/* ================================================================
   MyLibrary — 个人学习记录
   设计方向：「墨与纸」— 学术感、档案感、温暖的私人图书馆
   基于 .clinerules frontend-design 规范优化
   v2 — 增加视觉层次、呼吸感、专业细节
   ================================================================ */

/* ===== CSS 变量 ===== */
:root {
    /* --- 墨色系（文字）--- */
    --ink: #1e1b18;
    --ink-light: #5c5750;
    --ink-muted: #8a847a;
    --ink-faint: #b5afa5;

    /* --- 纸色系（背景）--- */
    --paper: #faf8f5;
    --paper-warm: #f5f1e9;
    --surface: #ffffff;
    --surface-warm: #fdfbf7;

    /* --- 橄榄绿系（主强调）--- */
    --accent: #4a6741;
    --accent-subtle: rgba(74, 103, 65, 0.07);
    --accent-soft: rgba(74, 103, 65, 0.13);
    --accent-dark: #3a5234;

    /* --- 琥珀暖色（互动强调）--- */
    --amber: #b8753b;
    --amber-subtle: rgba(184, 117, 59, 0.07);
    --amber-soft: rgba(184, 117, 59, 0.14);

    /* --- 边框/分隔 --- */
    --border: #e8e3db;
    --border-light: #f0ebe2;
    --divider: #e5e0d8;

    /* --- 字体 --- */
    --font-serif: 'Noto Serif SC', 'Georgia', 'STSong', 'SimSun', serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;

    /* --- 间距 --- */
    --space-2xs: 0.25rem;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;

    /* --- 布局 --- */
    --container-max: 1280px;
    --container-narrow: 1000px;
    --container-padding: 1.75rem;

    /* --- 圆角 --- */
    --radius-xs: 3px;
    --radius-sm: 5px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* --- 过渡 --- */
    --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
    --ease-in-out: cubic-bezier(0.45, 0, 0.15, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 180ms;
    --duration-base: 300ms;
    --duration-slow: 450ms;
}

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

html {
    scroll-behavior: smooth;
    font-size: 20px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    color: var(--ink);
    background-color: var(--paper);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.35;
    color: var(--ink);
    letter-spacing: -0.01em;
}

a {
    color: var(--amber);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

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

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

:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: 2px;
    border-radius: var(--radius-xs);
}

/* ================================================================
   容器
   ================================================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

/* ================================================================
   导航栏
   ================================================================ */
.site-header {
    background-color: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
    transition: box-shadow var(--duration-base) var(--ease-out);
}

.site-header.scrolled {
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03), 0 2px 16px rgba(0, 0, 0, 0.04);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 66px;
}

.logo a {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.03em;
    transition: color var(--duration-fast) var(--ease-out);
}

.logo a:hover {
    color: var(--amber);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 0.15rem;
}

.nav-link {
    display: block;
    padding: 0.45rem 0.95rem;
    font-size: 0.88rem;
    font-weight: 450;
    color: var(--ink-light);
    border-radius: var(--radius-sm);
    position: relative;
    transition: color var(--duration-fast) var(--ease-out);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0.3rem;
    left: 0.95rem;
    right: 0.95rem;
    height: 1.5px;
    background-color: var(--accent);
    border-radius: 1px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--duration-base) var(--ease-out);
}

.nav-link:hover {
    color: var(--accent);
    background-color: transparent;
}

.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-item.active .nav-link {
    color: var(--accent);
    background-color: transparent;
    font-weight: 550;
}

.nav-item.active .nav-link::after {
    transform: scaleX(1);
    background-color: var(--amber);
}

/* ================================================================
   按钮
   ================================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1.8rem;
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--duration-base) var(--ease-out);
    text-decoration: none;
    text-align: center;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
    box-shadow: 0 1px 3px rgba(74, 103, 65, 0.15);
}

.btn-primary:hover {
    background-color: var(--accent-dark);
    color: #fff;
    box-shadow: 0 3px 14px rgba(74, 103, 65, 0.2);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--ink);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: var(--accent-subtle);
    transform: translateY(-1px);
}

