/* ===== 全局重置 & CSS变量 ===== */
:root {
  --primary: #e94560;
  --primary-dark: #c73a52;
  --secondary: #0f3460;
  --accent: #16213e;
  --bg-light: #f8f9fa;
  --bg-dark: #1a1a2e;
  --text-light: #f0f0f0;
  --text-dark: #1a1a2e;
  --glass-bg: rgba(255, 255, 255, 0.12);
  --glass-border: rgba(255, 255, 255, 0.2);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --radius: 20px;
  --radius-sm: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.6;
  transition: background 0.4s, color 0.4s;
}

body.dark {
  background: var(--bg-dark);
  color: var(--text-light);
}

a {
  text-decoration: none;
  color: inherit;
}

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

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header & Nav ===== */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: background 0.4s, border-color 0.4s;
}

body.dark header {
  background: rgba(26, 26, 46, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  padding: 0 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}

.logo svg {
  width: 40px;
  height: 40px;
}

.nav-links {
  display: flex;
  gap: 28px;
  font-weight: 500;
}

.nav-links a {
  position: relative;
  padding: 6px 0;
  transition: var(--transition);
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  transition: var(--transition);
  color: inherit;
}

.theme-toggle:hover {
  background: var(--glass-bg);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: inherit;
}

/* ===== Hero Banner ===== */
.hero {
  margin-top: 70px;
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--accent), var(--secondary), var(--bg-dark));
  color: white;
}

.hero-slider {
  position: absolute;
  inset: 0;
  display: flex;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-slide {
  min-width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.hero-content {
  max-width: 700px;
  text-align: center;
  z-index: 2;
}

.hero-content h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff, #e94560);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 30px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.btn-primary {
  display: inline-block;
  padding: 14px 40px;
  background: var(--primary);
  color: white;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1.05rem;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(233, 69, 96, 0.35);
}

.hero-controls {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 5;
}

.hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.hero-dot.active {
  background: white;
  transform: scale(1.3);
}

/* ===== Section common ===== */
section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.section-sub {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 50px;
  opacity: 0.8;
  font-size: 1.05rem;
}

/* ===== Grid 2 ===== */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

/* ===== Card Glass ===== */
.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card-glass:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

body.dark .card-glass {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}

/* ===== Team ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 30px;
}

.team-card {
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

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

.team-card .avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), #ff6b6b);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  font-weight: 700;
}

.team-card h4 {
  margin-bottom: 4px;
}

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

/* ===== Products ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 30px;
}

.product-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

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

.product-card .product-img {
  height: 200px;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.3);
}

.product-card .product-info {
  padding: 20px;
}

.product-card .product-info h3 {
  margin-bottom: 8px;
}

.product-card .product-info p {
  font-size: 0.95rem;
  opacity: 0.75;
}

/* ===== Stats ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item h2 {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--primary);
}

.stat-item p {
  opacity: 0.7;
  font-weight: 500;
}

/* ===== Logo Grid ===== */
.logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 24px;
  align-items: center;
}

.logo-item {
  height: 80px;
  background: var(--glass-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.1rem;
  opacity: 0.7;
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

.logo-item:hover {
  opacity: 1;
  background: rgba(233, 69, 96, 0.08);
}

/* ===== Testimonials ===== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.testimonial-card {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

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

.testimonial-card .stars {
  color: #f59e0b;
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.testimonial-card p {
  font-style: italic;
  opacity: 0.85;
  margin-bottom: 16px;
}

.testimonial-card .author {
  font-weight: 700;
}

/* ===== News ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.news-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

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

.news-card .news-img {
  height: 180px;
  background: linear-gradient(135deg, var(--accent), #2a2a5a);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.2);
  font-size: 2rem;
}

.news-card .news-body {
  padding: 20px;
}

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

.news-card .news-body h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.news-card .news-body p {
  font-size: 0.95rem;
  opacity: 0.75;
}

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

.faq-item {
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question:hover {
  background: rgba(233, 69, 96, 0.06);
}

.faq-question .icon {
  transition: var(--transition);
  font-size: 1.2rem;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 18px;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}

/* ===== Footer ===== */
footer {
  background: var(--accent);
  color: var(--text-light);
  padding: 60px 0 30px;
}

body.dark footer {
  background: #0d0d1a;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.footer-grid h4 {
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.footer-grid a {
  display: block;
  opacity: 0.7;
  margin-bottom: 8px;
  transition: var(--transition);
}

.footer-grid a:hover {
  opacity: 1;
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.9rem;
  opacity: 0.7;
}

/* ===== Back to Top ===== */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(233, 69, 96, 0.3);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  z-index: 999;
}

#backToTop.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#backToTop:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

/* ===== Search Modal ===== */
.search-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
}

.search-modal.open {
  display: flex;
}

.search-box {
  background: white;
  border-radius: var(--radius);
  padding: 30px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

body.dark .search-box {
  background: #1e1e3a;
}

.search-box input {
  width: 100%;
  padding: 14px 20px;
  border: 2px solid #ddd;
  border-radius: 50px;
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

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

.search-results {
  margin-top: 16px;
  max-height: 300px;
  overflow-y: auto;
}

.search-results .result-item {
  padding: 10px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  cursor: pointer;
}

.search-results .result-item:hover {
  color: var(--primary);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.9rem;
  opacity: 0.7;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb span {
  color: var(--primary);
}

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

/* ===== Scroll Animation ===== */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    padding: 20px 24px;
    gap: 16px;
    transform: translateY(-120%);
    transition: var(--transition);
    box-shadow: var(--shadow);
    z-index: 999;
  }

  body.dark .nav-links {
    background: rgba(26, 26, 46, 0.98);
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .mobile-menu-btn {
    display: block;
  }

  .grid-2 {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

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

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  section {
    padding: 50px 0;
  }
}