/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #d4a574;
  --color-secondary: #8b7355;
  --color-accent: #c9b79c;
  --color-light: #f5f5f0;
  --color-gray: #6c6c6c;
  --color-dark: #2c2c2c;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-light);
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(245, 245, 240, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

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

.nav-link {
  color: var(--color-gray);
  text-decoration: none;
  font-size: 1rem;
  transition: color 0.3s ease;
  position: relative;
}

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

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
}

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--color-primary);
  margin: 3px 0;
  transition: 0.3s;
}

/* 主容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* 主视觉区 */
.hero {
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 70px;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: white;
  padding: var(--spacing-xl);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
  animation: fadeInUp 1s ease-out 0.2s;
  animation-fill-mode: both;
}

/* 简介区域 */
.intro {
  padding: var(--spacing-xl) 0;
  text-align: center;
  background-color: white;
}

.intro-text {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-gray);
}

/* 精选展示 */
.featured {
  padding: var(--spacing-xl) 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-primary);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.featured-card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.featured-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.featured-image {
  width: 100%;
  height: 350px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.featured-card:hover .featured-image {
  transform: scale(1.05);
}

.featured-content {
  padding: var(--spacing-md);
}

.featured-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.featured-desc {
  color: var(--color-gray);
  font-size: 1rem;
}

/* 材质展示 */
.material-grid {
  display: grid;
  gap: var(--spacing-xl);
}

.material-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

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

.material-item-content {
  direction: ltr;
  padding: var(--spacing-lg);
}

.material-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.material-title {
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.material-desc {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-gray);
}

/* 系法教程 */
.tutorial-grid {
  display: grid;
  gap: var(--spacing-xl);
}

.tutorial-item {
  background: white;
  border-radius: 10px;
  padding: var(--spacing-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.tutorial-title {
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.tutorial-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.step {
  text-align: center;
  padding: var(--spacing-md);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: white;
  border-radius: 50%;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.step-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: var(--spacing-sm);
  transition: transform 0.3s ease;
}

.step:hover .step-image {
  transform: scale(1.05);
}

.step-desc {
  color: var(--color-gray);
  font-size: 1rem;
}

/* 静物赏析 */
.gallery-grid {
  columns: 4 300px;
  column-gap: var(--spacing-md);
}

.gallery-item {
  break-inside: avoid;
  margin-bottom: var(--spacing-md);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.gallery-item:hover {
  transform: translateY(-5px);
}

.gallery-image {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.gallery-item:hover .gallery-image {
  transform: scale(1.05);
}

/* 页脚 */
.footer {
  text-align: center;
  padding: var(--spacing-md) 0;
  background-color: white;
  color: var(--color-gray);
  font-size: 0.875rem;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: white;
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: var(--spacing-lg) 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }

  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .material-item {
    grid-template-columns: 1fr;
  }

  .material-item:nth-child(even) {
    direction: ltr;
  }

  .tutorial-steps {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    columns: 2 200px;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: var(--spacing-sm);
  }

  .container {
    padding: var(--spacing-sm);
  }

  .hero-title {
    font-size: 2rem;
  }

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

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

  .gallery-grid {
    columns: 1;
  }
}