:root {
    --bg-deep: #f0f1f3;
    --bg: #f8f9fa;
    --surface: #ffffff;
    --surface-raised: #ffffff;
    --border: #d0d5dd;
    --border-subtle: #e4e7ec;
    --text: #1a1a1a;
    --text-secondary: #475467;
    --text-dim: #667085;
    --cyan: #0975b0;
    --cyan-dim: rgba(9, 117, 176, 0.1);
    --cyan-glow: rgba(9, 117, 176, 0.2);
    --amber: #b54708;
    --amber-dim: rgba(181, 71, 8, 0.08);
    --green: #067647;
    --green-dim: rgba(6, 118, 71, 0.08);
    --red: #d92d20;
    --sidebar-w: 64px;
    --font-display: 'Outfit', sans-serif;
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ─── Sidebar ─── */
.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-deep);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 50;
    padding-top: 8px;
}

.sidebar-brand {
    width: 40px; height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    position: relative;
}

.sidebar-brand::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 8px; right: 8px;
    height: 1px;
    background: var(--border);
}

.sidebar-brand svg {
    width: 26px; height: 26px;
    color: var(--cyan);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 16px;
    width: 100%;
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px; height: 44px;
    margin: 0 auto;
    color: var(--text-dim);
    text-decoration: none;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
    position: relative;
}

.nav-item:hover {
    color: var(--text-secondary);
    background: var(--surface);
}

.nav-item.active {
    color: var(--cyan);
    background: var(--cyan-dim);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--cyan);
    border-radius: 0 2px 2px 0;
}

.nav-item svg { width: 20px; height: 20px; }

.nav-tooltip {
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--text);
    border: 1px solid var(--border);
    color: #fff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 13px;
    font-family: var(--font-body);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s;
    z-index: 100;
}

.nav-item:hover .nav-tooltip { opacity: 1; }

/* ─── Main ─── */
.main {
    margin-left: var(--sidebar-w);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.topbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 32px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 40;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.topbar h2 {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.topbar-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--cyan);
    background: var(--cyan-dim);
    padding: 2px 8px;
    border-radius: 3px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.page-content {
    padding: 28px 32px;
    flex: 1;
}

/* ─── Animations ─── */
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-in {
    animation: fadeSlideIn 0.3s ease forwards;
    opacity: 0;
}

.animate-in:nth-child(1) { animation-delay: 0.04s; }
.animate-in:nth-child(2) { animation-delay: 0.08s; }
.animate-in:nth-child(3) { animation-delay: 0.12s; }
.animate-in:nth-child(4) { animation-delay: 0.16s; }

/* ─── Cards ─── */
.card {
    background: var(--surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.card-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-subtle);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.02em;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.card-body { padding: 18px; }

/* ─── Stats ─── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    padding: 18px 20px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, var(--cyan), transparent);
    opacity: 0.5;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 700;
    margin-top: 4px;
    color: var(--text);
    letter-spacing: -0.02em;
}

.stat-value.stat-sm {
    font-size: 15px;
    font-weight: 500;
    font-family: var(--font-mono);
}

/* ─── Tables ─── */
table { width: 100%; border-collapse: collapse; }

th {
    text-align: left;
    padding: 10px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
    font-weight: 600;
    white-space: nowrap;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 14px;
}

tbody tr { transition: background 0.1s; }
tbody tr:hover td { background: var(--cyan-dim); }
tbody tr:last-child td { border-bottom: none; }

/* ─── Badges ─── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.badge svg { width: 14px; height: 14px; flex-shrink: 0; }
.badge-cyan { background: var(--cyan-dim); color: var(--cyan); }
.badge-amber { background: var(--amber-dim); color: var(--amber); }
.badge-green { background: var(--green-dim); color: var(--green); }
.badge-count {
    background: var(--bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    transition: all 0.15s;
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg);
    color: var(--text);
    border-color: var(--text-dim);
}

.btn svg { width: 14px; height: 14px; }

.btn-cyan {
    background: var(--cyan-dim);
    color: var(--cyan);
    border-color: rgba(9, 117, 176, 0.25);
}

.btn-cyan:hover {
    background: rgba(9, 117, 176, 0.15);
    border-color: rgba(9, 117, 176, 0.4);
    color: var(--cyan);
}

.btn-amber {
    background: var(--amber-dim);
    color: var(--amber);
    border-color: rgba(181, 71, 8, 0.25);
}

.btn-amber:hover {
    background: rgba(181, 71, 8, 0.15);
    border-color: rgba(181, 71, 8, 0.4);
    color: var(--amber);
}

.btn-red {
    background: rgba(217, 45, 32, 0.08);
    color: var(--red);
    border-color: rgba(217, 45, 32, 0.25);
}

.btn-red:hover {
    background: rgba(217, 45, 32, 0.15);
    border-color: rgba(217, 45, 32, 0.4);
    color: var(--red);
}

