@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #8150dc;
    --primary-hover: #b47ff5;
    --secondary-color: #f8f9fa;
    --accent-color: #e9ecef;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
}

* {
    font-family: 'Sarabun', sans-serif;
}

body {
    background: linear-gradient(135deg, #f7f8fb 0%, #ad69f2 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

.main-container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin: 20px 0;
    padding: 30px;
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-radius: 15px 15px 0 0 !important;
    border: none;
    padding: 20px;
}

.btn {
    border-radius: 25px;
    padding: 10px 25px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), #4a1d7a);
    transform: translateY(-1px);
    box-shadow: 0 5px 15px rgba(111, 66, 193, 0.4);
}

.btn-outline-primary {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.form-control {
    border-radius: 10px;
    border: 2px solid #e9ecef;
    padding: 12px 15px;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(111, 66, 193, 0.25);
}

.form-select {
    border-radius: 10px;
    border: 2px solid #e9ecef;
    padding: 12px 15px;
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(111, 66, 193, 0.25);
}

.navbar {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95) !important;
    border-bottom: 1px solid rgba(111, 66, 193, 0.1);
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color) !important;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.table {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.table th {
    background: var(--primary-color);
    color: white;
    border: none;
    font-weight: 600;
}

.table td {
    vertical-align: middle;
    border-color: #f1f3f4;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(111, 66, 193, 0.05);
}

.badge {
    border-radius: 20px;
    padding: 8px 12px;
    font-weight: 500;
}

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

.badge-success {
    background: var(--success-color);
}

.badge-warning {
    background: var(--warning-color);
}

.badge-danger {
    background: var(--danger-color);
}

.alert {
    border-radius: 10px;
    border: none;
    padding: 15px 20px;
}

.stats-card {
    background: linear-gradient(135deg, #ececed 0%, #b072ee 100%);
    color: white;
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    transition: transform 0.3s ease;
}

.stats-card:hover {
    transform: translateY(-3px);
}

.stats-card .stats-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.stats-card .stats-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

.file-upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    background: rgba(111, 66, 193, 0.05);
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-upload-area:hover {
    background: rgba(111, 66, 193, 0.1);
    border-color: var(--primary-hover);
}

.file-upload-area.dragover {
    background: rgba(111, 66, 193, 0.15);
    border-color: var(--primary-hover);
}

.progress {
    height: 10px;
    border-radius: 5px;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
}

.sidebar {
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    padding: 20px;
    margin-bottom: 20px;
}

.sidebar .nav-link {
    border-radius: 10px;
    margin: 5px 0;
    padding: 12px 15px;
    color: var(--dark-color);
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background: var(--primary-color);
    color: white;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
    padding: 40px;
    min-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header .logo {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.exam-card {
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.exam-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
}

.exam-card .exam-id {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.chart-container {
    position: relative;
    height: 400px;
    margin: 20px 0;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(111, 66, 193, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.text-primary {
    color: var(--primary-color) !important;
}

.bg-primary {
    background: var(--primary-color) !important;
}

.border-primary {
    border-color: var(--primary-color) !important;
}

@media (max-width: 768px) {
    .main-container {
        margin: 10px;
        padding: 20px;
        border-radius: 10px;
    }
    
    .login-card {
        margin: 20px;
        padding: 30px 20px;
        min-width: auto;
    }
    
    .stats-card .stats-number {
        font-size: 2rem;
    }
    
    .table-responsive {
        border-radius: 10px;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: 8px 20px;
        font-size: 0.9rem;
    }
    
    .file-upload-area {
        padding: 30px 20px;
    }
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label,
.form-floating > .form-select ~ label {
    color: var(--primary-color);
}

.form-floating > .form-control:focus ~ label::after,
.form-floating > .form-select:focus ~ label::after {
    background-color: white;
}

.invalid-feedback {
    display: block;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 5px;
}

.was-validated .form-control:invalid {
    border-color: var(--danger-color);
}

.was-validated .form-control:valid {
    border-color: var(--success-color);
}