/* 全局变量 - 主题颜色 */
:root {
    /* 深色主题 */
    --dark-bg-primary: #0a0a0a;
    --dark-bg-secondary: #1a1a1a;
    --dark-bg-card: #242424;
    --dark-bg-card-hover: #2a2a2a;
    --dark-text-primary: #ffffff;
    --dark-text-secondary: #b0b0b0;
    --dark-text-tertiary: #808080;
    --dark-border-color: #333333;
    --dark-accent-primary: #ff6b6b;
    --dark-accent-secondary: #4ecdc4;
    --dark-accent-tertiary: #ffe66d;
    
    /* 浅色主题 */
    --light-bg-primary: #f8f9fa;
    --light-bg-secondary: #ffffff;
    --light-bg-card: #ffffff;
    --light-bg-card-hover: #f8f9fa;
    --light-text-primary: #212529;
    --light-text-secondary: #6c757d;
    --light-text-tertiary: #adb5bd;
    --light-border-color: #e9ecef;
    --light-accent-primary: #dc3545;
    --light-accent-secondary: #20c997;
    --light-accent-tertiary: #ffc107;
    
    /* 通用变量 */
    --transition-speed: 0.3s;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --backdrop-blur: blur(10px);
}

/* 主题切换 - 默认深色主题 */
:root {
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-card: var(--dark-bg-card);
    --bg-card-hover: var(--dark-bg-card-hover);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-tertiary: var(--dark-text-tertiary);
    --border-color: var(--dark-border-color);
    --accent-primary: var(--dark-accent-primary);
    --accent-secondary: var(--dark-accent-secondary);
    --accent-tertiary: var(--dark-accent-tertiary);
}

/* 浅色主题 */
[data-theme="light"] {
    --bg-primary: var(--light-bg-primary);
    --bg-secondary: var(--light-bg-secondary);
    --bg-card: var(--light-bg-card);
    --bg-card-hover: var(--light-bg-card-hover);
    --text-primary: var(--light-text-primary);
    --text-secondary: var(--light-text-secondary);
    --text-tertiary: var(--light-text-tertiary);
    --border-color: var(--light-border-color);
    --accent-primary: var(--light-accent-primary);
    --accent-secondary: var(--light-accent-secondary);
    --accent-tertiary: var(--light-accent-tertiary);
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-speed) var(--transition-ease),
                color var(--transition-speed) var(--transition-ease);
    min-height: 100vh;
}

/* 主题切换按钮 */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 26px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 26px;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 0 3px;
    transition: all var(--transition-speed) var(--transition-ease);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.theme-toggle::after {
    content: '';
    width: 20px;
    height: 20px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    transition: transform var(--transition-speed) var(--transition-ease);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    background-color: var(--bg-card);
    box-shadow: var(--shadow-md);
}

[data-theme="light"] .theme-toggle::after {
    transform: translateX(24px);
    background-color: var(--accent-tertiary);
}

/* 头部样式 */
.header {
    background-color: var(--bg-secondary);
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 107, 107, 0.1) 100%);
    pointer-events: none;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

.logo {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-primary);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-speed) var(--transition-ease);
}

.logo:hover {
    transform: scale(1.05);
}

.site-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin: 0;
}

.site-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 400;
}

/* 导航栏 */
.navigation {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: var(--backdrop-blur);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    gap: 12px;
    justify-content: center;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.nav-container::-webkit-scrollbar {
    height: 4px;
}

.nav-container::-webkit-scrollbar-track {
    background: transparent;
}

.nav-container::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

.nav-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all var(--transition-speed) var(--transition-ease);
    white-space: nowrap;
    font-weight: 500;
}

.nav-btn:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.nav-btn.active {
    background-color: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

/* 主内容 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 20px;
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    justify-items: center;
}

/* 卡片样式 */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    width: 100%;
    transition: all var(--transition-speed) var(--transition-ease);
    cursor: default;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    animation: cardSlideUp 0.5s var(--transition-ease);
}

