/**
 * Zero-Knowledge Private Library - UI/UX Core
 * Design Language: 微信读书风格
 */

/* =========================================
   1. CSS 变量系统 (支持一键暗黑模式)
   ========================================= */
:root {
    /* 白天模式 (微信读书风格) */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-elevated: #ffffff;
    --text-main: #1a1a1a;
    --text-muted: #999999;
    --border-color: #e5e5e5;
    --border-hover: #d9d9d9;
    --accent-color: #07c160; /* 微信绿 */
    --accent-soft: rgba(7, 193, 96, 0.1);
    --card-bg: #ffffff;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.06);
    --card-shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, "Liberation Mono", Menlo, monospace;
}

body.dark-theme {
    /* 黑夜模式 (微信读书暗黑风格) */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-elevated: #2a2a2a;
    --text-main: #e0e0e0;
    --text-muted: #888888;
    --border-color: #3a3a3a;
    --border-hover: #4a4a4a;
    --accent-color: #07c160;
    --accent-soft: rgba(7, 193, 96, 0.2);
    --card-bg: #2a2a2a;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.3);
    --card-shadow-hover: 0 4px 16px rgba(0,0,0,0.4);
}

/* =========================================
   2. 全局重置与排版基准
   ========================================= */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

.hidden { display: none; }

/* 优雅的自定义滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* =========================================
   3. SPA 视图切换逻辑 (核心动画)
   ========================================= */
.view-container {
    display: none;
    opacity: 0;
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.view-container.active {
    display: block !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================
   4. 视图 A: 保险库大门 (Auth)
   ========================================= */
#view-auth {
    height: 100vh;
    display: none;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-secondary);
}

#view-auth.active {
    display: flex !important;
}

.auth-box {
    background: var(--bg-elevated);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--card-shadow-hover);
    text-align: center;
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--border-color);
}

.auth-box h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.auth-box p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.auth-box input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    font-family: var(--font-mono);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    margin-bottom: 16px;
}

.auth-box input[type="password"]:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(35, 131, 226, 0.2);
}

.auth-box button {
    width: 100%;
    padding: 14px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s, background-color 0.2s;
}

.auth-box button:hover { 
    opacity: 0.9; 
    background-color: #06a84e;
}
.auth-box button:active { transform: scale(0.98); }

.error-msg {
    color: #e03e3e;
    font-size: 13px;
    margin-top: 12px;
    height: 18px; /* 占位防止跳动 */
}

/* =========================================
   5. 视图 B: 书房控制台 (Dashboard)
   ========================================= */
#view-dashboard header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 5%;
    background: rgba(var(--bg-primary), 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.logo { font-weight: 600; font-size: 18px; letter-spacing: -0.5px; }

header .actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

header .actions button {
    padding: 8px 16px;
    font-size: 14px;
    border-radius: 6px;
    cursor: pointer;
    margin-left: 0;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary { background: var(--text-main); color: var(--bg-primary); border: none; }
.btn-primary:hover { opacity: 0.9; }
.btn-secondary { background: transparent; color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--bg-secondary); }
.btn-ghost { background: var(--accent-soft); color: var(--accent-color); border: 1px solid transparent; }
.btn-ghost:hover { background: rgba(35, 131, 226, 0.18); }
.btn-danger { background: #e03e3e; color: white; border: none; }
.btn-danger:hover { background: #c92a2a; }

#view-dashboard main { padding: 40px 5%; max-width: 1200px; margin: 0 auto; }

.library-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding: 16px 20px;
    border-radius: 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.library-summary {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.summary-title {
    font-size: 16px;
    font-weight: 600;
}

.summary-meta {
    font-size: 12px;
    color: var(--text-muted);
}

.library-hint {
    font-size: 12px;
    color: var(--text-muted);
}

.library-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-input {
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    min-width: 200px;
}

.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(35, 131, 226, 0.2);
}

.sort-select {
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-main);
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s;
}

.sort-select:focus {
    border-color: var(--accent-color);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 0;
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.breadcrumb-item {
    cursor: pointer;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
}

.breadcrumb-item:hover {
    color: var(--accent-color);
}

.breadcrumb-item::after {
    content: '›';
    color: var(--border-color);
    margin-left: 8px;
}

