/* ===== 米兰体育官方网站 - style.css ===== */
/* 品牌主色: #e63946 (红), #ffd700 (金), #1a1a2e (深蓝) */

/* ===== CSS 变量 & 主题 ===== */
:root {
  --primary: #e63946;
  --primary-dark: #b71c1c;
  --primary-light: #ff6b6b;
  --secondary: #1a1a2e;
  --accent: #ffd700;
  --accent-light: #ffe44d;
  --bg: #f8f9fa;
  --bg-alt: #ffffff;
  --text: #2d2d2d;
  --text-light: #6c757d;
  --glass: rgba(255, 255, 255, 0.15);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.15);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --transition: 0.3s ease;
  --transition-slow: 0.5s ease;
  --max-width: 1200px;
  --header-height: 64px;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--primary-dark));
  --gradient-accent: linear-gradient(135deg, var(--primary), var(--accent));
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #1a1a2e 100%);
  --gradient-card: linear-gradient(135deg, rgba(230, 57, 70, 0.05), rgba(255, 215, 0, 0.05));
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --bg-alt: #1a1a2e;
  --text: #e0e0e0;
  --text-light: #a0a0a0;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
  --gradient-card: linear-gradient(135deg, rgba(230, 57, 70, 0.1), rgba(255, 215, 0, 0.05));
}

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

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

body {
  font-family: var(--font-family);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

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

a:hover {
  color: var(--primary-dark);
}

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

ul, ol {
  list-style: none;
}

/* ===== 容器 & 布局 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  text-align: center;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  margin: 16px auto 0;
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 48px;
  font-weight: 400;
}

/* ===== 网格系统 ===== */
.grid {
  display: grid;
  gap: 32px;
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: center;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  opacity: 0;
  transition: opacity var(--transition);
  z-index: -1;
  border-radius: 50px;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(230, 57, 70, 0.4);
}

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

.btn:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline::before {
  display: none;
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 25px rgba(230, 57, 70, 0.3);
}

/* ===== 毛玻璃 & 卡片 ===== */
.glass {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  background: var(--glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

/* ===== 滚动动画 ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 头部导航 ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--transition);
  height: var(--header-height);
}

header.scrolled {
  background: rgba(26, 26, 46, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 100%;
}

.logo {
  font-size: 1.6rem;
  font-weight: 900;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo span {
  background: linear-gradient(135deg, #fff, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 24px;
  align-items: center;
}

nav a {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
  text-decoration: none;
}

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

nav a:hover,
nav a.active {
  color: #fff;
}

nav a:hover::after,
nav a.active::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.menu-toggle span {
  width: 28px;
  height: 3px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

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

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

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

/* ===== Hero 区域 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--gradient-hero);
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(230, 57, 70, 0.15) 0%, transparent 60%),
              radial-gradient(circle at 70% 30%, rgba(255, 215, 0, 0.08) 0%, transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(30px, 20px);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 20px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.hero h1 span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero .btn {
  font-size: 1.05rem;
  padding: 14px 36px;
}

/* ===== Banner 轮播 ===== */
.banner-carousel {
  position: relative;
  width: 100%;
  margin: 40px 0;
  overflow: hidden;
  border-radius: var(--radius);
}

.banner-slide {
  display: none;
  padding: 60px 40px;
  text-align: center;
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.2), rgba(255, 215, 0, 0.1));
  min-height: 200px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
}

.banner-slide.active {
  display: flex;
  animation: fadeIn 0.6s ease;
}

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

.banner-slide h3 {
  font-size: 1.8rem;
  color: #fff;
  font-weight: 700;
}

.banner-slide p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  font-size: 1rem;
}

.banner-dots {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
}

.banner-dots button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
}

.banner-dots button.active {
  background: var(--primary);
  transform: scale(1.2);
}

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  margin-bottom: 16px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.stat-item {
  text-align: center;
  padding: 20px 12px;
  background: var(--glass);
  border-radius: 12px;
  backdrop-filter: blur(4px);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-top: 4px;
}

/* ===== 团队 ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  padding: 24px 16px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.team-card svg {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 12px;
  display: block;
}

.team-card h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
  font-weight: 600;
}

.team-card p {
  font-size: 0.9rem;
  opacity: 0.7;
}

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

.product-card {
  padding: 32px 24px;
  text-align: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.product-card svg {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  display: block;
}

.product-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.product-card p {
  font-size: 0.95rem;
  opacity: 0.8;
  margin-bottom: 16px;
  line-height: 1.6;
}

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

.service-card {
  padding: 32px 24px;
  text-align: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.service-card svg {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: block;
}

.service-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  font-weight: 700;
}

/* ===== 解决方案 ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.solution-card {
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.solution-card svg {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.solution-card h4 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  font-weight: 600;
}

.solution-card p {
  font-size: 0.9rem;
  opacity: 0.85;
}

/* ===== 行业 ===== */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.industry-item {
  text-align: center;
  padding: 20px 12px;
  background: var(--glass);
  border-radius: 12px;
  backdrop-filter: blur(4px);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition);
}

.industry-item:hover {
  transform: translateY(-4px);
}

.industry-item svg {
  width: 40px;
  height: 40px;
  margin: 0 auto 8px;
  display: block;
}

.industry-item p {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ===== 客户 ===== */
.client-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  padding: 32px 0;
}

.client-logos svg {
  width: 120px;
  height: 60px;
  opacity: 0.6;
  transition: opacity var(--transition), transform var(--transition);
}

.client-logos svg:hover {
  opacity: 1;
  transform: scale(1.05);
}

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

.case-card {
  padding: 24px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.case-card h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 600;
}

.case-card p {
  font-size: 0.95rem;
  opacity: 0.8;
  margin-bottom: 12px;
  line-height: 1.6;
}

