:/* ===== 影站 yingzu.net.cn 全站样式 ===== */
/* 主题变量 */
:root {
  --bg-primary: #f0f4f8;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-solid: #ffffff;
  --bg-footer: #0f1a24;
  --text-primary: #1a2634;
  --text-secondary: #3d4f5f;
  --text-heading: #0b1a2a;
  --text-link: #0066cc;
  --text-on-dark: #f0f8ff;
  --text-footer: #b8c7d9;
  --brand-color: #1e6f9f;
  --brand-light: #4a9fd4;
  --brand-dark: #0d3b5c;
  --border-light: rgba(0, 0, 0, 0.08);
  --nav-bg: rgba(255, 255, 255, 0.8);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.15);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.4);
  --gradient-primary: linear-gradient(135deg, #0d3b5c 0%, #1e6f9f 50%, #4a9fd4 100%);
  --gradient-accent: linear-gradient(135deg, #ff8c42 0%, #ffb347 100%);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0d141e;
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-card-solid: #1e293b;
  --bg-footer: #070d14;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-heading: #f8fafc;
  --text-link: #7ab8e0;
  --text-on-dark: #f8fafc;
  --text-footer: #8fa3b8;
  --brand-color: #4a9fd4;
  --brand-light: #7ab8e0;
  --brand-dark: #1e6f9f;
  --border-light: rgba(255, 255, 255, 0.1);
  --nav-bg: rgba(15, 23, 42, 0.85);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(15, 23, 42, 0.5);
  --glass-border: rgba(255, 255, 255, 0.1);
  --gradient-primary: linear-gradient(135deg, #0b1a2a 0%, #1e293b 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 20%, rgba(30, 111, 159, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255, 179, 71, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul, ol {
  list-style-position: inside;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ===== 导航栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}

.logo {
  flex-shrink: 0;
}

.logo a {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--brand-color), var(--brand-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo svg {
  width: 38px;
  height: 38px;
  filter: drop-shadow(0 2px 8px rgba(30, 111, 159, 0.3));
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  color: var(--text-primary);
  position: relative;
  padding: 6px 2px;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-color);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-light);
  border-radius: 50px;
  overflow: hidden;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.search-box:focus-within {
  border-color: var(--brand-color);
  box-shadow: 0 0 0 3px rgba(30, 111, 159, 0.15);
}

.search-box input {
  border: none;
  padding: 8px 16px;
  background: transparent;
  color: var(--text-primary);
  outline: none;
  width: 200px;
  font-size: 0.9rem;
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-box button {
  background: var(--brand-color);
  border: none;
  padding: 8px 16px;
  cursor: pointer;
  color: white;
  font-weight: 600;
  transition: background 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-box button:hover {
  background: var(--brand-dark);
}

.theme-toggle, .mobile-menu {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.3rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  position: relative;
}

.theme-toggle:hover, .mobile-menu:hover {
  background: var(--bg-card);
  transform: scale(1.1);
}

.theme-toggle {
  font-size: 1.2rem;
}

.mobile-menu {
  display: none;
  font-size: 1.4rem;
}

/* 移动端导航 */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg-card-solid);
  padding: 20px;
  border-top: 1px solid var(--border-light);
  backdrop-filter: blur(20px);
  animation: slideDown 0.3s ease;
}

.mobile-nav.show {
  display: flex;
}

.mobile-nav a {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-light);
  font-weight: 500;
  color: var(--text-primary);
  font-size: 1.05rem;
  transition: padding-left 0.3s;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  padding-left: 12px;
  color: var(--brand-color);
}

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

/* ===== Hero Banner ===== */
.hero {
  background: var(--gradient-primary);
  color: white;
  padding: 80px 0;
  margin-bottom: 50px;
  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(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 179, 71, 0.15) 0%, transparent 70%);
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.05); }
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 40px;
  position: relative;
  z-index: 2;
}

.hero-text {
  flex: 1 1 450px;
  animation: fadeInUp 0.8s ease;
}

.hero-text h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  color: white;
  margin-bottom: 20px;
  line-height: 1.25;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  letter-spacing: -0.02em;
}

