/* ========== 背景动态效果 ========== */

.hero-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
  background: #F9F8F4;
  transition: background 0.3s ease;
}

.hero-background::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 20% 50%, rgba(197, 160, 89, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(197, 160, 89, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(197, 160, 89, 0.08) 0%, transparent 50%),
    linear-gradient(135deg, #F9F8F4 0%, #F5F3EC 50%, #F9F8F4 100%);
  animation: gradient-shift 15s ease-in-out infinite;
  transition: opacity 0.3s ease;
}

/* 暗色模式适配 */
[data-md-color-scheme="slate"] .hero-background {
  background: #1E1E1E;
}

[data-md-color-scheme="slate"] .hero-background::before {
  background:
    radial-gradient(circle at 20% 50%, rgba(212, 175, 122, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(212, 175, 122, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(212, 175, 122, 0.06) 0%, transparent 50%),
    linear-gradient(135deg, #1E1E1E 0%, #141414 50%, #1E1E1E 100%);
}

@keyframes gradient-shift {
  0%, 100% {
    transform: translate(0, 0) rotate(0deg);
  }
  33% {
    transform: translate(5%, 5%) rotate(5deg);
  }
  66% {
    transform: translate(-5%, -5%) rotate(-5deg);
  }
}

/* Canvas 粒子画布 */
#particles-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ========== Hero Section - 论文风格 ========== */

.hero {
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Display",
    "SF Pro Text",
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 2rem;
}

/* Hero 内容容器 - 极简透明 */
.hero-content {
  /* 入场动画 */
  opacity: 0;
  transform: translateY(30px);
  animation: fade-in-up 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  will-change: transform, opacity;

  /* 文字居中 */
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

@keyframes fade-in-up {
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

/* ========== 论文风格排版 ========== */

/* 顶部标签 */
.hero-label {
  font-size: 0.75rem;
  color: #CCCCCC;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

/* 核心标题 */
.hero-title {
  font-size: 4rem;
  font-weight: 700;
  color: #C5A059;
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.2;
  font-family:
    "Georgia",
    "Times New Roman",
    serif;
  transition: color 0.3s ease;
}

/* 副标题说明 */
.hero-subtitle {
  font-size: 1.125rem;
  color: #5C5C5C;
  line-height: 1.6;
  max-width: 600px;
  margin: 1rem auto 0;
  font-weight: 400;
  transition: color 0.3s ease;
}

/* 暗色模式文字适配 */
[data-md-color-scheme="slate"] .hero-label {
  color: #888888;
}

[data-md-color-scheme="slate"] .hero-title {
  color: #D4AF7A;
}

[data-md-color-scheme="slate"] .hero-subtitle {
  color: #B0B0B0;
}

/* ========== About Section - 论文风格 ========== */

.about {
  width: 85%;
  max-width: 800px;
  margin: 2rem auto 6rem;
  /* 透明背景 */
  background: transparent;
  padding: 3rem 2rem;
  border: none;
  box-shadow: none;
  transition: color 0.3s ease;
}

.about h2 {
  color: #2C2C2C;
  font-size: 2rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
  font-weight: 700;
  text-align: center;
  transition: color 0.3s ease;
}

.about p {
  color: #5C5C5C;
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  text-align: left;
  transition: color 0.3s ease;
}

.about a {
  color: #C5A059;
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.3s ease;
}

.about a:hover {
  border-bottom-color: #C5A059;
}

/* About Section 暗色模式适配 */
[data-md-color-scheme="slate"] .about h2 {
  color: #D4AF7A;
}

[data-md-color-scheme="slate"] .about p {
  color: #B0B0B0;
}

[data-md-color-scheme="slate"] .about a {
  color: #D4AF7A;
}

[data-md-color-scheme="slate"] .about a:hover {
  border-bottom-color: #D4AF7A;
}

/* ========== 响应式设计 ========== */

@media (max-width: 1200px) {
  .hero-title {
    font-size: 3.5rem;
  }
}

@media (max-width: 768px) {
  .hero-content {
    padding: 1.5rem;
  }

  .hero-label {
    font-size: 0.65rem;
    letter-spacing: 1.5px;
  }

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

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

  .about {
    padding: 2rem 1.5rem;
  }

  .about h2 {
    font-size: 1.5rem;
  }

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

@media (max-width: 480px) {
  .hero-label {
    font-size: 0.6rem;
    letter-spacing: 1px;
  }

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

  .hero-subtitle {
    font-size: 0.9rem;
  }

  .about h2 {
    font-size: 1.25rem;
  }

  .about p {
    font-size: 0.95rem;
  }
}

@media (min-width: 1920px) {
  .hero-title {
    font-size: 5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }
}