:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --bg: #f8fafc;
    --card: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-muted: #64748b;
    --danger: #ef4444;
    --success: #16a34a;
    --accent: #7c3aed;
    --radius: 12px;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: 'Segoe UI', Tahoma, Arial, sans-serif; line-height: 1.5; }

/* ---------- Top bar ---------- */
header.topbar {
    display: flex; align-items: center; gap: 24px;
    background: linear-gradient(90deg, #0f172a, #1e293b);
    padding: 14px 24px; flex-wrap: wrap;
}
.brand { color: #fff; font-weight: 800; font-size: 1.2rem; text-decoration: none; margin-inline-end: auto; }
.topnav { display: flex; gap: 4px; flex-wrap: wrap; }
.topnav a { color: #cbd5e1; text-decoration: none; padding: 8px 14px; border-radius: 8px; font-size: 0.92rem; font-weight: 600; }
.topnav a:hover { background: rgba(255,255,255,0.08); color: #fff; }
.topnav a.active { background: var(--primary); color: #fff; }
.lang-toggle { background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); padding: 7px 14px; border-radius: 999px; text-decoration: none; color: #fff; font-weight: 600; font-size: 0.85rem; white-space: nowrap; }
.lang-toggle:hover { background: rgba(255,255,255,0.18); }

.container { max-width: 1180px; margin: 0 auto; padding: 24px 16px 60px; }

h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 0 0 12px; }
.tagline { color: var(--text-muted); margin: 0 0 20px; }
.page-header { display:flex; justify-content:space-between; align-items:flex-start; gap:16px; flex-wrap:wrap; margin-bottom:8px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 16px; }
label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 4px; }
input[type="number"], input[type="text"], input[type="password"], textarea, select {
    width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 0.95rem; background: #fff; font-family: inherit;
}
textarea { resize: vertical; min-height: 70px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

.checkbox-row { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
.checkbox-row input { width: 18px; height: 18px; flex-shrink: 0; }
.checkbox-row label { margin: 0; color: var(--text); font-size: 0.9rem; }

.btn { display: inline-flex; align-items: center; gap: 6px; border: none; border-radius: 8px; padding: 10px 18px; font-size: 0.95rem; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #f1f5f9; color: var(--text); }
.btn-secondary:hover { background: #e2e8f0; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #6d28d9; }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid #fecaca; }
.btn-danger:hover { background: #fef2f2; }
.btn-sm { padding: 6px 12px; font-size: 0.82rem; }
.actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

.alert { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.alert-success { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.alert strong { display: block; margin-bottom: 2px; }

/* ---------- Project cards ---------- */
.project-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.project-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; transition: box-shadow .15s, transform .15s; position: relative; }
.project-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); transform: translateY(-2px); }
.project-card-link { text-decoration: none; color: var(--text); display: block; }
.project-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.project-card .meta { color: var(--text-muted); font-size: 0.82rem; }
.project-card-delete { margin-top: 12px; }
.status-badge { display: inline-block; font-size: 0.72rem; padding: 2px 9px; border-radius: 999px; background: #dcfce7; color: #166534; font-weight: 700; margin-top: 8px; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state .icon { font-size: 2.5rem; margin-bottom: 10px; }

/* ---------- Unit / part cards ---------- */
.unit-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.unit-card { background: #f8fafc; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.unit-card h4 { margin: 0 0 6px; font-size: 0.98rem; }
.unit-card .dims { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 8px; }
.unit-card .row-actions { display: flex; gap: 8px; margin-top: 10px; }

table.data-table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 0.88rem; }
table.data-table th, table.data-table td { border: 1px solid var(--border); padding: 7px 10px; text-align: start; }
table.data-table thead th { background: #f1f5f9; font-weight: 700; color: var(--text-muted); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.02em; }
table.data-table tbody tr:nth-child(even) { background: #fafbfc; }

/* ---------- Stats ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin-bottom: 20px; }
.stat-box { background: #f0f9ff; border: 1px solid #bae6fd; border-radius: var(--radius); padding: 12px; text-align: center; }
.stat-box .value { font-size: 1.3rem; font-weight: 700; color: var(--primary-dark); }
.stat-box .label { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }
.stat-box.cost { background: #f5f3ff; border-color: #ddd6fe; }
.stat-box.cost .value { color: var(--accent); }

