/* ═══════════════════════════════════════════════════════════════
 *  FaceScan AI — Glassmorphism Dark UI
 * ═══════════════════════════════════════════════════════════════ */

/* ─── Reset & Variables ───────────────────────────────────── */

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

:root {
    --bg-dark: #0a0a1a;
    --bg-gradient: linear-gradient(135deg, #0a0a1a 0%, #1a1a3e 50%, #0a0a1a 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --glass-inner-bg: rgba(255, 255, 255, 0.03);
    --text-primary: #e0e0e0;
    --text-secondary: #9090a0;
    --text-muted: #606070;
    --accent: #6C63FF;
    --accent-glow: rgba(108, 99, 255, 0.3);
    --success: #4ECDC4;
    --danger: #FF6B6B;
    --warning: #FFE66D;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    background-image: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ─── Glassmorphism Base ──────────────────────────────────── */

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
}

.glass-inner {
    background: var(--glass-inner-bg);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-sm);
}

/* ─── Header ──────────────────────────────────────────────── */

.header {
    text-align: center;
    padding: 2rem 1rem 1rem;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-ai {
    background: linear-gradient(135deg, var(--accent), #00D2FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* ─── Main Layout ─────────────────────────────────────────── */

.main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 1.5rem auto;
    padding: 0 1.5rem;
}

@media (max-width: 900px) {
    .main {
        grid-template-columns: 1fr;
    }
}

.panel {
    padding: 1.5rem;
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

.panel-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* ─── Camera ──────────────────────────────────────────────── */

.camera-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16/10;
    background: #000;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 1rem;
}

#cameraPreview {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
    transform: scaleX(-1); /* Mirror for selfie */
}

#faceDetectionCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    transform: scaleX(-1); /* Mirror for selfie */
    z-index: 10;
}

.camera-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.camera-overlay {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.face-guide {
    width: 200px;
    height: 260px;
    border: 2px dashed rgba(108, 99, 255, 0.5);
    border-radius: 50%;
    animation: pulse-guide 2s infinite;
}

@keyframes pulse-guide {
    0%, 100% { border-color: rgba(108, 99, 255, 0.3); }
    50%      { border-color: rgba(108, 99, 255, 0.7); }
}

.camera-overlay p {
    margin-top: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
}

/* ─── Camera Controls ─────────────────────────────────────── */

.camera-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.camera-controls .btn {
    flex: 1;
}

/* ─── Buttons ─────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 1rem;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary {
    background: rgba(108, 99, 255, 0.2);
    border-color: rgba(108, 99, 255, 0.4);
}

.btn-primary:hover:not(:disabled) {
    background: rgba(108, 99, 255, 0.35);
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-success {
    background: rgba(78, 205, 196, 0.2);
    border-color: rgba(78, 205, 196, 0.4);
}

.btn-success:hover:not(:disabled) {
    background: rgba(78, 205, 196, 0.35);
    box-shadow: 0 0 20px rgba(78, 205, 196, 0.3);
}

.btn-danger {
    background: rgba(255, 107, 107, 0.2);
    border-color: rgba(255, 107, 107, 0.4);
}

.btn-danger:hover:not(:disabled) {
    background: rgba(255, 107, 107, 0.35);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
}

.btn-icon {
    font-size: 1rem;
}

/* ─── Divider ─────────────────────────────────────────────── */

.divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 0.75rem 0;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.divider::before, .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--glass-border);
}

/* ─── Drop Zone ───────────────────────────────────────────── */

.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    min-height: 120px;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(108, 99, 255, 0.05);
}

.drop-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.drop-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.drop-subtext {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ─── Preview ─────────────────────────────────────────────── */

.preview-container {
    margin-top: 1rem;
    text-align: center;
}

#previewImage {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
}

.preview-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 0.75rem;
}

/* ─── Results Panel States ────────────────────────────────── */

.loading, .empty-state, .error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    color: var(--text-secondary);
    text-align: center;
    gap: 1rem;
}

.empty-icon, .error-icon {
    font-size: 3rem;
    opacity: 0.5;
}

.error-state {
    color: var(--danger);
}

.error-state p {
    max-width: 300px;
    word-wrap: break-word;
}

/* ─── Spinner ─────────────────────────────────────────────── */

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(108, 99, 255, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ─── Confidence Badge ────────────────────────────────────── */

.confidence-badge {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    background: var(--glass-inner-bg);
    border: 1px solid var(--glass-border);
}

.confidence-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.confidence-value {
    font-weight: 700;
}

.confidence-high .confidence-value {
    color: var(--success);
}

.confidence-medium .confidence-value {
    color: var(--warning);
}

.confidence-low .confidence-value {
    color: var(--danger);
}

/* ─── Measurement Cards ───────────────────────────────────── */

.measurement-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

@media (max-width: 600px) {
    .measurement-grid {
        grid-template-columns: 1fr;
    }
}

.measurement-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem;
    transition: var(--transition);
}

.measurement-card:hover {
    background: rgba(255, 255, 255, 0.06);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 1.5rem;
    width: 2.2rem;
    text-align: center;
    flex-shrink: 0;
}

.card-body {
    flex: 1;
    min-width: 0;
}

.card-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.15rem;
}

.card-value {
    display: flex;
    align-items: baseline;
    gap: 0.3rem;
}

.value-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.value-unit {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ─── Metadata ────────────────────────────────────────────── */

#metadataSection {
    padding: 1rem;
}

#metadataSection h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.75rem;
}

.metadata-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.meta-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    padding: 0.3rem 0;
}

.meta-label {
    color: var(--text-muted);
}

.meta-value {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ─── Footer ──────────────────────────────────────────────── */

.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ─── Scrollbar ───────────────────────────────────────────── */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}