.btn-small {
    padding: 0.45rem 1.15rem;
    font-size: 0.825rem;
}

.btn-download {
    background-color: var(--accent);
    color: #fff;
    box-shadow: 0 1px 3px rgba(74, 103, 65, 0.15);
}

.btn-download:hover {
    background-color: var(--accent-dark);
    color: #fff;
    box-shadow: 0 3px 14px rgba(74, 103, 65, 0.2);
    transform: translateY(-1px);
}

.btn-read {
    background-color: transparent;
    color: var(--amber);
    border: 1px solid var(--amber);
}

.btn-read:hover {
    background-color: var(--amber);
    color: #fff;
    box-shadow: 0 3px 12px rgba(184, 117, 59, 0.2);
    transform: translateY(-1px);
}

/* ================================================================
   主内容区
   ================================================================ */
.main-content {
    flex: 1;
    padding-top: 0;
}

/* ================================================================
   页面标题区（教程/工具/笔记页通用）
   ================================================================ */
.page-header {
    background: linear-gradient(180deg, #f5f2ec 0%, var(--paper) 100%);
    color: var(--ink);
    padding: var(--space-xl) 0;
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--border-light);
}

.page-header h1 {
    color: var(--ink);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--ink-light);
    font-size: 1.05rem;
    max-width: 600px;
}

/* ================================================================
   首页 Hero
   重设计：更大的视觉冲击力、精致的装饰元素、分层排版
   ================================================================ */
.hero-section {
    background: linear-gradient(180deg, #fcfaf7 0%, var(--paper) 100%);
    color: var(--ink);
    padding: var(--space-3xl) 0 calc(var(--space-3xl) + 1rem);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* 大尺寸背景装饰圆环 */
.hero-section::before {
    content: '';
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    border-radius: 50%;
    border: 1px solid var(--border-light);
    opacity: 0.5;
    pointer-events: none;
}

/* 内层圆环 */
.hero-section::after {
    content: '';
    position: absolute;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    width: 480px;
    height: 480px;
    border-radius: 50%;
    border: 1px solid var(--border);
    opacity: 0.3;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 680px;
    margin: 0 auto;
}

/* 小标签：在标题上方作为引言 */
.hero-eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-muted);
    margin-bottom: 1.25rem;
    padding: 0.25rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    background-color: rgba(255, 255, 255, 0.5);
}

.hero-title {
    font-size: 3.4rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 1.5rem;
    letter-spacing: 0.04em;
    line-height: 1.2;
    position: relative;
}

/* 标题下方装饰线 */
.hero-rule {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.85rem;
    margin-bottom: 1.75rem;
}

.hero-rule::before,
.hero-rule::after {
    content: '';
    height: 1px;
    width: 52px;
    background-color: var(--border);
}

.hero-rule-diamond {
    width: 6px;
    height: 6px;
    background-color: var(--amber);
    transform: rotate(45deg);
    opacity: 0.55;
}

.hero-subtitle {
    font-size: 1.08rem;
    line-height: 1.9;
    color: var(--ink-light);
    margin-bottom: 2.25rem;
    font-weight: 350;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 0.85rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-cta .btn {
    min-width: 140px;
}

.hero-cta .btn-secondary {
    background-color: transparent;
    color: var(--ink-light);
    border-color: var(--border);
}

.hero-cta .btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: var(--accent-subtle);
    transform: translateY(-1px);
}

/* ================================================================
   数据统计条 (新)
   ================================================================ */
.stats-ribbon {
    background-color: var(--surface);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-lg) 0;
}

.stats-list {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    list-style: none;
}

.stats-item {
    text-align: center;
}

.stats-number {
    display: block;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.stats-label {
    display: block;
    font-size: 0.78rem;
    color: var(--ink-muted);
    font-weight: 450;
    letter-spacing: 0.04em;
    margin-top: 0.2rem;
}

.stats-divider {
    width: 1px;
    background-color: var(--border);
    opacity: 0.6;
}

/* ================================================================
   区块标题
   ================================================================ */
.section-title {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    text-align: center;
    color: var(--ink);
    letter-spacing: 0.03em;
}

.section-title::after {
    content: '';
    display: block;
    margin: 0.65rem auto 0;
    width: 52px;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--border) 25%, var(--amber) 50%, var(--border) 75%, transparent 100%);
    border-radius: 1px;
}

