/* ═══════════════════════════════════════════
   企业官方博客 - 全局样式
   设计理念：简洁 · 高端 · 自适应
   ═══════════════════════════════════════════ */

/* ── CSS 变量 ── */
:root {
  --color-primary: #0c1b33;
  --color-primary-light: #1a3058;
  --color-accent: #c4a35a;
  --color-accent-hover: #d4b76e;
  --color-bg: #faf9f7;
  --color-bg-alt: #f0eeea;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #5c5c5c;
  --color-text-muted: #8a8a8a;
  --color-border: #e5e2dc;
  --color-border-light: #f0eeea;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --shadow-sm: 0 1px 3px rgba(12, 27, 51, 0.06);
  --shadow-md: 0 4px 20px rgba(12, 27, 51, 0.08);
  --shadow-lg: 0 8px 40px rgba(12, 27, 51, 0.12);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --header-height: 72px;
  --container-max: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open {
  overflow: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ── 布局容器 ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ── 按钮 ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

/* ── 标签 ── */
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary-light);
  background: var(--color-bg-alt);
  border-radius: 4px;
}

/* ═══════════════════════════════════════════
   头部导航
   ═══════════════════════════════════════════ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: transparent;
  transition: all var(--transition);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.site-header.scrolled .logo-text,
.site-header.scrolled .main-nav a {
  color: var(--color-text);
}

.site-header.scrolled .nav-toggle span {
  background: var(--color-primary);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg {
  width: 20px;
  height: 20px;
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
  transition: color var(--transition);
}

.logo-sub {
  font-size: 11px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 2px;
  margin-top: -2px;
}

.site-header.scrolled .logo-sub {
  color: var(--color-text-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.main-nav a:hover {
  color: #fff;
}

.main-nav a:hover::after {
  width: 100%;
}

.site-header.scrolled .main-nav a:hover {
  color: var(--color-primary);
}

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ═══════════════════════════════════════════
   Hero 区域
   ═══════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(12, 27, 51, 0.88) 0%,
    rgba(12, 27, 51, 0.65) 50%,
    rgba(12, 27, 51, 0.45) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: calc(var(--header-height) + 60px) 0 80px;
  max-width: 680px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(196, 163, 90, 0.15);
  border: 1px solid rgba(196, 163, 90, 0.3);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.hero-label::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ═══════════════════════════════════════════
   数据概览
   ═══════════════════════════════════════════ */
.stats-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  padding: 40px 0;
  margin-top: -40px;
  position: relative;
  z-index: 2;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 40px 48px;
  box-shadow: var(--shadow-lg);
}

.stat-item {
  text-align: center;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-number span {
  font-size: 20px;
  color: var(--color-accent);
  margin-left: 2px;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 6px;
}

/* ═══════════════════════════════════════════
   文章卡片
   ═══════════════════════════════════════════ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.articles-grid--featured {
  grid-template-columns: repeat(3, 1fr);
}

.article-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-link {
  display: block;
  height: 100%;
}

.card-image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .card-image img {
  transform: scale(1.05);
}

.card-category {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: rgba(12, 27, 51, 0.75);
  backdrop-filter: blur(4px);
  border-radius: 4px;
}

.card-body {
  padding: 24px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.meta-dot {
  color: var(--color-border);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.45;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-excerpt {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 14px;
}

.card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.card-read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  transition: gap var(--transition);
}

.article-card:hover .card-read-more {
  gap: 8px;
}

/* 精选卡片加大 */
.card--featured .card-title {
  font-size: 20px;
}

/* ═══════════════════════════════════════════
   分类筛选
   ═══════════════════════════════════════════ */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  transition: all var(--transition);
}

.filter-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

/* ═══════════════════════════════════════════
   关于区域
   ═══════════════════════════════════════════ */
.about-section {
  background: var(--color-primary);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.about-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(196, 163, 90, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content .section-label {
  color: var(--color-accent);
}

.about-content .section-title {
  color: #fff;
  text-align: left;
}

.about-text {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: 32px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.about-feature {
  padding: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
}

.about-feature-icon {
  width: 40px;
  height: 40px;
  background: rgba(196, 163, 90, 0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  color: var(--color-accent);
}

.about-feature h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.about-feature p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.6;
}

.about-visual {
  position: relative;
}

.about-visual-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(8px);
}

.about-quote {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 24px;
  position: relative;
  padding-left: 20px;
  border-left: 3px solid var(--color-accent);
}

.about-quote-author {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

/* ═══════════════════════════════════════════
   订阅区域
   ═══════════════════════════════════════════ */
.subscribe-section {
  background: var(--color-bg-alt);
}

.subscribe-box {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 48px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.subscribe-box .section-title {
  font-size: 26px;
}

.subscribe-form {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.subscribe-input {
  flex: 1;
  padding: 12px 18px;
  font-size: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
  font-family: inherit;
}

.subscribe-input:focus {
  border-color: var(--color-primary);
}

.subscribe-input::placeholder {
  color: var(--color-text-muted);
}

.subscribe-msg {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-accent);
  display: none;
}

