/* ===== 紫晶立方官网样式表 ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

/* --- CSS变量 --- */
:root {
  --primary: #7B2D8E;
  --secondary: #C41E8A;
  --accent: #E91E9C;
  --bg-dark-1: #0d0d1a;
  --bg-dark-2: #1a1a2e;
  --bg-dark-3: #16213e;
  --card-bg: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.08);
  --card-hover: rgba(255,255,255,0.08);
  --text-primary: #ffffff;
  --text-secondary: #b0b0c0;
  --text-muted: #6a6a80;
  --gradient-brand: linear-gradient(135deg, #7B2D8E, #C41E8A, #E91E9C);
  --gradient-bg: linear-gradient(180deg, #0d0d1a 0%, #1a1a2e 50%, #16213e 100%);
  --font-cn: 'Noto Sans SC', sans-serif;
  --font-en: 'Inter', sans-serif;
  --nav-height: 72px;
  --section-padding: 120px 0;
  --max-width: 1200px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-cn);
  background: var(--bg-dark-1);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- 滚动动画 --- */
.fade-in { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-left { opacity: 0; transform: translateX(-60px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-left.visible { opacity: 1; transform: translateX(0); }
.fade-right { opacity: 0; transform: translateX(60px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-right.visible { opacity: 1; transform: translateX(0); }

/* --- 区块标题 --- */
.section-title {
  text-align: center;
  margin-bottom: 64px;
}
.section-title h2 {
  font-size: 2.8rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.section-title p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 32px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(13,13,26,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
}
.nav-logo img { height: 64px; }
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo span {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-brand);
  transition: width 0.3s ease;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.lang-switch {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: var(--transition);
}
.lang-switch:hover { border-color: var(--accent); color: var(--text-primary); }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { width: 24px; height: 2px; background: var(--text-primary); transition: var(--transition); border-radius: 2px; }

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}
.hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(123,45,142,0.15) 0%, transparent 70%);
  top: -100px; right: -100px;
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}
.hero::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(196,30,138,0.1) 0%, transparent 70%);
  bottom: -50px; left: -50px;
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 30px;
  padding: 8px 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  backdrop-filter: blur(10px);
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 2s ease infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero h1 {
  font-size: 4.5rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 8px;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
}
.hero .hero-slogan {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.hero .hero-slogan-en {
  font-size: 1.1rem;
  font-family: var(--font-en);
  font-weight: 400;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.hero .hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 560px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--gradient-brand);
  color: #fff;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(123,45,142,0.4); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--text-primary);
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover { border-color: var(--accent); background: rgba(233,30,156,0.05); }

/* Hero 数据横幅 */
.hero-stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--card-border);
}
.stat-item { text-align: center; }
.stat-item h3 {
  font-size: 1.8rem;
  font-weight: 800;
  font-family: var(--font-en);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}
.stat-item p { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* ===== 关于我们 ===== */
.about { padding: var(--section-padding); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-text h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
.about-text p { color: var(--text-secondary); margin-bottom: 16px; font-size: 1rem; line-height: 1.9; }
.about-text .highlight {
  color: var(--accent);
  font-weight: 600;
}
.about-img {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--card-border);
  position: relative;
}
.about-img img { width: 100%; height: 400px; object-fit: cover; }
.about-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(123,45,142,0.2) 0%, transparent 60%);
  pointer-events: none;
}

/* ===== 核心技术 ===== */
.technology { padding: var(--section-padding); background: var(--bg-dark-2); }
.tech-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tech-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 40px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.tech-card:hover { background: var(--card-hover); border-color: rgba(233,30,156,0.2); transform: translateY(-4px); }
.tech-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.tech-card:hover::before { opacity: 1; }
.tech-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: rgba(123,45,142,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 24px;
}
.tech-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 12px; }
.tech-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }
.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tech-tags span {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(123,45,142,0.1);
  border: 1px solid rgba(123,45,142,0.2);
  color: var(--accent);
}

/* ===== 产品中心 ===== */
.products { padding: var(--section-padding); }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  overflow: hidden;
  transition: var(--transition);
}
.product-card:hover { transform: translateY(-6px); border-color: rgba(233,30,156,0.3); box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.product-card .product-img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.product-card:hover .product-img { transform: scale(1.05); }
.product-img-wrapper { overflow: hidden; }
.product-info { padding: 24px; }
.product-info h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.product-info p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* 场景大图 */
.scene-showcase {
  margin-top: 64px;
  border-radius: 24px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--card-border);
}
.scene-showcase img { width: 100%; height: 400px; object-fit: cover; }
.scene-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13,13,26,0.8) 0%, transparent 60%);
  display: flex;
  align-items: center;
  padding: 48px;
}
.scene-overlay h3 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.scene-overlay p { font-size: 1rem; color: var(--text-secondary); max-width: 400px; }

