/* =====================================================
   凯乐昊教育中心 - 全局统一主题样式库
   版本: 2.0  设计风格: 渐变动态背景 + 玻璃态
   ===================================================== */

/* ---------- CSS 变量 ---------- */
:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --accent: #23a6d5;
    --accent2: #23d5ab;
    --white: #fff;
    --text: #333;
    --text-light: #666;
    --text-muted: #999;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --radius-sm: 8px;
    --radius-md: 15px;
    --radius-lg: 20px;
    --radius-xl: 25px;
    --shadow-sm: 0 5px 20px rgba(102,126,234,0.10);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.12);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
    --glass-bg: linear-gradient(135deg, rgba(255,255,255,0.95) 0%, rgba(240,248,255,0.95) 100%);
    --glass-border: 1px solid rgba(255,255,255,0.8);
    --transition: all 0.3s ease;
    --transition-bounce: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

/* ---------- 全局 body 动态渐变背景 ---------- */
body {
    font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: klhGradientBg 15s ease infinite;
    overflow-x: hidden;
}

@keyframes klhGradientBg {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 背景粒子装饰 */
body::before {
    content: '';
    position: fixed;
    top: -50%; right: -50%;
    width: 100%; height: 100%;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

/* ---------- 通用容器 ---------- */
.klh-container, .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
    position: relative;
    z-index: 1;
}

/* ---------- 顶部导航 ---------- */
.klh-header, .site-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 16px 0;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.klh-header .header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.klh-logo-link, .logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.klh-logo-link:hover, .logo-link:hover { transform: scale(1.05); }

.klh-logo-img, .logo-img {
    width: 50px; height: 50px;
    border-radius: 50%;
    padding: 4px;
    margin-right: 12px;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.1) 100%);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    transition: var(--transition-bounce);
    animation: klhLogoPulse 3s ease-in-out infinite;
}
.klh-logo-link:hover .klh-logo-img,
.logo-link:hover .logo-img {
    box-shadow: 0 12px 30px rgba(102,126,234,0.4);
    transform: scale(1.1) rotate(5deg);
}

@keyframes klhLogoPulse {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(1.03); }
}

.klh-logo-text, .logo {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
    transition: var(--transition);
}
.klh-logo-link:hover .klh-logo-text,
.logo-link:hover .logo {
    letter-spacing: 1px;
}

/* ---------- 主体内容区 ---------- */
.klh-main { position: relative; z-index: 1; }

/* ---------- 玻璃卡片 ---------- */
.klh-card, .klh-section {
    background: var(--glass-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    border: var(--glass-border);
    padding: 40px 50px;
    margin: 30px 0;
}

.klh-card-sm {
    background: var(--glass-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    border: var(--glass-border);
    padding: 25px 30px;
    margin: 20px 0;
    transition: var(--transition-bounce);
}
.klh-card-sm:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

/* ---------- 区块标题 ---------- */
.klh-section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    text-align: center;
    margin-bottom: 10px;
}
.klh-section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.05rem;
    margin-bottom: 35px;
}
.klh-section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 2px;
    margin: 12px auto 0;
}

/* ---------- 按钮 ---------- */
.klh-btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.klh-btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: 0 5px 15px rgba(102,126,234,0.3);
}
.klh-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102,126,234,0.5);
    color: var(--white);
}

.klh-btn-success {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: var(--white);
    box-shadow: 0 5px 15px rgba(40,167,69,0.3);
}
.klh-btn-success:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(40,167,69,0.5);
    color: var(--white);
}

.klh-btn-danger {
    background: linear-gradient(135deg, #dc3545, #c82333);
    color: var(--white);
}
.klh-btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(220,53,69,0.4);
    color: var(--white);
}

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

.klh-btn-lg { padding: 14px 32px; font-size: 1.05rem; border-radius: var(--radius-md); }
.klh-btn-sm { padding: 6px 16px; font-size: 0.85rem; }
.klh-btn-block { display: block; width: 100%; }

/* ---------- 表单 ---------- */
.klh-form-group { margin-bottom: 20px; }
.klh-form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text);
}
.klh-form-group input,
.klh-form-group select,
.klh-form-group textarea {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    background: rgba(255,255,255,0.9);
    transition: var(--transition);
    box-sizing: border-box;
}
.klh-form-group input:focus,
.klh-form-group select:focus,
.klh-form-group textarea:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
    background: #fff;
}

/* ---------- 提示信息 ---------- */
.klh-alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    font-size: 14px;
    font-weight: 500;
}
.klh-alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.klh-alert-error   { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.klh-alert-warning { background: #fff3cd; color: #856404; border: 1px solid #ffeeba; }
.klh-alert-info    { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }

/* ---------- 表格 ---------- */
.klh-table-wrap {
    background: var(--glass-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    border: var(--glass-border);
    overflow: hidden;
    margin: 20px 0;
}
.klh-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.klh-table thead tr {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
}
.klh-table thead th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}
.klh-table tbody tr {
    border-bottom: 1px solid rgba(102,126,234,0.08);
    transition: var(--transition);
}
.klh-table tbody tr:hover { background: rgba(102,126,234,0.06); }
.klh-table tbody td { padding: 12px 16px; }
.klh-table tbody tr:last-child { border-bottom: none; }

/* ---------- 标签/徽章 ---------- */
.klh-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}
.klh-badge-primary { background: rgba(102,126,234,0.15); color: var(--primary); }
.klh-badge-success { background: rgba(40,167,69,0.15); color: var(--success); }
.klh-badge-danger  { background: rgba(220,53,69,0.15); color: var(--danger); }
.klh-badge-warning { background: rgba(255,193,7,0.2); color: #856404; }

/* ---------- 页脚 ---------- */
.klh-footer, .site-footer {
    background: linear-gradient(135deg, rgba(102,126,234,0.05), rgba(118,75,162,0.05));
    color: var(--text-light);
    padding: 30px 0;
    text-align: center;
    border-top: 2px solid rgba(102,126,234,0.2);
    margin-top: 40px;
    position: relative;
    z-index: 1;
}
.klh-footer p, .site-footer p { margin: 8px 0; font-weight: 500; }
.klh-footer a, .site-footer a {
    color: var(--primary);
    text-decoration: none;
    margin: 0 12px;
    font-weight: 600;
    transition: var(--transition);
}
.klh-footer a:hover, .site-footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ---------- 加载动画 ---------- */
.klh-spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 24px; height: 24px;
    animation: klhSpin 0.8s linear infinite;
    display: inline-block;
}
@keyframes klhSpin {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ---------- 导航菜单 ---------- */
.klh-nav ul {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.klh-nav a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.95rem;
    font-weight: 500;
}
.klh-nav a:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .klh-card, .klh-section { padding: 25px 20px; }
    .klh-section-title { font-size: 1.6rem; }
    .klh-nav ul { flex-wrap: wrap; }
}