/* ==========================================
   Jay's pub - 青夜之森 (Blue Moon Forest)
   浅色：森语暖底 + 蓝色强调
   深色：月夜暗底 + 青色强调
   ========================================== */

/* ---------- CSS 变量 (浅色主题 - 默认) ---------- */
:root {
  /* 浅色 -- 冷蓝灰底，与深色同色系 */
  --color-bg:         #f0f3f7;   /* 冷蓝灰底 */
  --color-surface:    #ffffff;   /* 纯白卡片 */
  --color-text:       #191c22;   /* 深蓝黑 */
  --color-text-muted: #586278;   /* 蓝灰 */
  --color-text-light: #8c91a3;   /* 浅蓝灰 */
  --color-border:     #e2e5ed;   /* 冷灰边框 */
  --color-accent:     #436fd1;   /* 蓝 h222 */
  --color-accent-hover:#2e5bbd;  /* 深蓝 h222 */

  /* 毛玻璃导航背景 */
  --header-bg: rgba(240, 243, 247, 0.92);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Noto Sans SC", system-ui, -apple-system, sans-serif;

  --container-max: 720px;
  --header-height: 60px;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
}

/* 深色主题 */
:root[data-theme="dark"] {
  /* 月夜（深色）-- 与浅色同色相 h222，提亮适配暗底 */
  --color-bg:         #181a23;   /* 深蓝黑底 */
  --color-surface:    #202230;   /* 暗蓝卡片 */
  --color-text:       #e4e6ef;   /* 浅灰白 */
  --color-text-muted: #969aac;   /* 中灰 */
  --color-text-light: #6b7084;   /* 暗灰 */
  --color-border:     #2c2f3d;   /* 暗蓝边框 */
  --color-accent:     #7d9ee6;   /* 月光蓝 h222 */
  --color-accent-hover:#94b1ed;  /* 亮月光蓝 h222 */

  --header-bg: rgba(24, 26, 35, 0.92);
}

/* 自动跟随系统（仅在用户未手动切换时生效） */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:         #181a23;
    --color-surface:    #202230;
    --color-text:       #e4e6ef;
    --color-text-muted: #969aac;
    --color-text-light: #6b7084;
    --color-border:     #2c2f3d;
    --color-accent:     #7d9ee6;
    --color-accent-hover:#94b1ed;

    --header-bg: rgba(24, 26, 35, 0.92);
  }
}

/* ---------- 无障碍：焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 按钮去掉默认 outline，用自定义 */
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 菜单展开时锁定页面滚动 */
.body--no-scroll {
  overflow: hidden;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

.section {
  padding: var(--space-xl) 0;
}

.section__title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
}

.link-underline {
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.link-underline:hover {
  border-bottom-color: var(--color-accent);
}

/* ==========================================
   头部导航
   ========================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
}

/* 毛玻璃效果移至伪元素，避免 header 成为 fixed 子元素的包含块 */
.header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-text);
  transition: color 0.2s;
}

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

/* 桌面端导航 */
.nav {
  position: relative;
}

.nav__list {
  display: flex;
  gap: var(--space-md);
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav__icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width 0.2s;
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link:focus-visible::after {
  width: 100%;
}

/* 头部操作区 */
.header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 语言切换 */
.header__lang {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-right: 4px;
}

.header__lang-link {
  font-size: 0.78rem;
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--color-text-light);
  transition: color 0.2s, background 0.2s;
}

.header__lang-link:hover {
  color: var(--color-text);
  background: var(--color-border);
}

.header__lang-link--active {
  color: var(--color-accent);
  font-weight: 600;
  pointer-events: none;
}

/* 主题切换按钮 */
.header__theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: color 0.2s, background 0.2s;
}

.header__theme-toggle:hover {
  color: var(--color-accent);
  background: var(--color-border);
}

/* 默认显示太阳图标（浅色模式），隐藏月亮 */
.header__theme-icon--moon { display: none; }
.header__theme-icon--sun  { display: block; }

/* 深色模式下显示月亮，隐藏太阳 */
:root[data-theme="dark"] .header__theme-icon--moon { display: block; }
:root[data-theme="dark"] .header__theme-icon--sun  { display: none; }

/* 浅色模式过渡动画 */
body,
.header,
.about,
.blog-preview,
.work-card,
.footer {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* 移动端菜单按钮 */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.header__menu-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  transition: transform 0.3s, opacity 0.3s;
  transform-origin: center;
}

/* 菜单展开时汉堡图标变叉号 */
.header--menu-open .header__menu-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.header--menu-open .header__menu-bar:nth-child(2) {
  opacity: 0;
}

