/* ─────────────────────────────────────────────────────────────
   首頁元件樣式 —— 中文版 / 與英文版 /en/ 共用。
   設計 token（顏色、字型）在 tokens.css，不要在這裡寫死色碼。
   ───────────────────────────────────────────────────────────── */


*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.85;letter-spacing:.015em;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
/* 黑體標題字距略收，大字級才不會鬆散 */
h1,h2,h3,h4{letter-spacing:.01em}
img{max-width:100%}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- nav ---------- */
nav{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
nav .wrap{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink);letter-spacing:.02em}
.brand:hover{text-decoration:none}
.brand .logo{width:28px;height:28px;flex:none}
.brand .mark{
  font-family:var(--display);font-size:1.24rem;letter-spacing:.16em;
  background:linear-gradient(135deg,var(--blue-deep),var(--teal-bright));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.brand .sub{font-size:.82rem;font-weight:600;color:var(--muted)}
nav ul{margin-left:auto;display:flex;gap:26px;list-style:none;padding:0}
nav ul a{color:var(--ink-soft);font-size:.92rem;font-weight:500}
nav ul a:hover{color:var(--blue);text-decoration:none}
.nav-toggle{display:none}

nav ul li.lang a{
  border:1px solid var(--line);border-radius:999px;padding:5px 13px;
  font-size:.8rem;font-weight:700;letter-spacing:.06em;color:var(--muted);
}
nav ul li.lang a:hover{color:var(--blue);border-color:var(--blue)}

/* ---------- hero ---------- */
header.hero{
  background:linear-gradient(140deg,var(--blue-deep) 0%,#155e75 48%,var(--teal) 100%);
  color:#fff;padding:92px 0 84px;position:relative;overflow:hidden;
}
header.hero::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(900px 400px at 78% -10%,rgba(255,255,255,.16),transparent 60%);
  pointer-events:none;
}
.hero .wrap{position:relative;z-index:1}
.hero .eyebrow{
  font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(255,255,255,.72);margin:0 0 18px;font-weight:600;
}
.hero h1{
  font-family:var(--display);font-weight:900;
  font-size:clamp(2.1rem,5.2vw,3.4rem);line-height:1.25;margin:0 0 6px;
  letter-spacing:.005em;
}
.hero .en{
  font-size:clamp(.98rem,2.2vw,1.18rem);color:rgba(255,255,255,.8);
  letter-spacing:.05em;margin:0 0 30px;font-weight:500;
}
.hero .tagline{
  font-size:clamp(1.05rem,2.4vw,1.3rem);line-height:1.8;
  max-width:38ch;margin:0 0 12px;color:#fff;
}
.hero .tagline-en{
  font-size:.95rem;line-height:1.7;max-width:56ch;
  color:rgba(255,255,255,.7);margin:0 0 36px;font-style:italic;
}
.hero .affil{
  display:inline-flex;flex-wrap:wrap;gap:10px;align-items:center;
  font-size:.9rem;color:rgba(255,255,255,.85);
  border-top:1px solid rgba(255,255,255,.22);padding-top:20px;
}
.hero .affil span:not(:last-child)::after{content:"　·";color:rgba(255,255,255,.4)}

/* ---------- sections ---------- */
section{padding:76px 0;border-bottom:1px solid var(--line)}
section.alt{background:var(--bg-alt)}
.sec-head{margin-bottom:38px}
.sec-head .kicker{
  font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--teal);font-weight:700;margin:0 0 8px;
}
.sec-head h2{
  font-family:var(--display);font-size:clamp(1.5rem,3.4vw,2rem);
  margin:0;letter-spacing:.015em;font-weight:700;
}
.sec-head .lead{
  margin:14px 0 0;color:var(--ink-soft);max-width:62ch;font-size:1.02rem;
}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:1.25fr .95fr;gap:44px;align-items:start}
.about-body p{margin:0 0 18px;color:var(--ink-soft)}
.about-body p:last-child{margin-bottom:0}
.about-body strong{color:var(--ink)}

