/* Base - Light theme (default) */
:root, html[data-theme="light"] {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --bg: #f9fafb;
    --bg-card: #ffffff;
    --bg-header: #ffffff;
    --bg-elev: #f3f4f6;
    --border: #e5e7eb;
    --text: #111827;
    --text-primary: #111827;
    --text-secondary: #6b7280;
}

/* Dark theme: system preference OR explicit toggle */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #3b82f6;
        --primary-hover: #2563eb;
        --success: #22c55e;
        --warning: #f59e0b;
        --danger: #ef4444;
        --gray-50: #1f2937;
        --gray-100: #283344;
        --gray-200: #374151;
        --gray-300: #4b5563;
        --gray-500: #9ca3af;
        --gray-700: #d1d5db;
        --gray-900: #f9fafb;
        --bg: #111827;
        --bg-card: #1f2937;
        --bg-header: #1a2332;
        --bg-elev: #283344;
        --border: #374151;
        --text: #f9fafb;
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
    }
}

/* Explicit dark toggle (overrides system light — html[] beats :root in specificity) */
html[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gray-50: #1f2937;
    --gray-100: #283344;
    --gray-200: #374151;
    --gray-300: #4b5563;
    --gray-500: #9ca3af;
    --gray-700: #d1d5db;
    --gray-900: #f9fafb;
    --bg: #111827;
    --bg-card: #1f2937;
    --bg-header: #1a2332;
    --bg-elev: #283344;
    --border: #374151;
    --text: #f9fafb;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Layout */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

header {
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 { font-size: 1.25rem; color: var(--text); }
header nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.9rem;
}
header nav a:hover { color: var(--primary); }

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text);
}

/* Upload */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: 0.5rem;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
}

.upload-area:hover { border-color: var(--primary); }
.upload-area.dragover { border-color: var(--primary); background: var(--gray-100); }

.upload-area input[type="file"] { display: none; }
.upload-area p { color: var(--text-secondary); margin-top: 0.5rem; font-size: 0.9rem; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-outline {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--gray-300);
}
.btn-outline:hover { background: var(--gray-100); }
.btn-sm { padding: 0.25rem 0.75rem; font-size: 0.8rem; }
.btn + .btn { margin-left: 0.5rem; }

/* Table */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th { text-align: left; padding: 0.75rem; border-bottom: 2px solid var(--border); color: var(--text-secondary); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; }
td { padding: 0.75rem; border-bottom: 1px solid var(--border); color: var(--text); }
tr:hover td { background: var(--gray-50); }

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-completed { background: #dcfce7; color: #166534; }
.badge-pending { background: #fef3c7; color: #92400e; }
.badge-error { background: #fee2e2; color: #991b1b; }
.badge-processing { background: #dbeafe; color: #1e40af; }

/* Normalization mapping table */
.mapping-table td { padding: 0.5rem; }
.mapping-table .arrow { color: var(--primary); font-weight: bold; }

/* Image gallery */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; }
.gallery-item {
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
    background: var(--bg-card);
}
.gallery-item img { width: 100%; height: 140px; object-fit: cover; }
.gallery-item .caption { padding: 0.5rem; font-size: 0.8rem; color: var(--text-secondary); }

/* Section tree */
.section-tree { list-style: none; padding-left: 0; }
.section-tree li { padding: 0.3rem 0; }
.section-tree .indent-1 { padding-left: 1.5rem; }
.section-tree .indent-2 { padding-left: 3rem; }
.section-tree .indent-3 { padding-left: 4.5rem; }
.section-tree .count { color: var(--text-secondary); font-size: 0.8rem; }

/* Progress / status */
.htmx-indicator { display: none; }
.htmx-request .htmx-indicator { display: inline-block; }
.spinner { display: inline-block; width: 1rem; height: 1rem; border: 2px solid var(--gray-300); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Alerts */
.alert { padding: 0.75rem 1rem; border-radius: 0.375rem; margin-bottom: 1rem; font-size: 0.9rem; }
.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-info { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.75rem; }
.stat-box { text-align: center; padding: 0.75rem; background: var(--gray-100); border-radius: 0.375rem; }
.stat-box .number { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-box .label { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; }