/* ===== 全局变量 ===== */
:root {
  --primary: #0a192f;
  --primary-light: #112240;
  --secondary: #1d3557;
  --accent: #e6a117;
  --accent-light: #f0c040;
  --text: #ccd6f6;
  --text-light: #8892b0;
  --white: #e6f1ff;
  --card-bg: rgba(17, 34, 64, 0.7);
  --border: rgba(230, 161, 23, 0.15);
  --gradient-start: #0a192f;
  --gradient-end: #1a1a3e;
  --success: #64ffda;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: var(--text);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent-light);
}

img {
  max-width: 100%;
  height: auto;
}

/* ===== 粒子背景 ===== */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 2rem;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar.scrolled {
  height: 60px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.5rem;
}

.nav-links a {
  padding: 0.5rem 1.2rem;
  border-radius: 8px;
  color: var(--text-light);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: rgba(230, 161, 23, 0.1);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 主内容区 ===== */
.main-content {
  position: relative;
  z-index: 1;
  padding-top: 70px;
}

/* ===== Hero 区域 ===== */
.hero {
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    ellipse at center,
    rgba(230, 161, 23, 0.05) 0%,
    transparent 70%
  );
  animation: heroGlow 8s ease-in-out infinite;
}

@keyframes heroGlow {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-3%, 3%); }
}

.hero-content {
  max-width: 800px;
  animation: fadeInUp 1s ease-out;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.2rem;
  background: rgba(230, 161, 23, 0.1);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--white), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .accent {
  -webkit-text-fill-color: var(--accent);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(230, 161, 23, 0.4);
  color: var(--primary);
}

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

.btn-outline:hover {
  background: rgba(230, 161, 23, 0.1);
  transform: translateY(-2px);
  color: var(--accent);
}

/* ===== 区域通用 ===== */
.section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--text-light);
  font-size: 1.05rem;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 2px;
  margin: 1rem auto;
}

/* ===== 卡片 ===== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(230, 161, 23, 0.3);
  box-shadow: var(--shadow);
}

/* ===== 首页特色卡片 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  text-align: center;
  padding: 2.5rem 2rem;
}

.feature-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, rgba(230, 161, 23, 0.15), rgba(230, 161, 23, 0.05));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 1px solid var(--border);
}

.feature-card h3 {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ===== 人物介绍页 ===== */
.profile-hero {
  padding: 6rem 2rem 3rem;
  text-align: center;
  position: relative;
}

.profile-avatar {
  width: 220px;
  height: 280px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  margin: 0 auto 1.5rem;
  display: block;
  object-fit: contain;
  font-size: 3.5rem;
  color: var(--primary);
  font-weight: 700;
  border: 4px solid rgba(230, 161, 23, 0.3);
  box-shadow: 0 0 40px rgba(230, 161, 23, 0.2);
}

.profile-name {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.profile-title {
  font-size: 1.15rem;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.profile-dept {
  color: var(--text-light);
  font-size: 1rem;
}

.profile-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.tag {
  padding: 0.35rem 1rem;
  background: rgba(230, 161, 23, 0.1);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent);
}

/* 信息网格 */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.info-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.info-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.info-label {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateX(-4px);
}

.timeline-item .time {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.timeline-item .place {
  color: var(--white);
  font-weight: 600;
  font-size: 1rem;
}

.timeline-item .detail {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* 论文列表 */
.paper-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.paper-item {
  padding: 1.5rem;
  border-left: 3px solid var(--accent);
}

.paper-item:hover {
  border-left-color: var(--accent-light);
}

.paper-item .paper-title {
  color: var(--white);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
  line-height: 1.5;
}

.paper-item .paper-journal {
  color: var(--accent);
  font-size: 0.85rem;
}

.paper-item .paper-meta {
  color: var(--text-light);
  font-size: 0.8rem;
  margin-top: 0.3rem;
}

/* 项目列表 */
.project-item {
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.project-item h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.project-item .project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-light);
}

.project-item .project-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.project-status {
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.project-status.active {
  background: rgba(100, 255, 218, 0.1);
  color: var(--success);
}

.project-status.completed {
  background: rgba(136, 146, 176, 0.15);
  color: var(--text-light);
}

/* ===== 博客页 ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.blog-card {
  overflow: hidden;
  transition: var(--transition);
}

.blog-card-img {
  height: 200px;
  background: linear-gradient(135deg, var(--secondary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}

.blog-card-img::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--card-bg));
}

.blog-card-body {
  padding: 1.5rem;
}

.blog-category {
  display: inline-block;
  padding: 0.25rem 0.8rem;
  background: rgba(230, 161, 23, 0.1);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.blog-card h3 {
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.blog-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ===== 导航站 ===== */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.link-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}

.link-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transform: scaleX(0);
  transition: var(--transition);
}

.link-card:hover::before {
  transform: scaleX(1);
}

.link-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.link-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.link-card h3 {
  font-size: 1.15rem;
  color: var(--white);
}

.link-card h3 small {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 400;
  margin-top: 0.2rem;
}

.link-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  flex-grow: 1;
}

.link-card .link-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.link-card .link-tags span {
  padding: 0.2rem 0.6rem;
  background: rgba(230, 161, 23, 0.08);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-light);
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.link-btn:hover {
  gap: 0.8rem;
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 2rem 2rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-light);
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}

.footer a {
  color: var(--accent);
}

.footer .copyright {
  margin-bottom: 0.8rem;
}

.footer .record-row {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer .record {
  color: var(--text-light);
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.8rem;
}

.footer .record:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer .record-ga {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.8rem;
  transition: var(--transition);
}

.footer .record-ga:hover {
  color: var(--accent);
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar {
    padding: 0 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 25, 47, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links a {
    padding: 0.8rem 1rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

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

  .section {
    padding: 3rem 1rem;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

  .profile-name {
    font-size: 2rem;
  }

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

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

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

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