/* =========================================================================
   舒韵博士学术网站 · 样式表
   设计语言：清新 · 通透 · 可信赖。明亮青 cyan + 薄荷 teal + 少量暖琥珀点缀，
   大量留白、轻盈阴影、柔和渐变 —— 干净的"实验室晨光"观感。
   ========================================================================= */

:root {
  --primary:    #0E7490;   /* 清新青 · 主色（干净、可信） */
  --primary-d:  #155E75;   /* 深青 · 悬停/强调 */
  --primary-l:  #06B6D4;   /* 亮青 · 高亮 */
  --teal:       #0D9488;   /* 薄荷青 · 次强调 */
  --teal-l:     #14B8A6;
  --gold:       #F59E0B;   /* 暖琥珀 · 少量点缀 */
  --coral:      #FB7185;   /* 珊瑚粉 · 少量点缀 */
  --ink:        #1E2A38;   /* 正文（柔和深青灰） */
  --muted:      #5B6B7B;   /* 次要文字 */
  --faint:      #93A3B3;
  --line:       #E4ECF1;   /* 更浅的分割线 */
  --bg:         #F5FAFB;   /* 清新微青底 */
  --surface:    #FFFFFF;
  --surface-2:  #EEF5F8;   /* 淡青灰面板 */
  --hero-a:     #0891B2;   /* 首页 Hero 渐变：明亮青 → 薄荷 */
  --hero-b:     #14B8A6;
  --hero-c:     #38BDF8;
  --shadow-sm:  0 1px 3px rgba(8,70,90,.05), 0 1px 2px rgba(8,70,90,.04);
  --shadow:     0 10px 30px rgba(8,70,90,.09);
  --shadow-lg:  0 22px 54px rgba(8,70,90,.13);
  --radius:     18px;
  --radius-sm:  13px;
  --maxw:       1180px;
  --nav-h:      66px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.72;
  font-size: 16px;
  letter-spacing: .1px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--teal); text-decoration: none; }
a:hover { color: var(--primary); }
h1,h2,h3,h4 { line-height: 1.3; color: var(--primary); margin: 0 0 .5em; font-weight: 700; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; scroll-margin-top: var(--nav-h); }
.section.alt { background: var(--surface); }
.section.tight { padding: 60px 0; }

/* ---------- 通用：区块标题 ---------- */
.sec-head { max-width: 720px; margin: 0 auto 44px; text-align: center; }
.sec-head .kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: var(--teal); margin-bottom: 12px;
}
.sec-head .kicker::before, .sec-head .kicker::after { content:""; width: 26px; height: 2px; background: var(--gold); border-radius: 2px; }
.sec-head h2 { font-size: clamp(26px, 3.4vw, 38px); margin-bottom: 10px; }
.sec-head p { color: var(--muted); margin: 0; }

/* =========================================================================
   顶部导航
   ========================================================================= */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s;
}
.nav.scrolled { box-shadow: var(--shadow-sm); }
.nav .inner { max-width: var(--maxw); margin: 0 auto; height: 100%; padding: 0 24px; display: flex; align-items: center; gap: 18px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; color: var(--primary); font-size: 18px; letter-spacing: .3px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 11px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--primary), var(--teal));
  display: grid; place-items: center; color: #fff; font-size: 15px; font-weight: 800;
  box-shadow: var(--shadow-sm);
}
.brand small { display:block; font-size: 11px; color: var(--muted); font-weight: 500; letter-spacing: 1px; }
.nav-links { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav-links a {
  position: relative; color: var(--ink); font-size: 14.5px; font-weight: 500;
  padding: 9px 12px; border-radius: 8px; transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--primary); background: var(--surface-2); }
.nav-links a.active { color: var(--teal); font-weight: 700; }
.nav-links a.active::after {
  content:""; position: absolute; left: 12px; right: 12px; bottom: 4px; height: 2px;
  background: var(--gold); border-radius: 2px;
}
.lang-toggle {
  display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden;
  margin-left: 10px; background: var(--surface);
}
.lang-toggle button {
  border: 0; background: transparent; padding: 6px 12px; font-size: 13px; font-weight: 700;
  color: var(--muted); cursor: pointer; font-family: inherit;
}
.lang-toggle button.active { background: var(--primary); color: #fff; }
.nav .cta-small {
  margin-left: 6px; background: var(--teal); color:#fff !important; padding: 8px 16px; border-radius: 999px;
  font-weight: 700; font-size: 13.5px; box-shadow: var(--shadow-sm);
}
.nav .cta-small:hover { background: var(--teal-l); }
.hamburger { display: none; margin-left:auto; width:42px; height:42px; border:1px solid var(--line); border-radius:10px; background:var(--surface); cursor:pointer; }
.hamburger span, .hamburger span::before, .hamburger span::after {
  content:""; display:block; width:20px; height:2px; background: var(--primary); border-radius:2px; margin:0 auto; position:relative; transition:.3s;
}
.hamburger span::before { position:absolute; top:-6px; } .hamburger span::after { position:absolute; top:6px; }
.hamburger.open span { background:transparent; }
.hamburger.open span::before { top:0; transform: rotate(45deg); }
.hamburger.open span::after { top:0; transform: rotate(-45deg); }

