/* ==========================================================================
   邻语 LinYu 官网公共样式（base.css）
   设计方向：「暖橙 · 奶油邻里」柔软现代风
   主色：#FF8C42（暖橙）
   辅色：#C9703A（深橙）
   强调：#6BBF59（柔和绿）
   背景：#FFF9F2（奶油白）
   分隔：#F4D9B8（米黄）
   圆角：20-24dp 柔软
   阴影：柔和弥散
   ========================================================================== */

/* ---------- 字体 ---------- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@500;600;700;900&family=Noto+Sans+SC:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica,
        Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.25s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    display: block;
}

ul,
ol {
    list-style: none;
}

::selection {
    background-color: rgba(255, 140, 66, 0.20);
    color: var(--color-text);
}

/* ---------- CSS 变量（设计系统） ---------- */
:root {
    /* 主色 - 暖橙 */
    --color-primary: #FF8C42;
    --color-primary-dark: #C9703A;
    --color-primary-light: #FFB07A;
    --color-primary-soft: #FFF1E6;
    --color-primary-tint: #FFD9B8;

    /* 强调色 - 柔和绿 */
    --color-accent: #6BBF59;
    --color-accent-dark: #4F9E3F;
    --color-accent-soft: #E8F5E3;

    /* 文字 */
    --color-text: #3D2B1F;
    --color-text-light: #5A3F2E;
    --color-text-muted: #8B7355;

    /* 背景与边框 */
    --color-bg: #FFF9F2;
    --color-bg-card: #FFFFFF;
    --color-bg-soft: #FBEFE2;
    --color-bg-alt: #F7E4C8;
    --color-border: #F4D9B8;
    --color-border-light: #FBEFE2;

    /* 状态色 */
    --color-success: #6BBF59;
    --color-danger: #E74C3C;

    /* 阴影（柔和弥散） */
    --shadow-xs: 0 2px 6px rgba(201, 112, 58, 0.04);
    --shadow-sm: 0 4px 14px rgba(201, 112, 58, 0.08);
    --shadow-md: 0 10px 30px rgba(201, 112, 58, 0.12);
    --shadow-lg: 0 20px 50px rgba(201, 112, 58, 0.16);
    --shadow-glow: 0 0 0 4px rgba(255, 140, 66, 0.10);

    /* 圆角（20-24dp 柔软） */
    --radius-xs: 6px;
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-full: 999px;

    /* 排版 */
    --font-serif: "Noto Serif SC", "Songti SC", "STSong", serif;
    --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", Menlo, monospace;

    --max-width: 1080px;
    --max-width-narrow: 820px;
    --nav-height: 68px;
}

/* ---------- 顶部导航栏（glassmorphism） ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: rgba(255, 249, 242, 0.82);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid rgba(244, 217, 184, 0.6);
    z-index: 1000;
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(255, 249, 242, 0.95);
    box-shadow: var(--shadow-sm);
}

.navbar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-serif);
    font-size: 19px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.5px;
}

.navbar-brand:hover {
    color: var(--color-primary-dark);
}

.brand-logo {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -1px;
    box-shadow: 0 4px 12px rgba(255, 140, 66, 0.30);
    position: relative;
    overflow: hidden;
}

.brand-logo::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.40) 0%, transparent 60%);
    pointer-events: none;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.navbar-nav a {
    display: block;
    padding: 9px 16px;
    color: var(--color-text-light);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.25s ease;
    position: relative;
}

.navbar-nav a:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-soft);
}

.navbar-nav a.active {
    color: var(--color-primary);
    background-color: var(--color-primary-soft);
    font-weight: 600;
}

/* 移动端菜单按钮 */
.navbar-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: none;
    background: transparent;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    border-radius: var(--radius-sm);
}

.navbar-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.navbar-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.navbar-toggle.open span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 通用布局 ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.main {
    padding-top: var(--nav-height);
}

/* ---------- 通用按钮（可被各页面复用） ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
    line-height: 1.2;
    font-family: var(--font-sans);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    box-shadow: 0 6px 18px rgba(255, 140, 66, 0.30);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 10px 26px rgba(255, 140, 66, 0.38);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1.5px solid var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-accent {
    background-color: var(--color-accent);
    color: #fff;
    box-shadow: 0 6px 18px rgba(107, 191, 89, 0.32);
}

.btn-accent:hover {
    background-color: var(--color-accent-dark);
    color: #fff;
    transform: translateY(-2px);
}