.hero-text p {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: rgba(255, 255, 255, 0.9);
  max-width: 650px;
  margin-bottom: 30px;
  line-height: 1.8;
}

.hero-badge {
  background: var(--gradient-accent);
  color: #1a2a3a;
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 700;
  display: inline-block;
  margin-bottom: 20px;
  font-size: 0.9rem;
  box-shadow: 0 4px 15px rgba(255, 179, 71, 0.3);
  animation: pulse 2s ease-in-out infinite;
}

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

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

.btn {
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::after {
  width: 300px;
  height: 300px;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--gradient-accent);
  color: #1a2a3a;
  box-shadow: 0 4px 15px rgba(255, 179, 71, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 179, 71, 0.5);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: white;
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.hero-visual {
  flex: 1 1 300px;
  animation: fadeInRight 0.8s ease 0.2s backwards;
}

.hero-visual svg {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
  animation: levitate 6s ease-in-out infinite;
}

@keyframes levitate {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(2deg); }
}

/* ===== Sections 通用 ===== */
section {
  margin: 60px 0;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 40px;
  position: relative;
  padding-bottom: 15px;
  letter-spacing: -0.5px;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 70px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 4px;
  transition: width 0.4s ease;
}

.section-title:hover::after {
  width: 120px;
}

/* ===== 卡片 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

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

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.card h3 {
  color: var(--text-heading);
  margin-bottom: 15px;
  font-size: 1.3rem;
  font-weight: 700;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 15px;
}

.card .card-tag {
  color: var(--brand-color);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ===== 关于/品牌区 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.about-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 30px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.about-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.about-card h3 {
  color: var(--text-heading);
  font-size: 1.4rem;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.about-card p {
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.8;
}

.about-card strong {
  color: var(--text-primary);
}

/* ===== 解决方案 ===== */
.solution-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.solution-item {
  flex: 1;
  min-width: 240px;
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.solution-item::after {
  content: '';
  position: absolute;
  bottom: -30px;
  right: -30px;
  width: 80px;
  height: 80px;
  background: var(--brand-color);
  opacity: 0.05;
  border-radius: 50%;
  transition: all 0.4s ease;
}

.solution-item:hover::after {
  transform: scale(3);
}

.solution-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.solution-item h3 {
  color: var(--text-heading);
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.solution-item p {
  color: var(--text-secondary);
}

/* ===== 文章列表 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-item {
  background: var(--bg-card);
  padding: 24px 28px;
  border-radius: var(--radius-md);
  border-left: 5px solid var(--brand-color);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  animation: fadeInUp 0.5s ease backwards;
}

.article-item:nth-child(2) { animation-delay: 0.1s; }
.article-item:nth-child(3) { animation-delay: 0.2s; }
.article-item:nth-child(4) { animation-delay: 0.3s; }
.article-item:nth-child(5) { animation-delay: 0.4s; }
.article-item:nth-child(6) { animation-delay: 0.5s; }
.article-item:nth-child(7) { animation-delay: 0.6s; }
.article-item:nth-child(8) { animation-delay: 0.7s; }
.article-item:nth-child(9) { animation-delay: 0.8s; }
.article-item:nth-child(10) { animation-delay: 0.9s; }

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

.article-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-hover);
  border-left-color: var(--brand-light);
}

.article-item h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.article-item h3 a {
  color: var(--text-heading);
  transition: color 0.2s;
}

.article-item h3 a:hover {
  color: var(--brand-color);
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-item p {
  color: var(--text-secondary);
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-item > a {
  color: var(--brand-color);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.article-item > a:hover {
  text-decoration: underline;
  padding-left: 5px;
}

/* ===== 评价区 ===== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 5rem;
  color: var(--brand-color);
  opacity: 0.1;
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-card:hover {
  transform: translateY(-5px) rotate(0.5deg);
  box-shadow: var(--shadow-hover);
}

