/* ===== DIEM DANH STYLE SHEET ===== */
/* Tông màu: Trắng đen + Xanh lá nhạt */

:root {
    --primary-dark: #2c3e50;
    --primary-light: #34495e;
    --accent-green: #27ae60;
    --accent-green-light: #2ecc71;
    --accent-green-pale: #e8f5e8;
    --background-overlay: rgba(255, 255, 255, 0.85);
    --card-background: rgba(255, 255, 255, 0.98);
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #e8f5e8;
    --shadow-light: rgba(0, 0, 0, 0.08);
    --shadow-green: rgba(39, 174, 96, 0.2);
}

/* ===== BACKGROUND ===== */
body {
    background: url('diemdanh_background.jpg') center center fixed;
    background-size: cover;
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--background-overlay);
    z-index: -1;
}

/* ===== MAIN CONTAINER ===== */
.main-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.admin-container {
    padding: 20px;
}

/* ===== CARDS ===== */
.card {
    border: 2px solid var(--border-color);
    border-radius: 15px;
    box-shadow: 0 8px 25px var(--shadow-light);
    backdrop-filter: blur(10px);
    background: var(--card-background);
    margin-bottom: 20px;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: 13px 13px 0 0 !important;
    text-align: center;
    padding: 2rem;
    border-bottom: 3px solid var(--accent-green);
}

.card-title {
    font-size: 2rem;
    font-weight: bold;
    margin: 0;
    color: white;
}

.card-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: 0.5rem;
    color: white;
}

/* ===== FORMS ===== */
.form-control {
    border-radius: 10px;
    border: 2px solid var(--border-color);
    padding: 15px 20px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    background: #fafafa;
}

.form-control:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 0.2rem var(--shadow-green);
    background: white;
}

.form-label {
    color: var(--text-dark);
    font-weight: bold;
}

/* ===== BUTTONS ===== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
    border: 2px solid var(--accent-green);
    border-radius: 10px;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-light) 100%);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-green);
    color: white;
}

.btn-outline-primary {
    border-color: var(--accent-green);
    color: var(--accent-green);
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.btn-success {
    background-color: var(--accent-green);
    border-color: var(--accent-green);
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-success:hover {
    background-color: var(--accent-green-light);
    border-color: var(--accent-green-light);
}

.btn-warning {
    background-color: #f39c12;
    border-color: #f39c12;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-warning:hover {
    background-color: #e67e22;
    border-color: #e67e22;
}

/* ===== CAMERA CONTAINER ===== */
.camera-container {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    background: #f8f9fa;
    border: 2px dashed var(--accent-green);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.camera-container:hover {
    border-color: var(--accent-green-light);
    background: #f0f8f0;
}

.camera-placeholder {
    text-align: center;
    color: var(--accent-green);
}

.camera-placeholder i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: var(--accent-green);
}

.camera-controls {
    margin-top: 1rem;
}

.btn-camera {
    margin: 0 5px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

/* ===== ALERTS ===== */
.alert {
    border-radius: 10px;
    border: none;
    font-weight: 500;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border: 1px solid var(--accent-green);
    border-radius: 10px;
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    color: #721c24;
    border: 1px solid #e74c3c;
    border-radius: 10px;
}

/* ===== MODAL ===== */
.modal-content {
    border-radius: 20px;
    border: none;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: 20px 20px 0 0;
    border-bottom: 3px solid var(--accent-green);
}

.success-icon {
    font-size: 4rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
}

/* ===== ADMIN SPECIFIC ===== */
.stats-card {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-light) 100%);
    color: white;
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 20px;
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 15px var(--shadow-green);
}

.stats-card.warning {
    background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
    border-color: #f39c12;
}

.stats-card.danger {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    border-color: #e74c3c;
}

.student-card {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
    transition: all 0.3s ease;
    background: #fafafa;
}

.student-card.attended {
    border-color: var(--accent-green);
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
}

.student-card.not-attended {
    border-color: #e74c3c;
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
}

.student-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-light);
}

.status-badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.status-attended {
    background: var(--accent-green);
    color: white;
}

.status-not-attended {
    background: #e74c3c;
    color: white;
}

.date-filter {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px var(--shadow-light);
    border: 2px solid var(--border-color);
}

.back-btn {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
    border: 2px solid var(--accent-green);
    color: white;
    padding: 10px 20px;
    border-radius: 10px;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-light) 100%);
    border-color: var(--primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-green);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .card-header {
        padding: 1.5rem;
    }
    
    .card-title {
        font-size: 1.5rem;
    }
    
    .camera-container {
        min-height: 250px;
    }
    
    .summary-stats {
        grid-template-columns: 1fr;
    }
    
    .attendance-image {
        width: 60px;
        height: 60px;
    }
}

/* ===== UTILITIES ===== */
.text-primary {
    color: var(--accent-green) !important;
}

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

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