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

:root {
    --bg-color: #f5f5f5;
    --text-color: #333;
    --header-bg: #fff;
    --card-bg: #fff;
    --border-color: #e0e0e0;
    --accent-color: #4a90d9;
}

[data-theme="light"] {
    --bg-color: #f5f5f5;
    --text-color: #333;
    --header-bg: #fff;
    --card-bg: #fff;
    --border-color: #e0e0e0;
}

[data-theme="sepia"] {
    --bg-color: #c7edcc;
    --text-color: #2d4a32;
    --header-bg: #b8e0be;
    --card-bg: #d4f0d8;
    --border-color: #a8d4ae;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #c0c0c0;
    --header-bg: #252525;
    --card-bg: #2a2a2a;
    --border-color: #3a3a3a;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.3s, color 0.3s;
}

.page {
    display: none;
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

.page.active {
    display: flex;
    flex-direction: column;
}

/* 书架页面 */
#bookshelf {
    background-color: var(--bg-color);
}

.header {
    background-color: var(--header-bg);
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header h1 {
    font-size: 20px;
    font-weight: 600;
}

.app-version {
    font-size: 12px;
    color: #999;
    font-weight: normal;
}

.book-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    -webkit-overflow-scrolling: touch;
}

.section-header {
    font-size: 13px;
    font-weight: 600;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 0 6px 4px;
    margin-top: 8px;
}

.section-header:first-child {
    margin-top: 0;
}

.recent-books {
    margin-bottom: 8px;
}

.last-read-info {
    font-size: 12px;
    color: var(--accent-color);
    margin-top: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    gap: 12px;
}

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

.book-cover {
    flex-shrink: 0;
    width: 70px;
    height: 100px;
    background-color: var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.book-info h3 {
    font-size: 17px;
    margin-bottom: 6px;
    color: var(--text-color);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-info p {
    font-size: 14px;
    color: #888;
}

.book-info .meta {
    margin-top: 8px;
    font-size: 12px;
    color: #aaa;
}

/* 阅读页面 */
#reader {
    background-color: var(--bg-color);
    position: relative;
}

.reader-header {
    background-color: var(--header-bg);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transform: translateY(-100%);
    transition: transform 0.3s;
}

.reader-header.visible {
    transform: translateY(0);
}

.back-btn, .menu-btn {
    background: none;
    border: none;
    font-size: 20px;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--text-color);
}

.book-title {
    font-size: 16px;
    font-weight: 500;
    flex: 1;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 0 10px;
}

.reader-content {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 20px;
    padding-top: 20px;
    padding-bottom: 60px;
    line-height: 1.9;
    font-size: 18px;
}

.chapter-title {
    font-size: 22px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 24px;
    padding-top: 10px;
}

.chapter-content {
    text-align: justify;
    word-break: break-word;
}

.chapter-content p {
    text-indent: 2em;
    margin-bottom: 1em;
}

.reader-footer {
    background-color: var(--header-bg);
    padding: 10px 16px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transform: translateY(100%);
    transition: transform 0.3s;
}

.reader-footer.visible {
    transform: translateY(0);
}

.progress-text {
    font-size: 13px;
    color: #888;
}

/* 翻页触摸区域 */
.tap-zone {
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: 50;
    /* 调试用，可删除 */
    /* background: rgba(255,0,0,0.1); */
}

.tap-zone-left {
    left: 0;
    width: 25%;
}

.tap-zone-center {
    left: 25%;
    width: 50%;
}

.tap-zone-right {
    right: 0;
    width: 25%;
}

/* 设置面板 */
.settings-panel {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 200;
    display: none;
    justify-content: center;
    align-items: flex-end;
}

.settings-panel.visible {
    display: flex;
}

.settings-content {
    background-color: var(--card-bg);
    width: 100%;
    max-height: 70vh;
    border-radius: 20px 20px 0 0;
    padding: 20px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.settings-section {
    margin-bottom: 20px;
}

.settings-section h3 {
    font-size: 15px;
    color: #888;
    margin-bottom: 12px;
}

.chapter-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.chapter-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 15px;
    transition: background-color 0.2s;
}

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

.chapter-item:active {
    background-color: var(--border-color);
}

.chapter-item.current {
    color: var(--accent-color);
    font-weight: 500;
}

.jump-control {
    display: flex;
    gap: 10px;
}

.jump-control input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.jump-control button {
    padding: 10px 20px;
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    cursor: pointer;
}

.font-size-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.font-btn {
    width: 50px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
}

.font-btn:active {
    background-color: var(--border-color);
}

.font-size-display {
    font-size: 18px;
    font-weight: 500;
    min-width: 30px;
    text-align: center;
}

.theme-options {
    display: flex;
    gap: 10px;
}

.theme-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 15px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.theme-btn:active, .theme-btn.active {
    border-color: var(--accent-color);
}

.theme-btn[data-theme="light"] {
    background-color: #f5f5f5;
    color: #333;
}

.theme-btn[data-theme="sepia"] {
    background-color: #c7edcc;
    color: #2d4a32;
}

.theme-btn[data-theme="dark"] {
    background-color: #1a1a1a;
    color: #c0c0c0;
}

.close-settings {
    width: 100%;
    padding: 14px;
    background-color: var(--border-color);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-color);
    margin-top: 10px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #888;
}

.empty-state p {
    font-size: 16px;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: #888;
}

/* 安全区域适配 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .reader-footer {
        padding-bottom: calc(10px + env(safe-area-inset-bottom));
    }
    
    .settings-content {
        padding-bottom: calc(20px + env(safe-area-inset-bottom));
    }
}