.testimonial-card p {
  color: var(--text-primary);
  font-style: italic;
  margin-bottom: 20px;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.testimonial-card span {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
}

/* ===== FAQ ===== */
.faq-list details {
  background: var(--bg-card);
  padding: 24px 28px;
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.faq-list details::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.faq-list details:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-hover);
}

.faq-list details[open] {
  background: var(--bg-card-solid);
}

.faq-list details[open]::before {
  opacity: 1;
}

.faq-list summary {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-heading);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-right: 30px;
  position: relative;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: '+';
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--brand-color);
  transition: transform 0.3s ease;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.faq-list details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-list p {
  margin-top: 15px;
  color: var(--text-secondary);
  padding-top: 15px;
  border-top: 1px solid var(--border-light);
  line-height: 1.8;
}

/* ===== HowTo ===== */
.howto-steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

.howto-steps li {
  counter-increment: step;
  margin-bottom: 18px;
  padding: 16px 20px 16px 60px;
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.howto-steps li:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow);
}

.howto-steps li::before {
  content: counter(step);
  background: var(--gradient-primary);
  color: white;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  box-shadow: 0 4px 12px rgba(30, 111, 159, 0.3);
}

.howto-steps li strong {
  color: var(--text-heading);
  display: block;
  margin-bottom: 4px;
}

.howto-steps + p {
  margin-top: 25px;
  color: var(--text-secondary);
  background: var(--bg-card);
  padding: 18px 24px;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--brand-color);
  font-weight: 500;
}

/* ===== 友情链接 ===== */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.friend-links a {
  background: var(--bg-card);
  padding: 10px 22px;
  border-radius: 50px;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.friend-links a:hover {
  background: var(--brand-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(30, 111, 159, 0.2);
  border-color: var(--brand-color);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 60px 0 20px;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.site-footer h4 {
  color: white;
  margin-bottom: 20px;
  font-size: 1.1rem;
  font-weight: 700;
  position: relative;
  padding-bottom: 10px;
}

.site-footer h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background: var(--brand-light);
}

.site-footer a {
  color: var(--text-footer);
  transition: color 0.2s ease, padding-left 0.2s ease;
  display: inline-block;
  margin-bottom: 8px;
}

.site-footer a:hover {
  color: white;
  padding-left: 5px;
}

.site-footer p {
  margin-bottom: 8px;
  line-height: 1.8;
}

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 25px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-footer);
  line-height: 1.8;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--gradient-primary);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(30, 111, 159, 0.3);
  border: none;
  cursor: pointer;
  z-index: 200;
  font-size: 1.3rem;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

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

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(30, 111, 159, 0.4);
}

/* ===== 动画增强 ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--brand-color);
  border-radius: 10px;
}

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

/* ===== 自定义工具类 ===== */
.text-secondary {
  color: var(--text-secondary);
}

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

.mt-4 {
  margin-top: 24px;
}

.mb-4 {
  margin-bottom: 24px;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }

  .nav-links {
    gap: 20px;
  }

  .search-box input {
    width: 150px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }

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

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

@media (max-width: 900px) {
  .site-header {
    height: auto;
  }

  .nav-links, .search-box {
    display: none;
  }

  .mobile-menu {
    display: flex;
  }

  .mobile-nav.show {
    display: flex;
  }

  .hero {
    padding: 60px 0;
    border-radius: 0 0 40px 40px;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-badge {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-text p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual svg {
    max-width: 280px;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .solution-item {
    min-width: 200px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }

  .logo a {
    font-size: 1.5rem;
  }

  .logo svg {
    width: 32px;
    height: 32px;
  }

  .theme-toggle {
    font-size: 1.1rem;
  }

  .hero {
    padding: 40px 0;
    margin-bottom: 30px;
  }

  .hero-text h1 {
    font-size: 1.6rem;
  }

  .hero-badge {
    font-size: 0.8rem;
    padding: 6px 14px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  section {
    margin: 40px 0;
  }

  .section-title {
    font-size: 1.5rem;
    margin-bottom: 25px;
  }

  .card {
    padding: 20px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .article-item {
    padding: 18px 20px;
  }