.btn-lg {
    padding: 15px 38px;
    font-size: 16px;
}

/* ---------- 页脚 ---------- */
.footer {
    background-color: #3D2B1F;
    color: #C4B5A0;
    padding: 56px 0 28px;
    font-size: 14px;
    position: relative;
}

.footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-primary) 50%, transparent 100%);
    opacity: 0.5;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 36px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    color: #fff;
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 700;
}

.footer-desc {
    color: #8B7355;
    line-height: 1.75;
    max-width: 380px;
}

.footer-col h4 {
    color: #fff;
    font-family: var(--font-serif);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.footer-col ul li {
    margin-bottom: 11px;
}

.footer-col a {
    color: #8B7355;
    transition: color 0.2s ease;
}

.footer-col a:hover {
    color: var(--color-primary-light);
}

.footer-bottom {
    border-top: 1px solid #5A3F2E;
    padding-top: 22px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    color: #8B7355;
    font-size: 13px;
}

.footer-bottom .company-info {
    color: #8B7355;
    font-family: var(--font-mono);
    font-size: 12px;
}
.company-info img {
    vertical-align: middle;
    display: inline-block;
    margin: 0 3px;
    word-break: keep-all;
}
.company-info span {
    word-break: keep-all;
    display: inline;
}

/* ---------- 阅读进度条 ---------- */
.read-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    z-index: 1100;
    width: 0;
    transition: width 0.1s ease;
    box-shadow: 0 0 8px rgba(255, 140, 66, 0.4);
}

/* ---------- 回到顶部按钮 ---------- */
.back-to-top {
    position: fixed;
    right: 28px;
    bottom: 28px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: 0 8px 22px rgba(255, 140, 66, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 900;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* ---------- 滚动渐入动画 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.in {
    opacity: 1;
    transform: translateY(0);
}

.reveal.delay-1 { transition-delay: 0.08s; }
.reveal.delay-2 { transition-delay: 0.16s; }
.reveal.delay-3 { transition-delay: 0.24s; }
.reveal.delay-4 { transition-delay: 0.32s; }
.reveal.delay-5 { transition-delay: 0.4s; }

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    html {
        scroll-behavior: auto;
    }
}

/* ---------- 法律文档页（隐私 / EULA） ---------- */
.legal-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 56px;
    padding: 56px 0 72px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

/* 侧边目录 */
.legal-toc-side {
    position: sticky;
    top: calc(var(--nav-height) + 32px);
    align-self: start;
    max-height: calc(100vh - var(--nav-height) - 64px);
    overflow-y: auto;
    padding: 22px 20px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xs);
}

.legal-toc-side::-webkit-scrollbar {
    width: 5px;
}

.legal-toc-side::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 3px;
}

.legal-toc-side h3 {
    font-family: var(--font-mono);
    margin-top: 0;
    margin-bottom: 14px;
    font-size: 11px;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 600;
}

.legal-toc-side ol {
    margin-bottom: 0;
    padding-left: 0;
    counter-reset: toc;
}

.legal-toc-side ol li {
    list-style: none;
    margin-bottom: 2px;
    font-size: 13.5px;
    counter-increment: toc;
    line-height: 1.45;
}

.legal-toc-side ol li a {
    display: block;
    text-decoration: none;
    color: var(--color-text-light);
    padding: 7px 10px 7px 30px;
    border-radius: var(--radius-xs);
    transition: all 0.2s ease;
    position: relative;
    border-left: 2px solid transparent;
}

.legal-toc-side ol li a::before {
    content: counter(toc, decimal-leading-zero);
    position: absolute;
    left: 8px;
    top: 7px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.legal-toc-side ol li a:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-soft);
}

.legal-toc-side ol li a.active {
    color: var(--color-primary);
    background-color: var(--color-primary-soft);
    border-left-color: var(--color-primary);
    font-weight: 600;
}

.legal-toc-side ol li a.active::before {
    color: var(--color-primary);
}

/* 法律页主内容 */
.legal-page {
    min-width: 0;
}

.legal-header {
    text-align: center;
    margin-bottom: 44px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.legal-header::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: 2px;
}

.legal-header .eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 14px;
    padding: 4px 12px;
    background-color: var(--color-accent-soft);
    border-radius: var(--radius-full);
}

.legal-header h1 {
    font-family: var(--font-serif);
    font-size: 38px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.legal-header .updated {
    color: var(--color-text-muted);
    font-size: 14px;
    font-family: var(--font-mono);
}

