/**
 * 半糖书屋 - 阅读页面样式
 * 沉浸式阅读体验设计
 */

/* ========================================
   CSS 变量 - 主题系统
   ======================================== */
:root {
    /* 默认主题 */
    --read-bg: #fffdf9;
    --read-text: #3a3a3a;
    --read-text-secondary: #666;
    --read-header-bg: rgba(255, 253, 249, 0.95);
    --read-border: rgba(210, 180, 140, 0.2);
    --read-shadow: 0 2px 8px rgba(139, 90, 43, 0.1);
    --read-accent: var(--primary-color);
    --read-panel-bg: #fff;
}

.theme-sepia {
    --read-bg: #f5e6c8;
    --read-text: #4a4033;
    --read-text-secondary: #6b5d4d;
    --read-header-bg: rgba(245, 230, 200, 0.95);
    --read-border: rgba(139, 90, 43, 0.2);
    --read-panel-bg: #f0dfc0;
}

.theme-green {
    --read-bg: #c7edcc;
    --read-text: #2d4a32;
    --read-text-secondary: #456b4a;
    --read-header-bg: rgba(199, 237, 204, 0.95);
    --read-border: rgba(45, 74, 50, 0.2);
    --read-panel-bg: #b8e0be;
}

.theme-dark {
    --read-bg: #1a1a1a;
    --read-text: #c0c0c0;
    --read-text-secondary: #888;
    --read-header-bg: rgba(26, 26, 26, 0.95);
    --read-border: rgba(255, 255, 255, 0.1);
    --read-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --read-accent: #d4a574;
    --read-panel-bg: #252525;
}

/* ========================================
   基础样式
   ======================================== */
.read-body {
    margin: 0;
    padding: 0;
    background: var(--read-bg);
    color: var(--read-text);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ========================================
   顶部导航栏
   ======================================== */
.read-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--read-header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--read-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 1000;
    transform: translateY(0);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.read-header.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--read-text);
    transition: background-color 0.3s ease;
}

.back-btn:hover {
    background: var(--read-border);
    color: var(--read-accent);
}

.book-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.book-info .book-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--read-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.book-info .chapter-info {
    font-size: 12px;
    color: var(--read-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: 50%;
    color: var(--read-text);
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header-btn:hover {
    background: var(--read-border);
    color: var(--read-accent);
}

/* ========================================
   阅读进度条
   ======================================== */
.read-progress {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--read-border);
    z-index: 999;
    transition: top 0.3s ease;
}

/* 当导航栏隐藏时，进度条贴合顶部 */
.read-header.hidden ~ .read-progress {
    top: 0;
}

.progress-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-warm));
    transition: width 0.1s ease;
}

/* ========================================
   主阅读区域
   ======================================== */
.read-main {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 24px 120px;
}

.read-content {
    background: transparent;
}

/* 章节标题 */
.chapter-header {
    text-align: center;
    margin-bottom: 48px;
    padding-bottom: 24px;
    border-bottom: 1px dashed var(--read-border);
}

.chapter-header .chapter-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--read-text);
    margin-bottom: 16px;
    line-height: 1.4;
}

.chapter-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 14px;
    color: var(--read-text-secondary);
}

.chapter-meta .vip-tag {
    color: var(--primary-color);
}

/* 章节内容 */
.chapter-content {
    font-size: 18px;
    line-height: 2;
    text-align: justify;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.chapter-content.font-serif {
    font-family: "Songti SC", "SimSun", serif;
}

.chapter-content.font-kai {
    font-family: "Kaiti SC", "KaiTi", serif;
}

.chapter-content p {
    margin-bottom: 1.5em;
    text-indent: 2em;
}

.chapter-content p:first-child {
    text-indent: 0;
}

.chapter-content p:first-child::first-letter {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--read-accent);
    float: left;
    line-height: 1;
    margin-right: 8px;
    margin-top: 4px;
}

/* 章节底部 */
.chapter-footer {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px dashed var(--read-border);
}

.chapter-end-mark {
    text-align: center;
    color: var(--read-text-secondary);
    font-size: 14px;
}

/* ========================================
   章节导航
   ======================================== */
.chapter-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 48px;
    padding: 24px 0;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--read-text);
    background: var(--read-panel-bg);
    border: 1px solid var(--read-border);
    transition: all 0.3s ease;
    text-decoration: none;
}

