/* static/css/kids_style.css - 儿童友好风格
   由 base.html 在 session 样式为 kids 时加载，负责全站明亮活泼主题。 */

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 明亮欢快的颜色 */
    --color-primary: #FF6B8B;    /* 粉色 */
    --color-secondary: #4ECDC4;  /* 青色 */
    --color-accent: #FFD166;     /* 黄色 */
    --color-success: #06D6A0;    /* 绿色 */
    --color-warning: #FF9E6D;    /* 橙色 */
    
    /* 柔和背景色 */
    --bg-light: #F8F9FF;
    --bg-card: #FFFFFF;
    --bg-gradient: linear-gradient(135deg, #FFECD2 0%, #FCB69F 100%);
    
    /* 文字颜色 */
    --text-primary: #5D5FEF;
    --text-secondary: #6C63FF;
    --text-light: #A5A6F6;
    
    /* 圆角 */
    --radius-big: 20px;
    --radius-medium: 15px;
    --radius-small: 10px;
    
    /* 阴影 */
    --shadow-soft: 0 8px 25px rgba(0,0,0,0.1);
    --shadow-lift: 0 12px 35px rgba(0,0,0,0.15);
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
}

body {
    font-family: 'Comic Sans MS', '楷体', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 样式切换器 */
.style-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.style-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-big);
    font-weight: bold;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
    border: 3px solid white;
}

.style-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-lift);
}

/* 头部样式 */
.navbar {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    padding: 15px 0;
    box-shadow: var(--shadow-soft);
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 2rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.nav-icon {
    font-size: 2.5rem;
    animation: bounce 2s infinite;
}

.nav-links {
    display: flex;
    gap: 15px;
    align-items: center;
}

.nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 20px;
    background: rgba(255,255,255,0.9);
    border-radius: var(--radius-big);
    text-decoration: none;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    min-width: 80px;
}

.nav-link:hover,
.nav-link.active {
    transform: translateY(-5px) scale(1.05);
    background: white;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lift);
}

/* 主要内容区域 */
.main-content {
    position: relative;
    min-height: calc(100vh - 140px);
    padding: 30px 0;
}

/* 云朵背景效果 */
body.kids-style::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.3) 2%, transparent 2%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.3) 3%, transparent 3%),
        radial-gradient(circle at 40% 70%, rgba(255,255,255,0.3) 4%, transparent 4%);
    background-size: 200px 200px;
    pointer-events: none;
    z-index: -1;
}

/* 太阳动画 */
body.kids-style::after {
    content: '';
    position: fixed;
    top: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 30px var(--color-accent);
    animation: rotate 20s linear infinite;
    z-index: -1;
}

/* 卡片样式 - 儿童友好 */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-big);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--shadow-soft);
    border: 3px solid white;
    position: relative;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lift);
}

.card::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border-radius: var(--radius-big);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    z-index: -1;
    opacity: 0.3;
}

.card-header {
    border-bottom: 3px dashed var(--color-accent);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-md);
}

/* 按钮样式 - 大而可爱 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px 30px;
    border: none;
    border-radius: var(--radius-big);
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    position: relative;
    overflow: hidden;
    min-width: 120px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    background: #FF4D7A;
    transform: scale(1.05);
}

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

.btn-secondary:hover {
    background: #3DBBB4;
    transform: scale(1.05);
}

.btn-accent {
    background: var(--color-accent);
    color: #333;
}

.btn-accent:hover {
    background: #FFC84D;
    transform: scale(1.05);
}

.btn-sm {
    padding: 10px 20px;
    font-size: 1rem;
    min-width: 100px;
}

.btn-lg {
    padding: 20px 40px;
    font-size: 1.4rem;
    min-width: 150px;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 3px solid var(--color-primary);
}

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

/* 表单样式 */
.form-group {
    margin-bottom: 25px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.form-control {
    width: 100%;
    padding: 15px 20px;
    border: 3px solid var(--color-accent);
    border-radius: var(--radius-medium);
    font-size: 1.1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(255,107,139,0.3);
    transform: scale(1.02);
}

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

/* 音频播放器美化 */
.audio-player {
    width: 100%;
    margin: 20px 0;
    border-radius: var(--radius-medium);
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    border: 3px solid var(--color-secondary);
}

/* 视频播放器样式 */
.video-player {
    width: 100%;
    border-radius: var(--radius-medium);
    border: 5px solid var(--color-accent);
    box-shadow: var(--shadow-lift);
}

.video-container {
    position: relative;
    margin: 20px 0;
    border-radius: var(--radius-medium);
    overflow: hidden;
}

/* 消息提示 */
.flash-messages {
    margin-bottom: var(--space-md);
}

.alert {
    padding: var(--space-md);
    border-radius: var(--radius-medium);
    margin-bottom: var(--space-sm);
    font-weight: bold;
    font-size: 1.1rem;
    border: 3px solid transparent;
}

.alert-success {
    background: #E8F5E8;
    color: var(--color-success);
    border-color: var(--color-success);
}

/* 链接 */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: bold;
    margin-bottom: var(--space-md);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.back-link:hover {
    color: #FF4D7A;
    gap: 12px;
}

/* 网格布局 */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* 页脚样式 */
.footer {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    padding: 30px 0;
    text-align: center;
    color: white;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    padding: var(--space-xl) 0;
}

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: var(--space-sm);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.footer-section p {
    color: rgba(255,255,255,0.9);
    line-height: 1.6;
}

.footer-link {
    display: block;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    margin-bottom: var(--space-xs);
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: white;
    transform: translateX(5px);
}

.footer-bottom {
    border-top: 2px solid rgba(255,255,255,0.3);
    padding: var(--space-md) 0;
    text-align: center;
    color: rgba(255,255,255,0.8);
}

/* 动画定义 */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes wiggle {
    0%, 7% {
        transform: rotateZ(0);
    }
    15% {
        transform: rotateZ(-15deg);
    }
    20% {
        transform: rotateZ(10deg);
    }
    25% {
        transform: rotateZ(-10deg);
    }
    30% {
        transform: rotateZ(6deg);
    }
    35% {
        transform: rotateZ(-4deg);
    }
    40%, 100% {
        transform: rotateZ(0);
    }
}

/* 特殊效果类 */
.wiggle {
    animation: wiggle 2s linear infinite;
}

.bounce {
    animation: bounce 2s infinite;
}

.float {
    animation: float 3s ease-in-out infinite;
}

/* 工具类 */
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-lg); }

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-brand {
        font-size: 1.5rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        min-width: 70px;
        padding: 10px 15px;
    }
    
    .style-switcher {
        position: static;
        text-align: center;
        margin-bottom: 20px;
    }
    
    .style-btn {
        display: inline-flex;
        margin: 0 auto;
    }
    
    body.kids-style::after {
        width: 40px;
        height: 40px;
        top: 20px;
        right: 20px;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}