```css
/* ===== 策驰影院 · 全站样式表 ===== */
/* 版本：1.0 | 日期：2025 | 设计：高级UI规范 */

/* ---------- 全局重置与设计令牌 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 明亮主题 */
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.85);
  --surface-solid: #ffffff;
  --surface-2: #e9eff5;
  --primary: #1a3b4f;
  --primary-dark: #102632;
  --accent: #2c6e8f;
  --accent-hover: #1d4d68;
  --text-strong: #17202a;
  --text-body: #1f2937;
  --text-title: #0b1a24;
  --text-soft: #334155;
  --text-footer: #d4e0e8;
  --border: rgba(184, 201, 214, 0.6);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.3);
  --radius: 16px;
  --radius-lg: 24px;
  --max-width: 1280px;
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --blur: blur(20px);
}

/* 暗黑主题 */
html[data-theme="dark"] {
  --bg: #0f1720;
  --surface: rgba(30, 41, 59, 0.85);
  --surface-solid: #1e2937;
  --surface-2: #2d3a49;
  --primary: #1e293b;
  --primary-dark: #0f172a;
  --accent: #3a8bb0;
  --accent-hover: #5aa3c5;
  --text-strong: #f1f5f9;
  --text-body: #e2e8f0;
  --text-title: #ffffff;
  --text-soft: #cbd5e1;
  --text-footer: #cbd5e1;
  --border: rgba(58, 75, 94, 0.7);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.7);
  --glass-bg: rgba(30, 41, 59, 0.5);
  --glass-border: rgba(255, 255, 255, 0.08);
}

/* ---------- 基础元素 ---------- */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg);
  color: var(--text-body);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  line-height: 1.7;
  font-size: 1rem;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), #4ec5c1, var(--accent));
  z-index: 9999;
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

h1, h2, h3, h4, h5 {
  color: var(--text-title);
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.4rem); border-left: 6px solid var(--accent); padding-left: 1rem; margin: 3rem 0 2rem; position: relative; }
h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 1rem;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}
h3 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); margin: 2rem 0 1rem; color: var(--text-strong); }
h4 { font-size: 1.15rem; color: var(--text-strong); }

p {
  color: var(--text-body);
  margin-bottom: 1.2rem;
  line-height: 1.8;
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: none;
}

a:not(.btn):not(.logo)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

a:not(.btn):not(.logo):hover::after {
  width: 100%;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

li {
  color: var(--text-body);
  margin-bottom: 0.5rem;
  line-height: 1.8;
}

::selection {
  background: var(--accent);
  color: white;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-hover);
}

/* ---------- 布局容器 ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ---------- 导航栏 ---------- */
.navbar {
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.nav-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  position: relative;
}

.logo {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-title);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.03);
}

.logo svg {
  height: 36px;
  width: 36px;
  filter: drop-shadow(0 2px 8px rgba(44, 110, 143, 0.3));
  transition: transform 0.3s ease;
}

.logo:hover svg {
  transform: rotate(-5deg) scale(1.1);
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-strong);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0;
  position: relative;
  transition: color 0.3s ease;
}

.nav-links a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

.nav-links a:hover::before {
  transform: scaleX(1);
  transform-origin: left;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.dark-toggle {
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 30px;
  padding: 0.4rem 1rem;
  color: var(--text-strong);
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.dark-toggle:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(44, 110, 143, 0.3);
}

.mobile-menu {
  display: none;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 1.5rem;
  color: var(--text-title);
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  transition: var(--transition);
}

.mobile-menu:hover {
  background: var(--accent);
  color: white;
}

/* ---------- 主视觉 Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, #1a4a5f 100%);
  color: white;
  padding: 5rem 0 6rem;
  border-radius: 0 0 60px 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(44, 110, 143, 0.3) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(78, 197, 193, 0.2) 0%, transparent 70%);
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 4rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 1 1 350px;
}

.hero h1 {
  color: white;
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  margin-bottom: 1.5rem;
  line-height: 1.2;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  background: linear-gradient(120deg, #ffffff 0%, #e0f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.15rem;
  line-height: 1.8;
  max-width: 500px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero svg {
  flex: 1 1 300px;
  max-width: 400px;
  animation: pulse 3s ease-in-out infinite;
  filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.03); }
}

/* ---------- 按钮 ---------- */
.btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  border: none;
  color: white;
  padding: 0.9rem 2.5rem;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  display: inline-block;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(44, 110, 143, 0.3);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(44, 110, 143, 0.4);
}

.btn:hover::before {
  left: 100%;
}

.btn:active {
  transform: translateY(-1px);
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.card {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 1rem;
  font-size: 1.3rem;
}

.card p {
  color: var(--text-soft);
  line-height: 1.7;
}

.card svg {
  border-radius: 12px;
  margin-bottom: 1rem;
  transition: var(--transition);
}

.card:hover svg {
  transform: scale(1.05);
}

/* ---------- 毛玻璃卡片 ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

/* ---------- FAQ 手风琴 ---------- */
.faq-item {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.faq-question {
  background: transparent;
  border: none;
  padding: 1.3rem 1.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-strong);
  cursor: pointer;
  text-align: left;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  gap: 1rem;