.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ─── Search ─── */
.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0 12px;
    height: 36px;
    width: 300px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box:focus-within {
    border-color: var(--cyan);
    box-shadow: 0 0 0 2px var(--cyan-dim);
}

.search-box svg {
    width: 16px; height: 16px;
    color: var(--text-dim);
    flex-shrink: 0;
}

.search-box input {
    border: none;
    outline: none;
    font-family: var(--font-body);
    font-size: 14px;
    width: 100%;
    background: transparent;
    color: var(--text);
}

.search-box input::placeholder { color: var(--text-dim); }

/* ─── Clickable ─── */
.clickable { cursor: pointer; }

/* ─── Detail sections ─── */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.detail-field label {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-dim);
    margin-bottom: 4px;
}

.detail-field .value {
    font-size: 15px;
    font-weight: 500;
    word-break: break-all;
}

.detail-field .value.mono {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-secondary);
}

/* ─── Back link ─── */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13px;
    cursor: pointer;
    margin-bottom: 20px;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color 0.15s;
}

.back-link:hover { color: var(--cyan); }
.back-link svg { width: 14px; height: 14px; }

/* ─── BOM Expansion ─── */
.bom-expand-row td {
    padding: 0 !important;
    background: var(--bg) !important;
}

.bom-expand-content {
    padding: 16px 16px 16px 48px;
    border-left: 3px solid var(--cyan-dim);
    margin-left: 16px;
}

.bom-expand-content .info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 6px 24px;
}

.bom-expand-content .info-item {
    font-size: 13px;
    padding: 2px 0;
}

.bom-expand-content .info-item .lbl {
    color: var(--text-dim);
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-right: 6px;
}

.bom-expand-content .info-item .val {
    font-family: var(--font-mono);
    color: var(--text);
}

.bom-section-title {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--cyan);
    margin: 14px 0 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.bom-section-title svg { width: 14px; height: 14px; flex-shrink: 0; }
.bom-section-title:first-child { margin-top: 0; }

.bom-section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-subtle);
}

/* ─── File Browser ─── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 13px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    padding: 8px 14px;
    background: var(--surface);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
}

.breadcrumb a {
    color: var(--cyan);
    text-decoration: none;
    cursor: pointer;
    transition: opacity 0.15s;
}

.breadcrumb a:hover { opacity: 0.7; }
.breadcrumb .sep { color: var(--text-dim); font-size: 11px; }
.breadcrumb .current { color: var(--text); font-weight: 500; }

.file-name-cell {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-name-cell svg { width: 18px; height: 18px; flex-shrink: 0; }

.file-name-cell a {
    color: var(--text);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.15s;
}

.file-name-cell a:hover { color: var(--cyan); }

/* ─── Loading / Empty ─── */
.loading, .empty {
    text-align: center;
    padding: 60px 24px;
    color: var(--text-dim);
    font-size: 14px;
    font-family: var(--font-mono);
}

.loading::before {
    content: '';
    display: block;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top-color: var(--cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

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

/* ─── Chevron toggle ─── */
.chevron-toggle {
    display: inline-flex;
    width: 18px; height: 18px;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
    color: var(--text-dim);
}

.chevron-toggle.open {
    transform: rotate(90deg);
    color: var(--cyan);
}

/* ─── Drawing cards grid ─── */
.drawings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
}

.drawing-card {
    background: var(--surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    padding: 18px 20px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.drawing-card:hover {
    border-color: var(--cyan);
    background: var(--cyan-dim);
    box-shadow: 0 2px 8px rgba(9, 117, 176, 0.1);
}

.drawing-card-title {
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}

.drawing-card-sub {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ─── Equipment Groups ─── */
.equip-group {
    margin-bottom: 16px;
}

.equip-group:last-child { margin-bottom: 0; }

.equip-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    transition: all 0.15s;
    user-select: none;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.equip-header:hover { background: var(--cyan-dim); }

.equip-header .chevron-toggle { flex-shrink: 0; }

.equip-header-title {
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
}

.equip-header-number {
    font-family: var(--font-mono);
    font-size: 15px;
    color: var(--cyan);
    font-weight: 600;
}

.equip-header-meta {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
}

.equip-header-stat {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-dim);
}

.equip-header-stat strong {
    color: var(--text-secondary);
}

.equip-body {
    border: 1px solid var(--border-subtle);
    border-top: none;
    border-radius: 0 0 6px 6px;
    overflow: hidden;
}

.equip-body table { margin: 0; }

.equip-group.collapsed .equip-body { display: none; }
.equip-group.collapsed .equip-header { border-radius: 6px; }

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .main { margin-left: 0; }
    .search-box { width: 100%; }
    .topbar { padding: 0 16px; }
    .page-content { padding: 16px; }
}