@import url('https://fonts.googleapis.com/css2?family=Karla:wght@300;400;500;600;700&family=Playfair+Display+SC:wght@400;700&display=swap');

/* =====================
   CSS 自定义属性
   ===================== */
:root {
  --blue: #3bb1ff;
  --red: #ff5252;
  --black: #000000;
  --white: #ffffff;
  --off-white: #f5f5f0;
  --light-blue: #d0ecff;
  --light-red: #ffd6d6;
  --border: 3px solid #000000;
  --shadow: 5px 5px 0px #000000;
  --shadow-sm: 3px 3px 0px #000000;
  --shadow-lg: 8px 8px 0px #000000;
  --radius: 0px;
  --card-radius: 0px;
  --font-head: 'Playfair Display SC', Georgia, serif;
  --font-body: 'Karla', 'Helvetica Neue', Arial, sans-serif;
  --nav-h: 60px;
  --max-w: 1200px;
  --prose-w: 760px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--black);
  background: var(--off-white);
  padding-bottom: calc(var(--nav-h) + 8px);
}

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

a {
  color: var(--black);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

ul, ol, menu {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.2;
}

hr {
  border: none;
  border-top: 3px solid var(--black);
  margin: 12px 0 16px;
}

/* =====================
   导航（底部固定条）
   ===================== */
.nb-nav-wrap {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  border-top: var(--border);
  background: var(--white);
}

.nb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  height: var(--nav-h);
  padding: 0 16px;
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
}

.nb-brand {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--black);
  text-decoration: none;
  padding: 8px 12px;
  background: var(--blue);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
  flex-shrink: 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: box-shadow 0.15s, transform 0.15s;
}

.nb-brand:hover {
  box-shadow: none;
  transform: translate(3px, 3px);
  color: var(--black);
}

.nb-menu-details {
  position: relative;
  flex: 1;
}

.nb-menu-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 10px 16px;
  min-height: 40px;
  border: var(--border);
  background: var(--off-white);
  box-shadow: var(--shadow-sm);
  user-select: none;
  list-style: none;
  transition: box-shadow 0.15s, transform 0.15s;
}

.nb-menu-toggle::-webkit-details-marker { display: none; }
.nb-menu-toggle::marker { display: none; }

.nb-menu-toggle::after {
  content: '▲';
  font-size: 0.7rem;
}

.nb-menu-details[open] .nb-menu-toggle::after {
  content: '▼';
}

.nb-menu-toggle:hover {
  background: var(--blue);
  box-shadow: none;
  transform: translate(3px, 3px);
}

.nb-menu-list {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  min-width: 280px;
  max-width: 360px;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 200;
}

.nb-menu-list li {
  border-bottom: 2px solid var(--black);
}

.nb-menu-list li:last-child {
  border-bottom: none;
}

.nb-menu-list li a {
  display: block;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--black);
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: background 0.1s;
}

.nb-menu-list li a:hover {
  background: var(--blue);
  color: var(--black);
}

.nav-cta {
  margin-left: auto;
  flex-shrink: 0;
}

/* =====================
   按钮
   ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  border: var(--border);
  cursor: pointer;
  transition: box-shadow 0.15s, transform 0.15s;
  min-height: 40px;
  white-space: nowrap;
}

.btn-primary {
  background: var(--red);
  color: var(--white);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  box-shadow: none;
  transform: translate(5px, 5px);
  color: var(--white);
}

.btn-outline {
  background: var(--white);
  color: var(--black);
  box-shadow: var(--shadow);
}

.btn-outline:hover {
  background: var(--blue);
  box-shadow: none;
  transform: translate(5px, 5px);
  color: var(--black);
}

.btn-cta {
  background: var(--blue);
  color: var(--black);
  box-shadow: var(--shadow-sm);
}

.btn-cta:hover {
  box-shadow: none;
  transform: translate(3px, 3px);
  color: var(--black);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.82rem;
  min-height: 34px;
}

.btn-block {
  width: 100%;
  display: flex;
}

/* =====================
   页面包装
   ===================== */
.page-wrapper {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 16px;
}