.section-subtitle {
    text-align: center;
    color: var(--ink-muted);
    font-size: 0.92rem;
    margin-top: -0.9rem;
    margin-bottom: var(--space-lg);
    font-weight: 350;
}

/* ================================================================
   卡片系统（首页快速导航）
   ================================================================ */
.cards-section {
    padding: var(--space-2xl) 0;
    background-color: var(--paper);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}


.card {
    width: 100%;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-md) var(--space-md);
    position: relative;
    overflow: hidden;
    transition:
        border-color var(--duration-base) var(--ease-out),
        box-shadow var(--duration-base) var(--ease-out),
        transform var(--duration-base) var(--ease-out);
}

/* 左侧书签线 */
.card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    bottom: 14px;
    width: 3px;
    background-color: var(--accent);
    border-radius: 0 2px 2px 0;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--duration-base) var(--ease-out);
    opacity: 0;
}

.card:hover::before {
    transform: scaleY(1);
    opacity: 1;
}

.card-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-decoration: none;
    color: var(--ink);
    cursor: pointer;
}

.card-link:hover {
    border-color: var(--accent);
    box-shadow: 0 6px 24px rgba(74, 103, 65, 0.07);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--ink);
}

/* 图标容器：小圆底 */
.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--paper);
    color: var(--accent);
    margin-bottom: 1.1rem;
    transition:
        background-color var(--duration-base) var(--ease-out),
        color var(--duration-base) var(--ease-out),
        transform var(--duration-base) var(--ease-out);
}

.card-icon svg {
    width: 24px;
    height: 24px;
}

.card-link:hover .card-icon {
    background-color: var(--accent);
    color: #fff;
    transform: scale(1.05);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--ink);
    transition: color var(--duration-fast) var(--ease-out);
}

.card-link:hover .card-title {
    color: var(--accent);
}

.card-desc {
    font-size: 0.86rem;
    color: var(--ink-light);
    line-height: 1.7;
    flex: 1;
    margin-bottom: var(--space-sm);
}

/* 箭头行 */
.card-footer-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-top: auto;
}

.card-arrow {
    font-size: 1.1rem;
    color: var(--ink-faint);
    transition:
        transform var(--duration-base) var(--ease-spring),
        color var(--duration-base) var(--ease-out);
    font-weight: 300;
    margin-left: auto;
}

.card-link:hover .card-arrow {
    transform: translateX(6px);
    color: var(--accent);
}

.card-static {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.card-static .card-icon {
    background-color: var(--paper);
    color: var(--ink-muted);
}

/* ================================================================
   最新动态区
   ================================================================ */
.updates-section {
    padding: var(--space-2xl) 0;
    background-color: var(--surface);
    border-top: 1px solid var(--border-light);
}

.updates-list {
    max-width: 680px;
    margin: 0 auto;
}

.update-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 0.95rem var(--space-sm);
    border-bottom: 1px solid var(--divider);
    transition:
        background-color var(--duration-fast) var(--ease-out),
        padding-left var(--duration-base) var(--ease-out);
    border-radius: var(--radius-sm);
    position: relative;
}

/* 左侧小圆点标记 */
.update-item::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background-color: var(--border);
    transition: background-color var(--duration-fast) var(--ease-out);
}

.update-item:hover {
    background-color: var(--accent-subtle);
    padding-left: 0.9rem;
    border-bottom-color: transparent;
}

.update-item:hover::before {
    background-color: var(--accent);
}

.update-date {
    font-size: 0.78rem;
    color: var(--ink-muted);
    white-space: nowrap;
    min-width: 90px;
    font-family: var(--font-mono);
    letter-spacing: 0.03em;
}

.update-tag {
    display: inline-block;
    padding: 0.16rem 0.55rem;
    font-size: 0.7rem;
    font-weight: 500;
    border-radius: var(--radius-xs);
    white-space: nowrap;
    letter-spacing: 0.04em;
    flex-shrink: 0;
}

.tag-tutorial {
    background-color: rgba(74, 103, 65, 0.1);
    color: #4a6741;
}