/* =========================================================================
   Hero
   ========================================================================= */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(135deg, var(--hero-a) 0%, var(--teal) 55%, var(--hero-b) 100%);
  padding: 88px 0 100px;
}
.hero .hex { position:absolute; inset:0; opacity:.4; pointer-events:none; }
.hero .glow { position:absolute; width:560px; height:560px; border-radius:50%; filter:blur(96px); opacity:.4; pointer-events:none; }
.hero .glow.g1 { background: var(--hero-c); top:-180px; right:-90px; }
.hero .glow.g2 { background: var(--gold); bottom:-220px; left:-130px; opacity:.26; }
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1.35fr .9fr; gap: 48px; align-items: center; }
.hero .eyebrow { display:inline-flex; align-items:center; gap:9px; background: rgba(255,255,255,.12); border:1px solid rgba(255,255,255,.22); padding:7px 15px; border-radius:999px; font-size:13px; font-weight:600; letter-spacing:.6px; margin-bottom:20px; }
.hero .eyebrow .dot { width:8px;height:8px;border-radius:50%;background:var(--gold); box-shadow:0 0 0 4px rgba(232,163,61,.25); }
.hero h1 { color:#fff; font-size: clamp(32px, 5vw, 54px); margin: 0 0 8px; font-weight:800; letter-spacing:.5px; }
.hero .sub { color: rgba(255,255,255,.82); font-size: clamp(15px,1.6vw,18px); margin: 0 0 6px; font-weight:500; }
.hero .sub .teal { color: #5fe0d8; font-weight:700; }
.hero .lede { color: rgba(255,255,255,.72); max-width: 560px; margin: 18px 0 28px; font-size: 15px; }
.hero .actions { display:flex; gap:14px; flex-wrap:wrap; }
.btn { display:inline-flex; align-items:center; gap:9px; padding:13px 24px; border-radius:999px; font-weight:700; font-size:14.5px; cursor:pointer; border:1px solid transparent; transition:.22s; font-family:inherit; }
.btn-primary { background: var(--teal-l); color:#04262b; box-shadow: 0 10px 26px rgba(20,184,176,.34); }
.btn-primary:hover { background:#3fe0d7; color:#04262b; transform: translateY(-2px); }
.btn-ghost { background: transparent; color:#fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.12); color:#fff; }
.btn-solid { background: var(--primary); color:#fff; }
.btn-solid:hover { background: var(--primary-d); }

/* Hero 右：头像卡片 */
.hero-card {
  background: rgba(255,255,255,.10); border:1px solid rgba(255,255,255,.20);
  border-radius: 22px; padding: 26px; backdrop-filter: blur(8px);
  display:flex; flex-direction:column; align-items:center; gap:16px; text-align:center;
  box-shadow: 0 24px 60px rgba(0,0,0,.28);
}
.avatar {
  width: 148px; height:148px; border-radius:50%; overflow:hidden; flex:0 0 auto;
  background: linear-gradient(135deg,#ffffff22,#ffffff11);
  border: 3px solid rgba(255,255,255,.5); display:grid; place-items:center;
  box-shadow: 0 14px 34px rgba(0,0,0,.3);
}
.avatar .mono { font-size:52px; font-weight:800; color:#fff; letter-spacing:2px; }
.avatar img { width:100%; height:100%; object-fit:cover; }
.hero-card .name { color:#fff; font-size:20px; font-weight:800; }
.hero-card .role { color: rgba(255,255,255,.78); font-size:13.5px; }
.hero-card .chips { display:flex; gap:8px; flex-wrap:wrap; justify-content:center; }
.hero-card .chip { font-size:11.5px; padding:5px 11px; border-radius:999px; background:rgba(255,255,255,.14); border:1px solid rgba(255,255,255,.2); }

/* 数据看板 */
.stats { margin-top: 56px; display:grid; grid-template-columns: repeat(4,1fr); gap:16px; position:relative; z-index:2; }
.stat { background: rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.16); border-radius:16px; padding:20px 18px; text-align:center; backdrop-filter: blur(6px); }
.stat .num { font-size: clamp(26px,3vw,36px); font-weight:800; color:#fff; line-height:1.1; }
.stat .num .plus { color: var(--gold); }
.stat .lbl { color: rgba(255,255,255,.72); font-size:13px; margin-top:6px; }
.stats-wrap { position:relative; z-index:2; }