/* ===== 应用领域 ===== */
.applications { padding: var(--section-padding); background: var(--bg-dark-2); }
.app-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.app-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 40px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  transition: var(--transition);
}
.app-card:hover { background: var(--card-hover); border-color: rgba(233,30,156,0.2); }
.app-icon {
  flex-shrink: 0;
  width: 64px; height: 64px;
  border-radius: 16px;
  background: rgba(123,45,142,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.app-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.app-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== 发展历程 ===== */
.timeline-section { padding: var(--section-padding); }
.timeline { position: relative; max-width: 800px; margin: 0 auto; }
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  opacity: 0.3;
}
.timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 48px;
  position: relative;
}
.timeline-item:nth-child(odd) { flex-direction: row-reverse; text-align: right; }
.timeline-item:nth-child(odd) .tl-content { padding-right: 48px; padding-left: 0; }
.timeline-item:nth-child(even) .tl-content { padding-left: 48px; }
.tl-content { flex: 1; }
.tl-dot {
  position: absolute;
  left: 50%; top: 8px;
  transform: translateX(-50%);
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--gradient-brand);
  border: 3px solid var(--bg-dark-1);
  z-index: 2;
}
.tl-year {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}
.tl-content h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 4px; }
.tl-content p { font-size: 0.9rem; color: var(--text-secondary); }

/* 荣誉标签 */
.honors { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 64px; }
.honor-tag {
  padding: 10px 20px;
  border-radius: 30px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.honor-tag:hover { border-color: var(--accent); color: var(--accent); }

/* ===== 联系我们 ===== */
.contact { padding: var(--section-padding); background: var(--bg-dark-2); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.contact-info h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 24px; }
.contact-item { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
.contact-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(123,45,142,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-item p { color: var(--text-secondary); font-size: 0.95rem; }
.contact-item a { color: var(--text-secondary); transition: var(--transition); }
.contact-item a:hover { color: var(--accent); }

.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-row { display: flex; gap: 16px; }
.form-group { flex: 1; }
.form-group input, .form-group textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: var(--font-cn);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-group textarea { resize: vertical; min-height: 140px; }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }

.form-submit {
  align-self: flex-start;
  padding: 14px 40px;
  background: var(--gradient-brand);
  border: none;
  border-radius: 12px;
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-cn);
}
.form-submit:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(123,45,142,0.4); }

/* ===== Footer ===== */
.footer {
  padding: 48px 0 24px;
  border-top: 1px solid var(--card-border);
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-logo { display: flex; align-items: center; gap: 10px; }
.footer-logo img { height: 48px; }
.footer-logo span { font-weight: 700; font-size: 1rem; background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 0.85rem; color: var(--text-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--text-primary); }
.footer-copy { width: 100%; text-align: center; margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--card-border); font-size: 0.8rem; color: var(--text-muted); }

/* ===== 移动端菜单 ===== */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13,13,26,0.95);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}
.mobile-menu a:hover { color: var(--text-primary); }
.mobile-close {
  position: absolute;
  top: 24px; right: 24px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.8rem;
  cursor: pointer;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero h1 { font-size: 3.2rem; }
  .hero .hero-slogan { font-size: 1.6rem; }
  .tech-cards { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .about-img { order: -1; }
  .timeline-item, .timeline-item:nth-child(odd) { flex-direction: column; text-align: left; }
  .timeline::before { left: 16px; }
  .tl-dot { left: 16px; }
  .timeline-item:nth-child(odd) .tl-content, .timeline-item:nth-child(even) .tl-content { padding-left: 48px; padding-right: 0; }
}

@media (max-width: 768px) {
  :root { --section-padding: 80px 0; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero h1 { font-size: 2.5rem; }
  .hero .hero-slogan { font-size: 1.3rem; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .section-title h2 { font-size: 2rem; }
  .product-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
  .scene-showcase img { height: 260px; }
  .scene-overlay { padding: 24px; }
  .scene-overlay h3 { font-size: 1.4rem; }
  .footer-content { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .hero-btns { flex-direction: column; }
  .hero-btns a, .hero-btns button { width: 100%; justify-content: center; }
  .stat-item h3 { font-size: 1.4rem; }
}