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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

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

.header {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 2.5em;
    color: #667eea;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.header p {
    color: #666;
    font-size: 1.1em;
}

.grade-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.grade-tab {
    padding: 12px 30px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    color: #555;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.grade-tab:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.grade-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.notice-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.notice-section h2 {
    color: #667eea;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
    display: flex;
    align-items: center;
    gap: 10px;
}

.notice-section h2::before {
    content: '📢';
}

.notice-list {
    display: grid;
    gap: 15px;
}

.notice-item {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 20px;
    border-radius: 12px;
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
}

.notice-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.notice-item h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.notice-item p {
    color: #666;
    line-height: 1.6;
}

.notice-item .date {
    color: #999;
    font-size: 0.85em;
    margin-top: 10px;
}

.notice-item img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    margin-top: 10px;
}

.students-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.students-section h2 {
    color: #667eea;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
    display: flex;
    align-items: center;
    gap: 10px;
}

.students-section h2::before {
    content: '👥';
}

.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.student-card {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

.student-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.student-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 4px solid #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.student-avatar-placeholder {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5em;
    color: white;
    border: 4px solid #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.student-name {
    font-size: 1.2em;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.student-desc {
    color: #666;
    font-size: 0.9em;
    line-height: 1.4;
}

.footer {
    text-align: center;
    padding: 30px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 30px;
}

.footer a {
    color: white;
    text-decoration: none;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    transition: all 0.3s ease;
}

.footer a:hover {
    background: rgba(255, 255, 255, 0.3);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 30px;
    padding: 20px;
}

.pagination button,
.pagination a {
    padding: 10px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95em;
    transition: all 0.3s ease;
    text-decoration: none;
}

.pagination button:hover,
.pagination a:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.pagination button:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.pagination .page-info {
    color: #666;
    font-size: 0.95em;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state::before {
    content: '📭';
    font-size: 4em;
    display: block;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8em;
    }
    
    .grade-tab {
        padding: 10px 20px;
        font-size: 0.9em;
    }
    
    .students-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

.admin-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

.admin-header {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px 30px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.admin-header h1 {
    color: #667eea;
    font-size: 1.5em;
}

.admin-header .logout {
    padding: 8px 20px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
}

.admin-header .logout:hover {
    background: #ee5a5a;
}

.admin-nav {
    display: flex;
    gap: 15px;
}

.admin-nav a {
    padding: 10px 25px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #555;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.admin-nav a:hover,
.admin-nav a.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.admin-content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1em;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: #667eea;
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(46, 204, 113, 0.4);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.data-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 500;
}

.data-table tr:hover {
    background: #f8f9fa;
}

.data-table img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
}

.action-btns {
    display: flex;
    gap: 8px;
}

.action-btns .btn {
    padding: 6px 15px;
    font-size: 0.85em;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.login-container h1 {
    text-align: center;
    color: #667eea;
    margin-bottom: 30px;
}

.login-container .logo {
    text-align: center;
    font-size: 4em;
    margin-bottom: 20px;
}

.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.image-preview {
    max-width: 200px;
    max-height: 150px;
    border-radius: 10px;
    margin-top: 10px;
}

.file-input-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.file-input-wrapper input[type=file] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.file-input-label {
    display: inline-block;
    padding: 12px 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-input-label:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}