.tag-tool {
    background-color: rgba(184, 117, 59, 0.1);
    color: #9e6b3a;
}

.tag-note {
    background-color: rgba(120, 100, 70, 0.1);
    color: #6b5a3e;
}

.tag-python {
    background-color: rgba(60, 100, 140, 0.1);
    color: #3c648c;
}

.tag-biostat {
    background-color: rgba(140, 90, 140, 0.1);
    color: #7a4e8c;
}

.tag-pharma {
    background-color: rgba(180, 70, 60, 0.1);
    color: #a04040;
}

.tag-server {
    background-color: rgba(180, 110, 40, 0.1);
    color: #9e6a30;
}

.tag-archive {
    background-color: rgba(60, 110, 120, 0.1);
    color: #3c6e78;
}

.tag-ai {
    background-color: rgba(90, 90, 110, 0.1);
    color: #5a5a6e;
}

.update-title {
    font-size: 0.94rem;
    color: var(--ink);
    font-weight: 450;
    transition: color var(--duration-fast) var(--ease-out);
    flex: 1;
}

.update-title:hover {
    color: var(--amber);
}

/* 空态 */
.updates-empty {
    text-align: center;
    padding: var(--space-xl) 0;
    color: var(--ink-muted);
}

.updates-empty-icon {
    display: block;
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.4;
}

.updates-empty-text {
    font-size: 0.95rem;
    color: var(--ink-muted);
}

/* ================================================================
   搜索框
   ================================================================ */
.search-box {
    max-width: 860px;
    margin: 0 auto var(--space-xl);
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.78rem 1.15rem;
    padding-left: 2.7rem;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background-color: var(--surface);
    color: var(--ink);
    transition: all var(--duration-fast) var(--ease-out);
    outline: none;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

.search-input::placeholder {
    color: var(--ink-faint);
}

.search-icon {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ink-muted);
    pointer-events: none;
}

/* ================================================================
   分类标签栏
   ================================================================ */
.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.filter-tab {
    padding: 0.45rem 1.15rem;
    font-size: 0.84rem;
    font-weight: 450;
    color: var(--ink-light);
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    font-family: var(--font-sans);
}

.filter-tab:hover {
    border-color: var(--amber);
    color: var(--amber);
}

.filter-tab.active {
    background-color: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ================================================================
   教程/笔记卡片列表
   ================================================================ */
.content-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.content-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
    transition: all var(--duration-base) var(--ease-out);
    display: flex;
    flex-direction: column;
}

.content-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 2.5px;
    background-color: var(--accent);
    border-radius: 0 2px 2px 0;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--duration-base) var(--ease-out);
    opacity: 0;
}

.content-card:hover {
    border-color: var(--accent);
    box-shadow: 0 6px 20px rgba(74, 103, 65, 0.06);
    transform: translateY(-2px);
}

.content-card:hover::before {
    transform: scaleY(1);
    opacity: 1;
}

.content-card-header {
    margin-bottom: var(--space-sm);
}

.content-card-title {
    font-size: 1.08rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--ink);
    transition: color var(--duration-fast) var(--ease-out);
}

.content-card:hover .content-card-title {
    color: var(--accent);
}

.content-card-meta {
    font-size: 0.76rem;
    color: var(--ink-muted);
    font-family: var(--font-mono);
    margin-bottom: var(--space-xs);
}

.content-card-tags {
    display: flex;
    gap: 0.3rem;
    flex-wrap: wrap;
    margin-bottom: var(--space-sm);
}

.content-card-desc {
    font-size: 0.86rem;
    color: var(--ink-light);
    line-height: 1.7;
    flex: 1;
    margin-bottom: var(--space-md);
}

.content-card-footer {
    margin-top: auto;
}

/* ================================================================
   工具卡片
   ================================================================ */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.tool-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
    transition: all var(--duration-base) var(--ease-out);
    display: flex;
    flex-direction: column;
}

.tool-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 2.5px;
    background-color: var(--accent);
    border-radius: 0 2px 2px 0;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--duration-base) var(--ease-out);
    opacity: 0;
}

.tool-card:hover {
    border-color: var(--accent);
    box-shadow: 0 6px 20px rgba(74, 103, 65, 0.06);
    transform: translateY(-2px);
}

