/* ============================================================
   styles.css - 华为数通笔记展示页面样式
   ============================================================ */

/* --- CSS 变量定义 --- */
:root {
    --color-primary: #cf0a2c;
    --color-primary-hover: #b00824;
    --color-primary-light: #fde8ec;
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-sidebar-bg: #1a1d23;
    --color-sidebar-text: #c8ccd4;
    --color-sidebar-hover: #2a2d35;
    --color-sidebar-active: #cf0a2c;
    --color-text: #2c3e50;
    --color-text-secondary: #5a6c7d;
    --color-border: #e2e6ea;
    --color-code-bg: #f4f5f7;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-overlay: rgba(0, 0, 0, 0.5);
    --color-back-top: #cf0a2c;
    --color-table-stripe: #fafbfc;
    --color-blockquote-border: #cf0a2c;
    --color-blockquote-bg: #fef5f7;
    --color-scrollbar-thumb: #c0c4cc;
    --color-scrollbar-track: transparent;
    --sidebar-width: 280px;
    --topbar-height: 56px;
    --transition-speed: 0.25s;
    --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Consolas', 'Monaco', monospace;
    --border-radius: 8px;
}

/* 暗色模式 */
[data-theme="dark"] {
    --color-primary: #e8455c;
    --color-primary-hover: #f06275;
    --color-primary-light: #3d1a22;
    --color-bg: #1a1d23;
    --color-surface: #22252d;
    --color-sidebar-bg: #16181e;
    --color-sidebar-text: #a8adb8;
    --color-sidebar-hover: #22252d;
    --color-sidebar-active: #e8455c;
    --color-text: #e0e3e8;
    --color-text-secondary: #9aa0ab;
    --color-border: #353840;
    --color-code-bg: #2a2d37;
    --color-shadow: rgba(0, 0, 0, 0.35);
    --color-overlay: rgba(0, 0, 0, 0.7);
    --color-table-stripe: #282b33;
    --color-blockquote-border: #e8455c;
    --color-blockquote-bg: #2a2228;
    --color-scrollbar-thumb: #4a4d55;
    --color-scrollbar-track: #1a1d23;
}

/* --- 全局重置 --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* --- 滚动条美化 --- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--color-scrollbar-track);
}
::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* --- 顶部栏 --- */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 16px;
    z-index: 1000;
    box-shadow: 0 1px 4px var(--color-shadow);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
    gap: 12px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--border-radius);
    color: var(--color-text);
    transition: background-color 0.2s;
}
.menu-toggle:hover {
    background-color: var(--color-code-bg);
}
.menu-icon {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    position: relative;
    border-radius: 1px;
}
.menu-icon::before,
.menu-icon::after {
    content: '';
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    position: absolute;
    border-radius: 1px;
    transition: transform 0.25s;
}
.menu-icon::before {
    top: -7px;
}
.menu-icon::after {
    top: 7px;
}
.menu-toggle.active .menu-icon {
    background: transparent;
}
.menu-toggle.active .menu-icon::before {
    transform: translateY(7px) rotate(45deg);
}
.menu-toggle.active .menu-icon::after {
    transform: translateY(-7px) rotate(-45deg);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-primary);
    flex-shrink: 0;
}
.logo-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    white-space: nowrap;
    letter-spacing: 0.5px;
    transition: color var(--transition-speed);
}
.logo-icon {
    flex-shrink: 0;
}

.top-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, color 0.2s;
}
.btn-icon:hover {
    background-color: var(--color-code-bg);
    color: var(--color-primary);
}

/* 暗色模式图标切换 */
[data-theme="dark"] .sun-icon {
    display: none;
}
[data-theme="light"] .moon-icon,
:root:not([data-theme="dark"]) .moon-icon {
    display: none;
}

/* --- 应用容器 --- */
.app-container {
    display: flex;
    padding-top: var(--topbar-height);
    min-height: 100vh;
}

/* --- 遮罩层 --- */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-overlay);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--transition-speed);
}
.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* --- 侧边栏 --- */
.sidebar {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--topbar-height));
    background-color: var(--color-sidebar-bg);
    color: var(--color-sidebar-text);
    display: flex;
    flex-direction: column;
    z-index: 999;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--transition-speed) ease, background-color var(--transition-speed);
    border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar-header {
    padding: 20px 20px 8px;
    flex-shrink: 0;
}
.sidebar-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #e8eaef;
    letter-spacing: 0.5px;
}

