/* style.css - 青少年网络安全赛事平台主样式文件 */

/* ========== CSS变量和重置 ========== */
:root {
    /* 主色调 */
    --primary: #2c6fbb;
    --secondary: #4a90e2;
    --accent: #ff6b6b;
    --light: #f8f9fa;
    --dark: #343a40;
    --success: #28a745;
    --warning: #ffc107;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    
    /* 设计变量 */
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
    --container-width: 1200px;
}

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

body {
    font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: #f5f7fa;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 通用组件样式 ========== */
.section-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-bottom: 30px;
    transition: var(--transition);
}

.section-card:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.section-title {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
}

.section-title i {
    font-size: 1.5rem;
    color: var(--primary);
    margin-right: 12px;
    width: 32px;
    text-align: center;
}

.section-title h2 {
    font-size: 1.5rem;
    color: var(--dark);
    font-weight: 600;
}

/* ========== 布局样式 ========== */
.main-content {
    display: flex;
    gap: 30px;
    margin: 30px 0;
    min-height: 600px;
}

.content-section {
    flex: 3;
    min-width: 0; /* 防止flex元素溢出 */
}

.sidebar {
    flex: 1;
    min-width: 280px;
}

/* ========== 模块网格样式 ========== */
.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.module-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    transition: var(--transition);
    border-top: 4px solid var(--primary);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.module-card:hover::before {
    transform: scaleX(1);
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.module-card h3 {
    font-size: 1.25rem;
    margin-bottom: 18px;
    color: var(--primary);
    font-weight: 600;
    display: flex;
    align-items: center;
}

.module-card h3 i {
    margin-right: 10px;
    font-size: 1.1rem;
}

.module-card ul {
    padding-left: 20px;
    margin-bottom: 20px;
    flex-grow: 1;
}

.module-card li {
    margin-bottom: 10px;
    color: var(--dark);
    line-height: 1.5;
    position: relative;
}

.module-card li::marker {
    color: var(--primary);
}

.module-card strong {
    color: var(--primary);
    font-weight: 600;
}

.module-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    font-weight: 500;
    text-decoration: none;
    padding: 8px 16px;
    background-color: rgba(44, 111, 187, 0.1);
    border-radius: 4px;
    transition: var(--transition);
    margin-top: auto;
    align-self: flex-start;
}

.module-link:hover {
    background-color: rgba(44, 111, 187, 0.2);
    color: var(--primary-dark);
}

.module-link i {
    margin-left: 8px;
    transition: transform 0.3s ease;
}

.module-link:hover i {
    transform: translateX(4px);
}

/* ========== 工具类 ========== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

.bg-primary { background-color: var(--primary); }
.bg-secondary { background-color: var(--secondary); }
.bg-light { background-color: var(--light); }
.bg-dark { background-color: var(--dark); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }
.p-5 { padding: 3rem; }

.d-flex { display: flex; }
.d-none { display: none; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }

/* ========== 加载状态 ========== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(44, 111, 187, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

/* ========== 空状态 ========== */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--light-gray);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--gray);
}

.empty-state p {
    margin-bottom: 20px;
}

/* ========== 消息提示 ========== */
.alert {
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    border: 1px solid rgba(40, 167, 69, 0.2);
    color: var(--success);
}

.alert-warning {
    background-color: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.2);
    color: var(--warning);
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.2);
    color: var(--danger);
}

.alert-info {
    background-color: rgba(23, 162, 184, 0.1);
    border: 1px solid rgba(23, 162, 184, 0.2);
    color: var(--info);
}

.alert i {
    margin-right: 10px;
    font-size: 1.2rem;
}

.alert .close-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 1.2rem;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.alert .close-btn:hover {
    opacity: 1;
}

/* ========== 按钮样式 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: 4px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    gap: 8px;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 111, 187, 0.3);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}

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

.btn-outline-primary {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-sm {
    padding: 6px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ========== 表格样式 ========== */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

.table th {
    background-color: var(--light);
    font-weight: 600;
    color: var(--dark);
}

.table tbody tr:hover {
    background-color: rgba(44, 111, 187, 0.05);
}

.table-striped tbody tr:nth-child(odd) {
    background-color: var(--light);
}

/* ========== 表单样式 ========== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(44, 111, 187, 0.1);
}

.form-control:disabled {
    background-color: var(--light);
    cursor: not-allowed;
}

.form-text {
    display: block;
    margin-top: 5px;
    font-size: 0.875rem;
    color: var(--gray);
}

/* ========== 卡片变体 ========== */
.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-bottom: 20px;
}

.card-header {
    padding-bottom: 15px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.25rem;
    color: var(--dark);
    font-weight: 600;
    margin: 0;
}

.card-body {
    padding: 0;
}

.card-footer {
    padding-top: 20px;
    margin-top: 20px;
    border-top: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ========== 标签样式 ========== */
.badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 20px;
}

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

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

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

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

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

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

/* ========== 页面过渡动画 ========== */
.page-transition-enter {
    opacity: 0;
    transform: translateY(20px);
}

.page-transition-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s, transform 0.3s;
}

.page-transition-exit {
    opacity: 1;
    transform: translateY(0);
}

.page-transition-exit-active {
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity 0.3s, transform 0.3s;
}

/* ========== 响应式工具类 ========== */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }

@media (min-width: 768px) {
    .d-md-none { display: none; }
    .d-md-block { display: block; }
    .d-md-inline { display: inline; }
    .d-md-inline-block { display: inline-block; }
}

@media (min-width: 992px) {
    .d-lg-none { display: none; }
    .d-lg-block { display: block; }
    .d-lg-inline { display: inline; }
    .d-lg-inline-block { display: inline-block; }
}

/* ========== 打印样式 ========== */
@media print {
    .no-print { display: none !important; }
    
    body {
        background-color: white !important;
        color: black !important;
    }
    
    .section-card, .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
    
    .module-link, .btn {
        display: none !important;
    }
}