.pi-card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:26px;box-shadow:var(--shadow);
}
.pi-top{display:flex;gap:16px;align-items:center;margin-bottom:20px}
.avatar{
  width:62px;height:62px;border-radius:50%;flex:none;
  display:grid;place-items:center;color:#fff;font-weight:700;font-size:1.25rem;
  font-family:var(--display);letter-spacing:.02em;
  background:linear-gradient(135deg,var(--blue-deep),var(--teal-bright));
}
.pi-name{font-size:1.15rem;font-weight:700;margin:0;line-height:1.4}
.pi-name .en{display:block;font-size:.85rem;color:var(--muted);font-weight:500;letter-spacing:.03em}
.pi-role{font-size:.9rem;color:var(--teal);font-weight:600;margin:4px 0 0}
.pi-list{list-style:none;margin:0;padding:0;font-size:.92rem}
.pi-list li{display:flex;gap:12px;padding:9px 0;border-top:1px solid var(--line)}
.pi-list li span:first-child{color:var(--muted);flex:none;width:4.5em;font-weight:600}
/* 英文標籤（Education／Experience／Expertise）比中文的兩字標籤長，
   需要更寬的欄位；用修飾類別，不影響中文版。 */
.pi-list.wide li span:first-child{width:7.4em}
.cinfo.wide .lbl{width:5.6em}
.pi-list li span:last-child{color:var(--ink-soft)}
.keywords{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}
/* ---------- 研究軌跡 ---------- */
.track{margin-top:46px;padding-top:34px;border-top:1px solid var(--line)}
.track h3{font-size:1.05rem;margin:0 0 8px;font-weight:700}
.track .track-lead{margin:0 0 28px;color:var(--ink-soft);font-size:.95rem;max-width:62ch}
.track-steps{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:repeat(5,1fr);gap:22px;
}
.track-steps li{position:relative;padding-top:20px}
.track-steps li::before{
  content:"";position:absolute;left:0;right:-22px;top:5px;height:2px;
  background:linear-gradient(90deg,var(--blue),var(--teal-bright));opacity:.3;
}
.track-steps li:last-child::before{right:0}
.track-steps li::after{
  content:"";position:absolute;left:0;top:0;width:12px;height:12px;border-radius:50%;
  background:linear-gradient(135deg,var(--blue-deep),var(--teal-bright));
}
.track-steps .yr{
  display:block;font-size:.72rem;letter-spacing:.1em;color:var(--teal);
  font-weight:700;margin-bottom:5px;
}
.track-steps .ttl{display:block;font-size:.95rem;font-weight:700;color:var(--ink);line-height:1.6}

.kw{
  font-size:.78rem;padding:4px 11px;border-radius:999px;
  background:var(--tint-mint);color:var(--teal);font-weight:600;
  border:1px solid color-mix(in srgb,var(--teal) 18%,transparent);
}

/* ---------- research ---------- */
.research-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.rcard{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:28px;box-shadow:var(--shadow);position:relative;overflow:hidden;
  transition:transform .18s ease, box-shadow .18s ease;
}
.rcard:hover{transform:translateY(-2px);box-shadow:0 4px 8px rgba(16,24,40,.06),0 14px 36px rgba(16,24,40,.10)}
.rcard::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:linear-gradient(180deg,var(--blue),var(--teal-bright));
}
.rnum{
  font-family:var(--display);font-size:.8rem;font-weight:700;letter-spacing:.14em;
  color:var(--teal);margin:0 0 10px;
}
.rcard h3{font-size:1.12rem;margin:0 0 6px;line-height:1.5;font-weight:700}
.rcard .h3en{font-size:.82rem;color:var(--muted);margin:0 0 14px;letter-spacing:.02em}
.rcard p{margin:0;font-size:.95rem;color:var(--ink-soft);line-height:1.8}

/* ---------- members ---------- */
.member-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.mcard{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:22px;display:flex;gap:14px;align-items:center;
}
.mcard .avatar{width:46px;height:46px;font-size:1rem}
.mcard .avatar.ghost{
  background:var(--tint-blue);color:var(--blue);
  border:1px dashed color-mix(in srgb,var(--blue) 35%,transparent);
}
.mcard h4{margin:0;font-size:1rem;font-weight:700}
.mcard p{margin:2px 0 0;font-size:.86rem;color:var(--muted)}

