/* RS232 Tool 帮助文档 - 主样式表 */

:root {
    --bg-page: #f5f7fb;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    --bg-code: #f6f8fb;
    --bg-hover: #eef3fb;
    --bg-active: #e3edfb;
    --color-text: #1f2535;
    --color-text-muted: #6b7385;
    --color-heading: #0f1f4f;
    --color-accent: #2b6bd6;
    --color-accent-dark: #1e54b3;
    --color-accent-soft: #d9e6fb;
    --color-border: #e3e8f1;
    --color-border-light: #eef1f7;
    --color-link: #2b6bd6;
    --color-warning: #e0772b;
    --shadow-card: 0 1px 2px rgba(31, 37, 53, 0.04), 0 4px 12px rgba(31, 37, 53, 0.05);
    --shadow-hover: 0 4px 20px rgba(43, 107, 214, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --sidebar-width: 280px;
    --header-height: 60px;
    --toc-width: 220px;
    --content-max-width: 880px;
    --content-padding: 36px 56px;
    --font-base: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font-base);
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--bg-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    min-height: 100vh;
}

/* ===== 顶部导航栏 ===== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: linear-gradient(135deg, #1f4ea8 0%, #2b6bd6 100%);
    color: #fff;
    box-shadow: 0 2px 10px rgba(31, 79, 168, 0.15);
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 0 24px;
}

.app-header .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 17px;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    letter-spacing: 0.3px;
}

.app-header .brand img {
    width: 30px;
    height: 30px;
    filter: brightness(0) invert(1) drop-shadow(0 0 4px rgba(255, 255, 255, 0.3));
}

.app-header .brand small {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.75);
    margin-left: 6px;
    font-weight: 400;
}

.app-header .header-tools {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 14px;
}

.app-header .search-box {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-md);
    padding: 6px 12px 6px 34px;
    color: #fff;
    width: 240px;
    font-size: 13px;
    transition: all 0.2s;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' fill='%23ffffff' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.1zM12 6.5a5.5 5.5 0 1 1-11 0 5.5 5.5 0 0 1 11 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 12px center;
}

.app-header .search-box::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.app-header .search-box:focus {
    outline: none;
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--color-text);
    border-color: transparent;
}

.app-header .header-link {
    color: rgba(255, 255, 255, 0.88);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: background 0.15s;
}

.app-header .header-link:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

/* ===== 左侧导航 ===== */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    padding: 24px 0 60px;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: #d6dde9;
    border-radius: 3px;
}

.sidebar .sidebar-section {
    margin-bottom: 18px;
}

.sidebar .sidebar-title {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 24px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.sidebar .sidebar-title .icon {
    width: 14px;
    height: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
}

.sidebar ul.nav-list {
    list-style: none;
    margin: 0;
    padding: 0 14px;
}

.sidebar ul.nav-list li {
    margin-bottom: 2px;
}

.sidebar ul.nav-list a {
    display: block;
    padding: 9px 14px;
    font-size: 13.5px;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all 0.15s;
    line-height: 1.4;
    border-left: 3px solid transparent;
}

.sidebar ul.nav-list a:hover {
    background: var(--bg-hover);
    color: var(--color-accent);
}

.sidebar ul.nav-list a.active {
    background: var(--bg-active);
    color: var(--color-accent);
    font-weight: 500;
    border-left-color: var(--color-accent);
}

.sidebar .nav-tag {
    display: inline-block;
    padding: 1px 6px;
    font-size: 10px;
    border-radius: 10px;
    margin-left: 6px;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    vertical-align: middle;
}

.sidebar .nav-tag.tag-new {
    background: #fde6cc;
    color: #c66712;
}

/* ===== 主内容 ===== */
.main {
    padding-top: var(--header-height);
    padding-left: var(--sidebar-width);
}

.layout {
    display: flex;
    gap: 32px;
    max-width: 1320px;
    margin: 0 auto;
    padding: 32px 32px 80px;
}

.content {
    flex: 1 1 auto;
    min-width: 0;
    max-width: var(--content-max-width);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--content-padding);
}

/* 适配小屏 */
@media (max-width: 1200px) {
    .toc-sidebar {
        display: none;
    }
}

@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.2s;
        z-index: 50;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main {
        padding-left: 0;
    }
    .content {
        padding: 24px;
    }
    .layout {
        padding: 16px;
    }
}

/* ===== 内容区排版 ===== */
.breadcrumb {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.breadcrumb a {
    color: var(--color-text-muted);
    text-decoration: none;
}

