:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --accent: #8b5cf6;
    --background: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --input-bg: rgba(15, 23, 42, 0.5);
}

body.light-mode {
    --background: #f4f3ef; /* Warm Paper tone */
    --card-bg: rgba(255, 255, 255, 0.65);
    --text-main: #334155;
    --text-muted: #64748b;
    --glass-border: rgba(0, 0, 0, 0.05);
    --glass-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    --input-bg: rgba(255, 255, 255, 0.8);
}

body.light-mode {
    background-image: none !important;
    background-color: var(--background) !important;
}

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

body {
    background: var(--background);
    background-image: 
        radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%), 
        radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);
    transition: all 0.4s ease;
    color: var(--text-main);
    min-height: 100vh;
    line-height: 1.6;
}

body.light-mode {
    background-image: none !important;
    background-color: var(--background) !important;
    color: var(--text-main) !important;
}

/* Glassmorphism components */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    box-shadow: var(--glass-shadow);
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

/* Login Page Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    text-align: center;
}

.login-logo {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

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

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    color: var(--text-main);
    outline: none;
    transition: all 0.3s;
}

.form-input:focus {
    border-color: var(--primary);
}

/* Dashboard Styles */
.dashboard-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    min-height: 100vh;
}

.sidebar {
    padding: 2rem 1.5rem;
    border-right: 1px solid var(--glass-border);
}

.main-content {
    padding: 2rem;
    overflow-y: auto;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    transition: all 0.3s;
}

.nav-link:hover, .nav-link.active {
    background: rgba(99, 102, 241, 0.1);
    color: white;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    padding: 1.5rem;
}

.stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Table Styles */
.table-container {
    width: 100%;
    overflow-x: auto;
}

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

th {
    text-align: left;
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-weight: 600;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-pending { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-approved { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-rejected { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

@media (max-width: 768px) {
    .dashboard-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        display: none;
    }
}