/* 基础变量 */
:root {
    --bg: #f5f0e8;
    --bg-secondary: #ede6d8;
    --text: #2c2c2c;
    --text-secondary: #666;
    --accent: #8b4513;
    --border: #d4c5a9;
    --card-bg: #fffef9;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.08);
    --reader-bg: #f8f4eb;
    --header-bg: rgba(245, 240, 232, 0.95);
    --font-size: 18px;
    --line-height: 1.8;
    --font-family: 'Noto Serif SC', 'Source Han Serif', Georgia, serif;
}

[data-theme="dark"] {
    --bg: #1a1a2e;
    --bg-secondary: #16213e;
    --text: #e0d6c8;
    --text-secondary: #9a8e82;
    --accent: #c4956a;
    --border: #2a2a4a;
    --card-bg: #1e1e3a;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.3);
    --reader-bg: #1a1a2e;
    --header-bg: rgba(26, 26, 46, 0.95);
}

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

body {
    font-family: var(--font-family);
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

/* 头部 */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    max-width: 800px;
    margin: 0 auto;
}

.header-inner h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background 0.2s;
}

.icon-btn:active {
    background: var(--bg-secondary);
}

.hidden { display: none !important; }

/* 搜索 */
.search-bar {
    padding: 16px;
    max-width: 800px;
    margin: 0 auto;
}

.search-bar input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--card-bg);
    color: var(--text);
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
}

.search-bar input:focus {
    border-color: var(--accent);
}

/* 书架网格 */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
    padding: 0 16px 32px;
    max-width: 800px;
    margin: 0 auto;
}

.book-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 16px 12px;
    text-align: center;
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border);
}

.book-card:active {
    transform: scale(0.98);
}

.book-cover {
    width: 100%;
    aspect-ratio: 3/4;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent), var(--bg-secondary));
    color: white;
}

.book-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    font-size: 12px;
    color: var(--text-secondary);
}

.book-meta {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 6px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state p { margin-bottom: 8px; }
.hint { font-size: 13px; opacity: 0.7; }

/* 主内容区 */
main {
    padding-top: 60px;
    min-height: 100vh;
}

/* 阅读器 */
#reader-content {
    max-width: 680px;
    margin: 0 auto;
    padding: 20px 20px 40px;
    font-size: var(--font-size);
    line-height: var(--line-height);
    font-family: var(--font-family);
}

#reader-content h1 { font-size: 1.6em; margin: 1.5em 0 0.8em; }
#reader-content h2 { font-size: 1.4em; margin: 1.3em 0 0.6em; }
#reader-content h3 { font-size: 1.2em; margin: 1.2em 0 0.5em; }
#reader-content p { margin-bottom: 1em; text-indent: 2em; }
#reader-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 16px;
    margin: 1em 0;
    color: var(--text-secondary);
}
#reader-content ul, #reader-content ol {
    padding-left: 2em;
    margin-bottom: 1em;
}
#reader-content code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}
#reader-content pre {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1em 0;
}
#reader-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 1em 0;
}

/* 阅读器控制 */
.reader-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background: var(--bg-secondary);
    font-size: 13px;
    color: var(--text-secondary);
}

.settings-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    padding: 4px 8px;
}

/* 设置面板 */
.settings-panel {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 16px;
    position: sticky;
    top: 56px;
    z-index: 50;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.setting-row span {
    font-size: 14px;
    color: var(--text-secondary);
}

.size-controls button, .setting-row select {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text);
    cursor: pointer;
    margin-left: 6px;
    font-size: 14px;
}

/* 章节导航 */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    padding: 20px;
    max-width: 680px;
    margin: 0 auto;
    border-top: 1px solid var(--border);
}

.nav-btn {
    padding: 10px 20px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.nav-btn:active:not(:disabled) {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* 详情页 */
#book-detail {
    padding: 24px;
    max-width: 800px;
    margin: 0 auto;
}

#book-detail h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

#book-detail .author {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

#book-detail .desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
}

#chapter-list {
    padding: 0 16px 32px;
    max-width: 800px;
    margin: 0 auto;
}

.chapter-item {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}

.chapter-item:active {
    background: var(--bg-secondary);
}

.chapter-item .num {
    color: var(--accent);
    font-weight: 600;
    margin-right: 12px;
    min-width: 28px;
}

.chapter-item .title {
    flex: 1;
    font-size: 15px;
}

/* 响应式 */
@media (max-width: 480px) {
    .book-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
        padding: 0 12px 24px;
    }
    #reader-content {
        padding: 16px;
        font-size: calc(var(--font-size) - 1px);
    }
}

/* 密码验证层 */
.auth-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.auth-box {
    background: var(--card-bg);
    padding: 40px 32px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    border: 1px solid var(--border);
    width: 300px;
    max-width: 90%;
}

.auth-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.auth-box h2 {
    font-size: 22px;
    margin-bottom: 8px;
    color: var(--text);
}

.auth-box p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.auth-box input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: var(--bg);
    color: var(--text);
    font-size: 18px;
    text-align: center;
    letter-spacing: 4px;
    outline: none;
    margin-bottom: 16px;
    transition: border-color 0.2s;
}

.auth-box input:focus {
    border-color: var(--accent);
}

.auth-btn {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.auth-btn:active {
    opacity: 0.8;
}

.auth-error {
    color: #e74c3c;
    font-size: 13px;
    margin-top: 12px;
}

/* 上架时间 */
.upload-date {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 4px;
    opacity: 0.7;
}

/* 标签 */
.book-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 6px;
    justify-content: center;
}

.book-tag {
    font-size: 10px;
    padding: 2px 6px;
    background: var(--bg-secondary);
    border-radius: 4px;
    color: var(--accent);
}

/* 阅读进度条 */
#progress-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--border);
    z-index: 100;
}

#progress-fill {
    height: 100%;
    background: var(--accent);
    transition: width 0.2s;
    width: 0%;
}