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

.breadcrumb .separator {
    margin: 0 6px;
    color: #c0c8d6;
}

.page-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-heading);
    margin: 0 0 16px;
    letter-spacing: -0.5px;
}

.page-lead {
    font-size: 16px;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin: 0 0 28px;
}

.section-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-heading);
    margin: 36px 0 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.section-title .section-num {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-heading);
    margin: 28px 0 10px;
}

h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin: 18px 0 8px;
}

p {
    margin: 0 0 14px;
}

a {
    color: var(--color-link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

strong {
    color: var(--color-heading);
    font-weight: 600;
}

ul, ol {
    padding-left: 22px;
    margin: 0 0 14px;
}

li {
    margin-bottom: 6px;
}

ul.steps {
    list-style: none;
    counter-reset: step;
    padding-left: 0;
}

ul.steps > li {
    counter-increment: step;
    position: relative;
    padding: 8px 12px 8px 44px;
    background: var(--bg-page);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

ul.steps > li::before {
    content: counter(step);
    position: absolute;
    left: 10px;
    top: 8px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* 图片 */
.content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    margin: 14px 0;
    display: block;
    background: #fafbfd;
}

.content figure {
    margin: 18px 0;
    text-align: center;
}

.content figcaption {
    font-size: 12.5px;
    color: var(--color-text-muted);
    margin-top: 8px;
}

/* 信息卡片 */
.callout {
    border-radius: var(--radius-md);
    padding: 14px 18px;
    margin: 18px 0;
    border-left: 4px solid var(--color-accent);
    background: var(--bg-hover);
    font-size: 14px;
}

.callout.info {
    border-color: var(--color-accent);
    background: #eaf2fe;
}

.callout.warn {
    border-color: var(--color-warning);
    background: #fdf2e6;
    color: #824a16;
}

.callout .callout-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-heading);
}

.callout .callout-body p:last-child {
    margin-bottom: 0;
}

/* 表格 */
.content table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.content table th {
    background: var(--bg-page);
    color: var(--color-heading);
    font-weight: 600;
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--color-border);
}

.content table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--color-border-light);
}

.content table tr:last-child td {
    border-bottom: none;
}

.content table tr:nth-child(even) td {
    background: #fafbfd;
}

/* ASCII 码表 */
.ascii-table {
    border-collapse: collapse;
    margin: 16px auto;
    font-size: 13px;
    width: auto;
}

.ascii-table th {
    background: #cff5ff;
    color: #1a1a1a;
    text-align: center;
    padding: 6px 10px;
    border: 1px solid #c0d4df;
    font-weight: 600;
}

.ascii-table td {
    border: 1px solid #c0d4df;
    padding: 4px 10px;
    text-align: center;
    background: #f6f6f6;
}

.ascii-table tr:nth-child(even) td {
    background: #fff;
}

.ascii-table td.control {
    font-family: var(--font-mono);
    color: #444;
}

/* 引用/提示 */
.key-term {
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg-code);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-family: var(--font-mono);
    color: var(--color-accent-dark);
}

.feature-list {
    list-style: none;
    padding-left: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 18px;
    margin: 14px 0;
}

@media (max-width: 700px) {
    .feature-list {
        grid-template-columns: 1fr;
    }
}

.feature-list li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 4px;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 7px;
    width: 14px;
    height: 14px;
    background-image: url("../images/dot.jpg");
    background-size: contain;
    background-repeat: no-repeat;
}

/* 上下页按钮 */
.page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border-light);
    gap: 12px;
    flex-wrap: wrap;
}

.page-nav a {
    display: flex;
    flex-direction: column;
    padding: 12px 18px;
    background: var(--bg-page);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.15s;
    border: 1px solid transparent;
    min-width: 180px;
    flex: 0 1 auto;
}

.page-nav a:hover {
    background: var(--bg-card);
    border-color: var(--color-accent-soft);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.page-nav .nav-label {
    font-size: 12px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 4px;
}

.page-nav .nav-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-accent);
}

.page-nav .nav-spacer {
    flex: 1;
}

.page-nav .nav-placeholder {
    visibility: hidden;
}

/* 浮动 TOC 侧边栏 */
.toc-sidebar {
    flex-shrink: 0;
    width: var(--toc-width);
    position: sticky;
    top: calc(var(--header-height) + 32px);
    align-self: flex-start;
    max-height: calc(100vh - var(--header-height) - 64px);
    overflow-y: auto;
    font-size: 13px;
}