/* =====================
   Hero（首页）
   ===================== */
.hero {
  position: relative;
  min-height: 45vh;
  padding: 40px 0 32px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-bg-text {
  position: absolute;
  top: 50%;
  right: -20px;
  transform: translateY(-50%);
  font-family: var(--font-head);
  font-size: clamp(80px, 18vw, 200px);
  font-weight: 700;
  color: var(--blue);
  opacity: 0.12;
  pointer-events: none;
  line-height: 1;
  user-select: none;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  z-index: 1;
}

.hero-text {
  text-align: right;
}

.hero-eyebrow {
  display: inline-block;
  background: var(--red);
  color: var(--white);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 12px;
  border: 2px solid var(--black);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.hero-text h1 {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--black);
}

.hero-desc {
  font-size: 1.05rem;
  color: #333;
  max-width: 560px;
  margin-left: auto;
  margin-bottom: 24px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.hero-media {
  border: var(--border);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-height: 320px;
}

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

/* =====================
   内页 Hero
   ===================== */
.inner-hero {
  position: relative;
  padding: 40px 0 32px;
  overflow: hidden;
  border-bottom: var(--border);
  margin-bottom: 0;
}

.inner-hero--accent { background: var(--red); color: var(--white); }
.inner-hero--blue { background: var(--blue); color: var(--black); }
.inner-hero--red { background: var(--red); color: var(--white); }
.inner-hero--dark { background: var(--black); color: var(--white); }

.inner-hero-bg-text {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  font-family: var(--font-head);
  font-size: clamp(60px, 14vw, 160px);
  font-weight: 700;
  opacity: 0.08;
  pointer-events: none;
  line-height: 1;
  user-select: none;
  color: currentColor;
}

.inner-hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.inner-hero-content h1 {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  margin-bottom: 12px;
  margin-top: 8px;
}

.inner-hero-content p {
  font-size: 1rem;
  line-height: 1.7;
  opacity: 0.9;
}

.inner-hero--accent .hero-eyebrow,
.inner-hero--red .hero-eyebrow {
  background: var(--black);
  color: var(--white);
}

.inner-hero--blue .hero-eyebrow {
  background: var(--black);
  color: var(--white);
}

.inner-hero--dark .hero-eyebrow {
  background: var(--red);
  color: var(--white);
}

/* =====================
   评测 Hero
   ===================== */
.review-hero {
  position: relative;
  background: var(--black);
  color: var(--white);
  padding: 40px 0 32px;
  overflow: hidden;
  border-bottom: var(--border);
}

.review-hero-bg-text {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  font-family: var(--font-head);
  font-size: clamp(60px, 14vw, 160px);
  font-weight: 700;
  opacity: 0.06;
  color: var(--blue);
  pointer-events: none;
  line-height: 1;
  user-select: none;
}

.review-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  gap: 32px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.review-hero-img-wrap {
  flex-shrink: 0;
  width: 280px;
  border: var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.review-hero-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.review-hero-text {
  flex: 1;
}

.review-hero-text h1 {
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  margin-top: 8px;
  margin-bottom: 12px;
}

.breadcrumb {
  font-size: 0.85rem;
  margin-bottom: 8px;
  opacity: 0.8;
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb span {
  margin: 0 6px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  margin-top: 10px;
  opacity: 0.85;
}

.meta-label {
  font-weight: 600;
  color: var(--blue);
}

.meta-sep { opacity: 0.5; }

/* =====================
   布局：侧边栏 + 主内容
   ===================== */
.layout-with-aside {
  display: flex;
  gap: 0;
  align-items: flex-start;
  margin-top: 0;
}

.sidebar {
  width: 260px;
  flex-shrink: 0;
  position: sticky;
  top: 16px;
  padding: 24px 16px 24px 0;
  align-self: flex-start;
}

.aside-block {
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 20px;
}

.aside-title {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--black);
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-links li {
  border-bottom: 1px solid #ddd;
}

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

.aside-links li a,
.aside-links a {
  display: block;
  padding: 8px 4px;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--black);
  transition: color 0.1s, background 0.1s;
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-links li a:hover,
.aside-links a:hover {
  color: var(--red);
  background: var(--light-blue);
  padding-left: 8px;
}

.aside-cta {
  background: var(--blue);
}

.aside-highlight {
  background: var(--light-red);
  border-color: var(--black);
}

.aside-highlight p {
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.aside-cta p {
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 12px;
  font-weight: 600;
}