}

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

.faq-question span {
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform 0.3s ease;
  color: var(--accent);
  flex-shrink: 0;
}

.faq-item.active .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  color: var(--text-body);
  line-height: 1.8;
  display: none;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 文章卡片 ---------- */
.article-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.8rem;
}

.article-card {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #4ec5c1, var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.article-card:hover::after {
  transform: scaleX(1);
}

.article-card h4 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
  transition: color 0.3s ease;
}

.article-card:hover h4 {
  color: var(--accent);
}

.article-card p {
  color: var(--text-soft);
  font-size: 0.95rem;
  margin-bottom: 0.8rem;
}

.article-card a {
  font-weight: 600;
  font-size: 0.95rem;
}

/* ---------- 表格 ---------- */
.info-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--surface-solid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.info-table:hover {
  box-shadow: var(--shadow-lg);
}

.info-table th {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

.info-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-body);
  transition: background 0.3s ease;
}

.info-table tr:hover td {
  background: var(--surface-2);
}

/* ---------- 页脚 ---------- */
.footer {
  background: linear-gradient(135deg, #15232e 0%, #0f1a24 100%);
  color: var(--text-footer);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

html[data-theme="dark"] .footer {
  background: linear-gradient(135deg, #0f172a 0%, #0a0f1a 100%);
}

.footer a {
  color: #b8d9ee;
  transition: color 0.3s ease;
}

.footer a:hover {
  color: white;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 1.2rem;
  position: relative;
  padding-bottom: 0.8rem;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 2rem;
  padding-top: 2rem;
  font-size: 0.9rem;
  text-align: center;
}

/* ---------- 返回顶部 ---------- */
#backToTop {
  position: fixed;
  bottom: 2.5rem;
  right: 2.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  border: none;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  box-shadow: 0 8px 25px rgba(44, 110, 143, 0.4);
  transition: var(--transition);
  z-index: 999;
  backdrop-filter: var(--blur);
}

#backToTop:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: 0 12px 35px rgba(44, 110, 143, 0.5);
}

#backToTop.show {
  display: block;
  animation: fadeInUp 0.4s ease;
}

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

/* ---------- 滚动动画 ---------- */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
  .container {
    padding: 0 1.5rem;
  }
  
  .hero {
    padding: 4rem 0 5rem;
  }
  
  .hero-content {
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    background: var(--surface-solid);
    backdrop-filter: var(--blur);
    padding: 1.5rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    box-shadow: var(--shadow-lg);
    gap: 0.5rem;
    border-top: 1px solid var(--border);
    animation: slideDown 0.3s ease;
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .nav-links a {
    padding: 0.8rem 1rem;
    border-radius: 8px;
    transition: background 0.3s ease, color 0.3s ease;
  }
  
  .nav-links a:hover {
    background: var(--surface-2);
    color: var(--accent);
  }
  
  .nav-links a::before {
    display: none;
  }
  
  .mobile-menu {
    display: block;
  }
  
  .nav-actions {
    gap: 0.5rem;
  }
  
  .dark-toggle {
    padding: 0.4rem 0.8rem;
  }
  
  .hero {
    border-radius: 0 0 40px 40px;
    padding: 3rem 0 4rem;
  }
  
  .hero-content {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-text {
    flex: 1 1 auto;
  }
  
  .hero p {
    margin: 0 auto;
  }
  
  .hero svg {
    max-width: 280px;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .article-cards {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  h2 {
    font-size: 1.6rem;
  }
  
  #backToTop {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .logo {
    font-size: 1.3rem;
  }
  
  .logo svg {
    height: 28px;
    width: 28px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .faq-question {
    font-size: 1rem;
    padding: 1rem 1.2rem;
  }
  
  .faq-answer {
    padding: 0 1.2rem 1.2rem;
  }
  
  .btn {
    padding: 0.8rem 2rem;
    font-size: 0.95rem;
  }
}

/* ---------- 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .navbar, .footer, .btn, #backToTop, .dark-toggle, .mobile-menu {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .hero {
    background: white;
    color: black;
    border-radius: 0;
    padding: 2rem 0;
  }
  
  .hero h1 {
    color: black;
    -webkit-text-fill-color: black;
  }
  
  .card, .article-card, .faq-item {
    break-inside: avoid;
    border: 1px solid #ddd;
    box-shadow: none;
  }
}

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }
.hidden { display: none; }

/* ---------- 品牌色渐变文字 ---------- */
.gradient-text {
  background: linear-gradient(135deg, var(--accent), #4ec5c1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- 分隔线 ---------- */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 3rem 0;
}

/* ---------- 徽章 ---------- */
.badge {
  display: inline-block;
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  background: linear-gradient(135deg, rgba(44, 110, 143, 0.1), rgba(78, 197, 193, 0.1));
  color: var(--accent);
  border: 1px solid rgba(44, 110, 143, 0.2);
}

/* ---------- 响应式容器 ---------- */
.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ---------- 图片响应式 ---------- */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* ---------- 焦点可见性 ---------- */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 移动端菜单展开状态 ---------- */
.mobile-menu-open .nav-links {
  display: flex;
  flex-direction: column;
  background: var(--surface-solid);
  backdrop-filter: var(--blur);
  padding: 1rem;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  box-shadow: var(--shadow-lg);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  border-top: 1px solid var(--border);
  animation: slideDown 0.3s ease;
}

.mobile-menu-open .nav-links a {
  padding: 0.8rem 1rem;
  text-align: center;
  border-radius: 8px;
}

.mobile-menu-open .nav-links a:hover {
  background: var(--surface-2);
}
```