.tool-card:hover::before {
    transform: scaleY(1);
    opacity: 1;
}

.tool-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
}

.tool-card-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.25rem;
    transition: color var(--duration-fast) var(--ease-out);
}

.tool-card:hover .tool-card-title {
    color: var(--accent);
}

.tool-version {
    font-size: 0.7rem;
    color: var(--ink-muted);
    font-family: var(--font-mono);
    background-color: var(--paper);
    padding: 0.1rem 0.4rem;
    border-radius: var(--radius-xs);
    letter-spacing: 0.03em;
}

.tool-platform {
    font-size: 0.82rem;
    color: var(--ink-light);
    margin-bottom: var(--space-sm);
}

.tool-desc {
    font-size: 0.86rem;
    color: var(--ink-light);
    line-height: 1.7;
    flex: 1;
    margin-bottom: var(--space-md);
}

.tool-card-footer {
    display: flex;
    gap: var(--space-xs);
    margin-top: auto;
}

/* ================================================================
   笔记列表
   ================================================================ */
.notes-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: var(--space-xl);
}

/* 笔记列表在内容区内居中 */
.notes-layout .notes-list {
    width: 100%;
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.notes-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.note-item {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
    transition: all var(--duration-base) var(--ease-out);
}

.note-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 2.5px;
    background-color: var(--accent);
    border-radius: 0 2px 2px 0;
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--duration-base) var(--ease-out);
    opacity: 0;
}

.note-item:hover {
    border-color: var(--accent);
    box-shadow: 0 6px 20px rgba(74, 103, 65, 0.06);
    transform: translateY(-2px);
}

.note-item:hover::before {
    transform: scaleY(1);
    opacity: 1;
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-sm);
}


.note-title {
    font-size: 1.12rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.35rem;
    transition: color var(--duration-fast) var(--ease-out);
}

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

.note-meta {
    font-size: 0.8rem;
    color: var(--ink-muted);
    font-family: var(--font-mono);
}

.note-tags {
    display: flex;
    gap: 0.3rem;
    margin-bottom: var(--space-sm);
    flex-wrap: wrap;
}

.note-excerpt {
    font-size: 0.88rem;
    color: var(--ink-light);
    line-height: 1.75;
    margin-bottom: var(--space-sm);
}

.note-readmore {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--amber);
    transition: color var(--duration-fast) var(--ease-out);
}

.note-readmore:hover {
    color: var(--accent);
}

/* --- 侧边栏 --- */
.sidebar {
    position: sticky;
    top: 90px;
    height: fit-content;
}

.sidebar-block {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--ink);
}

.tag-cloud {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
}

.tag-cloud-item {
    display: inline-block;
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
    color: var(--ink-light);
    background-color: var(--paper);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
    cursor: pointer;
}

.tag-cloud-item:hover {
    background-color: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* 宽屏：标签卡片收窄，并固定在视口最右侧 */
@media (min-width: 1200px) {
    .notes-layout {
        grid-template-columns: minmax(0, 1fr);
    }
    .notes-layout .sidebar {
        position: fixed;
        top: 160px;
        right: 28px;
        width: 200px;
        z-index: 60;
    }
    .notes-layout .sidebar-block {
        padding: var(--space-sm);
    }
}

/* ================================================================
   Markdown 内容渲染区
   ================================================================ */
.markdown-body {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
    line-height: 1.85;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
    color: var(--ink);
}

.markdown-body h1 {
    font-size: 1.8rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: var(--space-xs);
}

.markdown-body h2 {
    font-size: 1.35rem;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: var(--space-xs);
}

.markdown-body p {
    margin-bottom: var(--space-sm);
    color: var(--ink);
}

.markdown-body ul,
.markdown-body ol {
    margin-bottom: var(--space-sm);
    padding-left: var(--space-lg);
}

.markdown-body li {
    margin-bottom: 0.3rem;
}

.markdown-body code {
    font-family: var(--font-mono);
    background-color: var(--paper);
    padding: 0.18rem 0.4rem;
    border-radius: var(--radius-xs);
    font-size: 0.88em;
    color: var(--amber);
}