/* =========================================================================
   关于
   ========================================================================= */
.about-grid { display:grid; grid-template-columns: .9fr 1.1fr; gap:44px; align-items:start; }
.id-card { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); box-shadow:var(--shadow); overflow:hidden; }
.id-card .banner { height:120px; background: linear-gradient(120deg,var(--primary),var(--teal)); position:relative; }
.id-card .banner::after { content:""; position:absolute; inset:0; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cg fill='none' stroke='%23ffffff' stroke-opacity='.18' stroke-width='1.2'%3E%3Cpath d='M20 4l13 7.5v15L20 34 7 26.5v-15z'/%3E%3C/g%3E%3C/svg%3E"); }
.id-card .body { padding: 0 26px 26px; margin-top:-52px; position:relative; }
.id-card .body .avatar2 { width:104px;height:104px;border-radius:50%;background:var(--surface);border:4px solid var(--surface);box-shadow:var(--shadow);display:grid;place-items:center;overflow:hidden; }
.id-card .body .avatar2 .mono { font-size:34px;font-weight:800;color:var(--primary); }
.id-card .body .avatar2 img { width:100%;height:100%;object-fit:cover; }
.id-card h3 { margin:14px 0 2px; font-size:22px; }
.id-card .role { color:var(--teal); font-weight:700; font-size:14px; }
.id-card .affil { color:var(--muted); font-size:13.5px; margin-bottom:16px; }
.contact-lines { border-top:1px solid var(--line); padding-top:18px; display:grid; gap:10px; font-size:14px; }
.contact-lines div { display:flex; gap:10px; align-items:flex-start; color:var(--ink); }
.contact-lines .ic { width:18px; flex:0 0 auto; color:var(--teal); margin-top:3px; }

.bio { color:var(--ink); font-size:15.5px; }
.bio p { color:#33475b; }
.bio strong { color:var(--primary); }

/* 时间线（教育 / 工作） */
.tl { position:relative; margin: 8px 0 0; padding-left: 26px; }
.tl::before { content:""; position:absolute; left:8px; top:6px; bottom:6px; width:2px; background:var(--line); }
.tl .node { position:relative; margin-bottom:22px; }
.tl .node::before { content:""; position:absolute; left:-23px; top:6px; width:13px; height:13px; border-radius:50%; background:var(--surface); border:3px solid var(--teal); box-shadow:0 0 0 3px var(--bg); }
.tl .node .period { font-size:12.5px; font-weight:800; color:var(--teal); letter-spacing:.5px; }
.tl .node h4 { margin:2px 0 1px; font-size:16.5px; color:var(--primary); }
.tl .node .meta { color:var(--muted); font-size:13.5px; }
.two-col { display:grid; grid-template-columns:1fr 1fr; gap:36px; }
.block-title { display:flex; align-items:center; gap:10px; margin: 34px 0 18px; font-size:19px; color:var(--primary); }
.block-title:first-child { margin-top:0; }
.block-title .bar { width:5px;height:20px;border-radius:3px;background:var(--gold); }
.social-list { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.social-list li { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:13px 16px; font-size:13.5px; color:#33475b; display:flex; gap:10px; align-items:flex-start; box-shadow:var(--shadow-sm); }
.social-list li .ic { color:var(--teal); flex:0 0 auto; margin-top:1px; }

/* =========================================================================
   研究领域（卡片）
   ========================================================================= */
.research-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.rcard { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:26px 24px; box-shadow:var(--shadow-sm); transition:.28s; position:relative; overflow:hidden; }
.rcard::before { content:""; position:absolute; left:0; top:0; width:100%; height:4px; background:linear-gradient(90deg,var(--teal),var(--gold)); transform:scaleX(0); transform-origin:left; transition:.3s; }
.rcard:hover { transform:translateY(-6px); box-shadow:var(--shadow-lg); border-color:transparent; }
.rcard:hover::before { transform:scaleX(1); }
.rcard .ricon { width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--teal));display:grid;place-items:center;color:#fff;margin-bottom:16px;box-shadow:var(--shadow-sm); }
.rcard h3 { font-size:17.5px; margin-bottom:8px; }
.rcard p { color:var(--muted); font-size:14px; margin:0; }

/* =========================================================================
   论文成果
   ========================================================================= */
.pub-toolbar { display:flex; gap:14px; flex-wrap:wrap; align-items:center; margin-bottom:24px; }
.search-box { position:relative; flex:1 1 260px; max-width:420px; }
.search-box input { width:100%; padding:12px 16px 12px 42px; border:1px solid var(--line); border-radius:999px; background:var(--surface); font-family:inherit; font-size:14px; color:var(--ink); box-shadow:var(--shadow-sm); }
.search-box input:focus { outline:none; border-color:var(--teal); box-shadow:0 0 0 3px rgba(14,149,148,.15); }
.search-box .ic { position:absolute; left:15px; top:50%; transform:translateY(-50%); color:var(--faint); }
.filters { display:flex; gap:8px; flex-wrap:wrap; }
.fchip { padding:8px 15px; border-radius:999px; border:1px solid var(--line); background:var(--surface); font-size:13px; font-weight:600; color:var(--muted); cursor:pointer; transition:.18s; font-family:inherit; }
.fchip:hover { border-color:var(--teal); color:var(--teal); }
.fchip.active { background:var(--primary); color:#fff; border-color:var(--primary); }
.pub-count { margin-left:auto; color:var(--faint); font-size:13px; }