  .article-item h3 {
    font-size: 1.1rem;
  }

  .faq-list details {
    padding: 16px 18px;
  }

  .faq-list summary {
    font-size: 1rem;
  }

  .howto-steps li {
    padding: 14px 16px 14px 50px;
  }

  .howto-steps li::before {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }

  .about-card {
    padding: 20px;
  }

  .solution-item {
    min-width: 100%;
  }
}

@media (max-width: 400px) {
  .hero-text h1 {
    font-size: 1.4rem;
  }

  .hero-badge {
    font-size: 0.75rem;
  }

  .btn {
    padding: 10px 20px;
    font-size: 0.85rem;
  }

  .nav-wrap {
    height: 60px;
  }

  .logo a {
    font-size: 1.3rem;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .site-header, .site-footer, .back-to-top, .hero-actions {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card, .article-item, .faq-list details {
    break-inside: avoid;
    box-shadow: none;
    background: white;
  }
}

/* ===== 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;
    scroll-behavior: auto !important;
  }
}

/* ===== 无障碍 ===== */
:focus-visible {
  outline: 3px solid var(--brand-color);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 20px;
  background: var(--brand-color);
  color: white;
  padding: 8px 16px;
  border-radius: 4px;
  z-index: 10000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 10px;
}

/* ===== 暗色模式微调 ===== */
[data-theme="dark"] .card,
[data-theme="dark"] .article-item,
[data-theme="dark"] .faq-list details,
[data-theme="dark"] .about-card,
[data-theme="dark"] .solution-item,
[data-theme="dark"] .testimonial-card {
  background: rgba(30, 41, 59, 0.7);
  border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .search-box {
  background: rgba(30, 41, 59, 0.8);
}

[data-theme="dark"] .back-to-top {
  background: var(--gradient-accent);
  color: #1a2a3a;
}

[data-theme="dark"] .logo a {
  background: linear-gradient(135deg, #7ab8e0, #4a9fd4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 装饰元素 ===== */
.glass-effect {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 电影卡片特殊样式 ===== */
.movie-card {
  position: relative;
  overflow: hidden;
}

.movie-card .movie-thumb {
  width: 100%;
  height: 180px;
  border-radius: var(--radius-sm);
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 1px;
  transition: transform 0.4s ease;
}

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

.movie-card .movie-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.movie-card .movie-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
}

.movie-card .movie-badge {
  position: absolute;
  top: 15px;
  left: 15px;
  background: var(--gradient-accent);
  color: #1a2a3a;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ===== 数据表格 ===== */
.info-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.info-table th {
  background: var(--gradient-primary);
  color: white;
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.info-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  transition: background 0.2s ease;
}

.info-table tr:last-child td {
  border-bottom: none;
}

.info-table tbody tr:hover {
  background: rgba(30, 111, 159, 0.05);
}

/* ===== 统计数字 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin: 40px 0;
}

.stat-item {
  text-align: center;
  padding: 30px 20px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 0.95rem;
  font-weight: 500;
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ===== 图片占位样式 ===== */
.svg-placeholder {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  min-height: 100px;
  position: relative;
  overflow: hidden;
}

.svg-placeholder::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}

/* ===== 加载动画 ===== */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-light);
  border-top-color: var(--brand-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  background: rgba(30, 111, 159, 0.1);
  color: var(--brand-color);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin: 4px;
  transition: all 0.2s ease;
}

.tag:hover {
  background: var(--brand-color);
  color: white;
  transform: scale(1.05);
}

/* ===== 分割线 ===== */
.divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border-light), transparent);
  margin: 30px 0;
  border: none;
}

/* ===== 徽章 ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.badge:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.badge-hot {
  background: linear-gradient(135deg, #ff6b6b, #ff8e53);
  color: white;
  border: none;
}

.badge-new {
  background: linear-gradient(135deg, #4ecdc4, #44bd9e);
  color: white;
  border: none;
}

/* ===== 结束 ===== */