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

:root {
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --accent-color: #ec4899;
  --dark-bg: #1e293b;
  --light-bg: #f8fafc;
  --text-dark: #1e293b;
  --text-light: #64748b;
  --white: #ffffff;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.15);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  overflow-x: hidden;
}

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

/* ===== 导航栏 ===== */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: all 0.3s ease;
}

nav.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  transition: width 0.3s ease;
}

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

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

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

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

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--text-dark);
  border-radius: 3px;
  transition: all 0.3s ease;
}

/* ===== 首页横幅 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  color: var(--white);
}

.typing-text {
  font-size: 3.5rem;
  font-weight: bold;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  animation: fadeInUp 1s ease;
}

.highlight {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  animation: fadeInUp 1s ease 0.4s both;
}

.btn {
  padding: 12px 30px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--white);
  color: var(--primary-color);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.btn-secondary:hover {
  background: var(--white);
  color: var(--primary-color);
}

.hero-image {
  animation: fadeInRight 1s ease;
}

.image-wrapper {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  transform: perspective(1000px) rotateY(-5deg);
  transition: transform 0.3s ease;
}

.image-wrapper:hover {
  transform: perspective(1000px) rotateY(0deg) scale(1.05);
}

.image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--white);
  animation: bounce 2s infinite;
}

.mouse {
  width: 30px;
  height: 50px;
  border: 2px solid var(--white);
  border-radius: 20px;
  margin: 10px auto;
  position: relative;
}

.mouse::before {
  content: '';
  width: 4px;
  height: 10px;
  background: var(--white);
  border-radius: 2px;
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 2s infinite;
}

/* ===== 区块通用样式 ===== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-dark {
  background: var(--dark-bg);
  color: var(--white);
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
  width: 100%;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

.section-dark .section-title::after {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
}

/* ===== 关于我 ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  width: 100%;
  border-radius: 20px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

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

.about-text h3 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.about-text p {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.about-info {
  display: grid;
  gap: 1.5rem;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--light-bg);
  border-radius: 10px;
  transition: transform 0.3s ease;
}

.info-item:hover {
  transform: translateX(10px);
}

.info-label {
  font-weight: 600;
  color: var(--primary-color);
  min-width: 80px;
}

.info-value {
  color: var(--text-dark);
}

/* ===== 技能展示 ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 20px;
  text-align: center;
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.skill-card:hover {
  transform: translateY(-10px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-hover);
}

.skill-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.skill-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.tag {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.tag:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* ===== 项目展示 ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--white);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.project-image {
  height: 200px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.project-placeholder {
  color: var(--white);
  font-size: 2rem;
  font-weight: bold;
  z-index: 1;
}

.project-content {
  padding: 2rem;
}

.project-content h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.project-content p {
  color: var(--text-light);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-tags .tag {
  background: var(--light-bg);
  color: var(--text-dark);
  padding: 0.4rem 0.8rem;
  border-radius: 15px;
  font-size: 0.85rem;
}

.project-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
}

.project-link:hover {
  transform: translateX(5px);
}

/* ===== 联系方式 ===== */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-info h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.contact-info p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  line-height: 1.8;
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--white);
  text-decoration: none;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  transition: all 0.3s ease;
}

.social-link:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(10px);
}

.social-link span {
  font-size: 1.5rem;
}

/* 社交媒体图标样式 */
.social-icon {
  width: 24px;
  height: 24px;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  transition: transform 0.3s ease;
}

.social-link:hover .social-icon {
  transform: scale(1.2) rotate(5deg);
}

/* CSDN图标特殊样式 */
.csdn-icon {
  color: #FC5531; /* CSDN品牌色 - 橙红色 */
  width: 24px;
  height: 24px;
  filter: drop-shadow(0 2px 4px rgba(252, 85, 49, 0.3));
}

.social-link:hover .csdn-icon {
  color: #FF6B4A; /* 悬停时更亮的颜色 */
  filter: drop-shadow(0 4px 8px rgba(255, 107, 74, 0.5));
  transform: scale(1.2) rotate(5deg);
}

.contact-form {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  background: rgba(255, 255, 255, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== 留言板 ===== */
.message-board {
  max-width: 1000px;
  margin: 0 auto;
}

.message-form-wrapper {
  background: var(--white);
  padding: 2rem;
  border-radius: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 3rem;
}

.message-form .form-group input,
.message-form .form-group textarea {
  background: var(--light-bg);
  border: 1px solid #e2e8f0;
  color: var(--text-dark);
}

.message-form .form-group input::placeholder,
.message-form .form-group textarea::placeholder {
  color: var(--text-light);
}

.message-form .form-group input:focus,
.message-form .form-group textarea:focus {
  background: var(--white);
  border-color: var(--primary-color);
}

.message-list-wrapper h3 {
  margin-bottom: 1.5rem;
  color: var(--text-dark);
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.message-item {
  background: var(--white);
  padding: 1.5rem;
  border-radius: 15px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  border-left: 4px solid var(--primary-color);
  transition: all 0.3s ease;
}

.message-item:hover {
  transform: translateX(5px);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.message-item strong {
  color: var(--primary-color);
  font-size: 1.1rem;
}

.message-item p {
  margin: 0.5rem 0;
  color: var(--text-dark);
  line-height: 1.6;
}

.message-time {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--dark-bg);
  color: var(--white);
  text-align: center;
  padding: 2rem 0;
}

.footer p {
  margin: 0.5rem 0;
  opacity: 0.8;
}

/* ===== 返回顶部按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

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

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes scroll {
  0% {
    opacity: 1;
    top: 10px;
  }
  100% {
    opacity: 0;
    top: 30px;
  }
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: var(--white);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: 2rem 0;
  }

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

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .typing-text {
    font-size: 2.5rem;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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

  .skills-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  .typing-text {
    font-size: 2rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}