.pub-list { display:grid; gap:14px; }
.pub { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:18px 22px; box-shadow:var(--shadow-sm); display:grid; grid-template-columns:auto 1fr; gap:6px 18px; transition:.2s; }
.pub:hover { border-color:var(--teal); box-shadow:var(--shadow); }
.pub .yr { grid-column:1; font-weight:800; color:var(--primary); font-size:15px; align-self:start; min-width:52px; }
.pub .main { grid-column:2; }
.pub .authors { color:var(--muted); font-size:13px; }
.pub .authors b { color:var(--ink); }
.pub .ptitle { color:var(--ink); font-size:15.5px; font-weight:600; margin:2px 0; }
.pub .ref { color:var(--teal); font-size:13.5px; font-style:italic; }
.pub .tags { grid-column:1 / -1; display:flex; gap:8px; margin-top:8px; flex-wrap:wrap; }
.pub .tag { font-size:11px; padding:3px 10px; border-radius:999px; background:var(--surface-2); color:var(--muted); font-weight:700; letter-spacing:.4px; }
.pub .tag.first { background:rgba(14,149,148,.14); color:var(--teal); }
.pub .tag.cor { background:rgba(232,163,61,.18); color:#b4741a; }
.pub .empty { text-align:center; color:var(--faint); padding:40px; }
.scholar-note { text-align:center; margin-top:26px; color:var(--muted); font-size:14px; }
.scholar-note a { font-weight:700; }

/* =========================================================================
   项目（卡片时间线）
   ========================================================================= */
.proj-list { display:grid; gap:18px; }
.proj { background:var(--surface); border:1px solid var(--line); border-left:5px solid var(--teal); border-radius:var(--radius-sm); padding:20px 24px; box-shadow:var(--shadow-sm); display:grid; grid-template-columns: 150px 1fr; gap:8px 20px; align-items:baseline; }
.proj .lvl { font-weight:800; color:var(--teal); font-size:13px; }
.proj h3 { grid-column:2; font-size:16.5px; margin:0 0 6px; }
.proj .pmeta { grid-column:1 / -1; display:flex; gap:18px; flex-wrap:wrap; color:var(--muted); font-size:13px; margin-top:6px; }
.proj .pmeta span { display:inline-flex; gap:6px; align-items:center; }
.proj .rank-badge { grid-column:1; align-self:center; justify-self:start; font-size:11.5px; font-weight:800; color:#b4741a; background:rgba(232,163,61,.16); padding:5px 12px; border-radius:999px; }

/* =========================================================================
   教学
   ========================================================================= */
.course-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:18px; margin-bottom:36px; }
.course { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:20px 22px; box-shadow:var(--shadow-sm); display:flex; align-items:center; gap:16px; }
.course .cicon { width:46px;height:46px;border-radius:12px;background:var(--surface-2);display:grid;place-items:center;color:var(--primary);flex:0 0 auto; }
.course h4 { margin:0; font-size:16px; }
.course .ctype { color:var(--teal); font-size:12.5px; font-weight:700; }
.achv-list { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.achv-list li { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:14px 18px; font-size:14px; color:#33475b; display:flex; gap:11px; align-items:flex-start; box-shadow:var(--shadow-sm); }
.achv-list .ic { color:var(--gold); flex:0 0 auto; margin-top:2px; }

/* =========================================================================
   学生与招生
   ========================================================================= */
.students-grid { display:grid; grid-template-columns: 1fr 1fr; gap:32px; }
.recruit-card { background: linear-gradient(135deg,var(--primary),var(--teal)); color:#fff; border-radius:var(--radius); padding:34px 30px; box-shadow:var(--shadow); }
.recruit-card .tag { display:inline-block; background:rgba(255,255,255,.16); border:1px solid rgba(255,255,255,.3); padding:6px 14px; border-radius:999px; font-size:12px; font-weight:700; letter-spacing:1px; margin-bottom:16px; }
.recruit-card h3 { color:#fff; font-size:22px; }
.recruit-card p { color:rgba(255,255,255,.85); font-size:15px; }
.recruit-card .dir { margin-top:14px; display:grid; gap:10px; }
.recruit-card .dir li { display:flex; gap:10px; align-items:flex-start; font-size:14px; color:#fff; }
.recruit-card .dir .ic { color:var(--gold); margin-top:2px; flex:0 0 auto; }
.recruit-card .btn { margin-top:20px; background:#fff; color:var(--primary); }

/* =========================================================================
   获奖
   ========================================================================= */
.award-cols { display:grid; grid-template-columns:1fr 1fr; gap:32px; }
.award-group h3 { font-size:17px; margin-bottom:16px; display:flex; align-items:center; gap:10px; }
.award-group h3 .ic { color:var(--gold); }
.award-list li { display:flex; gap:12px; padding:13px 0; border-bottom:1px dashed var(--line); font-size:14px; color:#33475b; }
.award-list li:last-child { border-bottom:0; }
.award-list .ic { color:var(--teal); flex:0 0 auto; margin-top:2px; }

