:root {
    --bg: #eef4fb;
    --surface: #ffffff;
    --surface-2: #f7fafe;
    --border: #d7e3f2;
    --border-2: #b8cae2;
    --text: #15233a;
    --muted: #677791;
    --accent: #1d5ecb;
    --accent-2: #133f8d;
    --accent-lt: #dbeafe;
    --red: #d71f26;
    --red-lt: #fee2e2;
    --sidebar: #0f1c32;
    --sidebar-2: #17305d;
    --purple: #7c3aed;
    --purple-lt: #ede9fe;
    --teal: #0d9488;
    --teal-lt: #ccfbf1;
    --amber: #d97706;
    --amber-lt: #fef3c7;
    --success: #16a34a;
    --success-lt: #dcfce7;
    --radius: 10px;
    --radius-lg: 16px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --mono: 'Courier New', Courier, monospace;
}

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

body {
    font-family: var(--font);
    background: linear-gradient(180deg, #f5f8fd 0%, var(--bg) 100%);
    color: var(--text);
    font-size: 15px;
    line-height: 1.6;
    padding-left: 280px;
}

.mobile-nav-toggle,
.mobile-topbar,
.sidebar-overlay { display: none; }

.mobile-nav-toggle {
    position: fixed;
    top: 20px;
    left: 14px;
    z-index: 1400;
    width: 35px;
    height: 35px;
    border: none; 
    background: #FFF; 
    cursor: pointer;
}
.sidebar-open .mobile-nav-toggle {
    display: none;
}
.menu-close {
    display: none;
}
.sidebar-open .menu-close {
    display: block;
    height: 35px;
    width: 35px; 
    position: absolute;
    right: 15px;
    top: 15px;
}
.mobile-nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    margin: 4px auto;
    background: #fff;
    border-radius: 999px;
}

.mobile-topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1200;
    height: 72px;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.mobile-topbar-icon {
    width: 30px;
    height: 30px;
    object-fit: contain;
}

.mobile-topbar-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--accent-2);
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 28, 50, 0.45);
    z-index: 1290;
}

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 280px;
    background: linear-gradient(180deg, var(--sidebar) 0%, var(--sidebar-2) 100%);
    color: #dbe7fb;
    border-right: 1px solid rgba(255,255,255,0.08);
    display: flex;
    flex-direction: column;
    padding: 22px 16px;
    z-index: 1300;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 10px 20px;
    margin-bottom: 18px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-brand-mark {
    width: 46px;
    height: 46px;
    object-fit: contain;
    border-radius: 12px;
    background: rgba(255,255,255,0.95);
    padding: 6px;
}

.sidebar-title {
    color: #fff;
    font-size: 15px;
    font-weight: 700;
}

.sidebar-subtitle {
    color: #a7bad7;
    font-size: 12px;
    margin-top: 2px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 12px;
    border-radius: 12px;
    text-decoration: none;
    color: #d2dff4;
    font-size: 14px;
    transition: all 0.15s ease;
}

.sidebar-link:hover {
    background: rgba(255,255,255,0.07);
    color: #fff;
    transform: translateX(2px);
}

.sidebar-link.active {
    background: linear-gradient(90deg, rgba(29,94,203,0.32), rgba(215,31,38,0.18));
    border: 1px solid rgba(255,255,255,0.08);
    color: #fff;
}

.sidebar-link-icon {
    width: 18px;
    text-align: center;
    font-size: 14px;
}

.sidebar-user {
    padding: 16px 10px 4px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.sidebar-user-name {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.sidebar-user-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.sidebar-logout {
    background: #ffffff;
    color: var(--red);
    border-color: transparent;
}

.sidebar-logout:hover {
    background: #fff1f1;
    color: var(--red);
}

.main-content {
    max-width: 1400px;
    padding: 28px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 26px;
}

.page-header h2 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.page-header-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 14px 32px rgba(21, 35, 58, 0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.card-header h3 { font-size: 15px; font-weight: 700; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.icon-blue { background: var(--accent-lt); color: var(--accent); }
.icon-purple { background: var(--purple-lt); color: var(--purple); }
.icon-teal { background: var(--teal-lt); color: var(--teal); }
.icon-amber { background: var(--amber-lt); color: var(--amber); }

.stat-number {
    font-size: 26px;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -1px;
}

.stat-label {
    display: block;
    font-size: 12px;
    color: var(--muted);
    margin-top: 4px;
}

.table-wrap { overflow-x: auto; }

.data-table,
.detail-table,
.child-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.child-table th {
    text-align: left;
    padding: 11px 12px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--muted);
    background: var(--surface-2);
    border-bottom: 1px solid var(--border);
}

.data-table td,
.child-table td {
    padding: 11px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.data-table tr:hover td,
.child-table tr:hover td {
    background: #f8fbff;
}

.data-table tr:last-child td,
.child-table tr:last-child td,
.detail-table tr:last-child th,
.detail-table tr:last-child td {
    border-bottom: none;
}

.data-table .actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.data-table th.cb-col,
.data-table td.cb-col {
    width: 36px;
    text-align: center;
    padding-left: 8px;
    padding-right: 0;
}

.data-table input[type=checkbox] {
    width: 15px;
    height: 15px;
    accent-color: var(--accent);
    cursor: pointer;
}

