/* ========================================
   中国风诗歌集样式表
   Poetry Collection - Chinese Style
   ======================================== */

/* --- CSS 变量定义 --- */
:root {
    /* 配色方案 */
    --bg-paper: #f5f0e6;          /* 宣纸米白 */
    --bg-paper-alt: #ebe4d8;      /* 宣纸米白（深） */
    --text-ink: #333333;          /* 深墨色 */
    --text-ink-light: #555555;    /* 浅墨色 */
    --text-ink-lighter: #777777;  /* 更浅墨色 */
    --accent-red: #c93737;        /* 朱砂红 */
    --accent-red-dark: #a82929;   /* 朱砂红（深） */
    --accent-green: #7a9f97;      /* 淡竹青 */
    --accent-gold: #b8915e;       /* 古铜金 */
    --border-ink: #d4c8b8;        /* 边框墨色 */

    /* 字体 */
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "思源宋体",
                  "Songti SC", "宋体-简", "宋体", "SimSun", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* 尺寸 */
    --max-width: 800px;
    --border-radius: 4px;
}

/* --- 全局样式 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-serif);
    background-color: var(--bg-paper);
    color: var(--text-ink);
    line-height: 1.8;
    min-height: 100vh;
    /* 宣纸纹理效果 */
    background-image:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.01) 2px,
            rgba(0, 0, 0, 0.01) 4px
        );
}

/* --- 容器 --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* --- 封面区域 --- */
.cover {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.main-title {
    font-size: 3rem;
    font-weight: 400;
    letter-spacing: 0.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-ink);
    text-shadow: 2px 2px 0 rgba(201, 55, 55, 0.1);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--accent-green);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.2rem;
}

.author {
    font-size: 0.95rem;
    color: var(--text-ink-lighter);
    font-style: italic;
}

.motto {
    font-size: 0.9rem;
    color: var(--accent-gold);
    margin-top: var(--spacing-sm);
    font-family: "Georgia", "Times New Roman", serif;
    font-style: italic;
    letter-spacing: 0.05rem;
}

.motto-cn {
    font-size: 0.85rem;
    color: var(--text-ink-lighter);
    margin-top: var(--spacing-xs);
    font-style: normal;
}

.decorative-line {
    width: 120px;
    height: 2px;
    margin: var(--spacing-md) auto;
    position: relative;
}

.decorative-line.top {
    background: linear-gradient(90deg,
        transparent,
        var(--accent-red),
        transparent);
}

.decorative-line.bottom {
    background: linear-gradient(90deg,
        transparent,
        var(--accent-green),
        transparent);
}

/* --- 目录区域 --- */
.table-of-contents {
    background-color: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--border-ink);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.toc-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-red);
    font-weight: 500;
    letter-spacing: 0.3rem;
}

.toc-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.toc-category {
    border-left: 2px solid var(--accent-red);
    padding-left: var(--spacing-sm);
}

.toc-category h3 {
    font-size: 1.1rem;
    color: var(--accent-red);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.poem-list {
    list-style: none;
    padding-left: var(--spacing-xs);
}

.poem-list li {
    margin-bottom: 0.4rem;
}

.poem-list a {
    color: var(--text-ink-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease, padding-left 0.3s ease;
    display: inline-block;
}

.poem-list a:hover {
    color: var(--accent-red);
    padding-left: 0.3rem;
}

/* --- 诗歌内容区域 --- */
.poems {
    margin-bottom: var(--spacing-xxl);
}

/* 分类分隔线 */
.category-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-md) 0;
}

.category-divider::before,
.category-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg,
        transparent,
        var(--border-ink),
        transparent);
}

.category-divider span {
    padding: 0 var(--spacing-md);
    color: var(--accent-red);
    font-size: 1.2rem;
    letter-spacing: 0.2rem;
    white-space: nowrap;
}

/* 诗歌卡片 */
.poem {
    background-color: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--border-ink);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.poem:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.poem-title {
    font-size: 1.4rem;
    color: var(--accent-red);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    letter-spacing: 0.1rem;
}

.poem-author {
    color: var(--text-ink-lighter);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.poem-content {
    text-align: center;
    white-space: pre-line;
}

.poem-content p {
    margin-bottom: 0.5rem;
    color: var(--text-ink);
}

/* --- 页脚说明 --- */
.notes {
    background-color: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--border-ink);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.notes-title {
    text-align: center;
    font-size: 1.2rem;
    color: var(--accent-red);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.2rem;
}

.notes ol {
    padding-left: var(--spacing-lg);
    color: var(--text-ink-light);
    font-size: 0.9rem;
}

.notes li {
    margin-bottom: 0.5rem;
}

.compile-time,
.author-info {
    text-align: center;
    color: var(--text-ink-lighter);
    font-size: 0.85rem;
    margin-top: var(--spacing-md);
    font-style: italic;
}

/* --- 返回顶部按钮 --- */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background-color: var(--accent-red);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(201, 55, 55, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--accent-red-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(201, 55, 55, 0.4);
}

/* --- 响应式设计 --- */
@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.4rem;
        --spacing-sm: 0.8rem;
        --spacing-md: 1.2rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-xxl: 2.5rem;
    }

    .main-title {
        font-size: 2rem;
        letter-spacing: 0.3rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .motto {
        font-size: 0.85rem;
    }