.legal-content {
    font-size: 15.5px;
    color: var(--color-text);
    line-height: 1.9;
}

.legal-content > h2 {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin-top: 44px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    position: relative;
    scroll-margin-top: calc(var(--nav-height) + 24px);
}

.legal-content > h2::before {
    content: "";
    display: inline-block;
    width: 4px;
    height: 22px;
    background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: 2px;
    vertical-align: -4px;
    margin-right: 12px;
}

.legal-content > h2:first-child {
    margin-top: 0;
}

.legal-content h3 {
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 26px;
    margin-bottom: 12px;
}

.legal-content p {
    margin-bottom: 14px;
    color: var(--color-text-light);
}

.legal-content ul,
.legal-content ol {
    margin: 0 0 16px 0;
    padding-left: 24px;
    color: var(--color-text-light);
}

.legal-content ul li,
.legal-content ol li {
    list-style: disc;
    margin-bottom: 9px;
    line-height: 1.75;
}

.legal-content ol li {
    list-style: decimal;
}

.legal-content ul ul,
.legal-content ol ul {
    margin-top: 8px;
    margin-bottom: 4px;
}

.legal-content ul ul li {
    list-style: circle;
}

.legal-content strong {
    color: var(--color-text);
    font-weight: 600;
}

.legal-content .highlight {
    background-color: var(--color-primary-soft);
    border-left: 4px solid var(--color-primary);
    padding: 18px 22px;
    margin: 22px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text);
    position: relative;
    box-shadow: var(--shadow-xs);
}

.legal-content .highlight::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.legal-content .highlight p {
    margin-bottom: 8px;
    color: var(--color-text);
}

.legal-content .highlight p:last-child {
    margin-bottom: 0;
}

.legal-content .highlight strong {
    color: var(--color-primary-dark);
}

.legal-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: rgba(255, 140, 66, 0.3);
    text-underline-offset: 3px;
    transition: text-decoration-color 0.2s ease;
}

.legal-content a:hover {
    text-decoration-color: var(--color-primary);
}

.legal-content .contact-box {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 22px 26px;
    margin-top: 18px;
    box-shadow: var(--shadow-xs);
    position: relative;
}

.legal-content .contact-box::before {
    content: "联系方式";
    position: absolute;
    top: -10px;
    left: 22px;
    background-color: var(--color-bg-card);
    padding: 0 10px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-accent);
    letter-spacing: 1.5px;
    font-weight: 600;
}

.legal-content .contact-box p {
    margin-bottom: 7px;
}

.legal-content .contact-box p:last-child {
    margin-bottom: 0;
}

/* 移动端隐藏侧边目录，显示内嵌目录 */
.legal-toc-inline {
    display: none;
    background-color: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    margin-bottom: 32px;
}

.legal-toc-inline h3 {
    margin-top: 0;
    margin-bottom: 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 600;
}

.legal-toc-inline ol {
    margin-bottom: 0;
    padding-left: 22px;
}

.legal-toc-inline ol li {
    list-style: decimal;
    margin-bottom: 6px;
    font-size: 14px;
}

.legal-toc-inline a {
    text-decoration: none;
}

.legal-toc-inline a:hover {
    text-decoration: underline;
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
    .legal-layout {
        grid-template-columns: 1fr;
        gap: 0;
        padding-left: 0;
        padding-right: 0;
    }

    .legal-toc-side {
        display: none;
    }

    .legal-toc-inline {
        display: block;
    }

    .legal-page {
        padding: 0 24px;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 15px;
    }

    .navbar-toggle {
        display: flex;
    }

    .navbar-nav {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background-color: var(--color-bg-card);
        border-bottom: 1px solid var(--color-border);
        padding: 10px 16px;
        gap: 2px;
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease, padding 0.35s ease;
        padding-top: 0;
        padding-bottom: 0;
    }

    .navbar-nav.open {
        max-height: 360px;
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .navbar-nav a {
        padding: 13px 14px;
        font-size: 15px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .legal-header h1 {
        font-size: 28px;
    }

    .legal-content > h2 {
        font-size: 20px;
    }

    .legal-content {
        font-size: 14.5px;
    }
}

@media (max-width: 480px) {
    .navbar-inner {
        padding: 0 18px;
    }

    .container {
        padding: 0 18px;
    }

    .legal-page {
        padding: 0 18px;
    }

    .back-to-top {
        right: 18px;
        bottom: 18px;
        width: 42px;
        height: 42px;
    }
}