/* ============================================================
   王昕熠博士个人学术网站 · 样式表
   设计：Modern Academic / Minimalist / Professional
   配色：深海军蓝、暖白、浅灰，金色点缀
   说明：纯 CSS，无外部依赖、无动画库。仅含轻微过渡效果。
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --navy:        #16335b;   /* 深海军蓝（主色） */
  --navy-dark:   #0f2547;   /* 更深海军蓝（渐变/页脚） */
  --navy-soft:   #21507f;   /* 海军蓝浅变体 */
  --gold:        #c2a24a;   /* 金色点缀 */
  --gold-soft:   #d8c07e;
  --warm-white:  #faf7f2;   /* 暖白背景 */
  --paper:       #ffffff;   /* 纯白卡片 */
  --gray:        #eef1f5;   /* 浅灰分区 */
  --text:        #1f2a37;   /* 正文深色 */
  --muted:       #5b6b7f;   /* 次要文字 */
  --line:        #dfe4ea;   /* 分隔线 */
  --radius:      14px;
  --radius-sm:   10px;
  --shadow:      0 10px 30px rgba(15, 37, 71, 0.08);
  --shadow-sm:   0 4px 14px rgba(15, 37, 71, 0.06);
  --maxw:        1120px;
  --serif:       Georgia, "Times New Roman", "Songti SC", "SimSun", "Noto Serif SC", serif;
  --sans:        -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--warm-white);
  line-height: 1.75;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }

a { color: var(--navy-soft); text-decoration: none; }
a:hover { color: var(--gold); }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航（吸顶，纯 CSS） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 37, 71, 0.96);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  color: #fff;
  font-weight: 700;
}
.brand-cn { font-size: 18px; letter-spacing: 1px; }
.brand-en { font-size: 11px; color: var(--gold-soft); letter-spacing: 0.5px; font-weight: 500; }
.brand:hover { color: #fff; }

.nav-menu {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
}
.nav-menu li a {
  display: block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.88);
  border-radius: 8px;
  font-size: 15px;
  transition: background 0.2s ease, color 0.2s ease;
}
.nav-menu li a:hover,
.nav-menu li a:focus {
  color: #fff;
  background: rgba(194, 162, 74, 0.18);
}

/* 移动端折叠控件：隐藏的 checkbox + label（纯 CSS） */
.nav-toggle { display: none; }
.nav-toggle-label {
  display: none;
  width: 42px;
  height: 42px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle-label span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

/* ---------- Hero 首屏 ---------- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: #fff;
  padding: 66px 0 74px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(194, 162, 74, 0.16), transparent 70%);
  pointer-events: none;
}
.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  position: relative;
  z-index: 1;
}
.hero-eyebrow {
  color: var(--gold-soft);
  letter-spacing: 2px;
  font-size: 13px;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.hero-name {
  font-family: var(--serif);
  font-size: clamp(40px, 6vw, 60px);
  margin: 0 0 10px;
  letter-spacing: 2px;
}
.hero-title-cn { font-size: clamp(20px, 3vw, 26px); margin: 0 0 4px; font-weight: 600; }
.hero-title-en { color: rgba(255,255,255,0.82); margin: 0 0 18px; font-size: 16px; letter-spacing: 0.5px; }
.hero-fields {
  color: var(--gold-soft);
  font-size: 14px;
  letter-spacing: 0.5px;
  margin: 0 0 18px;
}
.hero-intro {
  color: rgba(255, 255, 255, 0.9);
  max-width: 520px;
  margin: 0 0 28px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background: var(--gold);
  color: var(--navy-dark);
  border-color: var(--gold);
}
.btn-primary:hover { background: var(--gold-soft); color: var(--navy-dark); transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-soft); transform: translateY(-2px); }