/* 搜索框 */
.search-box {
    padding: 10px 16px;
    flex-shrink: 0;
}
.search-box input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background-color: rgba(255, 255, 255, 0.06);
    color: #e8eaef;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s, background-color 0.2s;
    font-family: var(--font-sans);
}
.search-box input::placeholder {
    color: rgba(200, 204, 212, 0.5);
}
.search-box input:focus {
    border-color: var(--color-sidebar-active);
    background-color: rgba(255, 255, 255, 0.1);
}

/* 导航列表 */
.nav-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px 12px 16px;
}
.nav-category {
    margin-bottom: 4px;
}
.nav-category-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: rgba(200, 204, 212, 0.5);
    padding: 10px 10px 6px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
}
.nav-category-title:hover {
    color: rgba(200, 204, 212, 0.8);
}
.nav-category-title .arrow {
    font-size: 0.6rem;
    transition: transform 0.2s;
    display: inline-block;
}
.nav-category.collapsed .nav-category-title .arrow {
    transform: rotate(-90deg);
}
.nav-category.collapsed .nav-category-items {
    display: none;
}
.nav-category-items {
    list-style: none;
}
.nav-item {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--color-sidebar-text);
    padding: 9px 12px 9px 24px;
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.18s;
    font-family: var(--font-sans);
    line-height: 1.4;
    position: relative;
}
.nav-item:hover {
    background-color: var(--color-sidebar-hover);
    color: #fff;
}
.nav-item.active {
    background-color: rgba(207, 10, 44, 0.2);
    color: #fff;
    font-weight: 500;
}
.nav-item.active::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 18px;
    background-color: var(--color-sidebar-active);
    border-radius: 2px;
}
.nav-item.hidden {
    display: none;
}

/* 侧边栏底部 */
.sidebar-footer {
    padding: 14px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.72rem;
    color: rgba(200, 204, 212, 0.45);
    text-align: center;
    flex-shrink: 0;
}
.sidebar-footer .footer-sub {
    margin-top: 2px;
    letter-spacing: 1px;
}

/* --- 内容区 --- */
.content-area {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 32px 40px 60px;
    max-width: 1000px;
    width: 100%;
    position: relative;
    transition: margin-left var(--transition-speed) ease;
    min-height: calc(100vh - var(--topbar-height));
}

/* --- 欢迎页 --- */
.welcome-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--topbar-height) - 92px);
    text-align: center;
}
.welcome-content {
    max-width: 560px;
    padding: 40px 24px;
}
.welcome-icon {
    color: var(--color-primary);
    margin-bottom: 20px;
    opacity: 0.85;
}
.welcome-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
    letter-spacing: 1px;
}
.welcome-desc {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}
.welcome-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 28px;
}
.welcome-tags span {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 5px 13px;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.3px;
}
.welcome-hint {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    opacity: 0.7;
}
.welcome-mobile-hint {
    display: none;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    opacity: 0.7;
}

