:root {
    --primary: #d97706;
    --primary-light: #f59e0b;
    --primary-dark: #92400e;
    --secondary: #1f2937;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #333333;
    --text-muted: #6c757d;
    --border: #e9ecef;
    --success: #2ecc71;
    --danger: #e74c3c;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--card-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.mobile-menu-toggle,
.sidebar-backdrop {
    display: none;
}

.brand {
    padding: 24px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

.nav-links {
    list-style: none;
    padding: 24px 16px;
    flex: 1;
}

.nav-links li {
    margin-bottom: 8px;
}

.nav-links a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
    background-color: var(--primary-light);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 32px;
}

.page-header {
    margin-bottom: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary);
}

/* Cards & Layout */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.stat-card {
    display: flex;
    align-items: center;
    padding: 24px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.stat-card-info h3 {
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
}

.stat-card-info h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 8px;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 16px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--secondary);
}

input, select, textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(201, 138, 68, 0.2);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--secondary);
}

tr:hover {
    background-color: #f8f9fa;
}

/* Badges */
.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-success { background: #d4edda; color: #155724; }
.badge-danger { background: #f8d7da; color: #721c24; }
.badge-warning { background: #fff3cd; color: #856404; }

/* Micro-animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        width: min(86vw, 320px);
        overflow-y: auto;
        box-shadow: var(--shadow-lg);
    }

    .nav-open .sidebar {
        transform: translateX(0);
    }

    .mobile-menu-toggle {
        display: inline-flex;
        position: fixed;
        top: max(12px, env(safe-area-inset-top));
        left: 12px;
        z-index: 220;
        width: 46px;
        height: 46px;
        align-items: center;
        justify-content: center;
        border: 0;
        border-radius: 12px;
        background: var(--primary-dark);
        color: #fff;
        box-shadow: var(--shadow);
        font-size: 1.55rem;
        line-height: 1;
    }

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        z-index: 90;
        background: rgba(15, 23, 42, 0.52);
    }

    .nav-open .sidebar-backdrop {
        display: block;
    }

    .main-content {
        margin-left: 0;
        padding: 76px 16px 24px;
        width: 100%;
        min-width: 0;
    }

    .page-header {
        align-items: flex-start;
        gap: 12px;
        flex-direction: column;
        margin-bottom: 20px;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .card {
        padding: 16px;
    }

    input,
    select,
    textarea {
        font-size: 16px;
    }
}

/* Nav sections */
.nav-links li.nav-section {
    padding: 14px 16px 4px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    pointer-events: none;
}

/* Tab system */
.tab-btns { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:24px; }
.tab-btn  { padding:10px 20px; border:2px solid var(--border); background:white; border-radius:8px; cursor:pointer; font-weight:600; font-size:0.9rem; transition:all 0.2s; }
.tab-btn.active { background:var(--primary); color:white; border-color:var(--primary); }
.tab-pane { display:none; }
.tab-pane.active { display:block; }

/* Login page */
.login-card {
    background: white;
    border-radius: 16px;
    padding: 48px 40px;
    width: 100%;
    max-width: 440px;
    margin: auto;
    box-shadow: var(--shadow-lg);
}
.login-card h2 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 8px;
    color: var(--secondary);
}
body:has(.login-card) {
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

/* Sheets */
.sheet-table { width:100%; border-collapse:collapse; font-size:0.82rem; }
.sheet-table th,.sheet-table td { border:1px solid #ccc; padding:6px 8px; white-space:nowrap; }
.sheet-table th { background:#f0f0f0; font-weight:700; text-align:center; }
.sheet-table input,.sheet-table select { width:100%; border:none; background:transparent; font-size:0.82rem; padding:2px 4px; }
.sheet-table input:focus { outline:2px solid var(--primary); border-radius:3px; }

/* Warning badge missing */
.badge-warning { background:#fff3cd; color:#856404; }

/* Print */
@media print {
    .no-print { display:none !important; }
    .sidebar  { display:none !important; }
    .main-content { margin-left:0 !important; padding:10px !important; }
}