.main-col {
  flex: 1;
  min-width: 0;
  padding: 24px 0 24px 16px;
  border-left: var(--border);
}

/* =====================
   主内容容器（契约结构: main > div.wrap > section > article）
   ===================== */
main {
  width: 100%;
}

.wrap {
  width: 100%;
}

.content-section {
  padding: 0;
}

.main-content {
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 32px;
  margin-bottom: 24px;
}

/* =====================
   排版：正文
   ===================== */
.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: #111;
  max-width: var(--prose-w);
}

.prose h2 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  padding-bottom: 6px;
}

.prose h2 + hr {
  margin-top: 0;
  margin-bottom: 1rem;
}

.prose h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.prose p {
  margin-bottom: 1.2em;
}

.prose ul, .prose ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.2em;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.4em;
}

.prose blockquote {
  border-left: 5px solid var(--blue);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: var(--light-blue);
  font-style: italic;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9rem;
}

.prose th {
  background: var(--black);
  color: var(--white);
  padding: 10px 14px;
  text-align: left;
  font-weight: 700;
  border: 2px solid var(--black);
}

.prose td {
  padding: 10px 14px;
  border: 2px solid var(--black);
  vertical-align: top;
}

.prose tr:nth-child(even) td {
  background: var(--light-blue);
}

.prose a {
  color: var(--black);
  font-weight: 600;
  text-decoration-color: var(--red);
}

.prose a:hover {
  color: var(--red);
}

.prose strong {
  font-weight: 700;
}

.prose code {
  background: #eee;
  border: 1px solid #ccc;
  padding: 2px 6px;
  font-size: 0.88em;
  font-family: monospace;
}

.prose pre {
  background: var(--black);
  color: var(--white);
  padding: 20px;
  overflow-x: auto;
  margin: 1.5em 0;
  border: var(--border);
}

/* =====================
   首页卡片列表（ul > li > article 结构）
   ===================== */
.section-title {
  font-family: var(--font-head);
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.cards-section {
  margin-top: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 0;
}

.card-grid > li {
  list-style: none;
}

.card {
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: box-shadow 0.15s, transform 0.15s;
}

.card:hover {
  box-shadow: none;
  transform: translate(5px, 5px);
}

.card-media {
  overflow: hidden;
  border-bottom: var(--border);
  max-height: 180px;
}

.card-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  transition: transform 0.3s;
}

.card:hover .card-thumb {
  transform: scale(1.03);
}

.card-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-tag {
  display: inline-block;
  background: var(--blue);
  color: var(--black);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border: 2px solid var(--black);
  width: fit-content;
}

.card-date {
  font-size: 0.8rem;
  color: #666;
  font-weight: 500;
}

.card-body h3 {
  font-size: 1rem;
  font-family: var(--font-head);
  line-height: 1.3;
}

.card-body h3 a {
  text-decoration: none;
  color: var(--black);
}

.card-body h3 a:hover {
  color: var(--red);
}

.card-body p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: #444;
  flex: 1;
}

.section-more {
  text-align: center;
  margin-top: 28px;
}

/* =====================
   排名列表
   ===================== */
.ranking-section {
  margin-top: 24px;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 0;
}

.rank-item {
  list-style: none;
}

.rank-card {
  display: flex;
  gap: 0;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: box-shadow 0.15s, transform 0.15s;
  align-items: stretch;
}

.rank-card:hover {
  box-shadow: none;
  transform: translate(5px, 5px);
}

.rank-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  flex-shrink: 0;
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  background: var(--off-white);
  border-right: var(--border);
  color: var(--black);
}

.rank-item--top .rank-num {
  background: var(--blue);
  color: var(--black);
  font-size: 1.8rem;
}

.rank-media {
  width: 120px;
  flex-shrink: 0;
  border-right: var(--border);
  overflow: hidden;
}

.rank-thumb {
  width: 120px;
  height: 100%;
  object-fit: cover;
  display: block;
  min-height: 100px;
}

.rank-info {
  flex: 1;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rank-info h3 {
  font-size: 1rem;
  font-family: var(--font-head);
}

.rank-info h3 a {
  text-decoration: none;
  color: var(--black);
}

.rank-info h3 a:hover { color: var(--red); }

.rank-info p {
  font-size: 0.88rem;
  color: #444;
  line-height: 1.6;
}

.rank-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: #666;
  margin-top: 4px;
}

