/* ============================================
   Evan Homepage
   Warm minimal academic homepage
   ============================================ */

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

/*
  让 Evan 主题下的所有元素统一使用 border-box。
  padding 和 border 不会额外撑大元素尺寸。
*/
body.theme-evan,
body.theme-evan *,
body.theme-evan *::before,
body.theme-evan *::after {
  box-sizing: border-box;
}


/* ============================================
   全局主题变量
   ============================================ */

:root {
  --evan-bg: #faf9f7;
  --evan-text: #3d3929;
  --evan-accent: #c2714f;
  --evan-secondary: #8c8577;
  --evan-border: rgba(194, 113, 79, 0.2);
  --evan-shadow: rgba(194, 113, 79, 0.15);
  --evan-social-bg: #ffffff;
  --evan-social-text: #8b7355;
  --evan-footer-border: rgba(194, 113, 79, 0.15);
}


/* ============================================
   跟随系统深色模式
   ============================================ */

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --evan-bg: #1a1917;
    --evan-text: #d1cec7;
    --evan-accent: #e28a67;
    --evan-secondary: #9b9488;
    --evan-border: rgba(226, 138, 103, 0.2);
    --evan-shadow: rgba(0, 0, 0, 0.3);
    --evan-social-bg: #22211e;
    --evan-social-text: #d1cec7;
    --evan-footer-border: rgba(226, 138, 103, 0.15);
  }
}


/* ============================================
   手动深色模式
   ============================================ */

[data-theme="dark"] {
  --evan-bg: #1a1917;
  --evan-text: #d1cec7;
  --evan-accent: #e28a67;
  --evan-secondary: #9b9488;
  --evan-border: rgba(226, 138, 103, 0.2);
  --evan-shadow: rgba(0, 0, 0, 0.3);
  --evan-social-bg: #22211e;
  --evan-social-text: #d1cec7;
  --evan-footer-border: rgba(226, 138, 103, 0.15);
}


/* ============================================
   手动浅色模式
   ============================================ */

[data-theme="light"] {
  --evan-bg: #faf9f7;
  --evan-text: #3d3929;
  --evan-accent: #c2714f;
  --evan-secondary: #8c8577;
  --evan-border: rgba(194, 113, 79, 0.2);
  --evan-shadow: rgba(194, 113, 79, 0.15);
  --evan-social-bg: #ffffff;
  --evan-social-text: #8b7355;
  --evan-footer-border: rgba(194, 113, 79, 0.15);
}


/* ============================================
   页面主体
   ============================================ */

body.theme-evan {
  background: var(--evan-bg);
  color: var(--evan-text);

  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;

  font-size: 16px;
  line-height: 1.65;

  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}


/* ============================================
   全局链接
   ============================================ */

body.theme-evan a {
  color: var(--evan-accent);
  text-decoration: none;
}

body.theme-evan a:hover {
  filter: brightness(1.15);
}


/* ============================================
   顶部导航栏
   ============================================ */

body.theme-evan .top-nav {
  position: fixed;

  top: 0;
  left: 0;
  right: 0;

  height: 60px;

  display: flex;
  justify-content: center;
  align-items: center;

  background: var(--evan-bg);
  border-bottom: 1px solid var(--evan-footer-border);

  z-index: 1000;
}

body.theme-evan .nav-container {
  width: 100%;
  max-width: 1280px;

  padding: 0 40px;

  display: flex;
  align-items: center;
  justify-content: space-between;
}

/*
  顶部导航栏链接容器。

  gap 控制 About、Education、Research 等链接之间的距离。
*/
body.theme-evan .nav-left {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;

  gap: 38px;
}

body.theme-evan .nav-left a {
  color: var(--evan-text);

  font-size: 17px;
  font-weight: 600;

  white-space: nowrap;
}


/* ============================================
   深浅色模式按钮
   ============================================ */

body.theme-evan .theme-toggle {
  width: 40px;
  height: 40px;

  flex-shrink: 0;

  border: none;
  border-radius: 999px;

  background: transparent;
  color: var(--evan-text);

  cursor: pointer;
  font-size: 18px;

  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

body.theme-evan .theme-toggle:hover {
  background: var(--evan-border);
  color: var(--evan-accent);
}


/* ============================================
   页面整体容器
   ============================================ */

body.theme-evan .wrapper {
  width: 100%;
  max-width: 1120px;
  min-height: 100vh;

  margin: 0 auto;

  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
}


/* ============================================
   左侧固定个人信息栏
   ============================================ */

body.theme-evan .sidebar {
  position: fixed;

  top: 60px;
  left: calc(50% - 560px);

  width: 320px;
  height: calc(100vh - 60px);

  flex-shrink: 0;

  overflow-y: auto;