.nav-btn:hover:not(.disabled) {
    background: var(--read-accent);
    color: #fff;
    border-color: var(--read-accent);
}

.nav-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-btn.catalog-btn {
    background: var(--read-accent);
    color: #fff;
    border-color: var(--read-accent);
}

.nav-btn.catalog-btn:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

/* ========================================
   侧边目录面板
   ======================================== */
.catalog-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 320px;
    height: 100vh;
    background: var(--read-panel-bg);
    box-shadow: var(--read-shadow);
    z-index: 1100;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    flex-direction: column;
}

.catalog-panel.open {
    transform: translateX(0);
}

.catalog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--read-border);
}

.catalog-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--read-text);
}

.close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    border-radius: 50%;
    color: var(--read-text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: var(--read-border);
    color: var(--read-accent);
}

.catalog-info {
    display: flex;
    gap: 16px;
    padding: 20px;
    border-bottom: 1px solid var(--read-border);
}

.catalog-cover {
    width: 60px;
    height: 80px;
    object-fit: cover;
    border-radius: 4px;
}

.catalog-book-info h4 {
    margin: 0 0 8px;
    font-size: 15px;
    font-weight: 600;
    color: var(--read-text);
}

.catalog-book-info p {
    margin: 0 0 8px;
    font-size: 13px;
    color: var(--read-text-secondary);
}

.catalog-book-info .chapter-count {
    font-size: 12px;
    color: var(--read-accent);
}

.catalog-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.catalog-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    color: var(--read-text);
    transition: all 0.3s ease;
    text-decoration: none;
}

.catalog-item:hover {
    background: var(--read-border);
}

.catalog-item.active {
    background: rgba(196, 139, 74, 0.1);
    color: var(--read-accent);
}

.catalog-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--read-accent);
}

.catalog-number {
    flex-shrink: 0;
    font-size: 13px;
    color: var(--read-text-secondary);
}

.catalog-title {
    flex: 1;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.catalog-vip-badge {
    flex-shrink: 0;
    padding: 2px 6px;
    font-size: 10px;
    background: linear-gradient(135deg, #ffd700, #ffb347);
    color: #fff;
    border-radius: 4px;
}

/* ========================================
   设置面板
   ======================================== */
.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 320px;
    height: 100vh;
    background: var(--read-panel-bg);
    box-shadow: var(--read-shadow);
    z-index: 1100;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    flex-direction: column;
}

.settings-panel.open {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--read-border);
}

.settings-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--read-text);
}

.settings-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.setting-item {
    margin-bottom: 24px;
}

.setting-item label {
    display: block;
    margin-bottom: 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--read-text);
}

/* 字体大小控制 */
.font-size-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.size-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--read-border);
    background: var(--read-bg);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    color: var(--read-text);
    cursor: pointer;
    transition: all 0.3s ease;
}

.size-btn:hover {
    background: var(--read-accent);
    color: #fff;
    border-color: var(--read-accent);
}

.size-value {
    font-size: 18px;
    font-weight: 600;
    color: var(--read-accent);
    min-width: 40px;
    text-align: center;
}

/* 行间距控制 */
.line-height-control {
    display: flex;
    gap: 8px;
}

.lh-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--read-border);
    background: var(--read-bg);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--read-text);
    cursor: pointer;
    transition: all 0.3s ease;
}

.lh-btn:hover,
.lh-btn.active {
    background: var(--read-accent);
    color: #fff;
    border-color: var(--read-accent);
}

/* 主题控制 */
.theme-control {
    display: flex;
    gap: 12px;
}

.theme-btn {
    width: 48px;
    height: 48px;
    border: 2px solid transparent;
    background: transparent;
    border-radius: 50%;
    padding: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.theme-preview {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 50%;
}

.theme-preview.default {
    background: linear-gradient(135deg, #fffdf9, #fff8ee);
    border: 1px solid #e0d5c5;
}

.theme-preview.sepia {
    background: linear-gradient(135deg, #f5e6c8, #e8d4a8);
    border: 1px solid #c9b896;
}

.theme-preview.green {
    background: linear-gradient(135deg, #c7edcc, #b0d9b5);
    border: 1px solid #8cc494;
}

.theme-preview.dark {
    background: linear-gradient(135deg, #1a1a1a, #2d2d2d);
    border: 1px solid #444;
}

/* 字体选择 */
.font-family-control {
    display: flex;
    gap: 8px;
}

.ff-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--read-border);
    background: var(--read-bg);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--read-text);
    cursor: pointer;
    transition: all 0.3s ease;
}

