surface2); border-radius: 8px; padding: 16px; margin-bottom: 8px;
    display: flex; justify-content: space-between; align-items: center;
    border: 1px solid var(--border); transition: all 0.2s;
}
.history-item:hover { border-color: var(--accent); }

@media (max-width: 768px) {
    .grid-2, .car-info { grid-template-columns: 1fr; }
    .adjustment-row { grid-template-columns: 1fr 1fr; gap: 6px; font-size: 13px; }
    .comparison-images { grid-template-columns: 1fr; }
    .steps { gap: 4px; }
    .step-ind { padding: 8px 12px; font-size: 12px; }
    header { padding: 12px 16px; }
    main { padding: 16px; }
}