:root {
    --qltb-navy: #1e3a8a;
    --qltb-blue: #3b82f6;
    --qltb-red: #da251d;
    --qltb-gold: #f59e0b;
    --qltb-ink: #0f172a;
    --qltb-muted: #64748b;
    --qltb-line: #e2e8f0;
    --qltb-bg: #f1f5f9;
    --qltb-card: #ffffff;
    --qltb-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
    --qltb-radius: 20px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
}

body.qltb-body {
    font-family: Inter, Roboto, "Segoe UI", sans-serif;
    color: var(--qltb-ink);
    background:
        radial-gradient(circle at top right, rgba(59, 130, 246, 0.16), transparent 28%),
        radial-gradient(circle at left 20%, rgba(218, 37, 29, 0.08), transparent 24%),
        var(--qltb-bg);
}

.qltb-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 58%, #1d4ed8 100%);
    color: #fff;
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.25);
}

.qltb-header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.9rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.qltb-brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    min-width: 0;
}

.qltb-brand img {
    width: 52px;
    height: 52px;
    object-fit: contain;
    background: #fff;
    border-radius: 14px;
    padding: 4px;
}

.qltb-brand-text small {
    display: block;
    opacity: 0.85;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.qltb-brand-text strong {
    display: block;
    font-size: 1.05rem;
    line-height: 1.3;
}

.qltb-header-actions {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.qltb-user {
    text-align: right;
    font-size: 0.88rem;
}

.qltb-user span {
    display: block;
    opacity: 0.8;
    font-size: 0.75rem;
}

.qltb-main {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.4rem 1.25rem 3rem;
}

.qltb-btn {
    border: 0;
    border-radius: 999px;
    padding: 0.62rem 1.05rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    font-size: 0.92rem;
}

.qltb-btn-light {
    background: rgba(255, 255, 255, 0.14);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.qltb-btn-primary {
    background: var(--qltb-navy);
    color: #fff;
}

.qltb-btn-accent {
    background: var(--qltb-red);
    color: #fff;
}

.qltb-btn-ghost {
    background: #fff;
    color: var(--qltb-navy);
    border: 1px solid var(--qltb-line);
}

.qltb-btn-danger {
    background: #fff1f2;
    color: #be123c;
}

.qltb-btn:hover { transform: translateY(-1px); }

.qltb-login-wrap {
    min-height: calc(100vh - 96px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.qltb-login-card {
    width: min(460px, 100%);
    background: #fff;
    border-radius: 28px;
    padding: 2rem 1.6rem;
    box-shadow: var(--qltb-shadow);
    text-align: center;
}

.qltb-login-card .school-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1rem;
    border-radius: 22px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--qltb-navy), var(--qltb-blue));
    color: #fff;
    font-size: 2rem;
}

.qltb-login-card h1 {
    margin: 0 0 0.35rem;
    font-size: 1.35rem;
}

.qltb-login-hint {
    color: var(--qltb-muted);
    margin-bottom: 1.3rem;
}

.qltb-form-group {
    text-align: left;
    margin-bottom: 0.9rem;
}

.qltb-form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.35rem;
    font-size: 0.86rem;
}

.qltb-form-group input,
.qltb-form-group select,
.qltb-form-group textarea {
    width: 100%;
    border: 1px solid var(--qltb-line);
    border-radius: 12px;
    padding: 0.72rem 0.85rem;
    font: inherit;
    background: #fff;
}

.qltb-form-group textarea { min-height: 88px; resize: vertical; }

.qltb-alert {
    border-radius: 12px;
    padding: 0.75rem 0.9rem;
    margin-bottom: 0.9rem;
    font-size: 0.92rem;
}

.qltb-alert-error { background: #fff1f2; color: #9f1239; }
.qltb-alert-ok { background: #ecfdf5; color: #047857; }