/* =====================
   相关评测列表
   ===================== */
.related-list {
  gap: 0;
}

.related-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
}

.related-link:hover { color: var(--red); }

.related-title {
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--black);
}

.related-link:hover .related-title { color: var(--red); }

.related-date {
  font-size: 0.76rem;
  color: #888;
}

/* =====================
   评测页底部导航
   ===================== */
.review-footer-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
  padding-top: 24px;
  border-top: var(--border);
}

/* =====================
   页脚
   ===================== */
.nb-footer {
  border-top: var(--border);
  background: var(--white);
  margin-top: 48px;
  margin-bottom: calc(var(--nav-h) + 8px);
}

.footer-cta {
  background: var(--black);
  color: var(--white);
  padding: 40px 16px;
}

.footer-cta-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-cta-text {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
}

.footer-bottom {
  padding: 20px 16px;
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 0.85rem;
  color: #555;
  font-weight: 500;
}

.footer-nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: #444;
  min-height: 40px;
  display: flex;
  align-items: center;
  padding: 4px 0;
}

.footer-nav a:hover {
  color: var(--red);
}

/* =====================
   面包屑
   ===================== */
.breadcrumb {
  font-size: 0.82rem;
  margin-bottom: 8px;
  opacity: 0.8;
}

/* =====================
   动效（stagger 列表、卡片入场）
   ===================== */
@media (prefers-reduced-motion: no-preference) {
  .card-grid > li {
    animation: fadeInUp 0.4s both;
  }

  .card-grid > li:nth-child(1) { animation-delay: 0.05s; }
  .card-grid > li:nth-child(2) { animation-delay: 0.10s; }
  .card-grid > li:nth-child(3) { animation-delay: 0.15s; }
  .card-grid > li:nth-child(4) { animation-delay: 0.20s; }
  .card-grid > li:nth-child(5) { animation-delay: 0.25s; }
  .card-grid > li:nth-child(6) { animation-delay: 0.30s; }

  .rank-item {
    animation: fadeInUp 0.4s both;
  }

  .rank-item:nth-child(1) { animation-delay: 0.05s; }
  .rank-item:nth-child(2) { animation-delay: 0.10s; }
  .rank-item:nth-child(3) { animation-delay: 0.15s; }
  .rank-item:nth-child(4) { animation-delay: 0.20s; }
  .rank-item:nth-child(5) { animation-delay: 0.25s; }
  .rank-item:nth-child(6) { animation-delay: 0.30s; }
  .rank-item:nth-child(7) { animation-delay: 0.35s; }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* =====================
   移动端适配
   ===================== */
@media (max-width: 768px) {
  .layout-with-aside {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    position: static;
    padding: 16px 0 0;
    border-left: none;
    border-bottom: var(--border);
  }

  .main-col {
    padding: 16px 0;
    border-left: none;
  }

  .hero-text {
    text-align: left;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-desc {
    margin-left: 0;
  }

  .review-hero-inner {
    flex-direction: column;
    gap: 16px;
  }

  .review-hero-img-wrap {
    width: 100%;
  }

  .rank-card {
    flex-wrap: wrap;
  }

  .rank-media {
    width: 80px;
  }

  .rank-thumb {
    width: 80px;
  }

  .rank-num {
    width: 48px;
    font-size: 1.2rem;
  }

  .footer-cta-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .main-content {
    padding: 20px 16px;
  }

  .nb-menu-list {
    min-width: 240px;
    max-width: calc(100vw - 32px);
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .nb-brand {
    font-size: 0.75rem;
    padding: 6px 10px;
  }

  .hero-bg-text {
    font-size: 18vw;
    opacity: 0.08;
  }

  .page-wrapper {
    padding: 0 12px;
  }
}

/* =====================
   比较页专属
   ===================== */
.compare-prose table {
  font-size: 0.85rem;
}

/* =====================
   FAQ 专属
   ===================== */
.faq-prose h3 {
  background: var(--light-blue);
  border-left: 5px solid var(--blue);
  padding: 10px 16px;
  margin-bottom: 0;
}

/* =====================
   无障碍
   ===================== */
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}