.header--menu-open .header__menu-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ==========================================
   首屏 Hero
   ========================================== */
.hero {
  text-align: center;
  padding-top: calc(var(--space-xl) + var(--space-lg));
  padding-bottom: var(--space-xl);
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__avatar {
  width: 120px;
  height: 120px;
  margin-bottom: var(--space-md);
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-border);
  border: 2px solid var(--color-border);
}

.hero__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__avatar svg {
  width: 100%;
  height: 100%;
}

.hero__name {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.hero__tagline {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.hero__intro {
  max-width: 480px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.85;
}

/* ==========================================
   关于区
   ========================================== */
.about {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.about__text p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

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

.about__meta {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.about__meta li {
  padding: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.about__meta li:last-child {
  border-bottom: none;
}

.about__label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-light);
  margin-bottom: 2px;
}

/* ==========================================
   首页导航卡片
   ========================================== */
.nav-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.nav-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.nav-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.nav-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--color-bg);
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.nav-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.nav-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ==========================================
   作品与技能区
   ========================================== */
.works__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.work-card {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.work-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.work-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.work-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.work-card__desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ==========================================
   文章卡片列表 (/posts/)
   ========================================== */
.post-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.post-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.post-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.post-card__link {
  display: block;
  padding: var(--space-md);
}

.post-card__title {
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.35rem;
  transition: color 0.2s;
}

.post-card:hover .post-card__title {
  color: var(--color-accent);
}

.post-card__meta {
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.post-card__divider {
  color: var(--color-text-light);
  user-select: none;
}

.post-card__tag {
  font-size: 0.75rem;
  padding: 1px 6px;
  border-radius: 2px;
  background: var(--color-border);
  color: var(--color-text-light);
}

.post-card__excerpt {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.pagination__link {
  font-size: 0.9rem;
  color: var(--color-accent);
  transition: color 0.2s;
}

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

.pagination__link--disabled {
  color: var(--color-text-light);
  cursor: default;
  pointer-events: none;
}

.pagination__info {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-variant-numeric: tabular-nums;
}

/* ==========================================
   博客预览区
   ========================================== */
.blog-preview {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.blog-preview__list {
  display: flex;
  flex-direction: column;
}

.blog-preview__item {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color 0.2s;
}

.blog-preview__item:last-child {
  border-bottom: none;
}

.blog-preview__item:hover {
  color: var(--color-accent);
}

.blog-preview__date {
  flex-shrink: 0;
  font-size: 0.82rem;
  color: var(--color-text-light);
  font-variant-numeric: tabular-nums;
}

.blog-preview__title {
  font-size: 0.95rem;
  font-weight: 500;
}

.blog-preview__more {
  margin-top: var(--space-md);
  font-size: 0.9rem;
}

/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag-cloud__item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
  transition: border-color 0.2s, color 0.2s;
}

.tag-cloud__item:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.tag-cloud__count {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* ==========================================
   联系区
   ========================================== */
.contact {
  text-align: center;
}

.contact__text {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.contact__email {
  display: inline-block;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.contact__email:hover {
  border-bottom-color: var(--color-accent);
}

/* ==========================================
   页脚
   ========================================== */
.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__social {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-text-muted);
  transition: color 0.2s, background 0.2s;
}

.footer__social-link:hover {
  color: var(--color-accent);
  background: var(--color-border);
}

.footer__copyright {
  font-size: 0.82rem;
  color: var(--color-text-light);
}

/* ==========================================
   文章页
   ========================================== */
.post {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.post__container {
  max-width: var(--container-max);
}

/* 文章卡片 */
.post__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-lg);
}

/* 文章头部 */
.post__header {
  margin-bottom: var(--space-lg);
}

.post__title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
  position: relative;
  display: inline-block;
}

/* 标题底部的强调线（section__title 同款） */
.post__title::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-accent);
}

.post__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-sm);
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.post__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.post__meta-divider {
  color: var(--color-text-light);
  user-select: none;
}

.post__tag,
.post__tag--link {
  display: inline-block;
  font-size: 0.78rem;
  padding: 2px 10px;
  border-radius: 3px;
  background: var(--color-border);
  color: var(--color-text-muted);
}

.post__tag--link {
  transition: background 0.2s, color 0.2s;
}

.post__tag--link:hover {
  background: var(--color-accent);
  color: #fff;
}

/* 文章正文排版 */
.post__body {
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--color-text);
}

.post__body h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--color-border);
}

.post__body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.post__body h4,
.post__body h5,
.post__body h6 {
  font-weight: 600;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.post__body p {
  margin-bottom: var(--space-sm);
}

.post__body a {
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.post__body a:hover {
  border-bottom-color: var(--color-accent);
}

