/* ===== CSS 变量定义 ===== */
:root {
  /* 颜色系统 */
  --cinnabar-red: #C92A2A;
  --cosmic-blue: #0F172A;
  --dune-gold: #D4AF37;
  --rice-paper: #FAFAF9;
  --ink-gray: #1C1917;
  --stone-gray: #57534E;
  --white: #FFFFFF;
  --interactive-blue: #2563EB;
  --success-green: #10B981;
  
  /* 字体系统 */
  --font-serif: 'Noto Serif SC', 'Playfair Display', serif;
  --font-sans: 'Noto Sans SC', 'Inter', sans-serif;
  
  /* 间距系统 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-xxl: 80px;
  --space-giant: 120px;
  
  /* 阴影系统 */
  --shadow-card: 0 4px 20px rgba(201, 42, 42, 0.08);
  --shadow-card-hover: 0 12px 40px rgba(201, 42, 42, 0.15);
  --shadow-vr-glow: 0 0 30px rgba(37, 99, 235, 0.3);
  
  /* 过渡动画 */
  --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 全局重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--ink-gray);
  background-color: var(--rice-paper);
  overflow-x: hidden;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all 0.3s var(--transition-smooth);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(250, 250, 249, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--dune-gold);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--ink-gray);
  letter-spacing: 0.05em;
}

.logo-seal {
  width: 32px;
  height: 32px;
  background: var(--cinnabar-red);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  border: 2px solid var(--dune-gold);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-link {
  text-decoration: none;
  color: var(--ink-gray);
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
  transition: all 0.3s var(--transition-smooth);
}

.nav-link:hover {
  color: var(--cinnabar-red);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cinnabar-red);
  transition: width 0.3s var(--transition-smooth);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background: var(--cinnabar-red);
  transition: all 0.3s var(--transition-smooth);
}

/* ===== 英雄区域 ===== */
.hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--cosmic-blue) 0%, #1e293b 50%, var(--cinnabar-red) 100%);
}

.particle-system {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.3;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.4);
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 800px;
  padding: 0 var(--space-lg);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 900;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 24px);
  margin-bottom: var(--space-lg);
  color: var(--dune-gold);
  font-weight: 500;
}

.hero-description {
  margin-bottom: var(--space-xl);
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 按钮系统 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: 4px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--cinnabar-red);
  color: white;
  box-shadow: var(--shadow-card);
}

.btn-primary:hover {
  background: #a71e1e;
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--dune-gold);
  border: 1px solid var(--dune-gold);
}

.btn-secondary:hover {
  background: var(--dune-gold);
  color: var(--cosmic-blue);
}

/* ===== 滚动指示器 ===== */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--dune-gold);
  border-bottom: 2px solid var(--dune-gold);
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ===== 通用容器 ===== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== 章节标题 ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xxl);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  color: var(--ink-gray);
  margin-bottom: var(--space-md);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--cinnabar-red);
}

.section-subtitle {
  font-size: 18px;
  color: var(--stone-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== VR体验区域 ===== */
.vr-experience {
  padding: var(--space-giant) 0;
  background: var(--cosmic-blue);
  color: white;
}

.vr-experience .section-title,
.vr-experience .section-subtitle {
  color: white;
}

.vr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.vr-card {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s var(--transition-smooth);
  position: relative;
}

.vr-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-vr-glow);
  border-color: var(--interactive-blue);
}

.vr-card-image {
  position: relative;
  height: 300px;
  overflow: hidden;
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  color: var(--dune-gold);
}

.vr-badge {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: var(--interactive-blue);
  color: white;
  padding: 4px var(--space-sm);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.vr-card-content {
  padding: var(--space-xl);
}

.vr-card-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-md);
}

.vr-card-description {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.vr-tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.tag {
  background: rgba(212, 175, 55, 0.2);
  color: var(--dune-gold);
  padding: 4px var(--space-sm);
  border-radius: 20px;
  font-size: 12px;
  border: 1px solid var(--dune-gold);
}

/* ===== VR进入按钮样式 ===== */
.vr-enter-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.3s var(--transition-smooth);
}

.vr-card:hover .vr-enter-overlay {
  opacity: 1;
}

.vr-enter-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(45deg, var(--cinnabar-red), #a71e1e);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(201, 42, 42, 0.3);
  transform: scale(0.9);
}

.vr-enter-btn:hover {
  transform: scale(1);
  box-shadow: 0 8px 25px rgba(201, 42, 42, 0.4);
  background: linear-gradient(45deg, #a71e1e, #8b1616);
}

.vr-enter-btn:active {
  transform: scale(0.95);
}

.vr-enter-btn svg {
  flex-shrink: 0;
}

/* ===== 文创产品区域 ===== */
.cultural-products {
  padding: var(--space-giant) 0;
  background: var(--rice-paper);
  position: relative;
}

.cultural-products::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23C92A2A' fill-opacity='0.02'%3E%3Cpath d='M30 30c0-11.046-8.954-20-20-20s-20 8.954-20 20 8.954 20 20 20 20-8.954 20-20z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.product-card {
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all 0.3s var(--transition-smooth);
}

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

.product-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.product-image .image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  color: var(--stone-gray);
}