.markdown-body pre {
    background-color: #f5f2ec;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--space-sm);
    border: 1px solid var(--border);
}

.markdown-body pre code {
    background-color: transparent;
    color: var(--ink);
    padding: 0;
    font-size: 0.85rem;
}

.markdown-body blockquote {
    border-left: 3px solid var(--accent);
    padding: 0.5rem 0 0.5rem var(--space-md);
    margin: 0 0 var(--space-sm);
    color: var(--ink-light);
    background-color: var(--accent-subtle);
    border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-sm);
}

.markdown-body th,
.markdown-body td {
    border: 1px solid var(--border);
    padding: 0.55rem 0.75rem;
    text-align: left;
}

.markdown-body th {
    background-color: var(--paper);
    font-weight: 600;
    color: var(--accent);
    font-family: var(--font-serif);
}

.markdown-body tr:nth-child(even) {
    background-color: var(--paper);
}

/* ================================================================
   页脚
   ================================================================ */
.site-footer {
    background-color: #363631;
    color: #d8d3ca;
    padding: var(--space-md) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.footer-copyright {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    font-family: var(--font-serif);
    color: #fff;
}

.footer-desc {
    font-size: 0.75rem;
    opacity: 0.6;
}

.footer-icp,
.footer-beian {
    font-size: 0.72rem;
    opacity: 0.45;
    margin-top: 0.1rem;
}

.footer-contact {
    text-align: right;
    font-size: 0.75rem;
    opacity: 0.65;
}

.footer-contact p {
    margin-bottom: 0.15rem;
}

.site-footer a {
    color: #e2dcd0;
    opacity: 0.8;
    transition: opacity var(--duration-fast) var(--ease-out);
}

.site-footer a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* ================================================================
   动画系统
   ================================================================ */

/* --- 页面加载：Hero 逐项淡入 --- */
.hero-animate .hero-eyebrow,
.hero-animate .hero-title,
.hero-animate .hero-rule,
.hero-animate .hero-subtitle,
.hero-animate .hero-cta {
    opacity: 0;
    transform: translateY(20px);
}

.hero-animate.hero-visible .hero-eyebrow {
    animation: fadeUpIn var(--duration-slow) var(--ease-out) 0.02s forwards;
}

.hero-animate.hero-visible .hero-title {
    animation: fadeUpIn var(--duration-slow) var(--ease-out) 0.08s forwards;
}

.hero-animate.hero-visible .hero-rule {
    animation: fadeUpIn var(--duration-slow) var(--ease-out) 0.20s forwards;
}

.hero-animate.hero-visible .hero-subtitle {
    animation: fadeUpIn var(--duration-slow) var(--ease-out) 0.30s forwards;
}

.hero-animate.hero-visible .hero-cta {
    animation: fadeUpIn var(--duration-slow) var(--ease-out) 0.42s forwards;
}

@keyframes fadeUpIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- 统计条数字弹入 --- */
@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.92);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.stats-item.revealed .stats-number {
    animation: countUp var(--duration-slow) var(--ease-out) forwards;
}

.stats-item.revealed .stats-label {
    animation: fadeUpIn var(--duration-slow) var(--ease-out) forwards;
}

/* --- 滚动显现 --- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition:
        opacity var(--duration-slow) var(--ease-out),
        transform var(--duration-slow) var(--ease-out);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.scroll-reveal:nth-child(1) { transition-delay: 0.01s; }
.scroll-reveal:nth-child(2) { transition-delay: 0.07s; }
.scroll-reveal:nth-child(3) { transition-delay: 0.13s; }
.scroll-reveal:nth-child(4) { transition-delay: 0.19s; }
.scroll-reveal:nth-child(5) { transition-delay: 0.05s; }
.scroll-reveal:nth-child(6) { transition-delay: 0.11s; }

.scroll-reveal.revealed:nth-child(1),
.scroll-reveal.revealed:nth-child(2),
.scroll-reveal.revealed:nth-child(3),
.scroll-reveal.revealed:nth-child(4),
.scroll-reveal.revealed:nth-child(5),
.scroll-reveal.revealed:nth-child(6) {
    transition-delay: 0s;
}

