/* 陳慶瀚教授個人網站 — 樣式 */
:root {
  --bg: #f8f8f6;
  --paper: #ffffff;
  --ink: #121212;
  --ink-2: #4a4a48;
  --ink-3: #8a8a86;
  --line: #e4e4df;
  --accent: #a62639;
  --accent-soft: #f6e9eb;
  --sans: Inter, "Noto Sans TC", ui-sans-serif, system-ui, sans-serif;
  --serif: "Source Serif 4", "Noto Serif TC", ui-serif, Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --wrap: 1120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--sans); color: var(--ink); background: var(--bg);
  font-size: 16px; line-height: 1.75;
  background-image:
    linear-gradient(to right, rgba(18,18,18,.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(18,18,18,.035) 1px, transparent 1px);
  background-size: 64px 64px;
}
a { color: inherit; }
img, video, iframe { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.25; margin: 0; letter-spacing: -.01em; }
p { margin: 0; }
ul, ol { list-style: none; margin: 0; padding: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- header */
.top { position: sticky; top: 0; z-index: 50; background: rgba(248,248,246,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top-in { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { font-family: var(--serif); font-size: 20px; font-weight: 600; text-decoration: none; white-space: nowrap; }
.brand span { font-family: var(--mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); margin-left: 12px; font-weight: 400; }
.main-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.main-nav button, .nav-link { font: inherit; font-size: 14px; background: none; border: 0; padding: 8px 12px; cursor: pointer; color: var(--ink-2); text-decoration: none; border-radius: 4px; }
.main-nav button::after { content: "▾"; font-size: 10px; margin-left: 6px; color: var(--ink-3); }
.main-nav button:hover, .nav-link:hover, .dd.open button { color: var(--ink); background: rgba(18,18,18,.04); }
.dd { position: relative; }
.dd-menu { display: none; position: absolute; top: calc(100% + 6px); left: 0; min-width: 210px; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 6px; box-shadow: 0 12px 32px rgba(0,0,0,.08); }
.dd.open .dd-menu { display: block; }
.dd-menu a { display: flex; justify-content: space-between; gap: 16px; padding: 8px 10px; border-radius: 4px; text-decoration: none; font-size: 14px; }
.dd-menu a:hover { background: var(--accent-soft); color: var(--accent); }
.dd-menu small { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.top-tools { display: flex; align-items: center; gap: 12px; }
.lang { display: flex; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.lang a { font-family: var(--mono); font-size: 11px; padding: 4px 10px; text-decoration: none; color: var(--ink-2); background: var(--paper); }
.lang a.on { background: var(--accent); color: #fff; }
.burger { display: none; width: 36px; height: 36px; border: 0; background: none; cursor: pointer; padding: 8px; }
.burger span { display: block; height: 1.5px; background: var(--ink); margin: 5px 0; }
.mobile-nav { display: none; }
.mobile-nav.open { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 16px; padding: 12px 24px 20px; border-top: 1px solid var(--line); }
.mobile-nav a { text-decoration: none; padding: 8px 0; font-size: 15px; border-bottom: 1px solid var(--line); }

/* ---------- sections */
section { padding: 96px 0; border-bottom: 1px solid var(--line); }
.sec-head { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; padding-left: 18px; border-left: 3px solid var(--accent); }
.sec-head h2 { font-size: 30px; }
.sec-sub, .label, .kicker, .num { font-family: var(--mono); font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink-3); }
.sec-intro { max-width: 720px; color: var(--ink-2); margin-bottom: 40px; }
.label { margin: 32px 0 14px; color: var(--accent); }
.lead { font-size: 17px; color: var(--ink-2); margin-bottom: 24px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.grid2.split { grid-template-columns: 5fr 6fr; align-items: start; }

/* ---------- hero */
.hero { padding-top: 72px; }
.hero-top { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; }
.kicker { margin-bottom: 18px; line-height: 1.8; }
.hero h1 { font-size: clamp(44px, 7vw, 76px); }
.hero-role { font-family: var(--serif); font-size: 22px; color: var(--ink-2); margin-top: 8px; }
.hero-role em { font-weight: 400; }
.dot { margin: 0 14px; color: var(--ink-3); }
.portrait { margin: 0; padding: 8px; background: var(--paper); border: 1px solid var(--line); flex-shrink: 0; }
.portrait img { width: 180px; height: 240px; object-fit: cover; object-position: 50% 30%; }
.rule { width: 120px; height: 2px; background: linear-gradient(to right, var(--accent), transparent); margin: 40px 0; }
.hero-body { display: grid; grid-template-columns: 3fr 2fr; gap: 48px; }
.bio { font-size: 17px; line-height: 1.95; }
.tags { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-bottom: 28px; }
.tags li { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-2); }
.tags li::before { content: "/ "; color: var(--accent); }
.btns { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.btn { display: inline-flex; align-items: center; gap: 8px; font: inherit; font-size: 14px; padding: 10px 18px; border-radius: 3px; text-decoration: none; cursor: pointer; border: 1px solid transparent; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #8b1f30; }
.btn-ghost { background: var(--paper); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin: 56px 0 0; border-top: 1px solid var(--line); }
.stats div { padding: 24px 16px 0 0; }
.stats dt { font-family: var(--serif); font-size: 40px; color: var(--accent); line-height: 1.1; }
.stats dd { margin: 6px 0 0; font-size: 13px; color: var(--ink-2); }
#theses .stats { margin: 0 0 40px; }