.ff-btn:hover,
.ff-btn.active {
    background: var(--read-accent);
    color: #fff;
    border-color: var(--read-accent);
}

/* ========================================
   遮罩层
   ======================================== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.overlay.show {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   底部快捷操作栏
   ======================================== */
.read-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--read-header-bg);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--read-border);
    padding: 12px 24px;
    z-index: 1000;
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.read-footer.hidden {
    transform: translateY(100%);
}

.footer-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 600px;
    margin: 0 auto;
}

.footer-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--read-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-btn:hover:not(.disabled) {
    color: var(--read-accent);
}

.footer-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.progress-info {
    font-size: 14px;
    color: var(--read-accent);
    font-weight: 600;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .read-main {
        padding: 72px 16px 100px;
    }

    .chapter-header .chapter-title {
        font-size: 20px;
    }

    .chapter-content {
        font-size: 16px;
    }

    .chapter-nav {
        flex-wrap: wrap;
    }

    .nav-btn {
        padding: 10px 16px;
        font-size: 13px;
    }

    .catalog-panel,
    .settings-panel {
        width: 280px;
    }

    .footer-btn {
        padding: 8px 12px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .book-info .book-title {
        max-width: 150px;
    }

    .chapter-nav {
        gap: 8px;
    }

    .nav-btn {
        padding: 8px 12px;
        font-size: 12px;
    }

    .catalog-panel,
    .settings-panel {
        width: 100%;
    }
}

/* ========================================
   自动加载开关
   ======================================== */
.auto-load-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--read-border);
    transition: 0.3s;
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: #fff;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-warm));
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

.toggle-label {
    font-size: 13px;
    color: var(--read-text-secondary);
}

/* ========================================
   VIP 购买弹窗
   ======================================== */
.vip-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.vip-modal.show {
    opacity: 1;
    visibility: visible;
}

.vip-modal-content {
    position: relative;
    width: 90%;
    max-width: 360px;
    background: var(--read-panel-bg);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.vip-modal.show .vip-modal-content {
    transform: scale(1) translateY(0);
}

.vip-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    border-radius: 50%;
    color: var(--read-text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.vip-modal-close:hover {
    background: var(--read-border);
    color: var(--read-text);
}

.vip-modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, #ffd700, #ffb347);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.3);
}

.vip-modal-title {
    margin: 0 0 8px;
    font-size: 20px;
    font-weight: 600;
    color: var(--read-text);
}

.vip-modal-desc {
    margin: 0 0 20px;
    font-size: 14px;
    color: var(--read-text-secondary);
}

.vip-modal-info {
    background: var(--read-bg);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-bottom: 20px;
}

.vip-chapter-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--read-text);
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--read-border);
}

.vip-price,
.vip-balance {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    margin-bottom: 8px;
}

.vip-price:last-child,
.vip-balance:last-child {
    margin-bottom: 0;
}

.price-label,
.balance-label {
    color: var(--read-text-secondary);
}

.price-value {
    font-weight: 600;
    color: var(--primary-color);
}

.balance-value {
    color: var(--read-text);
}

.vip-modal-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.vip-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.vip-btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-warm));
    color: #fff;
}

.vip-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(196, 139, 74, 0.3);
}

.vip-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.vip-btn-secondary {
    background: linear-gradient(135deg, #ffd700, #ffb347);
    color: #5a4a3a;
}

.vip-btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 215, 0, 0.3);
}

.vip-modal-tip {
    margin: 0;
    font-size: 12px;
    color: var(--read-text-secondary);
}

/* ========================================
   章节加载提示
   ======================================== */
.chapter-loading {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--read-panel-bg);
    padding: 12px 24px;
    border-radius: 24px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--read-text);
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

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

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--read-border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   追加章节分隔线
   ======================================== */
.appended-chapter {
    margin-top: 48px;
    animation: fadeIn 0.5s ease;
}

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

.chapter-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
    padding: 24px 0;
}

.divider-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--read-border), transparent);
}

.divider-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--read-text-secondary);
    padding: 8px 16px;
    background: var(--read-bg);
    border: 1px dashed var(--read-border);
    border-radius: 20px;
}

/* ========================================
   Toast 提示
   ======================================== */
.read-toast {
    position: fixed;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 12px 24px;
    border-radius: 24px;
    font-size: 14px;
    z-index: 3000;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

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