.qltb-hero {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 1.2rem;
}

.qltb-hero h2 {
    margin: 0 0 0.25rem;
    font-size: 1.7rem;
}

.qltb-hero p {
    margin: 0;
    color: var(--qltb-muted);
}

.qltb-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.qltb-card {
    background: var(--qltb-card);
    border-radius: var(--qltb-radius);
    padding: 1.15rem;
    box-shadow: var(--qltb-shadow);
    border: 1px solid rgba(226, 232, 240, 0.9);
    cursor: pointer;
    min-height: 210px;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
    position: relative;
    overflow: hidden;
}

.qltb-card::after {
    content: "";
    position: absolute;
    inset: auto -20px -30px auto;
    width: 110px;
    height: 110px;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.06;
}

.qltb-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 22px 40px rgba(30, 58, 138, 0.16);
}

.qltb-card-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    font-size: 1.55rem;
    color: #fff;
}

.qltb-card h3 {
    margin: 0;
    font-size: 1.05rem;
}

.qltb-card p {
    margin: 0;
    color: var(--qltb-muted);
    font-size: 0.9rem;
    flex: 1;
}

.qltb-card-stats {
    display: flex;
    gap: 0.45rem;
    flex-wrap: wrap;
}

.qltb-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    border-radius: 999px;
    padding: 0.22rem 0.6rem;
    font-size: 0.78rem;
    font-weight: 700;
    background: #eff6ff;
    color: var(--qltb-navy);
}

.qltb-chip strong { font-size: 0.92rem; }

.qltb-card[data-module="devices"] .qltb-card-icon { background: linear-gradient(135deg, #1e3a8a, #3b82f6); }
.qltb-card[data-module="borrowings"] .qltb-card-icon { background: linear-gradient(135deg, #0f766e, #14b8a6); }
.qltb-card[data-module="loans"] .qltb-card-icon { background: linear-gradient(135deg, #b45309, #f59e0b); }
.qltb-card[data-module="maintenance"] .qltb-card-icon { background: linear-gradient(135deg, #9a3412, #f97316); }
.qltb-card[data-module="inventory"] .qltb-card-icon { background: linear-gradient(135deg, #6d28d9, #8b5cf6); }
.qltb-card[data-module="reports"] .qltb-card-icon { background: linear-gradient(135deg, #1d4ed8, #38bdf8); }
.qltb-card[data-module="qr"] .qltb-card-icon { background: linear-gradient(135deg, #334155, #64748b); }
.qltb-card[data-module="settings"] .qltb-card-icon { background: linear-gradient(135deg, #da251d, #fb7185); }

.qltb-workspace {
    background: #fff;
    border-radius: 28px;
    box-shadow: var(--qltb-shadow);
    overflow: hidden;
}

.qltb-ws-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    padding: 1.1rem 1.2rem;
    border-bottom: 1px solid var(--qltb-line);
    background: linear-gradient(180deg, #f8fbff, #fff);
}

.qltb-ws-head h2 { margin: 0 0 0.15rem; }
.qltb-ws-head p { margin: 0; color: var(--qltb-muted); font-size: 0.92rem; }

.qltb-toolbar {
    display: flex;
    gap: 0.65rem;
    flex-wrap: wrap;
    padding: 1rem 1.2rem 0;
}

.qltb-toolbar input,
.qltb-toolbar select {
    border: 1px solid var(--qltb-line);
    border-radius: 12px;
    padding: 0.62rem 0.8rem;
    font: inherit;
    min-width: 140px;
    background: #fff;
}

.qltb-toolbar input[type="search"],
.qltb-toolbar input[type="text"] { flex: 1; min-width: 180px; }

.qltb-body { padding: 1rem 1.2rem 1.4rem; overflow-x: auto; }

.qltb-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.qltb-table th,
.qltb-table td {
    padding: 0.72rem 0.6rem;
    border-bottom: 1px solid var(--qltb-line);
    text-align: left;
    vertical-align: top;
}

.qltb-table th {
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--qltb-muted);
    background: #f8fafc;
}

.qltb-table tr:hover td { background: #f8fbff; }

.qltb-actions { display: flex; gap: 0.35rem; flex-wrap: wrap; }

.qltb-pill {
    display: inline-flex;
    border-radius: 999px;
    padding: 0.15rem 0.55rem;
    font-size: 0.75rem;
    font-weight: 800;
}