/* ---------- timeline lists */
.tl li { display: grid; grid-template-columns: 150px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.tl-date, .row-date, .pub-y, .ms-y { font-family: var(--mono); font-size: 12px; color: var(--ink-3); padding-top: 3px; }
.tl-t { font-weight: 500; }
.tl-s { font-size: 14px; color: var(--ink-2); }
.expertise ul { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.expertise li { background: var(--paper); border: 1px solid var(--line); padding: 18px; }
.expertise strong { display: block; font-weight: 600; }
.expertise span { font-size: 14px; color: var(--ink-2); }

/* ---------- cards */
.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 32px; }
.card { background: var(--paper); padding: 28px; }
.card .num { color: var(--accent); display: block; margin-bottom: 18px; }
.card h3 { font-size: 21px; }
.card-sub { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); margin: 4px 0 14px; }
.card p:last-child { font-size: 15px; color: var(--ink-2); }

.rows li { display: grid; grid-template-columns: 120px 1fr auto; gap: 20px; align-items: baseline; padding: 16px 0; border-bottom: 1px solid var(--line); }
.badge { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; padding: 2px 8px; border: 1px solid var(--accent); color: var(--accent); border-radius: 2px; white-space: nowrap; }

.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tile { background: var(--paper); border: 1px solid var(--line); padding: 20px; display: flex; flex-direction: column; justify-content: space-between; gap: 16px; }
.tile-t { font-weight: 500; line-height: 1.6; }
.tile-m { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--ink-2); border-top: 1px solid var(--line); padding-top: 10px; }
.tile-m span:last-child { font-family: var(--mono); font-size: 11px; color: var(--ink-3); white-space: nowrap; }

/* ---------- publications */
.scholar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; background: var(--paper); border: 1px solid var(--line); padding: 16px 20px; }
.scholar p { font-family: var(--mono); font-size: 13px; }
.pubs li { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.pub-t { font-family: var(--serif); font-size: 18px; line-height: 1.45; }
.pub-a { font-size: 14px; color: var(--ink-2); margin-top: 4px; }
.pub-v { font-size: 13px; color: var(--ink-3); font-style: italic; }
.dl { display: inline-block; margin-top: 8px; font-size: 13px; color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
.dl:hover { border-color: var(--accent); }

/* ---------- theses accordion */
.acc details { background: var(--paper); border: 1px solid var(--line); margin-bottom: 12px; }
.acc summary { list-style: none; display: flex; align-items: center; gap: 20px; padding: 22px 24px; cursor: pointer; }
.acc summary::-webkit-details-marker { display: none; }
.acc summary > div { flex: 1; }
.acc h3 { font-size: 20px; }
.acc .card-sub { margin: 2px 0 6px; }
.acc-d { font-size: 14px; color: var(--ink-2); }
.acc-n { font-family: var(--mono); font-size: 12px; color: var(--accent); white-space: nowrap; }
.acc-i { width: 28px; height: 28px; border: 1px solid var(--line); border-radius: 50%; position: relative; flex-shrink: 0; }
.acc-i::before, .acc-i::after { content: ""; position: absolute; left: 50%; top: 50%; width: 10px; height: 1.5px; background: var(--ink); transform: translate(-50%, -50%); }
.acc-i::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .2s; }
.acc details[open] .acc-i::after { transform: translate(-50%, -50%) rotate(0); }
.acc ul { padding: 0 24px 18px; }
.acc li { display: grid; grid-template-columns: 60px 1fr; gap: 12px; padding: 8px 0; border-top: 1px solid var(--line); font-size: 15px; }
.acc li span { font-family: var(--mono); font-size: 12px; color: var(--ink-3); padding-top: 2px; }