/* ---------- publications ---------- */
.pub-group{margin-bottom:40px}
.pub-group:last-child{margin-bottom:0}
.pub-group h3{
  font-size:1rem;font-weight:700;margin:0 0 18px;padding-bottom:10px;
  border-bottom:2px solid var(--line);display:flex;align-items:baseline;gap:10px;
}
.pub-group h3 .count{
  font-size:.78rem;color:var(--muted);font-weight:600;
  background:var(--bg-alt);padding:2px 9px;border-radius:999px;
}
ol.pubs{list-style:none;counter-reset:p;margin:0;padding:0}
ol.pubs li{
  counter-increment:p;position:relative;
  padding:16px 0 16px 46px;border-bottom:1px solid var(--line);
  font-size:.93rem;line-height:1.75;color:var(--ink-soft);
}
ol.pubs li:last-child{border-bottom:none}
ol.pubs li::before{
  content:counter(p);position:absolute;left:0;top:16px;
  width:28px;height:28px;border-radius:7px;display:grid;place-items:center;
  background:var(--bg-alt);border:1px solid var(--line);
  font-size:.76rem;font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums;
}
ol.pubs .me{color:var(--ink);font-weight:700}
ol.pubs .jrn{font-style:italic;color:var(--ink)}
ol.pubs .yr{
  display:inline-block;font-size:.76rem;font-weight:700;color:var(--teal);
  background:var(--tint-mint);padding:1px 8px;border-radius:5px;margin-right:8px;
  font-variant-numeric:tabular-nums;
}
ol.pubs .doi{font-size:.84rem;color:var(--muted)}
.pub-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.chip{
  display:inline-flex;align-items:center;gap:7px;
  font-size:.86rem;font-weight:600;padding:8px 15px;border-radius:9px;
  border:1px solid var(--line);background:var(--card);color:var(--ink-soft);
}
.chip:hover{border-color:var(--teal);color:var(--teal);text-decoration:none}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px}
.cinfo{list-style:none;margin:0;padding:0}
.cinfo li{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.cinfo li:first-child{padding-top:0}
.cinfo .lbl{
  flex:none;width:5.5em;font-size:.78rem;font-weight:700;color:var(--teal);
  letter-spacing:.08em;text-transform:uppercase;padding-top:3px;
}
.cinfo .val{color:var(--ink-soft)}
.cinfo .val strong{color:var(--ink);font-weight:600}
.eml noscript{color:var(--muted);font-size:.92rem}
.copy{
  margin-left:10px;font:inherit;font-size:.74rem;font-weight:600;
  padding:3px 10px;border-radius:6px;cursor:pointer;vertical-align:1px;
  border:1px solid var(--line);background:var(--card);color:var(--muted);
}
.copy:hover{border-color:var(--teal);color:var(--teal)}
.copy.done{border-color:var(--teal);color:var(--teal)}
.join{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:28px;box-shadow:var(--shadow);
}
.join h3{margin:0 0 12px;font-size:1.08rem;font-weight:700}
.join p{margin:0 0 16px;font-size:.94rem;color:var(--ink-soft)}
.join ul{margin:0;padding-left:20px;font-size:.92rem;color:var(--ink-soft)}
.join li{margin-bottom:7px}

/* ---------- footer ---------- */
footer{padding:36px 0;background:var(--bg-alt);border-top:1px solid var(--line)}
footer .wrap{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between}
footer p{margin:0;font-size:.86rem;color:var(--muted)}

/* ---------- responsive ---------- */
@media (max-width:880px){
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:32px}
  .research-grid{grid-template-columns:1fr}
  .member-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  /* 五欄在此寬度已不足 110px，改為直向堆疊 */
  .track-steps{grid-template-columns:1fr;gap:18px}
  .track-steps li::before{right:0}
  nav ul{display:none}
  nav ul.open{
    display:flex;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;gap:0;background:var(--bg);
    border-bottom:1px solid var(--line);padding:8px 24px 16px;
  }
  nav ul.open li a{display:block;padding:11px 0}
  .nav-toggle{
    display:block;margin-left:auto;background:none;border:1px solid var(--line);
    border-radius:8px;padding:7px 11px;color:var(--ink);cursor:pointer;font-size:1rem;
  }
  header.hero{padding:64px 0 56px}
  /* 換行時分隔點會吊在行尾，手機版改以間距分隔 */
  .hero .affil{gap:4px 16px}
  .hero .affil span:not(:last-child)::after{content:""}
  section{padding:56px 0}
  .member-grid{grid-template-columns:1fr}
  .brand .sub{display:none}
}