.breadcrumb-item:last-child::after {
    content: '';
}

.breadcrumb-item:last-child {
    color: var(--text-main);
    cursor: default;
}

.recent-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: var(--card-shadow);
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 16px;
}

.recent-books {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
}

.recent-book-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.recent-book-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--accent-color);
}

.recent-book-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.recent-book-info {
    flex: 1;
    min-width: 0;
}

.recent-book-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.recent-book-meta {
    font-size: 12px;
    color: var(--text-muted);
}

.upload-status {
    font-size: 13px;
    margin-bottom: 16px;
    color: var(--text-muted);
    min-height: 18px;
}

.upload-status.success {
    color: #10a760;
}

.upload-status.error {
    color: #e03e3e;
}

.empty-state {
    border: 1px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px 24px;
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 24px;
    background: var(--bg-elevated);
}

.empty-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}

.empty-desc {
    font-size: 13px;
}

/* 瀑布流网格布局 */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

/* 微信读书风格卡片 */
.book-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 16px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--accent-color);
}

.book-card .book-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.book-card .book-title {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    line-height: 1.4;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-main);
}

.book-card .book-meta {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: auto;
    display: flex;
    justify-content: center;
    gap: 8px;
}

.folder-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 16px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.folder-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--accent-color);
}

.folder-card .folder-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.folder-card .folder-name {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    line-height: 1.4;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-main);
}

.folder-card .folder-meta {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: auto;
}

/* =========================================
   6. 视图 C: 沉浸式阅读器 (Reader)
   ========================================= */
#view-reader {
    background: var(--bg-primary);
    min-height: 100vh;
}

.reader-toolbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.reader-toolbar button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s;
    padding: 6px 12px;
    border-radius: 4px;
}

.reader-toolbar button:hover { 
    color: var(--text-main); 
    background: var(--bg-secondary);
}

.reader-toolbar button.active {
    background: var(--accent-soft);
    color: var(--accent-color);
}

#reader-title { font-size: 14px; font-weight: 500; color: var(--text-muted); }

/* 渲染容器：限制最大宽度，居中对齐，极佳的阅读行宽 */
#render-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 24px;
    min-height: calc(100vh - 50px);
}

/* txt 阅读器特定的排版优化 */
.txt-reader {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-main);
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: "Georgia", "Times New Roman", serif;
}

/* 阅读模式样式 */
body.reading-mode #view-reader {
    background: #f7f7f7;
}

body.reading-mode.dark-theme #view-reader {
    background: #1a1a1a;
}

body.reading-mode #render-container {
    max-width: 800px;
    padding: 40px 24px;
    background: white;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    margin: 20px auto;
    min-height: calc(100vh - 120px);
    border-radius: 8px;
}

body.reading-mode.dark-theme #render-container {
    background: #2a2a2a;
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

body.reading-mode .txt-reader {
    font-size: 18px;
    line-height: 1.9;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #1a1a1a;
    text-align: justify;
}

body.reading-mode.dark-theme .txt-reader {
    color: #e0e0e0;
}

body.reading-mode .reader-toolbar {
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

body.reading-mode.dark-theme .reader-toolbar {
    background: #2a2a2a;
    border-bottom-color: #3a3a3a;
}

/* PDF Canvas 响应式处理 */
#render-container canvas {
    max-width: 100%;
    height: auto;
    margin-bottom: 20px;
    box-shadow: var(--card-shadow);
    background: white; /* 修复某些透明 PDF 在暗黑模式下的问题 */
}

/* docx-preview 容器处理 */
.docx-wrapper {
    background: transparent !important;
    padding: 0 !important;
}
.docx-wrapper section.docx {
    box-shadow: none !important;
    margin-bottom: 0 !important;
    background: var(--bg-primary) !important;
    color: var(--text-main) !important;
}

/* 上传进度条 */
.progress-bar {
    background: var(--accent-color);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 24px;
    text-align: center;
    animation: pulse 1.5s infinite;
}
.progress-bar.hidden { display: none; }
@keyframes pulse {
    0% { opacity: 0.8; }
    50% { opacity: 1; }
    100% { opacity: 0.8; }
}

.context-menu {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--card-shadow-hover);
    min-width: 150px;
    padding: 4px 0;
}

.context-menu-item {
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-main);
    transition: background-color 0.2s;
}

.context-menu-item:hover {
    background-color: var(--bg-secondary);
}