    .motto-cn {
        font-size: 0.8rem;
    }

    .toc-content {
        grid-template-columns: 1fr;
    }

    .poem-title {
        font-size: 1.2rem;
    }

    .poem-content p {
        font-size: 0.95rem;
    }

    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .container {
        padding: var(--spacing-sm);
    }

    .main-title {
        font-size: 1.8rem;
    }

    .table-of-contents {
        padding: var(--spacing-md);
    }

    .poem {
        padding: var(--spacing-md);
    }

    .category-divider span {
        font-size: 1rem;
        padding: 0 var(--spacing-xs);
    }
}

/* --- 打印样式 --- */
@media print {
    body {
        background: white;
        background-image: none;
    }

    .container {
        max-width: 100%;
    }

    .table-of-contents {
        break-inside: avoid;
    }

    .poem {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .back-to-top {
        display: none;
    }

    .cover {
        page-break-after: avoid;
    }

    .notes {
        page-break-before: avoid;
    }
}

/* --- 滚动条样式 --- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-paper-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-green);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-red);
}

/* --- 选中文本样式 --- */
::selection {
    background-color: rgba(201, 55, 55, 0.2);
    color: var(--text-ink);
}

::-moz-selection {
    background-color: rgba(201, 55, 55, 0.2);
    color: var(--text-ink);
}

/* ========================================
   新增交互功能样式
   ======================================== */

/* --- 深色主题变量 --- */
[data-theme="dark"] {
    --bg-paper: #1a1a1a;
    --bg-paper-alt: #252525;
    --text-ink: #e8e8e8;
    --text-ink-light: #c8c8c8;
    --text-ink-lighter: #a0a0a0;
    --border-ink: #3a3a3a;
}

/* 系统偏好自动适配 */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-paper: #1a1a1a;
        --bg-paper-alt: #252525;
        --text-ink: #e8e8e8;
        --text-ink-light: #c8c8c8;
        --text-ink-lighter: #a0a0a0;
        --border-ink: #3a3a3a;
    }
}

/* --- 阅读进度条 --- */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-red), var(--accent-green));
    width: 0%;
    transition: width 0.1s ease;
    z-index: 1001;
}

/* --- 主题切换按钮 --- */
.theme-toggle {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--border-ink);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    background: white;
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
    color: var(--text-ink);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-toggle {
        background: rgba(26, 26, 26, 0.9);
    }
}

/* --- 云纹装饰 --- */
.cloud-decoration {
    position: fixed;
    width: 150px;
    height: 150px;
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}

.cloud-decoration::before,
.cloud-decoration::after {
    content: '';
    position: absolute;
    background: var(--accent-red);
    border-radius: 50%;
}

.cloud-top-left { top: 50px; left: 50px; }
.cloud-top-right { top: 50px; right: 50px; }
.cloud-bottom-left { bottom: 50px; left: 50px; }
.cloud-bottom-right { bottom: 50px; right: 50px; }

.cloud-decoration::before {
    width: 80px;
    height: 80px;
    top: 35px;
    left: 35px;
}

.cloud-decoration::after {
    width: 60px;
    height: 60px;
    top: 20px;
    left: 45px;
}

/* --- 搜索框样式 --- */
.search-container {
    position: relative;
    max-width: 400px;
    margin: var(--spacing-md) auto 0;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 3rem;
    border: 2px solid var(--border-ink);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.8);
    font-family: var(--font-serif);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-red);
    box-shadow: 0 0 0 3px rgba(201, 55, 55, 0.1);
}

.search-icon {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-ink-lighter);
    pointer-events: none;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: var(--spacing-xs);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    max-height: 300px;
    overflow-y: auto;
    z-index: 100;
    display: none;
}

.search-results.show {
    display: block;
}

.search-result-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border-ink);
}

.search-result-item:hover {
    background: var(--bg-paper);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-highlight {
    color: var(--accent-red);
    font-weight: bold;
}

.no-results {
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-ink-lighter);
}

/* --- 随机推荐按钮 --- */
.random-btn {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent-red);
    color: white;
    border: none;
    border-radius: 20px;
    font-family: var(--font-serif);
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.3s ease;
}

.random-btn:hover {
    background: var(--accent-red-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(201, 55, 55, 0.3);
}

.random-btn svg {
    flex-shrink: 0;
}

/* --- 诗歌卡片头部 --- */
.poem-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.poem-header .poem-title {
    margin-bottom: 0;
}

/* --- 诗歌操作按钮 --- */
.poem-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.copy-btn,
.share-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-ink);
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-ink-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    padding: 0;
}

.copy-btn:hover,
.share-btn:hover {
    background: var(--accent-red);
    color: white;
    border-color: var(--accent-red);
}

.copy-btn svg,
.share-btn svg {
    width: 16px;
    height: 16px;
}

/* --- Toast 提示 --- */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text-ink);
    color: var(--bg-paper);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 20px;
    font-size: 0.9rem;
    opacity: 0;
    animation: toast-in-out 2s ease forwards;
    z-index: 2000;
}

@keyframes toast-in-out {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    15% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    85% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
}

/* --- 滚动淡入动画 --- */
.poem {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.3s ease;
}

.poem.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 覆盖原有的 hover 效果 */
.poem.visible:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

/* --- 搜索高亮动画 --- */
@keyframes highlight-pulse {
    0%, 100% { box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08); }
    50% { box-shadow: 0 4px 24px rgba(201, 55, 55, 0.3); transform: scale(1.02); }
}

.search-highlight {
    animation: highlight-pulse 0.5s ease;
}