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

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transform: scaleX(0);
    transition: transform var(--transition-speed) var(--transition-ease);
}

.card:hover {
    transform: translateY(-4px);
    background-color: var(--bg-card-hover);
    box-shadow: var(--shadow-lg);
}

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

/* 卡片头部 */
.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.card-type {
    font-weight: 600;
    font-size: 0.9rem;
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    background-color: rgba(255, 107, 107, 0.1);
    color: var(--accent-primary);
}

.card.confession .card-type {
    background-color: rgba(255, 107, 107, 0.1);
    color: var(--accent-primary);
}

.card.complaint .card-type {
    background-color: rgba(68, 205, 196, 0.1);
    color: var(--accent-secondary);
}

.card.gossip .card-type {
    background-color: rgba(255, 230, 109, 0.1);
    color: var(--accent-tertiary);
}

/* 卡片内容 */
.card-content {
    margin-bottom: 20px;
}

.card-text {
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
    margin: 0;
    word-wrap: break-word;
}

/* 卡片底部 */
.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.card-author {
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 16px;
    background-color: rgba(255, 255, 255, 0.05);
}

.card.anonymous .card-author {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-tertiary);
}

.card:not(.anonymous) .card-author {
    background-color: rgba(255, 107, 107, 0.1);
    color: var(--accent-primary);
}

.card-date {
    font-style: italic;
}

/* 邮箱面板 */
.email-panel {
    position: fixed;
    bottom: 80px;
    right: 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-lg);
    max-width: 300px;
    transform: translateY(100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-speed) var(--transition-ease);
    z-index: 99;
}

.email-panel.visible {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.email-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.email-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.email-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent-primary);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    background-color: rgba(255, 107, 107, 0.1);
    transition: all var(--transition-speed) var(--transition-ease);
    text-align: center;
    user-select: all;
}

.email-link:hover {
    background-color: rgba(255, 107, 107, 0.2);
    transform: translateY(-1px);
}

.email-note {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin: 0;
    text-align: center;
    line-height: 1.4;
}

.email-note a {
    color: var(--accent-secondary);
    text-decoration: none;
    transition: color var(--transition-speed) var(--transition-ease);
}

.email-note a:hover {
    color: var(--accent-primary);
}

/* 悬浮按钮 */
.floating-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    background-color: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-speed) var(--transition-ease);
    z-index: 100;
    font-size: 1.2rem;
}

.floating-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), 0 0 0 10px rgba(255, 107, 107, 0.1);
}

.floating-btn:active {
    transform: scale(0.95);
}

.btn-icon {
    transition: transform var(--transition-speed) var(--transition-ease);
}

.floating-btn:hover .btn-icon {
    transform: rotate(15deg);
}

/* Toast提示 */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background-color: var(--bg-card);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.95rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-speed) var(--transition-ease);
    z-index: 1000;
    max-width: 300px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    background-color: rgba(255, 107, 107, 0.1);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* 页脚 */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 32px 0;
    margin-top: 64px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-content p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

.footer-link {
    color: var(--accent-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-speed) var(--transition-ease);
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
}

.footer-link:hover {
    background-color: rgba(68, 205, 196, 0.1);
    color: var(--accent-primary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .logo-container {
        flex-direction: column;
        gap: 12px;
    }
    
    .site-title {
        font-size: 2rem;
    }
    
    .site-subtitle {
        font-size: 1rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .card {
        padding: 20px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .email-panel {
        right: 16px;
        left: 16px;
        max-width: none;
        bottom: 72px;
    }
    
    .floating-btn {
        right: 16px;
        bottom: 16px;
        width: 52px;
        height: 52px;
        font-size: 1.1rem;
    }
    
    .theme-toggle {
        top: 16px;
        right: 16px;
    }
    
    .header {
        padding: 32px 0;
    }
    
    .main-content {
        padding: 24px 16px;
    }
}

/* 隐藏类 */
.hidden {
    display: none !important;
}

/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn var(--transition-speed) var(--transition-ease);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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