  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;

  padding-top: 60px;

  text-align: center;

  box-sizing: border-box;
  z-index: 100;
}

body.theme-evan .profile-card {
  width: 100%;

  padding: 0 20px;

  text-align: center;
}


/* ============================================
   头像
   ============================================ */

body.theme-evan .image.avatar {
  display: block;

  margin: 0 auto 28px;
}

body.theme-evan .image.avatar img {
  width: 220px;
  height: 220px;

  border-radius: 50%;

  object-fit: cover;

  box-shadow: 0 6px 24px var(--evan-shadow);
}


/* ============================================
   姓名与邮箱
   ============================================ */

body.theme-evan .site-name {
  margin: 0 0 8px;

  color: var(--evan-text);

  font-size: 28px;
  line-height: 1.2;
}

body.theme-evan .site-email {
  margin: 0 0 24px;

  color: var(--evan-secondary);

  font-size: 13px;
  font-family:
    "Ubuntu Mono",
    "SFMono-Regular",
    monospace;

  word-break: break-all;
}


/* ============================================
   社交平台图标
   ============================================ */

body.theme-evan .social-icons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;

  gap: 12px;
}

body.theme-evan .social-icons a {
  width: 40px;
  height: 40px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  border-radius: 50%;

  background: var(--evan-social-bg);
  color: var(--evan-social-text) !important;

  box-shadow: 0 2px 8px rgba(61, 57, 41, 0.08);

  transition:
    transform 0.2s ease,
    background-color 0.2s ease,
    color 0.2s ease;
}

body.theme-evan .social-icons a:hover {
  background: var(--evan-accent);
  color: #ffffff !important;

  transform: translateY(-2px);
}


/* ============================================
   左侧研究方向卡片
   ============================================ */

body.theme-evan .visitor-card {
  width: 240px;

  margin: 40px auto 0;
  padding: 18px 16px;

  border: 1px dashed var(--evan-border);
  border-radius: 14px;

  color: var(--evan-secondary);

  text-align: left;
}

body.theme-evan .visitor-card-title {
  margin-bottom: 8px;

  color: var(--evan-accent);

  font-size: 13px;
  font-weight: 600;

  text-transform: uppercase;
  letter-spacing: 0.08em;
}

body.theme-evan .visitor-card-body {
  font-size: 13px;
  line-height: 1.6;
}


/* ============================================
   右侧主要内容
   ============================================ */

body.theme-evan .content {
  flex: 1;
  min-width: 0;

  margin-left: 320px;
  padding: 120px 40px 80px 60px;
}


/* ============================================
   页面栏目与进入动画
   ============================================ */

body.theme-evan .section {
  margin-bottom: 44px;

  opacity: 0;
  transform: translateY(12px);

  transition:
    opacity 0.45s ease,
    transform 0.45s ease;
}

body.theme-evan .section.visible {
  opacity: 1;
  transform: translateY(0);
}

body.theme-evan .section-title {
  display: inline-block;

  margin: 0 0 18px;
  padding-bottom: 10px;

  border-bottom: 2px solid var(--evan-accent);

  color: var(--evan-accent);

  font-size: 19px;
  font-weight: 600;
}

body.theme-evan .section-body p {
  margin: 0 0 14px;
}


/* ============================================
   通用卡片
   ============================================ */

body.theme-evan .card {
  padding: 0;

  background: transparent;
  box-shadow: none;
}


/* ============================================
   时间线
   ============================================ */

body.theme-evan .timeline-item {
  position: relative;

  margin-left: 20px;
  padding-left: 8px;
  padding-bottom: 20px;
}

body.theme-evan .timeline-item::before {
  content: "";

  position: absolute;

  left: -20px;
  top: 0;
  bottom: 0;

  width: 2px;

  background: linear-gradient(
    to bottom,
    var(--evan-accent),
    rgba(194, 113, 79, 0.12)
  );
}

body.theme-evan .timeline-item:last-child::before {
  bottom: 50%;
}

body.theme-evan .timeline-item::after {
  content: "";

  position: absolute;

  left: -25px;
  top: 22px;

  width: 10px;
  height: 10px;

  border-radius: 50%;

  background: var(--evan-accent);
  border: 2px solid var(--evan-bg);
}


/* ============================================
   教育与工作经历
   ============================================ */

body.theme-evan .experience-item {
  display: flex;
  align-items: flex-start;

  gap: 16px;
}

body.theme-evan .institution-logo {
  width: 52px;
  height: 52px;

  flex-shrink: 0;

  object-fit: contain;
}

body.theme-evan .experience-content {
  flex: 1;
}

body.theme-evan .experience-content p {
  margin: 0 0 2px;
}

body.theme-evan .exp-title {
  color: var(--evan-text);

  font-size: 15px;
}

body.theme-evan .exp-detail {
  color: var(--evan-secondary);

  font-size: 14px;
}

body.theme-evan .exp-period {
  color: var(--evan-accent);

  font-size: 13px;
  font-weight: 500;
}


/* ============================================
   项目
   ============================================ */

body.theme-evan .project-card {
  margin-bottom: 22px;

  font-size: 15px;
  line-height: 1.7;
}


/* ============================================
   论文列表
   ============================================ */

body.theme-evan .publications ol.bibliography {
  margin: 0;
  padding: 0;