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

.testimonial-card {
  padding: 24px;
  position: relative;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.testimonial-card::before {
  content: '"';
  font-size: 3rem;
  color: var(--primary);
  opacity: 0.3;
  position: absolute;
  top: 8px;
  left: 16px;
  font-family: Georgia, serif;
}

.testimonial-card p {
  font-style: italic;
  margin-bottom: 12px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.testimonial-card h5 {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
}

/* ===== 新闻 ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.news-card {
  padding: 24px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.news-card .date {
  font-size: 0.85rem;
  opacity: 0.6;
  margin-bottom: 8px;
}

.news-card h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 600;
}

.news-card p {
  font-size: 0.95rem;
  opacity: 0.8;
  margin-bottom: 16px;
  line-height: 1.6;
}

/* ===== 相关推荐 ===== */
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.related-card {
  padding: 16px;
  font-size: 0.9rem;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.related-card h5 {
  font-size: 1rem;
  margin-bottom: 6px;
  font-weight: 600;
}

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

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--glass-border);
  padding: 16px 0;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 8px 0;
  background: none;
  border: none;
  color: var(--text);
  width: 100%;
  text-align: left;
  transition: color var(--transition);
}

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

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  transition: transform var(--transition);
  color: var(--primary);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 8px 0 16px;
  display: none;
  font-size: 0.95rem;
  opacity: 0.85;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* ===== 教程 ===== */
.howto-section {
  max-width: 800px;
  margin: 0 auto;
}

.howto-section h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--primary);
}

.howto-section ul {
  padding-left: 20px;
  margin-bottom: 24px;
}

.howto-section ul li {
  list-style: disc;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.howto-step {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  padding: 20px;
  background: var(--glass);
  border-radius: 12px;
  backdrop-filter: blur(4px);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition);
}

.howto-step:hover {
  transform: translateX(4px);
}

.howto-step .step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
  font-size: 1.1rem;
}

.howto-step h4 {
  font-size: 1.1rem;
  margin-bottom: 6px;
  font-weight: 600;
}

.howto-step p {
  font-size: 0.95rem;
  opacity: 0.85;
  line-height: 1.6;
}

/* ===== 联系 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info p {
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.contact-info svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  fill: var(--primary);
}

.contact-info strong {
  color: var(--primary);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  background: var(--glass);
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: var(--font-family);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}

.contact-form .btn {
  width: 100%;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--secondary);
  color: rgba(255, 255, 255, 0.8);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.footer h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 16px;
  font-weight: 700;
}

.footer ul {
  list-style: none;
}

.footer li {
  margin-bottom: 8px;
}

.footer a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: color var(--transition);
  text-decoration: none;
}

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

.footer p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.6);
  margin: 0 8px;
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--primary);
}

.qrcode-grid {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

.qrcode-grid svg {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  background: #fff;
  padding: 6px;
  transition: transform var(--transition);
}

.qrcode-grid svg:hover {
  transform: scale(1.05);
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(230, 57, 70, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 25px rgba(230, 57, 70, 0.5);
}

/* ===== 暗黑模式切换 ===== */
.dark-mode-toggle {
  position: fixed;
  bottom: 90px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--glass);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

.dark-mode-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-hover);
}

/* ===== 搜索模态 ===== */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
}

.search-modal.open {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.search-modal-content {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 90%;
  max-width: 500px;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: var(--shadow-hover);
}

.search-modal input {
  width: 100%;
  padding: 14px;
  border: 2px solid var(--primary);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: transparent;
  color: var(--text);
  margin-bottom: 16px;
  transition: box-shadow var(--transition);
}

.search-modal input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.2);
}

.search-results {
  list-style: none;
}

.search-results li {
  padding: 12px 0;
  border-bottom: 1px solid var(--glass-border);
  cursor: pointer;
  transition: color var(--transition), padding-left var(--transition);
}

.search-results li:hover {
  color: var(--primary);
  padding-left: 8px;
}

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

/* ===== 响应式 - 平板 ===== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

  .hero h1 {
    font-size: 2.8rem;
  }
}

/* ===== 响应式 - 手机 ===== */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero .btn {
    font-size: 0.95rem;
    padding: 12px 28px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

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

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

  .product-grid,
  .service-grid,
  .solution-grid,
  .case-grid,
  .testimonial-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

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

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

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

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

  nav ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(26, 26, 46, 0.98);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  nav ul.open {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .banner-slide {
    padding: 40px 20px;
  }

  .banner-slide h3 {
    font-size: 1.3rem;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .section {
    padding: 48px 0;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .client-logos {
    gap: 16px;
  }

  .client-logos svg {
    width: 80px;
    height: 40px;
  }

  .qrcode-grid {
    flex-direction: column;
    align-items: center;
  }

  .back-to-top,
  .dark-mode-toggle {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
    right: 16px;
  }

  .dark-mode-toggle {
    bottom: 76px;
  }

  .back-to-top {
    bottom: 20px;
  }

  .search-modal-content {
    padding: 24px;
  }
}

/* ===== 响应式 - 小屏手机 ===== */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-btns {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

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

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

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

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

  .section-title {
    font-size: 1.5rem;
  }

  .banner-slide h3 {
    font-size: 1.1rem;
  }

  .banner-slide p {
    font-size: 0.9rem;
  }
}

/* ===== 打印样式 ===== */
@media print {
  header,
  .back-to-top,
  .dark-mode-toggle,
  .search-modal {
    display: none !important;
  }

  .hero {
    min-height: auto;
    padding: 40px 0;
  }

  .section {
    padding: 32px 0;
    page-break-inside: avoid;
  }

  .card,
  .glass {
    background: #fff !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
  }

  body {
    color: #000 !important;
    background: #fff !important;
  }
}