/* ===== 顏色與字型:改這裡就能換整站風格 ===== */
:root {
  --accent: #1f4e79;        /* 主色(導覽、標題底線、連結) */
  --accent-soft: #e8eff6;   /* 主色淡色背景 */
  --text: #222;
  --muted: #666;
  --line: #e2e2e2;
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --max: 1080px;
  --serif: "Noto Serif TC", "Source Han Serif TC", Georgia, serif;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ===== 頁首 ===== */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky; top: 0; z-index: 10;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px; gap: 16px;
}
.brand { color: var(--text); line-height: 1.3; }
.brand:hover { text-decoration: none; }
.brand-name { font-family: var(--serif); font-size: 1.3rem; font-weight: 700; display: block; }
.brand-sub { font-size: .8rem; color: var(--muted); letter-spacing: .05em; }

.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  color: var(--text); padding: 8px 12px; font-size: .95rem; border-radius: 4px;
}
.nav a:hover { background: var(--accent-soft); text-decoration: none; }
.nav a.active { color: var(--accent); font-weight: 700; box-shadow: inset 0 -2px 0 var(--accent); border-radius: 0; }

.menu-btn {
  display: none; background: none; border: 1px solid var(--line);
  border-radius: 4px; padding: 6px 10px; font-size: 1.1rem; cursor: pointer;
}

@media (max-width: 820px) {
  .menu-btn { display: block; }
  .nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 8px 20px 16px;
  }
  .nav.open { display: flex; }
  .nav a.active { box-shadow: inset 3px 0 0 var(--accent); }
}

/* ===== 頁面標題列 ===== */
.page-title {
  background: var(--bg-alt); border-bottom: 1px solid var(--line);
  padding: 40px 0 32px;
}
.page-title h1 { font-family: var(--serif); margin: 0; font-size: 2rem; }
.page-title p { margin: 6px 0 0; color: var(--muted); }

/* ===== 區塊 ===== */
section { padding: 48px 0; }
h2 {
  font-family: var(--serif); font-size: 1.5rem; margin: 0 0 20px;
  padding-bottom: 8px; border-bottom: 2px solid var(--accent); display: inline-block;
}
h3 { font-family: var(--serif); font-size: 1.15rem; margin: 0 0 8px; }

/* 首頁:左文右圖 */
.intro { display: grid; grid-template-columns: 3fr 2fr; gap: 40px; align-items: start; }
.intro .lead { font-size: 1.1rem; }
@media (max-width: 820px) { .intro { grid-template-columns: 1fr; } }

/* 圖片占位(換成真圖片時,直接把 <div class="ph"> 換成 <img>) */
.ph {
  background: linear-gradient(135deg, #dfe8f1, #c9d8e6);
  color: #4a6a88; display: flex; align-items: center; justify-content: center;
  font-size: .9rem; aspect-ratio: 4 / 3; border-radius: 4px; text-align: center; padding: 12px;
}
.ph.square { aspect-ratio: 1 / 1; }
.photo { width: 100%; border-radius: 4px; object-fit: cover; }

/* 教授卡片 */
.pi-card {
  display: grid; grid-template-columns: 140px 1fr; gap: 24px;
  background: var(--bg-alt); padding: 24px; border-radius: 6px; border: 1px solid var(--line);
}
.pi-card .ph, .pi-card img { aspect-ratio: 1/1; border-radius: 50%; }
@media (max-width: 560px) { .pi-card { grid-template-columns: 1fr; } .pi-card .ph, .pi-card img { width: 120px; } }

/* 消息列表 */
.news-list { list-style: none; padding: 0; margin: 0; }
.news-list li { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.news-list time { color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; }
.tag { display: inline-block; font-size: .75rem; background: var(--accent-soft); color: var(--accent); padding: 0 8px; border-radius: 3px; margin-right: 6px; }
@media (max-width: 560px) { .news-list li { grid-template-columns: 1fr; gap: 2px; } }

/* 研究主題 */
.topic { display: grid; grid-template-columns: 2fr 3fr; gap: 32px; padding: 32px 0; border-bottom: 1px solid var(--line); }
.topic:last-child { border-bottom: 0; }
@media (max-width: 820px) { .topic { grid-template-columns: 1fr; } }

/* 成員 */
.members { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 24px; }
.member { text-align: center; }
.member .ph, .member img { aspect-ratio: 1/1; border-radius: 50%; width: 140px; margin: 0 auto 12px; object-fit: cover; }
.member .name { font-weight: 700; }
.member .role { color: var(--muted); font-size: .9rem; }
.member .topic-line { font-size: .85rem; }
.alumni { columns: 2; padding-left: 20px; }
@media (max-width: 560px) { .alumni { columns: 1; } }

/* 論文 */
.year { margin-top: 32px; }
.year h3 { color: var(--accent); }
.pubs { padding-left: 20px; }
.pubs li { margin-bottom: 14px; }
.pubs .title { font-weight: 700; }
.pubs .venue { font-style: italic; }
.pubs .me { text-decoration: underline; }

/* 按鈕與提示框 */
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 10px 20px; border-radius: 4px; }
.btn:hover { text-decoration: none; opacity: .9; }
.callout { background: var(--accent-soft); border-left: 4px solid var(--accent); padding: 20px 24px; border-radius: 0 6px 6px 0; }

/* ===== 頁尾 ===== */
.site-footer { background: #23272b; color: #ccc; padding: 32px 0; font-size: .9rem; margin-top: 24px; }
.site-footer a { color: #fff; }
.site-footer .container { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }

/* ===== 首頁大圖(換成實驗室照片:替換 images/hero.jpg) ===== */
.hero { position: relative; padding: 0; height: 420px; overflow: hidden; background: #0e2a44; }
.hero img { width: 100%; height: 100%; object-fit: cover; opacity: .4; }
.hero-text { position: absolute; inset: auto 0 0 0; padding: 40px 0; background: linear-gradient(transparent, rgba(8,24,40,.85)); color: #fff; }
.hero h1 { font-family: var(--serif); font-size: 2rem; line-height: 1.4; margin: 0; max-width: 760px; }
.eyebrow { text-transform: uppercase; letter-spacing: .15em; font-size: .8rem; margin: 0 0 8px; opacity: .85; }
@media (max-width: 560px) { .hero { height: 340px; } .hero h1 { font-size: 1.4rem; } }

/* 研究頁圖片 */
.fig-stack { display: grid; gap: 20px; }
figure { margin: 0; }
figcaption { font-size: .85rem; color: var(--muted); margin-top: 6px; }
.photo { border: 1px solid var(--line); background: #fff; }
.role { color: var(--muted); }
.fig-stack img { max-height: 460px; object-fit: contain; }

/* 首頁橫幅(banner.jpg)與單欄介紹 */
.hero { height: 480px; }
.hero img { opacity: 1; object-position: 35% center; }
.hero-text { background: linear-gradient(transparent, rgba(5,25,45,.8)); }
.hero h1 { text-shadow: 0 2px 12px rgba(0,0,0,.4); }
.about { max-width: 760px; }
@media (max-width: 560px) { .hero { height: 360px; } }
.pubs li::marker { color: var(--accent); font-weight: 700; }