:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --dark: #1a1a2e;
    --light: #f8f9fa;
    --success: #2ec4b6;
    --warning: #ff9f1c;
    --danger: #e71d36;
    --text: #ffffff;
    --bg: #16213e;
    --card-bg: #0f3460;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: var(--bg);
    color: var(--text);
}

.wrapper { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: 250px;
    background: var(--dark);
    padding: 20px;
    transition: 0.3s;
}
.sidebar nav ul { list-style: none; padding: 0; }
.sidebar nav ul li { margin: 15px 0; }
.sidebar nav ul li a {
    color: #aaa;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: 0.3s;
}
.sidebar nav ul li a:hover { color: var(--primary); }

/* Main Content */
.main-content { flex: 1; padding: 20px; }
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

/* Cards */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}
.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    position: relative;
}
.card i { position: absolute; right: 20px; top: 20px; font-size: 2rem; opacity: 0.2; }
.card .value { font-size: 1.5rem; font-weight: bold; color: var(--primary); }

/* Tables */
.modern-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
}
.modern-table th, .modern-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #1a1a2e;
}
.modern-table th { background: #0f3460; color: var(--primary); }
.row-warning { background: rgba(255, 159, 28, 0.1); }

/* Forms */
.modern-form { background: var(--card-bg); padding: 20px; border-radius: 8px; max-width: 600px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; }
.form-group input, .form-group select {
    width: 100%; padding: 10px;
    background: var(--dark); border: 1px solid #333;
    color: #fff; border-radius: 4px;
}

/* Buttons */
.btn-primary { background: var(--primary); color: #fff; padding: 10px 20px; text-decoration: none; border: none; border-radius: 4px; cursor: pointer; }
.btn-success { background: var(--success); color: #fff; padding: 10px 20px; border: none; border-radius: 4px; cursor: pointer; }
.btn-logout { color: var(--danger); text-decoration: none; margin-left: 15px; }