/* =========================================================================
   新闻
   ========================================================================= */
.news-list { display:grid; gap:14px; }
.news { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:18px 22px; box-shadow:var(--shadow-sm); display:flex; gap:18px; align-items:center; transition:.2s; }
.news:hover { border-color:var(--teal); transform:translateX(4px); }
.news .ndate { font-weight:800; color:var(--teal); font-size:13.5px; min-width:78px; }
.news .ntitle { font-size:15px; color:var(--ink); font-weight:600; margin:0; }

/* =========================================================================
   相册
   ========================================================================= */
.gallery-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.gitem { aspect-ratio: 4/3; border-radius:var(--radius-sm); overflow:hidden; position:relative; background:var(--surface-2); border:1px dashed var(--line); display:grid; place-items:center; color:var(--faint); }
.gitem img { width:100%; height:100%; object-fit:cover; }
.gitem .cap { position:absolute; left:0; right:0; bottom:0; padding:22px 12px 10px; font-size:12px; color:#fff; background:linear-gradient(transparent, rgba(8,43,68,.85)); }
.gitem .ph { text-align:center; font-size:12.5px; padding:10px; }
.gitem .ph .ic { display:block; margin:0 auto 8px; color:var(--faint); }

/* =========================================================================
   联系
   ========================================================================= */
.contact-grid { display:grid; grid-template-columns: .85fr 1.15fr; gap:40px; }
.contact-info { display:grid; gap:16px; }
.cinfo { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:18px 20px; box-shadow:var(--shadow-sm); display:flex; gap:14px; align-items:flex-start; }
.cinfo .ic { width:42px;height:42px;border-radius:11px;background:var(--surface-2);display:grid;place-items:center;color:var(--teal);flex:0 0 auto; }
.cinfo h4 { margin:0 0 2px; font-size:14px; color:var(--primary); }
.cinfo p, .cinfo a { margin:0; color:var(--muted); font-size:14px; }
.cinfo a:hover { color:var(--teal); }
.contact-form { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:30px; box-shadow:var(--shadow); }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.field { margin-bottom:16px; }
.field label { display:block; font-size:13px; font-weight:700; color:var(--ink); margin-bottom:7px; }
.field input, .field textarea, .field select { width:100%; padding:12px 14px; border:1px solid var(--line); border-radius:var(--radius-sm); background:var(--bg); font-family:inherit; font-size:14px; color:var(--ink); transition:.18s; }
.field input:focus, .field textarea:focus, .field select:focus { outline:none; border-color:var(--teal); background:#fff; box-shadow:0 0 0 3px rgba(14,149,148,.15); }
.field textarea { resize:vertical; min-height:120px; }
.form-msg { margin-top:14px; font-size:14px; padding:12px 16px; border-radius:var(--radius-sm); display:none; }
.form-msg.ok { display:block; background:rgba(13,148,136,.12); color:var(--teal); }
.form-msg.err { display:block; background:rgba(251,113,133,.12); color:var(--coral); }

/* =========================================================================
   在线留言（Guestbook）
   ========================================================================= */
.guestbook { margin: 6px 0 8px; }
.gb-form { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:26px; box-shadow:var(--shadow-sm); }
.gb-note { font-size:12.5px; color:var(--faint); margin:12px 0 0; }
.gb-wall { margin-top:20px; display:grid; gap:12px; }
.gb-item { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:15px 18px; box-shadow:var(--shadow-sm); }
.gb-head { display:flex; align-items:center; gap:10px; margin-bottom:6px; }
.gb-name { font-weight:800; color:var(--primary); font-size:15px; }
.gb-time { font-size:12px; color:var(--faint); }
.gb-text { color:#33475b; font-size:14.5px; white-space:pre-wrap; line-height:1.7; }
.gb-reply { margin-top:9px; background:#F0F9FF; border:1px dashed #BAE6FD; border-radius:8px; padding:8px 12px; font-size:13.5px; color:#0C4A6E; }
.gb-empty { text-align:center; color:var(--faint); padding:24px; }

/* =========================================================================
   在线课程课件（占位）
   ========================================================================= */
.courseware { display:flex; gap:18px; align-items:flex-start; background:linear-gradient(120deg,#EFF9FB,#F0FBF7); border:1px dashed var(--teal); border-radius:var(--radius); padding:26px 28px; margin-bottom:8px; }
.courseware .cw-icon { width:52px; height:52px; border-radius:14px; background:linear-gradient(135deg,var(--primary),var(--teal)); display:grid; place-items:center; color:#fff; flex:0 0 auto; box-shadow:var(--shadow-sm); }
.courseware h4 { margin:0 0 6px; font-size:17px; color:var(--primary); }
.courseware p { margin:0; color:var(--muted); font-size:14.5px; line-height:1.75; }

