:root {
    --primary: #f97316;
    --primary-hover: #ea580c;
    --bg-dark: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: #1e293b;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #22c55e;
    --danger: #ef4444;
}

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

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

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    flex-shrink: 0;
}

.brand {
    padding: 0 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 2rem;
}

.nav-link {
    padding: 1rem 1.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.05);
    color: var(--text);
}

.nav-link.active {
    color: var(--primary);
    background-color: rgba(249, 115, 22, 0.1);
    border-left-color: var(--primary);
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

/* Dashboard Cards */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
}

.stat-title {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-transform: uppercase;
    font-weight: 600;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 0.5rem;
    color: var(--primary);
}

/* Tables */
.card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border);
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

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

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

th {
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
}

tr:hover {
    background-color: rgba(255,255,255,0.02);
}

/* Forms & Buttons */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

input[type="text"], input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 0.5rem;
}

input[type="text"]:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
}

.btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
}

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

.btn-secondary:hover {
    background-color: #475569;
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-pending {
    background-color: rgba(249, 115, 22, 0.1);
    color: var(--primary);
}

.badge-completed {
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        flex-direction: row;
        padding: 0;
        border-right: none;
        border-bottom: 1px solid var(--border);
        overflow-x: auto;
        white-space: nowrap;
        background-color: var(--bg-dark);
        z-index: 10;
    }

    .brand {
        padding: 1rem;
        margin-bottom: 0;
        display: flex;
        align-items: center;
    }

    .nav-link {
        padding: 1rem;
        border-left: none;
        border-bottom: 3px solid transparent;
    }

    .nav-link.active {
        border-left: none;
        border-bottom-color: var(--primary);
        background-color: transparent;
    }

    .main-content {
        padding: 1rem;
        padding-bottom: 4rem; /* Extra padding for scrolling */
    }

    h2 {
        font-size: 1.5rem;
    }

    .grid-cards {
        grid-template-columns: 1fr;
    }

    /* Stack form grids */
    div[style*="grid-template-columns"] {
        grid-template-columns: 1fr !important;
    }
    
    /* Responsive Buttons */
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .btn-small {
        width: auto;
    }
    
    /* Make tables slightly more compact on mobile */
    th, td {
        padding: 0.75rem;
    }
}