.detail-table th {
    width: 180px;
    text-align: left;
    padding: 12px 0;
    color: var(--muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.detail-table td {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 999px;
    background: #eef3f9;
    border: 1px solid var(--border);
    color: var(--muted);
}

.badge-purple { background: var(--purple-lt); color: var(--purple); border-color: transparent; }
.badge-teal { background: var(--teal-lt); color: var(--teal); border-color: transparent; }
.badge-open { background: var(--success-lt); color: var(--success); border-color: transparent; }
.badge-closed { background: var(--red-lt); color: var(--red); border-color: transparent; }
.sr-badge { background: var(--accent-lt); color: var(--accent); border: none; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 10px;
    border: 1px solid var(--border-2);
    background: var(--surface);
    color: var(--text);
    text-decoration: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    transition: all 0.15s ease;
}

.btn:hover { background: #f8fbff; border-color: #9fb3ce; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn-success { background: var(--red); color: #fff; border-color: var(--red); }
.btn-success:hover { background: #b91c1c; border-color: #b91c1c; }
.btn-outline { background: transparent; }
.btn-danger { background: var(--red-lt); color: var(--red); border-color: transparent; }
.btn-danger:hover { background: #fecaca; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.5; pointer-events: none; }

.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 600;
    color: #44536b;
}

.required { color: var(--red); }

input[type=text],
input[type=password],
input[type=number],
input[type=email],
input[type=date],
input[type=time],
select,
textarea {
    width: 100%;
    padding: 10px 13px;
    font-size: 14px;
    font-family: var(--font);
    border: 1px solid var(--border-2);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text);
    outline: none;
    transition: border 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(29, 94, 203, 0.12);
}

input:disabled {
    background: #edf2f8;
    color: var(--muted);
    cursor: not-allowed;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.input-with-btn {
    display: flex;
    gap: 8px;
}

.input-with-btn input { flex: 1; }

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    margin-bottom: 20px;
}

.alert-error { background: var(--red-lt); color: var(--red); border: 1px solid #fca5a5; }
.alert-success { background: var(--success-lt); color: var(--success); border: 1px solid #86efac; }

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-left: 0;
    background: linear-gradient(135deg, #e9f0fa 0%, #f9fbfe 100%);
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 36px;
    box-shadow: 0 20px 40px rgba(21, 35, 58, 0.08);
}

.auth-logo { text-align: center; margin-bottom: 32px; }
.logo-icon { font-size: 36px; margin-bottom: 8px; }
.auth-logo h1 { font-size: 20px; font-weight: 700; color: var(--accent-2); }
.auth-logo p { color: var(--muted); font-size: 13px; margin-top: 4px; }
.auth-hint { text-align: center; color: var(--muted); font-size: 12px; margin-top: 16px; }

.item-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
    align-items: start;
}

.form-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 20px;
    align-items: start;
}

.scanner-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

.code-card,
.preview-box { text-align: center; }

.code-display,
.preview-box {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.code-display {
    margin: 16px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.preview-box {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 12px;
}

.code-label {
    font-family: var(--mono);
    font-size: 14px;
    color: var(--muted);
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin: 24px 0 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-lt);
}

.section-heading h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--accent);
}

.empty-state {
    text-align: center;
    padding: 24px;
    color: #94a3b8;
    font-size: 14px;
}

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(21, 35, 58, 0.55);
    z-index: 1500;
    align-items: center;
    justify-content: center;
}

.modal-overlay.open { display: flex; }

.modal-box {
    background: #fff;
    border-radius: 16px;
    padding: 28px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 50px rgba(21, 35, 58, 0.25);
}

.modal-box h3 { margin-bottom: 18px; font-size: 17px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 18px; }
.modal-input {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border-2);
    border-radius: 8px;
    font-size: 13px;
}

.filters-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.filters-bar input,
.filters-bar select {
    flex: 1;
    min-width: 160px;
    max-width: 280px;
}

.bulk-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    padding: 10px 14px;
    background: linear-gradient(90deg, rgba(29,94,203,0.12), rgba(215,31,38,0.08));
    border: 1px solid #b8cae2;
    border-radius: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.bulk-bar span {
    flex: 1;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent-2);
}

.text-muted { color: var(--muted); }
.text-center { text-align: center; }

code {
    font-family: var(--mono);
    font-size: 12px;
    background: var(--surface-2);
    padding: 2px 6px;
    border-radius: 6px;
    color: var(--accent);
}

@media (max-width: 1024px) {
    body {
        padding-left: 0;
        padding-top: 72px;
    }
    .mobile-nav-toggle,
    .mobile-topbar {
        display: flex;
    }
    .sidebar-overlay {
        display: block;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.2s ease, visibility 0.2s ease;
    }
body.sidebar-open .sidebar-overlay {
        opacity: 1;
        visibility: visible;
    }
    body.sidebar-open {
        overflow: hidden;
    }
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.22s ease;
        box-shadow: 0 18px 40px rgba(15, 28, 50, 0.28);
    }
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
    .main-content {
        padding: 20px 16px 28px;
    }
    .item-layout,
    .form-layout,
    .scanner-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .form-row,
    .form-row-3,
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }
    .filters-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .filters-bar input,
    .filters-bar select {
        max-width: none;
    }
    .sidebar-user-meta {
        flex-direction: column;
        align-items: flex-start;
    }
}