/* =========================================================================
   管理员发布的文章（新闻/会议动态卡片）
   ========================================================================= */
.dyn-list { display:grid; gap:18px; margin-bottom:34px; }
.dyn-post { background:var(--surface); border:1px solid var(--line); border-left:5px solid var(--teal); border-radius:var(--radius-sm); padding:22px 26px; box-shadow:var(--shadow-sm); }
.dp-head { display:flex; align-items:center; gap:12px; flex-wrap:wrap; margin-bottom:10px; }
.dp-cat { font-size:11.5px; font-weight:800; padding:4px 12px; border-radius:999px; background:rgba(13,148,136,.12); color:var(--teal); }
.dp-title { margin:0; font-size:18px; color:var(--primary); flex:1 1 auto; }
.dp-date { font-size:12.5px; color:var(--faint); font-weight:700; }
.dp-img { width:100%; max-height:320px; object-fit:cover; border-radius:10px; margin:6px 0 12px; }
.dp-body { color:#33475b; font-size:14.5px; line-height:1.8; white-space:pre-wrap; }

/* =========================================================================
   页脚
   ========================================================================= */
.footer { background: #EEF5F8; color: var(--muted); padding: 58px 0 28px; border-top: 1px solid var(--line); }
.footer .fgrid { display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap:40px; }
.footer h4 { color: var(--primary); font-size:15px; margin-bottom:14px; }
.footer .fbrand { display:flex; align-items:center; gap:11px; color:var(--primary); font-weight:800; font-size:18px; margin-bottom:12px; }
.footer p, .footer a { color:var(--muted); font-size:13.5px; }
.footer a:hover { color:var(--primary); }
.footer ul li { margin-bottom:9px; }
.footer .socials { display:flex; gap:10px; margin-top:14px; }
.footer .socials a { width:38px;height:38px;border-radius:11px;background:rgba(14,116,144,.09);display:grid;place-items:center;color:var(--primary);transition:.2s; }
.footer .socials a:hover { background:var(--teal); color:#fff; }
.footer .bottom { border-top:1px solid var(--line); margin-top:40px; padding-top:20px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:12.5px; color:var(--faint); }
.footer .fmeta { display:flex; align-items:center; gap:14px; flex-wrap:wrap; }
.footer .visit-count { display:inline-flex; align-items:center; gap:5px; color:var(--muted); font-weight:600; }
.footer .admin-link { color:var(--faint); font-size:12px; padding:2px 9px; border:1px solid var(--line); border-radius:999px; transition:.18s; }
.footer .admin-link:hover { color:var(--primary); border-color:var(--primary); }

/* 返回顶部 */
.to-top { position:fixed; right:22px; bottom:22px; width:46px;height:46px;border-radius:12px;background:var(--primary);color:#fff;border:0;cursor:pointer;box-shadow:var(--shadow-lg);display:grid;place-items:center;opacity:0;transform:translateY(12px);pointer-events:none;transition:.3s;z-index:90; }
.to-top.show { opacity:1; transform:none; pointer-events:auto; }
.to-top:hover { background:var(--teal); }

/* =========================================================================
   动画
   ========================================================================= */
.reveal { opacity:0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity:1; transform:none; transition:none; } html { scroll-behavior:auto; } }

/* =========================================================================
   响应式
   ========================================================================= */
@media (max-width: 980px) {
  .hero .container { grid-template-columns:1fr; gap:34px; text-align:center; }
  .hero .lede { margin-left:auto; margin-right:auto; }
  .hero .actions { justify-content:center; }
  .hero-card { max-width:420px; margin:0 auto; width:100%; }
  .about-grid { grid-template-columns:1fr; }
  .research-grid { grid-template-columns:1fr 1fr; }
  .contact-grid { grid-template-columns:1fr; }
  .students-grid { grid-template-columns:1fr; }
  .footer .fgrid { grid-template-columns:1fr 1fr; }
}
@media (max-width: 720px) {
  .section { padding:56px 0; }
  .nav-links { position:fixed; inset:var(--nav-h) 0 auto 0; flex-direction:column; align-items:stretch; gap:0; background:var(--surface); box-shadow:var(--shadow-lg); padding:12px; transform:translateY(-140%); transition:transform .3s; margin:0; max-height:calc(100vh - var(--nav-h)); overflow:auto; }
  .nav-links.open { transform:none; }
  .nav-links a { padding:13px 14px; border-radius:10px; }
  .nav-links a.active::after { display:none; }
  .lang-toggle { margin:10px 0; align-self:flex-start; }
  .hamburger { display:block; }
  .stats { grid-template-columns:1fr 1fr; }
  .two-col, .course-grid, .achv-list, .award-cols, .social-list { grid-template-columns:1fr; }
  .research-grid { grid-template-columns:1fr; }
  .gallery-grid { grid-template-columns:1fr 1fr; }
  .form-row { grid-template-columns:1fr; }
  .footer .fgrid { grid-template-columns:1fr; }
  .pub { grid-template-columns:1fr; }
  .pub .yr, .pub .main, .pub .tags { grid-column:1; }
  .proj { grid-template-columns:1fr; }
  .proj h3, .proj .pmeta, .proj .lvl, .proj .rank-badge { grid-column:1; }
}