.grand-total-card { background: linear-gradient(135deg, #0ea5e9, #7c3aed); color: #fff; border: none; }
.grand-total-card h2 { color: #fff; }
.grand-total-card .stats-grid .stat-box { background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.25); }
.grand-total-card .stat-box .value { color: #fff; }
.grand-total-card .stat-box .label { color: rgba(255,255,255,0.85); }

.material-result-block { margin-bottom: 30px; padding-bottom: 10px; border-bottom: 1px dashed var(--border); }
.material-result-block:last-of-type { border-bottom: none; }
.material-result-title { display: flex; align-items: center; gap: 10px; font-size: 1.05rem; font-weight: 700; margin-bottom: 12px; }
.material-badge { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 700; font-size: 0.85rem; flex-shrink: 0; }

.sheet-block { margin-bottom: 24px; }
.sheet-block h4 { font-size: 0.95rem; margin-bottom: 8px; }
.sheet-svg-wrap { border: 1px solid var(--border); border-radius: var(--radius); overflow: auto; background: repeating-conic-gradient(#f8fafc 0% 25%, #f1f5f9 0% 50%) 50% / 20px 20px; }
.sheet-svg-wrap svg { display: block; }
.legend-note { font-size: 0.78rem; color: var(--text-muted); margin-top: 6px; }

.section-subhead { font-size: 0.85rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; margin: 16px 0 8px; }

.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 18px; flex-wrap: wrap; }
.tabs a { padding: 10px 16px; text-decoration: none; color: var(--text-muted); font-weight: 600; font-size: 0.9rem; border-bottom: 2px solid transparent; margin-bottom: -2px; }
.tabs a.active { color: var(--primary-dark); border-bottom-color: var(--primary); }

.badge { display: inline-block; font-size: 0.7rem; padding: 1px 7px; border-radius: 999px; background: #e0f2fe; color: var(--primary-dark); font-weight: 600; }
.badge-warn { background: #fef3c7; color: #92400e; }

[dir="rtl"] table.data-table th, [dir="rtl"] table.data-table td { text-align: right; }

.mini-check { display: inline-flex; align-items: center; gap: 2px; font-size: 0.72rem; color: var(--text-muted); margin: 0; margin-inline-end: 6px; cursor: pointer; }
.mini-check input { width: 14px; height: 14px; cursor: pointer; }

footer.site-footer { text-align: center; color: var(--text-muted); font-size: 0.82rem; margin-top: 40px; }

/* ---------- Quick Cut: multi-material builder ---------- */
.material-block { --material-color: var(--primary); border-top: 4px solid var(--material-color); padding-top: 4px; }
.material-block-header { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.material-block .material-badge { background: var(--material-color); }
.material-title-input { font-weight: 700; font-size: 1rem; border: none !important; background: transparent !important; padding: 4px 2px !important; width: auto; flex: 1; min-width: 120px; }
.material-title-input:focus { outline: 1px solid var(--border); border-radius: 4px; }

table.parts-table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 0.85rem; }
table.parts-table th { text-align: start; font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.02em; padding: 4px 6px; }
table.parts-table td { padding: 4px 6px; vertical-align: middle; }
table.parts-table td input[type="text"], table.parts-table td input[type="number"] { padding: 6px 8px; font-size: 0.88rem; }
.edges-cell { white-space: nowrap; }
.btn-remove, .btn-remove-material { background: transparent; border: 1px solid #fecaca; color: var(--danger); border-radius: 6px; padding: 5px 10px; font-size: 0.78rem; cursor: pointer; white-space: nowrap; }
.btn-remove:hover, .btn-remove-material:hover { background: #fef2f2; }

[dir="rtl"] table.parts-table th, [dir="rtl"] table.parts-table td { text-align: right; }

@media (max-width: 640px) {
    header.topbar { flex-direction: column; align-items: stretch; }
    .brand { margin-inline-end: 0; }
}

@media print {
    body { background: #fff; }
    .no-print { display: none !important; }
    .container { max-width: 100%; padding: 0; }
    .card, .material-result-block { break-inside: avoid; }
    .sheet-block { break-inside: avoid; }
    .grand-total-card { background: #f1f5f9 !important; color: #000 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
    .grand-total-card h2, .grand-total-card .stat-box .value, .grand-total-card .stat-box .label { color: #000 !important; }
}