.toc-sidebar .toc-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin: 0 0 14px;
    padding-left: 12px;
    border-left: 3px solid var(--color-accent);
}

.toc-sidebar ul {
    list-style: none;
    padding-left: 14px;
    margin: 0;
    border-left: 1px solid var(--color-border);
}

.toc-sidebar li {
    margin: 6px 0;
}

.toc-sidebar a {
    color: var(--color-text-muted);
    text-decoration: none;
    line-height: 1.5;
    display: block;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all 0.15s;
}

.toc-sidebar a:hover {
    color: var(--color-accent);
    background: var(--bg-hover);
    text-decoration: none;
}

/* ===== 首页 / 欢迎页 ===== */
.hero {
    padding: 56px 56px 32px;
    background: linear-gradient(135deg, #ffffff 0%, #f0f6ff 100%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    margin-bottom: 28px;
}

.hero h1 {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 14px;
    color: var(--color-heading);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.hero h1 img {
    width: 48px;
    height: 48px;
}

.hero .lead {
    font-size: 17px;
    color: var(--color-text-muted);
    margin: 0 0 24px;
    max-width: 760px;
    line-height: 1.7;
}

.hero .quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.hero .quick-actions a {
    display: flex;
    flex-direction: column;
    padding: 18px 20px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    text-decoration: none;
    transition: all 0.18s;
}

.hero .quick-actions a:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent-soft);
    box-shadow: var(--shadow-hover);
    text-decoration: none;
}

.hero .quick-actions a .quick-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 6px;
}

.hero .quick-actions a .quick-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.hero .quick-actions a .quick-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin: 18px 0;
}

.quick-card {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    transition: all 0.15s;
}

.quick-card:hover {
    border-color: var(--color-accent-soft);
    box-shadow: var(--shadow-hover);
}

.quick-card a {
    display: flex;
    flex-direction: column;
    color: inherit;
    text-decoration: none;
}

.quick-card .quick-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.quick-card .quick-card-title .icon {
    width: 26px;
    height: 26px;
    border-radius: 7px;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.quick-card .quick-card-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* 信息条目 */
.meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 14px;
    margin: 18px 0;
}

.meta-card {
    background: var(--bg-page);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    border: 1px solid var(--color-border-light);
}

.meta-card .meta-label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.meta-card .meta-value {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-heading);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    position: fixed;
    bottom: 22px;
    right: 22px;
    z-index: 60;
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 54px;
    height: 54px;
    box-shadow: 0 6px 18px rgba(43, 107, 214, 0.4);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

@media (max-width: 900px) {
    .mobile-menu-btn {
        display: flex;
    }
}

/* 代码 */
code, pre {
    font-family: var(--font-mono);
}

pre {
    background: var(--bg-code);
    padding: 14px 18px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-size: 13px;
    border: 1px solid var(--color-border-light);
    line-height: 1.55;
}

/* 隐藏章节的锚点偏移补偿 */
.content h2[id], .content h3[id] {
    scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 简化的侧边栏折叠（仅展示需要） */
.subsection-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 6px 14px 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

::selection {
    background: var(--color-accent-soft);
    color: var(--color-heading);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.content {
    animation: fadeIn 0.25s ease-out;
}

/* 不可点击的伪样式 */
.muted {
    color: var(--color-text-muted);
}

.divider {
    height: 1px;
    background: var(--color-border-light);
    margin: 24px 0;
}

/* ===== 首页「软件简介」专用样式（参考截图排版） ===== */
.intro-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.intro-header img {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.intro-header .intro-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-heading);
    letter-spacing: -0.2px;
}

.intro-divider {
    height: 2px;
    background: linear-gradient(90deg, #a040a0 0%, #c050b0 50%, #a040a0 100%);
    border: none;
    margin: 6px 0 20px;
    border-radius: 1px;
}

.intro-desc {
    margin: 0 0 16px;
    line-height: 1.8;
}

.intro-version {
    margin: 16px 0 4px;
    font-weight: 600;
}

.intro-features-title {
    margin: 20px 0 10px;
    font-weight: 700;
    font-size: 15.5px;
}

.intro-features {
    list-style: none;
    padding: 0;
    margin: 0 0 20px;
}

.intro-features li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 5px;
    line-height: 1.65;
}

.intro-features li::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 8px;
    width: 8px;
    height: 8px;
    background: #d04040;
    border-radius: 50%;
}