/* =========================================================================
   多页面版 · v2 新组件
   ========================================================================= */
.skip-link { position:absolute; left:-9999px; top:0; background:var(--primary); color:#fff; padding:10px 16px; z-index:200; border-radius:0 0 8px 0; }
.skip-link:focus { left:0; }

.container.wide { max-width: 1280px; }

/* 内页横幅（面包屑 + 标题） */
.page-hero {
  position:relative; overflow:hidden; color:#fff;
  background: linear-gradient(120deg, var(--primary) 0%, var(--teal) 62%, var(--hero-b) 130%);
  padding: 56px 0 60px;
}
.page-hero::before {
  content:""; position:absolute; inset:0;
  background: url("../img/hero-light.webp") center/cover no-repeat;
  opacity:.20; pointer-events:none;
}
.page-hero .container { position:relative; }
.page-hero .crumb { font-size:13px; color:rgba(255,255,255,.66); margin-bottom:12px; display:flex; align-items:center; gap:8px; }
.page-hero .crumb a { color:rgba(255,255,255,.82); }
.page-hero .crumb a:hover { color:#fff; }
.page-hero .crumb .sep { opacity:.5; }
.page-hero h1 { color:#fff; font-size:clamp(28px,4vw,42px); margin:0; font-weight:800; letter-spacing:.5px; }

/* 首页 Hero 背景图层 */
.hero .hexbg { position:absolute; inset:0; opacity:.5; pointer-events:none; }
.hero .hero-bgimg { position:absolute; inset:0; background:url("../img/hero-light.webp") center/cover no-repeat; opacity:.22; pointer-events:none; }

/* 区块 CTA */
.sec-cta { text-align:center; margin-top:42px; }
.btn-ghost-dark { background:transparent; color:var(--primary); border-color:var(--line); }
.btn-ghost-dark:hover { border-color:var(--teal); color:var(--teal); }

/* 首页：带图研究卡片 */
.research-grid.rgrid-img { grid-template-columns:repeat(3,1fr); }
.rcard-img { display:block; padding:0; }
.rcard-img .rimg { height:150px; overflow:hidden; background:var(--surface-2); }
.rcard-img .rimg img { width:100%; height:100%; object-fit:cover; transition:transform .5s; }
.rcard-img:hover .rimg img { transform:scale(1.06); }
.rcard-img .rbody { padding:22px 22px 26px; }
.rcard-img .ricon { width:44px; height:44px; border-radius:12px; }
.rcard-img h3 { margin-bottom:6px; }

/* 研究领域详情行（图 + 文 双栏） */
.rrows { display:grid; gap:34px; }
.rrow { display:grid; grid-template-columns:.9fr 1.1fr; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; box-shadow:var(--shadow-sm); }
.rrow-img { min-height:280px; }
.rrow-img img { width:100%; height:100%; object-fit:cover; display:block; }
.rrow.flip { grid-template-columns:1.1fr .9fr; }
.rrow.flip .rrow-img { order:2; }
.rrow.flip .rrow-body { order:1; }
.rrow-body { padding:30px 34px; }
.rrow-body .ricon { width:48px; height:48px; border-radius:13px; background:linear-gradient(135deg,var(--primary),var(--teal)); display:grid; place-items:center; color:#fff; margin-bottom:14px; }
.rrow-body h3 { font-size:20px; margin-bottom:10px; }
.rrow-body .rdesc { color:#33475b; font-size:14.5px; margin-bottom:14px; }
.sub-chips { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:16px; }
.chip-s { font-size:12px; font-weight:700; padding:5px 12px; border-radius:999px; background:var(--surface-2); color:var(--teal); border:1px solid var(--line); }
.rep-block { border-top:1px dashed var(--line); padding-top:14px; }
.rep-t { display:flex; align-items:center; gap:8px; font-size:13px; font-weight:800; color:var(--primary); margin-bottom:8px; }
.rep-t .ic { color:var(--teal); }
.rep-list { display:grid; gap:7px; }
.rep-list li { font-size:13px; color:var(--muted); line-height:1.65; }
.rep-list li b { color:var(--ink); font-weight:800; }
.rep-list .mp-t { color:var(--ink); }
.rep-list em { color:var(--teal); }
.rep-note { font-size:13px; color:var(--muted); margin:0; line-height:1.7; }

/* 教学理念引言 */
.quote { position:relative; background:var(--surface); border:1px solid var(--line); border-left:5px solid var(--teal); border-radius:var(--radius-sm); padding:26px 30px 22px 56px; box-shadow:var(--shadow-sm); margin-bottom:36px; }
.quote .qmark { position:absolute; left:18px; top:2px; font-size:64px; line-height:1; color:var(--teal); opacity:.3; font-family:Georgia,serif; }
.quote p { margin:0 0 8px; color:var(--ink); font-size:15.5px; }
.quote cite { display:block; text-align:right; font-style:normal; font-size:13px; color:var(--muted); font-weight:700; }