/* ---------- demos */
.demos { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.demo { background: var(--paper); border: 1px solid var(--line); }
.media { aspect-ratio: 16 / 9; background: #111; }
.media video, .media iframe { width: 100%; height: 100%; border: 0; object-fit: contain; }
.demo-b { padding: 18px 20px 22px; }
.demo-b .label { margin: 0 0 6px; }
.demo-b h3 { font-size: 18px; }
.demo-b p:last-child:not(.label) { font-size: 14px; color: var(--ink-2); margin-top: 8px; }

/* ---------- join / panels */
.tracks li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.tracks li p:last-child { font-size: 15px; color: var(--ink-2); }
.panel { background: var(--paper); border: 1px solid var(--line); padding: 28px; }
.panel .label { margin-top: 0; }
.steps li { display: grid; grid-template-columns: 40px 1fr; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.steps li:last-child { border: 0; }
.steps .num { color: var(--accent); padding-top: 4px; }
.steps p:last-child { font-size: 14px; color: var(--ink-2); }
article.panel h3 { font-size: 24px; margin: 4px 0 14px; }
article.panel > p { color: var(--ink-2); font-size: 15px; }
.checks { margin: 20px 0 24px; }
.checks li { padding: 6px 0 6px 22px; position: relative; font-size: 15px; }
.checks li::before { content: ""; position: absolute; left: 0; top: 15px; width: 10px; height: 2px; background: var(--accent); }

/* ---------- teaching / literature */
.courses { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
.courses li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.courses small { font-family: var(--mono); font-size: 11px; color: var(--ink-3); letter-spacing: .04em; }
.books li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.books li p:last-child:not(.pub-y) { font-size: 14px; color: var(--ink-2); }
#literature .tl li { grid-template-columns: 70px 1fr; }

.milestones { position: relative; margin-left: 8px; border-left: 1px solid var(--line); }
.milestones li { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 14px 0 14px 28px; position: relative; }
.milestones li::before { content: ""; position: absolute; left: -5px; top: 22px; width: 9px; height: 9px; border-radius: 50%; background: var(--bg); border: 2px solid var(--accent); }
.ms-y { color: var(--accent); font-size: 13px; }

/* ---------- contact */
.contact-list { margin-bottom: 24px; }
.contact-list li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.profiles { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.profiles a { display: block; background: var(--paper); border: 1px solid var(--line); padding: 12px 16px; text-decoration: none; }
.profiles a:hover { border-color: var(--accent); }
.profiles span { display: block; font-weight: 500; }
.profiles small { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
#contact .label { margin-top: 0; }

/* ---------- footer */
.foot { background: var(--ink); color: #d8d8d4; padding: 64px 0 32px; }
.foot-grid { display: grid; grid-template-columns: 2fr 3fr 2fr; gap: 40px; }
.foot-name { font-family: var(--serif); font-size: 26px; color: #fff; }
.foot-en { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: #8a8a86; margin-bottom: 14px; }
.foot-role { font-size: 14px; }
.foot .label { margin-top: 0; color: #c9606f; }
.foot nav ul { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px 16px; }
.foot a { text-decoration: none; font-size: 14px; }
.foot a:hover { color: #fff; text-decoration: underline; }
.foot li { font-size: 14px; }
.copy { margin-top: 48px; padding-top: 20px; border-top: 1px solid #2c2c2a; font-size: 12px; color: #8a8a86; }

.toast { position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); background: var(--ink); color: #fff; padding: 10px 18px; border-radius: 4px; font-size: 14px; opacity: 0; pointer-events: none; transition: .25s; z-index: 99; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- responsive */
@media (max-width: 960px) {
  .main-nav { display: none; }
  .burger { display: block; }
  .top-tools { margin-left: auto; }
  .cards3, .tiles, .demos { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .foot-grid > div:first-child { grid-column: 1 / -1; }
}
@media (max-width: 720px) {
  section { padding: 64px 0; }
  .brand span { display: none; }
  .hero-top { flex-direction: column-reverse; align-items: flex-start; }
  .portrait img { width: 120px; height: 160px; }
  .hero-body, .grid2, .grid2.split { grid-template-columns: 1fr; gap: 32px; }
  .cards3, .tiles, .demos, .expertise ul, .profiles, .courses { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .tl li, .pubs li, .milestones li { grid-template-columns: 1fr; gap: 2px; }
  .rows li { grid-template-columns: 1fr; gap: 4px; }
  .rows .badge { justify-self: start; }
  .foot-grid { grid-template-columns: 1fr; }
  .acc summary { padding: 18px; gap: 12px; }
  .acc-n { display: none; }
}
@media print {
  .top, .toast { display: none; }
  body { background: #fff; }
  section { padding: 32px 0; }
}