:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #0f172a;
    --light: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: #f1f5f9;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: var(--primary-hover);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 16px;
    width: 100%;
}

/* Navbar */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}
.navbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 16px;
}
.navbar-brand {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}
.navbar-brand span {
    color: var(--primary);
}
.navbar-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Card */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 24px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}
.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-hover);
    color: white;
}
.btn-secondary {
    background: #e2e8f0;
    color: var(--dark);
}
.btn-secondary:hover {
    background: #cbd5e1;
}
.btn-success {
    background: var(--success);
    color: white;
}
.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-outline {
    background: transparent;
    border-color: var(--border);
    color: var(--text-main);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* Forms */
.form-group {
    margin-bottom: 18px;
}
.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--dark);
}
.form-control, .form-select, textarea {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text-main);
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus, .form-select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    outline: none;
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

/* Stepper Wizard */
.stepper {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    background: var(--surface);
    padding: 18px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow-x: auto;
}
.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 90px;
    position: relative;
    cursor: pointer;
}
.step-circle {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #e2e8f0;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 8px;
    transition: all 0.3s;
}
.step-item.active .step-circle {
    background: var(--primary);
    color: white;
    box-shadow: 0 0 0 4px var(--primary-light);
}
.step-item.completed .step-circle {
    background: var(--success);
    color: white;
}
.step-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    white-space: nowrap;
}
.step-item.active .step-label {
    color: var(--primary);
}

/* Table */
.table-responsive {
    overflow-x: auto;
}
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}
.table th, .table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.table th {
    background: #f8fafc;
    font-weight: 700;
    color: var(--dark);
}
.table tr:hover {
    background-color: #f8fafc;
}
.table .text-center {
    text-align: center;
}
.table .text-right {
    text-align: right;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger  { background: #fee2e2; color: #991b1b; }
.badge-info    { background: #e0f2fe; color: #075985; }

/* Alerts */
.alert {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 12px;
}
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-info    { background: #f0f9ff; color: #075985; border: 1px solid #bae6fd; }

/* Grid / Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--surface);
    padding: 22px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}
.stat-card .label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}
.stat-card .value {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--dark);
    margin: 8px 0 4px 0;
}
.stat-card .sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Footer */
footer {
    margin-top: auto;
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}