/* 课题组学生 */
.members-note { font-size:12.5px; color:var(--faint); margin:-14px 0 18px; }
.member-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
.member { background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:18px; display:flex; gap:14px; align-items:center; box-shadow:var(--shadow-sm); transition:.22s; }
.member:hover { transform:translateY(-4px); box-shadow:var(--shadow); border-color:var(--teal); }
.m-ava { width:52px; height:52px; border-radius:50%; flex:0 0 auto; display:grid; place-items:center; font-weight:800; font-size:20px; color:#fff; background:linear-gradient(135deg,var(--primary),var(--teal)); }
.m-body h4 { margin:0 0 2px; font-size:15.5px; }
.m-role { font-size:12.5px; color:var(--muted); line-height:1.5; }

/* 申请步骤 */
.steps { display:grid; gap:14px; margin:0; }
.steps li { display:flex; gap:14px; align-items:flex-start; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm); padding:16px 18px; font-size:14.5px; color:#33475b; box-shadow:var(--shadow-sm); }
.step-n { width:30px; height:30px; border-radius:50%; flex:0 0 auto; display:grid; place-items:center; background:var(--teal); color:#fff; font-weight:800; font-size:14px; }

/* 三栏获奖 */
.award-cols.three { grid-template-columns:repeat(3,1fr); }

/* 来访指南 */
.visit-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.visit-grid .cinfo span { color:var(--muted); font-size:14px; line-height:1.7; }

/* 专利行 */
.patent-row { display:flex; gap:16px; align-items:center; margin-top:30px; background:linear-gradient(135deg,var(--primary),var(--teal)); color:#fff; border-radius:var(--radius-sm); padding:20px 26px; }
.patent-row .ic { color:var(--gold); width:26px; height:26px; flex:0 0 auto; }
.patent-row strong { display:block; font-size:15px; margin-bottom:2px; }
.patent-row span { color:rgba(255,255,255,.85); font-size:13.5px; }

/* 引用复制按钮 */
.cite-btn { margin-left:auto; display:inline-flex; align-items:center; gap:6px; border:1px solid var(--line); background:var(--surface); border-radius:999px; padding:5px 12px; font-size:12px; font-weight:700; color:var(--muted); cursor:pointer; transition:.18s; font-family:inherit; }
.cite-btn:hover { border-color:var(--teal); color:var(--teal); }
.cite-btn.done { background:rgba(14,149,148,.12); color:var(--teal); border-color:var(--teal); }
.pub .tag.review { background:rgba(11,60,93,.12); color:var(--primary); }
.ftype-lbl { font-size:12.5px; color:var(--faint); font-weight:700; margin-right:2px; }

/* 首页招生 CTA 带 */
.cta-band { background:linear-gradient(120deg,var(--primary) 0%,var(--teal) 58%,var(--hero-b) 130%); color:#fff; padding:66px 0; position:relative; overflow:hidden; }
.cta-band::before { content:""; position:absolute; inset:0; background:url("../img/hero-light.webp") center/cover; opacity:.16; pointer-events:none; }
.cta-inner { position:relative; display:flex; align-items:center; justify-content:space-between; gap:30px; flex-wrap:wrap; }
.cta-inner h2 { color:#fff; font-size:clamp(22px,3vw,30px); margin:0 0 8px; }
.cta-inner p { color:rgba(255,255,255,.85); margin:0; max-width:660px; font-size:15px; }
.cta-band .btn-primary { flex:0 0 auto; }

/* 灯箱 */
.lightbox { position:fixed; inset:0; z-index:300; background:rgba(8,43,68,.92); display:grid; place-items:center; padding:5vw; }
.lightbox[hidden] { display:none; }
.lightbox img { max-width:100%; max-height:80vh; border-radius:10px; box-shadow:var(--shadow-lg); }
.lb-cap { position:absolute; bottom:6vh; left:0; right:0; text-align:center; color:rgba(255,255,255,.85); font-size:14px; }
.lb-close { position:absolute; top:22px; right:28px; width:46px; height:46px; border-radius:50%; border:1px solid rgba(255,255,255,.4); background:transparent; color:#fff; font-size:26px; cursor:pointer; line-height:1; }
.lb-close:hover { background:rgba(255,255,255,.15); }
.gitem { cursor:zoom-in; }
.gitem img { transition:transform .5s; }
.gitem:hover img { transform:scale(1.05); }

/* ---------- v2 响应式 ---------- */
@media (max-width: 980px) {
  .rrow, .rrow.flip { grid-template-columns:1fr; }
  .rrow-img, .rrow.flip .rrow-img { order:0; min-height:220px; max-height:260px; }
  .rrow.flip .rrow-body { order:1; }
  .research-grid.rgrid-img { grid-template-columns:1fr 1fr; }
  .member-grid { grid-template-columns:1fr 1fr; }
  .award-cols.three { grid-template-columns:1fr; }
  .visit-grid { grid-template-columns:1fr; }
  .cta-inner { justify-content:flex-start; }
}
@media (max-width: 720px) {
  .research-grid.rgrid-img { grid-template-columns:1fr; }
  .member-grid { grid-template-columns:1fr; }
  .rrow-body { padding:22px 20px; }
  .container.wide { max-width:none; }
}