/* 照片占位 */
.hero-photo { flex: 0 0 280px; }
.photo-placeholder {
  width: 280px;
  height: 340px;
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1.5px dashed rgba(216, 192, 126, 0.55);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: rgba(255,255,255,0.85);
}
.photo-monogram {
  font-family: var(--serif);
  font-size: 88px;
  color: var(--gold-soft);
  line-height: 1;
}
.photo-hint { font-size: 13px; letter-spacing: 2px; color: rgba(255,255,255,0.7); }
.photo { width: 280px; height: 340px; object-fit: cover; border-radius: var(--radius); box-shadow: var(--shadow); }

/* ---------- 通用区块 ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--gray); }
.section-eyebrow {
  color: var(--gold);
  letter-spacing: 3px;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 700;
  margin: 0 0 6px;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 38px);
  color: var(--navy);
  margin: 0 0 28px;
  position: relative;
  padding-bottom: 14px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 3px;
  background: var(--gold);
  border-radius: 2px;
}
.section-lead { color: var(--muted); margin: -12px 0 24px; }
.section-lead-en { color: var(--gold); letter-spacing: 1px; font-size: 14px; margin: -20px 0 20px; }
.sub-title { font-family: var(--serif); color: var(--navy); font-size: 22px; margin: 36px 0 8px; }
.note { color: var(--muted); font-size: 14px; margin: 10px 0 0; }

.prose p { margin: 0 0 16px; max-width: 760px; }
.prose em { color: var(--navy-soft); font-style: italic; }

/* 事实列表 */
.fact-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px 28px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}
.fact-list li { display: flex; gap: 12px; align-items: baseline; }
.fact-label { color: var(--gold); font-weight: 700; min-width: 48px; font-size: 14px; }
.fact-value { color: var(--text); }

/* ---------- 教育背景时间线 ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}
.timeline-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}
.timeline-degree {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.timeline-school { font-family: var(--serif); color: var(--navy); font-size: 20px; margin: 0 0 6px; }
.timeline-school-en { color: var(--muted); font-size: 14px; font-weight: 400; }
.timeline-field { color: var(--muted); margin: 0; font-size: 15px; }

/* ---------- 研究方向卡片 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
  gap: 22px;
}
.research-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--gold-soft);
}
.research-icon { color: var(--gold); margin-bottom: 14px; }
.research-title-cn { font-family: var(--serif); color: var(--navy); font-size: 19px; margin: 0 0 4px; }
.research-title-en { color: var(--muted); font-size: 13px; margin: 0 0 12px; letter-spacing: 0.3px; }
.research-desc { color: var(--text); font-size: 15px; margin: 0; }

/* ---------- 学术成果列表 ---------- */
.pub-list { list-style: none; margin: 0; padding: 0; counter-reset: none; }
.pub-item {
  display: flex;
  gap: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.pub-index { color: var(--gold); font-weight: 700; font-family: var(--serif); font-size: 18px; flex: 0 0 auto; }
.pub-cite { margin: 0 0 10px; font-size: 16px; }
.pub-cite em { color: var(--navy-soft); }
.pub-doi {
  font-size: 14px;
  color: var(--navy-soft);
  border-bottom: 1px solid var(--gold-soft);
  padding-bottom: 1px;
  word-break: break-all;
}
.pub-doi:hover { color: var(--gold); }

/* ---------- 教学资源下载卡片 ---------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 18px;
}
.download-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.download-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.download-icon {
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(22, 51, 91, 0.06);
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
}
.download-body { flex: 1 1 auto; min-width: 0; }
.download-name { font-family: var(--serif); color: var(--navy); font-size: 17px; margin: 0 0 4px; }
.download-desc { color: var(--muted); font-size: 14px; margin: 0 0 10px; }
.download-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.3px;
}
.badge-type { background: rgba(22, 51, 91, 0.1); color: var(--navy); }
.badge-pending { background: rgba(150, 150, 150, 0.16); color: #6b7280; }
.badge-ready { background: rgba(46, 138, 92, 0.14); color: #2e8a5c; }
.download-action { flex: 0 0 auto; }
.btn-download {
  background: var(--navy);
  color: #fff;
  border: 1.5px solid var(--navy);
  padding: 9px 20px;
  font-size: 14px;
}
.btn-download:hover { background: var(--gold); border-color: var(--gold); color: var(--navy-dark); transform: translateY(-2px); }
.btn-disabled {
  background: var(--gray);
  color: #9aa3ad;
  border: 1.5px solid var(--line);
  padding: 9px 20px;
  font-size: 14px;
  cursor: not-allowed;
}

