:root {
    --primary-color: #1e88e5;
    --primary-dark: #1565c0;
    --primary-light: #64b5f6;
    --secondary-color: #5c6bc0;
    --success-color: #43a047;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --bg-body: #f4f6fa;
    --bg-white: #ffffff;
    --border-color: #e1e8ed;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-body);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--primary-color); text-decoration: none; transition: all 0.3s; }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    outline: none;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)); color: #fff; }
.btn-success { background: linear-gradient(135deg, #66bb6a, var(--success-color)); color: #fff; }
.btn-warning { background: linear-gradient(135deg, #ffa726, var(--warning-color)); color: #fff; }
.btn-danger { background: linear-gradient(135deg, #ef5350, var(--danger-color)); color: #fff; }
.btn-secondary { background: #bdc3c7; color: #fff; }
.btn-outline { border: 2px solid var(--primary-color); background: transparent; color: var(--primary-color); }
.btn-outline:hover { background: var(--primary-color); color: #fff; }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius-md); }
.btn-sm { padding: 6px 16px; font-size: 13px; }
.btn-block { width: 100%; }

.card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s;
}
.card:hover { box-shadow: var(--shadow-md); }
.card-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 16px;
    color: var(--text-primary);
}
.card-body { padding: 24px; }
.card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background: #fafbfc;
}

.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-primary);
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: all 0.3s;
    outline: none;
    background: #fff;
}
.form-control:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(30,136,229,0.15); }
select.form-control { appearance: auto; }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}
.table th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.table tr:hover { background: #f8fafc; }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}
.badge-primary { background: rgba(30,136,229,0.12); color: var(--primary-color); }
.badge-success { background: rgba(67,160,71,0.12); color: var(--success-color); }
.badge-warning { background: rgba(243,156,18,0.12); color: var(--warning-color); }
.badge-danger { background: rgba(231,76,60,0.12); color: var(--danger-color); }

.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.text-primary { color: var(--primary-color); }
.text-danger { color: var(--danger-color); }
.text-success { color: var(--success-color); }
.mt-2 { margin-top: 10px; }
.mt-3 { margin-top: 16px; }
.mt-4 { margin-top: 24px; }
.mb-3 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 24px; }
.p-3 { padding: 16px; }
.p-4 { padding: 24px; }
.rounded { border-radius: var(--radius-sm); }
.w-100 { width: 100%; }

.row { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.col-1,.col-2,.col-3,.col-4,.col-5,.col-6,
.col-7,.col-8,.col-9,.col-10,.col-11,.col-12,
.col-md-3,.col-md-4,.col-md-6,.col-md-8,.col-md-9,.col-md-10,.col-md-12 {
    padding: 0 12px;
}
.col-12 { width: 100%; }
.col-6 { width: 50%; }
.col-4 { width: 33.333%; }
.col-3 { width: 25%; }
@media (min-width: 768px) {
    .col-md-3 { width: 25%; }
    .col-md-4 { width: 33.333%; }
    .col-md-6 { width: 50%; }
    .col-md-8 { width: 66.666%; }
    .col-md-9 { width: 75%; }
    .col-md-10 { width: 83.333%; }
    .col-md-12 { width: 100%; }
}