.post__body blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  border-left: 3px solid var(--color-accent);
  background: var(--color-surface);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  color: var(--color-text-muted);
}

.post__body blockquote p:last-child {
  margin-bottom: 0;
}

.post__body ul,
.post__body ol {
  margin: var(--space-sm) 0;
  padding-left: 1.5rem;
}

.post__body ul {
  list-style: disc;
}

.post__body ol {
  list-style: decimal;
}

.post__body li {
  margin-bottom: 0.35rem;
}

.post__body li::marker {
  color: var(--color-accent);
}

/* 代码块 */
.post__body pre {
  margin: var(--space-md) 0;
  padding: var(--space-md);
  border-radius: 6px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}

.post__body :not(pre) > code {
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--color-border);
  color: var(--color-accent);
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

.post__body pre code {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  background: none;
  padding: 0;
  color: inherit;
}

.post__body img {
  border-radius: 4px;
  margin: var(--space-md) auto;
}

.post__body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-lg) 0;
}

/* 表格 */
.post__body table {
  width: 100%;
  margin: var(--space-md) 0;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.post__body thead {
  border-bottom: 2px solid var(--color-accent);
}

.post__body th {
  padding: 0.6rem 0.8rem;
  text-align: left;
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

.post__body td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--color-border);
}

.post__body tbody tr:hover {
  background: var(--color-border);
}

/* 文章底部 */
.post__footer {
  margin-top: var(--space-lg);
}

.post__footer-divider {
  height: 1px;
  background: var(--color-border);
  margin-bottom: var(--space-md);
  opacity: 0.6;
}

.post__nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
}

.post__nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  max-width: 48%;
  color: var(--color-text-muted);
  transition: color 0.2s;
  line-height: 1.4;
}

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

.post__nav-link--next {
  text-align: right;
  margin-left: auto;
}

.post__nav-link svg {
  flex-shrink: 0;
}

.post__nav-link--disabled {
  color: var(--color-text-light);
  cursor: default;
  pointer-events: none;
}

/* ==========================================
   阅读进度条
   ========================================== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-accent);
  z-index: 200;
  width: 0;
  transition: width 0.1s linear;
}

/* ==========================================
   回到顶部按钮
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 50;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, color 0.2s, border-color 0.2s, background 0.3s;
}

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

.back-to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* 文章页响应式 */
@media (max-width: 480px) {
  .post__title {
    font-size: 1.45rem;
  }

  .post__body {
    font-size: 0.98rem;
  }

  .post__card {
    padding: var(--space-md);
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
  }
}

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

/* 平板及以下 */
@media (max-width: 768px) {
  :root {
    --space-xl: 4rem;
    --space-lg: 3rem;
  }

  .section {
    padding: var(--space-lg) 0;
  }

  /* 移动端导航 */
  .header__menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed !important;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s, visibility 0.25s;

    /* 半透明背景 + 毛玻璃模糊 */
    background-color: rgba(255, 255, 255, 0.60);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
  }

  /* 深色主题下菜单背景 */
  :root[data-theme="dark"] .nav {
    background-color: rgba(32, 34, 48, 0.60);
  }

  .nav--open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav__list {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .nav__link {
    font-size: 1.1rem;
  }

  .nav__icon {
    width: 20px;
    height: 20px;
  }

  .nav-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  /* 关于区堆叠 */
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  /* 作品卡片两列 */
  .works__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero__name {
    font-size: 2rem;
  }
}

/* 手机端 */
@media (max-width: 480px) {
  :root {
    --space-xl: 3rem;
    --space-lg: 2rem;
  }

  .nav-cards {
    grid-template-columns: 1fr;
  }

  body {
    font-size: 15px;
  }

  .section__title {
    font-size: 1.3rem;
  }

  .hero {
    padding-top: calc(var(--space-lg) + var(--space-md));
  }

  .hero__avatar {
    width: 96px;
    height: 96px;
  }

  .hero__name {
    font-size: 1.75rem;
  }

  .hero__intro {
    font-size: 0.9rem;
  }

  /* 作品卡片单列 */
  .works__grid {
    grid-template-columns: 1fr;
  }

  /* 博客列表在小屏上折行 */
  .blog-preview__item {
    flex-direction: column;
    gap: 2px;
  }

  .contact__email {
    font-size: 1.1rem;
  }
}

/* 宽屏 */
@media (min-width: 768px) {
  .hero__intro {
    max-width: 580px;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-max: 1060px;
  }

  .hero__intro {
    max-width: 640px;
  }
}

@media (min-width: 1440px) {
  :root {
    --container-max: 1200px;
  }
}