/* ---------- 联系方式 ---------- */
.contact-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 4px solid var(--gold);
  border-radius: var(--radius);
  padding: 32px 34px;
  max-width: 560px;
  box-shadow: var(--shadow-sm);
}
.contact-name { font-family: var(--serif); color: var(--navy); font-size: 24px; margin: 0 0 4px; }
.contact-org { color: var(--muted); margin: 0 0 18px; }
.contact-list { list-style: none; margin: 0 0 22px; padding: 0; }
.contact-list li { display: flex; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.contact-label { color: var(--gold); font-weight: 700; min-width: 56px; font-size: 14px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255, 255, 255, 0.82);
  padding: 40px 0 46px;
  text-align: center;
}
.footer-inner > p { margin: 6px 0; font-size: 14px; }
.footer-copy { color: #fff; font-weight: 600; letter-spacing: 0.5px; }
.footer-org { color: rgba(255,255,255,0.78); }
.footer-icp a {
  color: var(--gold-soft);
  border-bottom: 1px solid rgba(216, 192, 126, 0.5);
  padding-bottom: 1px;
}
.footer-icp a:hover { color: #fff; }
.footer-note { color: rgba(255,255,255,0.6); font-size: 13px; }
.footer-police { color: rgba(255,255,255,0.6); font-size: 13px; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .hero-inner { flex-direction: column-reverse; text-align: center; gap: 32px; }
  .hero-id-item { border-top-color: rgba(255, 255, 255, 0.16); }
  .photo-placeholder, .photo { width: 220px; height: 268px; }
  .photo-monogram { font-size: 70px; }

  /* 移动端导航折叠 */
  .nav-toggle-label { display: flex; }
  .nav-menu {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(15, 37, 71, 0.98);
    padding: 8px 16px 16px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.28s ease;
  }
  .nav-menu li a { padding: 12px 14px; border-radius: 8px; }
  .nav-toggle:checked ~ .nav-menu { max-height: 420px; }
  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .section { padding: 56px 0; }
  .container { padding: 0 18px; }
  .download-card { flex-direction: column; align-items: flex-start; }
  .download-action { align-self: stretch; }
  .btn-disabled, .btn-download { display: block; text-align: center; }
}

/* 可访问性：尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}

/* ============================================================
   V1.1 增量样式：身份层次、学术主页入口、六卡片、荣誉、经历时间线、照片框
   ============================================================ */

/* Hero 姓名英文 + 身份层次列表 */
.hero-name-en {
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--gold-soft);
  letter-spacing: 1px;
  margin: 0 0 18px;
  font-weight: 500;
}
.hero-id {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.hero-id-item {
  padding: 16px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}
.hero-id-item:first-child { padding-top: 18px; border-top: none; }
.hero-id-cn { display: block; font-size: 18px; font-weight: 600; color: #fff; line-height: 1.45; }
.hero-id-sub { display: block; font-size: 14px; color: rgba(255, 255, 255, 0.72); margin-top: 5px; letter-spacing: 0.2px; }

/* 学术主页信息条（浅色区块内） */
.profile-bar { display: flex; gap: 14px; flex-wrap: wrap; margin: 6px 0 18px; }
.profile-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border: 1px solid var(--line); border-radius: 999px;
  background: #fff; color: var(--navy); font-size: 14px; font-weight: 600;
  transition: border-color .2s, color .2s, transform .15s;
}
.profile-pill:hover { border-color: var(--gold); color: var(--navy-dark); transform: translateY(-2px); }
.profile-pill svg { color: var(--gold); }
.contact-profiles { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0; }