  list-style: none;
}

body.theme-evan .publications ol.bibliography li {
  margin-bottom: 14px;
  padding: 15px 0 15px 16px;

  border-left: 3px solid var(--evan-accent);
}

body.theme-evan .pub-content .title {
  margin-bottom: 4px;

  color: var(--evan-text);

  font-size: 15px;
  font-weight: 600;
}

body.theme-evan .pub-content .author {
  margin-bottom: 4px;

  color: var(--evan-secondary);

  font-size: 14px;
}

body.theme-evan .pub-content .periodical {
  margin-bottom: 6px;

  color: var(--evan-accent);

  font-size: 14px;
}

body.theme-evan .pub-content .links a {
  font-size: 13px;
  font-weight: 500;
}


/* ============================================
   奖项
   ============================================ */

body.theme-evan .awards-grid {
  display: flex;
  flex-direction: column;

  gap: 8px;
}

body.theme-evan .award-item {
  display: flex;
  align-items: center;

  gap: 10px;

  padding: 4px 0;
}

body.theme-evan .award-icon {
  flex-shrink: 0;

  font-size: 20px;
}

body.theme-evan .award-text {
  color: var(--evan-text);

  font-size: 14px;
}


/* ============================================
   页脚
   ============================================ */

body.theme-evan .site-footer {
  width: 100%;
  flex-basis: 100%;

  padding: 32px 24px 40px 380px;

  text-align: center;
}

body.theme-evan .site-footer p {
  margin: 0;
  padding-top: 20px;

  border-top: 1px solid var(--evan-footer-border);

  color: var(--evan-secondary);

  font-size: 13px;
}


/* ============================================
   标题和粗体文字颜色
   ============================================ */

body.theme-evan h1,
body.theme-evan h2,
body.theme-evan h3,
body.theme-evan h4,
body.theme-evan strong {
  color: var(--evan-text);
}


/* ============================================
   较窄桌面导航适配
   ============================================ */

@media (max-width: 1280px) {
  body.theme-evan .nav-left {
    gap: 30px;
  }

  body.theme-evan .nav-left a {
    font-size: 16px;
  }
}


/* ============================================
   更窄桌面导航适配
   ============================================ */

@media (max-width: 1180px) {
  body.theme-evan .nav-left {
    gap: 24px;
  }

  body.theme-evan .nav-left a {
    font-size: 15px;
  }
}


/* ============================================
   平板及较窄桌面适配
   ============================================ */

@media (max-width: 1080px) {
  body.theme-evan .nav-container {
    padding: 0 20px;
  }

  /*
    平板尺寸允许导航栏水平滚动，
    避免链接挤压或换行。
  */
  body.theme-evan .nav-left {
    max-width: calc(100vw - 90px);

    gap: 18px;

    overflow-x: auto;
    overflow-y: hidden;

    scrollbar-width: none;
  }

  body.theme-evan .nav-left::-webkit-scrollbar {
    display: none;
  }

  body.theme-evan .nav-left a {
    flex-shrink: 0;

    font-size: 14px;
  }

  body.theme-evan .wrapper {
    flex-direction: column;

    padding: 0 20px;
  }

  body.theme-evan .sidebar {
    position: static;
    left: auto;

    width: 100%;
    height: auto;

    padding-top: 80px;

    overflow: visible;
  }

  body.theme-evan .profile-card {
    padding: 0;
  }

  body.theme-evan .content {
    margin-left: 0;

    padding: 32px 0 48px;
  }

  body.theme-evan .site-footer {
    padding: 32px 0;
  }

  body.theme-evan .site-footer p {
    padding-top: 0;

    border-top: none;
  }
}


/* ============================================
   手机端适配
   ============================================ */

@media (max-width: 640px) {
  body.theme-evan .top-nav {
    height: 56px;
  }

  body.theme-evan .nav-container {
    padding: 0 12px;
  }

  body.theme-evan .nav-left {
    max-width: calc(100vw - 64px);

    gap: 16px;
  }

  body.theme-evan .nav-left a {
    font-size: 13px;
  }

  body.theme-evan .theme-toggle {
    width: 36px;
    height: 36px;

    font-size: 16px;
  }

  body.theme-evan .image.avatar img {
    width: 148px;
    height: 148px;
  }

  body.theme-evan .site-name {
    font-size: 24px;
  }

  body.theme-evan .experience-item {
    gap: 12px;
  }

  body.theme-evan .institution-logo {
    width: 44px;
    height: 44px;
  }

  body.theme-evan .visitor-card {
    width: 100%;
    max-width: 280px;
  }
}


/* ============================================
   小屏幕手机适配
   ============================================ */

@media (max-width: 480px) {
  body.theme-evan .section {
    margin-bottom: 32px;
  }

  body.theme-evan .section-title {
    font-size: 18px;
  }

  body.theme-evan .project-card,
  body.theme-evan .exp-detail,
  body.theme-evan .award-text,
  body.theme-evan .pub-content .author,
  body.theme-evan .pub-content .periodical {
    font-size: 13px;
  }
}