.qltb-pill-success { background: #dcfce7; color: #166534; }
.qltb-pill-warn { background: #fef3c7; color: #92400e; }
.qltb-pill-danger { background: #fee2e2; color: #991b1b; }
.qltb-pill-info { background: #dbeafe; color: #1e3a8a; }

.qltb-empty {
    text-align: center;
    padding: 2.4rem 1rem;
    color: var(--qltb-muted);
}

.qltb-pager {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.qltb-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.qltb-stat {
    background: #f8fafc;
    border-radius: 16px;
    padding: 0.9rem;
}

.qltb-stat span { display: block; color: var(--qltb-muted); font-size: 0.82rem; }
.qltb-stat strong { font-size: 1.4rem; }

.qltb-modal {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: 4vh 1rem;
    z-index: 50;
    overflow: auto;
}

.qltb-modal.is-open { display: flex; }

.qltb-modal-card {
    width: min(720px, 100%);
    background: #fff;
    border-radius: 24px;
    padding: 1.2rem;
    box-shadow: var(--qltb-shadow);
}

.qltb-modal-card h3 { margin: 0 0 1rem; }

.qltb-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.qltb-form-grid .full { grid-column: 1 / -1; }

.qltb-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.6rem;
    margin-top: 1rem;
}

.qltb-toast {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    background: #0f172a;
    color: #fff;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    display: none;
    z-index: 70;
    max-width: min(360px, calc(100vw - 2rem));
}

.qltb-toast.is-on { display: block; }
.qltb-toast.is-error { background: #9f1239; }

.qltb-hidden { display: none !important; }

.qltb-qr-preview {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 1rem;
    align-items: start;
}

.qltb-qr-box {
    background: #fff;
    border: 1px solid var(--qltb-line);
    border-radius: 16px;
    padding: 0.8rem;
    text-align: center;
}

.qltb-qr-box svg { width: 100%; height: auto; }

.qltb-print-sheet { display: none; }

.qltb-subtabs {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    width: 100%;
}

.qltb-subtab {
    border: 1px solid var(--qltb-line);
    background: #fff;
    color: var(--qltb-navy);
    border-radius: 999px;
    padding: 0.55rem 1rem;
    font-weight: 700;
    cursor: pointer;
}

.qltb-subtab.is-on {
    background: var(--qltb-navy);
    color: #fff;
    border-color: var(--qltb-navy);
}

.qltb-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.qltb-danger-box {
    border: 2px solid #da251d;
    background: #fff1f2;
    border-radius: 18px;
    padding: 1rem;
}

.qltb-danger-box h3 { color: #9f1239; }

.qltb-preview {
    max-height: 240px;
    overflow: auto;
    border: 1px solid var(--qltb-line);
    border-radius: 12px;
    margin: 0.6rem 0;
}

.qltb-readonly {
    background: #f8fafc;
    border-radius: 12px;
    padding: 0.7rem 0.85rem;
    font-weight: 700;
}

@media print {
    body * { visibility: hidden; }
    .qltb-print-sheet, .qltb-print-sheet * { visibility: visible; }
    .qltb-print-sheet {
        display: block;
        position: absolute;
        inset: 0;
        padding: 12mm;
    }
    .qltb-print-label {
        width: 63.5mm;
        height: 38.1mm;
        border: 1px solid #cbd5e1;
        border-radius: 4px;
        padding: 3mm;
        display: flex;
        gap: 3mm;
        align-items: center;
        page-break-inside: avoid;
    }
    .qltb-print-label svg { width: 28mm; height: 28mm; }
}

@media (max-width: 1100px) {
    .qltb-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
    .qltb-header-inner, .qltb-hero, .qltb-ws-head, .qltb-qr-preview, .qltb-form-grid {
        grid-template-columns: 1fr;
        flex-direction: column;
        align-items: stretch;
        text-align: left;
    }
    .qltb-grid { grid-template-columns: 1fr; }
    .qltb-user { text-align: left; }
    .qltb-brand-text strong { font-size: 0.95rem; }
}