/* --- 减少动画偏好 --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .hero-animate .hero-eyebrow,
    .hero-animate .hero-title,
    .hero-animate .hero-rule,
    .hero-animate .hero-subtitle,
    .hero-animate .hero-cta {
        opacity: 1;
        transform: none;
    }

    .scroll-reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ================================================================
   响应式设计
   ================================================================ */

@media (min-width: 1920px) {
    :root {
        --container-max: 1480px;
        --container-padding: 2.5rem;
    }
    .hero-title {
        font-size: 4rem;
    }
    .hero-section::before {
        width: 700px;
        height: 700px;
    }
    .hero-section::after {
        width: 560px;
        height: 560px;
    }
}

@media (max-width: 1440px) {
    :root {
        --container-max: 1200px;
    }
    .hero-title {
        font-size: 3rem;
    }
}

@media (max-width: 1366px) {
    :root {
        --container-max: 1160px;
        --container-padding: 1.5rem;
    }
    .hero-title {
        font-size: 2.7rem;
    }
    .cards-grid {
        gap: 1.15rem;
    }
    .content-grid {
        gap: 1.15rem;
    }
}

@media (max-width: 1024px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .content-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .tools-grid {
        grid-template-columns: 1fr;
    }
    .notes-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: static;
        margin-top: var(--space-lg);
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    .footer-contact {
        text-align: center;
    }
    .hero-title {
        font-size: 2.3rem;
    }
    .hero-section {
        padding: var(--space-2xl) 0 var(--space-xl);
    }
    .hero-section::before,
    .hero-section::after {
        display: none;
    }
    .stats-list {
        gap: var(--space-lg);
    }
}

@media (max-width: 640px) {
    .nav-container {
        height: auto;
        min-height: 58px;
        flex-direction: column;
        padding-top: 0.5rem;
        padding-bottom: 0.5rem;
        gap: 0.35rem;
    }
    .nav-list {
        gap: 0.1rem;
    }
    .nav-link {
        padding: 0.32rem 0.6rem;
        font-size: 0.78rem;
    }
    .cards-grid {
        grid-template-columns: 1fr;
    }
    .content-grid {
        grid-template-columns: 1fr;
    }
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    .hero-cta .btn {
        width: 100%;
        max-width: 260px;
    }
    .update-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }
    .update-item::before {
        display: none;
    }
    .markdown-body {
        padding: var(--space-md);
    }
    .hero-title {
        font-size: 1.85rem;
    }
    .hero-section {
        padding: var(--space-xl) 0;
    }
    .section-title {
        font-size: 1.3rem;
    }
    .stats-list {
        flex-direction: column;
        gap: var(--space-sm);
    }
    .stats-divider {
        width: 40px;
        height: 1px;
        margin: 0 auto;
    }
}

/* ================================================================
   手机端提示弹窗
   ================================================================ */
.mobile-notice {
    display: none;
}

@media (max-width: 768px) {
    .mobile-notice {
        display: flex;
        position: fixed;
        inset: 0;
        z-index: 999;
        align-items: center;
        justify-content: center;
        background-color: rgba(30, 27, 24, 0.55);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        padding: var(--container-padding);
    }

        .mobile-notice-box {
        background-color: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        padding: var(--space-xl) var(--space-md);
        text-align: center;
        max-width: 360px;
        width: 100%;
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    }

    .mobile-notice-box p {
        color: var(--ink);
        font-size: 1rem;
        line-height: 1.6;
        margin: 0;
    }

    .mobile-notice-box p + p {
        margin-top: var(--space-xs);
        color: var(--ink-muted);
        font-size: 0.9rem;
    }

    .mobile-notice-btn {
        display: inline-block;
        margin-top: var(--space-md);
        padding: 0.55rem 1.6rem;
        font-size: 0.88rem;
        font-weight: 500;
        font-family: var(--font-sans);
        color: #fff;
        background-color: var(--accent);
        border: none;
        border-radius: var(--radius-md);
        cursor: pointer;
        transition: background-color var(--duration-fast) var(--ease-out);
    }

    .mobile-notice-btn:hover {
        background-color: var(--accent-dark);
    }
}