.subscribe-msg.show {
  display: block;
}

/* ═══════════════════════════════════════════
   文章详情页
   ═══════════════════════════════════════════ */
.page-article .site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.page-article .logo-text,
.page-article .main-nav a {
  color: var(--color-text);
}

.page-article .logo-sub {
  color: var(--color-text-muted);
}

.page-article .nav-toggle span {
  background: var(--color-primary);
}

.article-page {
  padding-top: var(--header-height);
}

.article-hero {
  background: var(--color-surface);
  padding: 40px 0 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  flex-wrap: wrap;
}

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

.breadcrumb-sep {
  color: var(--color-border);
}

.breadcrumb span:last-child {
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

#article-header {
  max-width: 760px;
  margin-bottom: 32px;
}

.article-category {
  display: inline-block;
  padding: 4px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(196, 163, 90, 0.1);
  border-radius: 4px;
  margin-bottom: 16px;
}

.article-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.35;
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.meta-author {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.article-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

#article-cover {
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 21 / 9;
}

#article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body-wrap {
  padding: 48px 0 80px;
}

.article-body {
  max-width: 760px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-bg-alt);
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin: 16px 0;
  padding-left: 0;
}

.article-body ul li,
.article-body ol li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.85;
  margin-bottom: 10px;
}

.article-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.article-body ol {
  counter-reset: ol-counter;
}

.article-body ol li {
  counter-increment: ol-counter;
  padding-left: 28px;
}

.article-body ol li::before {
  content: counter(ol-counter) ".";
  position: absolute;
  left: 0;
  font-weight: 600;
  color: var(--color-accent);
}

.article-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.article-not-found {
  text-align: center;
  padding: 80px 0;
}

.article-not-found h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.article-not-found p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* 相关文章 */
.related-section {
  background: var(--color-bg-alt);
  padding: 60px 0 80px;
}

.related-section .section-title {
  font-size: 26px;
  text-align: left;
  margin-bottom: 32px;
}

/* ═══════════════════════════════════════════
   页脚
   ═══════════════════════════════════════════ */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo-text {
  color: #fff;
  font-size: 20px;
}

.footer-brand .logo-sub {
  color: rgba(255, 255, 255, 0.5);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  padding: 4px 0;
  transition: color var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
}

.footer-bottom-left {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-beian {
  color: rgba(255, 255, 255, 0.35);
  transition: color var(--transition);
}

.footer-beian:hover {
  color: rgba(255, 255, 255, 0.65);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.6);
}

/* ═══════════════════════════════════════════
   响应式 - 平板
   ═══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 40px;
  }

  .articles-grid,
  .articles-grid--featured {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    padding: 32px;
  }

  .stat-item:nth-child(2)::after {
    display: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* ═══════════════════════════════════════════
   响应式 - 手机
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 26px;
  }

  .container {
    padding: 0 16px;
  }

  /* 导航 */
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-primary);
    flex-direction: column;
    align-items: flex-start;
    padding: calc(var(--header-height) + 24px) 32px 32px;
    gap: 0;
    transition: right var(--transition);
    box-shadow: var(--shadow-lg);
  }

  .main-nav.open {
    right: 0;
  }

  .main-nav a {
    color: rgba(255, 255, 255, 0.85) !important;
    font-size: 16px;
    padding: 14px 0;
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .main-nav a::after {
    display: none;
  }

  /* Hero */
  .hero {
    min-height: 70vh;
  }

  .hero-title {
    font-size: 30px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    text-align: center;
    justify-content: center;
  }

  /* 统计 */
  .stats-bar {
    margin-top: -24px;
    padding: 24px 0;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  .stat-item::after {
    display: none !important;
  }

  .stat-number {
    font-size: 28px;
  }

  /* 文章 */
  .articles-grid,
  .articles-grid--featured {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .filter-bar {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .filter-btn {
    white-space: nowrap;
    flex-shrink: 0;
  }

  /* 关于 */
  .about-features {
    grid-template-columns: 1fr;
  }

  .about-quote {
    font-size: 18px;
  }

  /* 订阅 */
  .subscribe-box {
    padding: 32px 20px;
  }

  .subscribe-form {
    flex-direction: column;
  }

  /* 详情页 */
  .article-title {
    font-size: 26px;
  }

  #article-cover {
    aspect-ratio: 16 / 10;
    border-radius: 0;
  }

  .article-body h2 {
    font-size: 20px;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .footer-bottom-left {
    flex-direction: column;
    gap: 8px;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }
}

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

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.article-card {
  animation: fadeInUp 0.5s ease-out both;
}

.article-card:nth-child(2) { animation-delay: 0.1s; }
.article-card:nth-child(3) { animation-delay: 0.2s; }
.article-card:nth-child(4) { animation-delay: 0.15s; }
.article-card:nth-child(5) { animation-delay: 0.25s; }
.article-card:nth-child(6) { animation-delay: 0.35s; }

/* 无障碍 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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