/* --- 笔记内容 --- */
.note-content {
    animation: fadeIn 0.35s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}
.note-meta {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}
.note-meta .note-category-tag {
    background-color: var(--color-primary);
    color: #fff;
    padding: 4px 12px;
    border-radius: 14px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}
.note-meta .note-date {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* Markdown 渲染样式 */
.markdown-body {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text);
}
.markdown-body h1 { font-size: 1.8rem; font-weight: 700; margin: 1.4em 0 0.6em; padding-bottom: 0.4em; border-bottom: 2px solid var(--color-border); }
.markdown-body h2 { font-size: 1.4rem; font-weight: 600; margin: 1.3em 0 0.5em; padding-bottom: 0.3em; border-bottom: 1px solid var(--color-border); }
.markdown-body h3 { font-size: 1.15rem; font-weight: 600; margin: 1.1em 0 0.4em; }
.markdown-body h4 { font-size: 1rem; font-weight: 600; margin: 1em 0 0.3em; }
.markdown-body p { margin: 0.7em 0; }
.markdown-body a { color: var(--color-primary); text-decoration: none; border-bottom: 1px dotted var(--color-primary); transition: border-color 0.2s; }
.markdown-body a:hover { border-bottom-style: solid; }
.markdown-body ul, .markdown-body ol { padding-left: 1.8em; margin: 0.6em 0; }
.markdown-body li { margin: 0.3em 0; }
.markdown-body blockquote { border-left: 4px solid var(--color-blockquote-border); background-color: var(--color-blockquote-bg); padding: 12px 18px; margin: 1em 0; border-radius: 0 6px 6px 0; font-style: italic; }
.markdown-body blockquote p { margin: 0.3em 0; }
.markdown-body code { background-color: var(--color-code-bg); padding: 2px 7px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.88em; color: #e8455c; border: 1px solid var(--color-border); }
[data-theme="dark"] .markdown-body code { color: #f08c98; }
.markdown-body pre { background-color: var(--color-code-bg); border: 1px solid var(--color-border); border-radius: var(--border-radius); padding: 16px 20px; overflow-x: auto; margin: 1em 0; font-size: 0.85rem; line-height: 1.6; }
.markdown-body pre code { background: none; padding: 0; border: none; color: inherit; font-size: inherit; }
.markdown-body table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 0.9rem; }
.markdown-body th, .markdown-body td { border: 1px solid var(--color-border); padding: 10px 14px; text-align: left; }
.markdown-body th { background-color: var(--color-code-bg); font-weight: 600; }
.markdown-body tr:nth-child(even) td { background-color: var(--color-table-stripe); }
.markdown-body img { max-width: 100%; height: auto; border-radius: 6px; margin: 0.8em 0; }
.markdown-body hr { border: none; border-top: 1px solid var(--color-border); margin: 2em 0; }
.markdown-body strong { color: var(--color-primary); }
[data-theme="dark"] .markdown-body strong { color: #f08c98; }

/* 代码块复制按钮 */
.code-block-wrapper { position: relative; }
.copy-btn { position: absolute; top: 8px; right: 12px; background: rgba(128,128,128,0.2); border: none; color: var(--color-text-secondary); padding: 4px 10px; border-radius: 4px; cursor: pointer; font-size: 0.72rem; opacity: 0; transition: opacity 0.2s, background 0.2s; font-family: var(--font-sans); }
.code-block-wrapper:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: rgba(128,128,128,0.4); }
.copy-btn.copied { background: #27ae60; color: #fff; }

/* --- 返回顶部按钮 --- */
.back-to-top { position: fixed; bottom: 30px; right: 30px; width: 42px; height: 42px; border-radius: 50%; background-color: var(--color-back-top); color: #fff; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 14px rgba(207,10,44,0.35); opacity: 0; transform: translateY(20px); pointer-events: none; transition: all 0.3s; z-index: 100; }
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background-color: var(--color-primary-hover); transform: translateY(-3px); box-shadow: 0 6px 20px rgba(207,10,44,0.45); }

/* --- 响应式设计 --- */
@media (max-width: 900px) {
    :root { --sidebar-width: 260px; }
    .content-area { padding: 24px 20px 48px; }
    .markdown-body { font-size: 0.9rem; }
    .markdown-body h1 { font-size: 1.5rem; }
    .markdown-body h2 { font-size: 1.25rem; }
}
@media (max-width: 768px) {
    .menu-toggle { display: flex; align-items: center; justify-content: center; }
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .content-area { margin-left: 0; padding: 20px 14px 40px; }
    .welcome-mobile-hint { display: block; }
    .welcome-hint { display: none; }
    .back-to-top { bottom: 20px; right: 16px; width: 38px; height: 38px; }
    .markdown-body pre { padding: 12px 14px; font-size: 0.78rem; }
    .markdown-body table { font-size: 0.78rem; }
    .markdown-body th, .markdown-body td { padding: 6px 8px; }
}
@media (min-width: 1400px) {
    .content-area { max-width: 1100px; padding: 36px 56px 64px; }
    .markdown-body { font-size: 1rem; }
}
@media print {
    .top-bar, .sidebar, .sidebar-overlay, .back-to-top, .copy-btn { display: none !important; }
    .content-area { margin-left: 0 !important; padding: 0 !important; max-width: 100% !important; }
    .markdown-body { font-size: 12pt; }
}