/* 学术成果分组标题 + 待刊标签 + 链接 */
.pub-group {
  font-family: var(--serif); color: var(--navy); font-size: 20px;
  margin: 30px 0 14px; padding-top: 10px; border-top: 1px dashed var(--line);
}
.badge-status {
  display: inline-block; font-size: 12.5px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px;
  background: rgba(33,80,127,0.10); color: var(--navy-soft); margin-top: 8px;
}
.pub-link {
  display: inline-block; font-size: 14px; color: var(--navy-soft);
  border-bottom: 1px solid var(--gold-soft); margin-top: 8px;
}
.pub-link:hover { color: var(--gold); }
.pub-note { font-size: 13.5px; color: var(--muted); margin: 8px 0 0; }

/* 教学与荣誉卡片 */
.honor-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px; margin: 10px 0 8px;
}
.honor-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 26px; box-shadow: var(--shadow-sm); border-top: 4px solid var(--gold);
}
.honor-card-wide { grid-column: 1 / -1; }
.honor-tag {
  display: inline-block; background: rgba(22,51,91,0.08); color: var(--navy);
  font-size: 12px; font-weight: 700; letter-spacing: 0.5px;
  padding: 3px 10px; border-radius: 999px; margin-bottom: 10px;
}
.honor-year { display: block; font-family: var(--serif); color: var(--gold); font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.honor-title { font-family: var(--serif); color: var(--navy); font-size: 19px; margin: 0 0 8px; }
.honor-desc { color: var(--muted); font-size: 15px; margin: 0 0 10px; }
.honor-list { list-style: none; margin: 0; padding: 0; }
.honor-list li { padding: 6px 0; border-top: 1px solid var(--line); font-size: 15px; }
.honor-list strong { color: var(--navy); }

/* 职业与创业经历：纵向时间线 */
.exp-timeline { list-style: none; margin: 18px 0 0; padding: 0; position: relative; }
.exp-timeline::before {
  content: ""; position: absolute; left: 9px; top: 6px; bottom: 6px;
  width: 2px; background: var(--line);
}
.exp-item { position: relative; padding: 0 0 26px 38px; }
.exp-item:last-child { padding-bottom: 0; }
.exp-dot {
  position: absolute; left: 2px; top: 6px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--navy); border: 3px solid var(--paper);
  box-shadow: 0 0 0 2px var(--navy);
}
.exp-current .exp-dot { background: var(--gold); box-shadow: 0 0 0 2px var(--gold); }
.exp-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.exp-org { font-family: var(--serif); color: var(--navy); font-size: 19px; margin: 0; }
.exp-period {
  font-size: 13px; color: var(--muted); background: rgba(22,51,91,0.07);
  padding: 3px 10px; border-radius: 999px; white-space: nowrap;
}
.exp-role { color: var(--gold); font-weight: 600; margin: 4px 0 6px; font-size: 15px; }
.exp-desc { color: var(--text); font-size: 15px; margin: 0; }

/* 教学资源：六卡片（桌面 3 列，平板 2 列，手机 1 列） */
.download-grid { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .download-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .download-grid { grid-template-columns: 1fr; } }

/* 个人照片：精致白框 + 柔和阴影 */
.photo { border: 5px solid #fff; outline: 1px solid rgba(15,37,71,0.08); }

/* 联系方式：机构邮箱区块 */
.contact-email-block { padding: 12px 0; border-bottom: 1px solid var(--line); }
.contact-email-block:first-of-type { border-top: 1px solid var(--line); }
.contact-org { color: var(--muted); font-size: 14px; margin: 0 0 2px; }
.contact-email { font-size: 17px; font-weight: 600; color: var(--navy-soft); }
.contact-email:hover { color: var(--gold); }