:root {
    /* Modern Color Palette */
    --primary-color: #3b82f6;
    /* Blue 500 */
    --primary-hover: #2563eb;
    /* Blue 600 */
    --secondary-color: #64748b;
    /* Slate 500 */
    --success-color: #10b981;
    /* Emerald 500 */
    --danger-color: #ef4444;
    /* Red 500 */

    --bg-color: #f8fafc;
    /* Slate 50 */
    --card-bg: #ffffff;

    --text-main: #0f172a;
    /* Slate 900 */
    --text-muted: #64748b;
    /* Slate 500 */

    --border-color: #e2e8f0;
    /* Slate 200 */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

body {
    background-color: var(--bg-color);
    background-image: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.025em;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card,
.login-card,
.stat-card {
    animation: fadeInUp 0.4s ease-out forwards;
}

/* Login Page */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
    background: radial-gradient(circle at top right, #dbeafe, transparent 40%),
        radial-gradient(circle at bottom left, #f0f9ff, transparent 40%);
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-xl);
    padding: 3rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

/* Navigation */
.main-nav {
    background: rgba(255, 255, 255, 0.8);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
}

.nav-brand {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: -0.025em;
}

.nav-links {
    display: flex;
    gap: 0.25rem;
    overflow-x: auto;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: 999px;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    white-space: nowrap;
}

.nav-links a:hover {
    background-color: #eff6ff;
    color: var(--primary-color);
}

.nav-links a.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Stat Cards */
.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.25rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.stat-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.bg-blue-100 {
    background-color: #dbeafe;
}

.text-blue-600 {
    color: #2563eb;
}

.bg-green-100 {
    background-color: #dcfce7;
}

.text-green-600 {
    color: #16a34a;
}

.bg-purple-100 {
    background-color: #f3e8ff;
}

.text-purple-600 {
    color: #9333ea;
}

.stat-value {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-main);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Buttons */
.btn {
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border: none;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(59, 130, 246, 0.3);
}

.btn-outline-secondary {
    border-color: var(--border-color);
    color: var(--text-muted);
    background: white;
}

.btn-outline-secondary:hover {
    background-color: #f8fafc;
    color: var(--text-main);
    border-color: #cbd5e1;
}

/* Forms */
.form-control,
.form-select {
    border-color: var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    background-color: #f8fafc;
}

.form-control:focus,
.form-select:focus {
    background-color: white;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-label {
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Tables */
.table {
    margin-bottom: 0;
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    background-color: #f8fafc;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    background: white;
}

.table-hover tbody tr:hover td {
    background-color: #f8fafc;
}

/* Warehouse Slot Grid */
.slot-grid-wrapper {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    background: #f8fafc;
    overflow-x: auto;
}

.slot-grid-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 6px;
}

.slot-grid-table td {
    border: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    background: white;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: var(--radius-md);
    position: relative;
    box-shadow: var(--shadow-sm);
}

.slot-grid-table td:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
    z-index: 1;
}

.slot-grid-table td.selected {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.slot-grid-table td.occupied {
    background: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

.slot-grid-table td.occupied:hover {
    background: #fee2e2;
}

.slot-grid-table td.occupied.selected {
    background: #ef4444;
    color: white;
    border-color: #ef4444;
}

.slot-label {
    font-weight: 700;
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.slot-badge {
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.05);
    display: inline-block;
    font-weight: 600;
}

.slot-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: #1e293b;
    color: #fff;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    line-height: 1.4;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
    z-index: 10;
    visibility: hidden;
    box-shadow: var(--shadow-lg);
}

.slot-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border-width: 6px;
    border-style: solid;
    border-color: #1e293b transparent transparent transparent;
}

.slot-grid-table td:hover .slot-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-12px);
}

/* Article Thumbnails */
.article-thumb {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: white;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.article-thumb:hover img {
    transform: scale(1.1);
}

/* Image Preview Popover */
.image-preview-popover {
    position: fixed;
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: 0.75rem;
    box-shadow: var(--shadow-xl);
    z-index: 2000;
    display: none;
    border: 1px solid var(--border-color);
    animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.image-preview-popover img {
    max-width: 280px;
    max-height: 280px;
    border-radius: var(--radius-md);
    display: block;
}

/* Search Highlight */
.search-highlight {
    background-color: #fef08a;
    padding: 0 2px;
    border-radius: 2px;
    color: #854d0e;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        width: 100%;
        justify-content: flex-start;
        padding-bottom: 0.5rem;
    }

    .card {
        padding: 1.5rem !important;
    }
}

/* Utilities */
.text-primary {
    color: var(--primary-color) !important;
}

.bg-light {
    background-color: #f8fafc !important;
}