.product-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.paper-cut-badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: var(--cinnabar-red);
  color: white;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(201, 42, 42, 0.3);
}

.product-info {
  padding: var(--space-xl);
}

.product-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-gray);
  margin-bottom: var(--space-sm);
}

.product-description {
  color: var(--stone-gray);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.product-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--cinnabar-red);
}

/* ===== 酒泉文化特色 ===== */
.jiuguan-culture {
  padding: var(--space-giant) 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(to bottom, var(--cosmic-blue), #1e293b);
  color: white;
}

.parallax-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
}

.mountain-silhouette {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, rgba(212, 175, 55, 0.1), transparent);
  clip-path: polygon(0 100%, 20% 80%, 40% 90%, 60% 70%, 80% 85%, 100% 75%, 100% 100%);
}

.culture-elements {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.floating-paper-cut {
  position: absolute;
  width: 40px;
  height: 40px;
  background: var(--dune-gold);
  opacity: 0.1;
  animation: float 6s ease-in-out infinite;
}

.floating-paper-cut:nth-child(1) {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.floating-paper-cut:nth-child(2) {
  top: 60%;
  right: 15%;
  animation-delay: 2s;
}

.floating-paper-cut:nth-child(3) {
  bottom: 30%;
  left: 70%;
  animation-delay: 4s;
}

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

.culture-content {
  position: relative;
  z-index: 10;
}

.culture-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xxl);
  align-items: center;
  margin-bottom: var(--space-xxl);
}

.culture-item:nth-child(even) {
  direction: rtl;
}

.culture-item:nth-child(even) > * {
  direction: ltr;
}

.culture-text {
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  backdrop-filter: blur(10px);
}

.culture-title {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--dune-gold);
  margin-bottom: var(--space-md);
}

.culture-description {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
}

.culture-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(201, 42, 42, 0.05) 0%, rgba(212, 175, 55, 0.05) 100%);
  border-radius: 12px;
  min-height: 120px;
  border: 2px solid rgba(212, 175, 55, 0.2);
}

.visual-placeholder {
  width: 200px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(212, 175, 55, 0.1);
  border: 2px solid var(--dune-gold);
  border-radius: 12px;
  color: var(--dune-gold);
}

/* ===== 技术创新 ===== */
.technology {
  padding: var(--space-giant) 0;
  background: var(--white);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.tech-card {
  text-align: center;
  padding: var(--space-xxl);
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  transition: all 0.3s var(--transition-smooth);
  background: var(--white);
}

.tech-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--cinnabar-red);
}

.tech-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--cinnabar-red), #a71e1e);
  border-radius: 50%;
  color: white;
}

.tech-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--ink-gray);
  margin-bottom: var(--space-md);
}

.tech-description {
  color: var(--stone-gray);
  line-height: 1.7;
}

/* ===== 联系我们 ===== */
.contact {
  padding: var(--space-giant) 0;
  background: linear-gradient(135deg, var(--cosmic-blue), #1e293b);
  color: white;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xxl);
  align-items: start;
}

.contact-title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--dune-gold);
  margin-bottom: var(--space-lg);
}

.contact-description {
  font-size: 18px;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  color: rgba(255, 255, 255, 0.9);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 16px;
}

.contact-item svg {
  color: var(--dune-gold);
  flex-shrink: 0;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--ink-gray);
  color: white;
  padding: var(--space-xxl) 0;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  gap: var(--space-xl);
  align-items: center;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-logo .logo-text {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--dune-gold);
}

.logo-subtitle {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.3s var(--transition-smooth);
}

.footer-links a:hover {
  color: var(--dune-gold);
}

.footer-copyright {
  text-align: right;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-copyright p {
  margin-bottom: var(--space-xs);
}

/* ===== 动画效果 ===== */
[data-aos] {
  opacity: 0;
  transition: all 0.6s var(--transition-smooth);
}

[data-aos].aos-animate {
  opacity: 1;
}

[data-aos="fade-up"] {
  transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
  transform: translateY(0);
}

[data-aos="fade-right"] {
  transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
  transform: translateX(0);
}

[data-aos="fade-left"] {
  transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
  transform: translateX(0);
}

[data-aos="zoom-in"] {
  transform: scale(0.8);
}

[data-aos="zoom-in"].aos-animate {
  transform: scale(1);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .culture-item {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .culture-item:nth-child(even) {
    direction: ltr;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    text-align: center;
  }
  
  .footer-copyright {
    text-align: center;
  }
}

@media (max-width: 768px) {
  :root {
    --space-giant: 80px;
    --space-xxl: 60px;
  }
  
  .nav-menu {
    display: none;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero-title {
    font-size: 40px;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .vr-grid {
    grid-template-columns: 1fr;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .tech-grid {
    grid-template-columns: 1fr;
  }
  
  .culture-title {
    font-size: 24px;
  }
  
  .contact-title {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .nav-container {
    padding: 0 var(--space-md);
  }
  
  .hero-content {
    padding: 0 var(--space-md);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--cinnabar-red);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #a71e1e;
}

/* ===== 选中文本样式 ===== */
::selection {
  background: var(--cinnabar-red);
  color: white;
}

::-moz-selection {
  background: var(--cinnabar-red);
  color: white;
}