/* ============================================================
   CKfablab — Editorial Design System
   黑白編輯風：Century Gothic / 大字混合字重 / 極致留白
   ============================================================ */

:root {
  --ink: #111111;
  --paper: #ffffff;
  --gray: #8a8a8a;
  --gray-light: #e8e8e8;
  --gray-bg: #f5f5f4;
  --font-latin: "Century Gothic", "CenturyGothic", "Questrial", "Futura", "Jost", sans-serif;
  --font-tc: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font: var(--font-latin), var(--font-tc);
  --max-w: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-latin), var(--font-tc);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Language toggle ---------- */
body[data-lang="en"] .lang-zh { display: none !important; }
body[data-lang="zh"] .lang-en { display: none !important; }

/* ---------- Layout ---------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 32px; }

section { padding: 110px 0; }
section.tight { padding: 70px 0; }

/* ---------- Typography ---------- */
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 28px;
  font-weight: 400;
}

h1, h2, h3 { font-weight: 300; line-height: 1.15; }

h1.display {
  font-size: clamp(44px, 6.5vw, 88px);
  letter-spacing: -0.01em;
}
h2.display {
  font-size: clamp(32px, 4.5vw, 56px);
  margin-bottom: 24px;
}
h1 strong, h2 strong, h3 strong { font-weight: 700; }

h3 { font-size: 22px; margin-bottom: 12px; }

.lede {
  font-size: 19px;
  color: #333;
  max-width: 720px;
  font-weight: 300;
}

.small { font-size: 13px; color: var(--gray); }

.todo {
  color: var(--gray);
  font-style: italic;
  font-size: 14px;
}

a { color: inherit; text-decoration: none; }
p a, .link { border-bottom: 1px solid var(--ink); padding-bottom: 1px; }
p a:hover, .link:hover { color: var(--gray); border-color: var(--gray); }

/* ---------- Header ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ink);
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.wordmark {
  font-size: 20px;
  letter-spacing: 0.08em;
  font-weight: 700;
}
.wordmark span { font-weight: 300; color: var(--gray); }

nav.main-nav { display: flex; gap: 34px; align-items: center; }
nav.main-nav a {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
nav.main-nav a:hover, nav.main-nav a.active { border-bottom: 1px solid var(--ink); }

.lang-toggle {
  font-size: 12px;
  letter-spacing: 0.15em;
  border: 1px solid var(--ink);
  background: none;
  padding: 5px 14px;
  cursor: pointer;
  font-family: inherit;
}
.lang-toggle:hover { background: var(--ink); color: var(--paper); }

/* mobile nav */
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - 68px);
  display: flex;
  align-items: center;
  overflow: hidden;
}
#hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 32px;
  width: 100%;
  pointer-events: none;
}
.hero-content .lede { margin-top: 32px; }
.hero-scroll {
  position: absolute;
  bottom: 28px;
  left: 32px;
  z-index: 1;
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gray);
}

/* ---------- Section header row ---------- */
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}
.section-head .more {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  white-space: nowrap;
}

/* ---------- Research axes ---------- */
.axes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.axis {
  border-top: 1px solid var(--ink);
  padding-top: 28px;
}
.axis .num {
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--gray);
  display: block;
  margin-bottom: 18px;
}
.axis h3 { font-size: 20px; }
.axis p { font-size: 14.5px; color: #444; margin-top: 10px; }
.axis .tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  border: 1px solid var(--gray-light);
  padding: 3px 10px;
  color: var(--gray);
  text-transform: uppercase;
}

/* ---------- Project cards ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 40px 32px;
}
.project-card { display: block; }
.project-card .visual {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--ink);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: 16px;
  transition: background 0.25s;
  background-size: cover;
  background-position: center;
}
.project-card .visual .idx {
  font-size: 64px;
  font-weight: 700;
  color: var(--gray-light);
  line-height: 1;
  position: absolute;
  top: 14px;
  left: 16px;
}
.project-card:hover .visual { background-color: var(--gray-bg); }
/* placeholder patterns per category（換上照片後移除背景樣式即可）*/
.visual.p-ai       { background-image: repeating-linear-gradient(45deg, transparent 0 14px, #eee 14px 15px); }
.visual.p-interact { background-image: radial-gradient(circle at 70% 30%, #eee 0 2px, transparent 3px); background-size: 26px 26px; }
.visual.p-fab      { background-image: repeating-linear-gradient(0deg, transparent 0 18px, #eee 18px 19px), repeating-linear-gradient(90deg, transparent 0 18px, #eee 18px 19px); }
.visual.p-edu      { background-image: repeating-radial-gradient(circle at 50% 120%, transparent 0 22px, #eee 22px 23px); }

.project-card .meta {
  display: flex;
  gap: 14px;
  margin-top: 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray);
}
.project-card h3 { font-size: 18px; margin-top: 6px; font-weight: 700; }
.project-card .desc { font-size: 14px; color: #444; margin-top: 6px; }
.project-card .award { font-size: 12.5px; margin-top: 8px; color: var(--ink); }
.project-card .award::before { content: "★ "; }

/* ---------- Filters ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 48px; }
.filter-btn {
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--gray-light);
  padding: 8px 18px;
  cursor: pointer;
  color: var(--gray);
}
.filter-btn.active, .filter-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- News / list rows ---------- */
.row-list { border-top: 1px solid var(--ink); }
.row-item {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 24px;
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-light);
  align-items: baseline;
}
.row-item .date {
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--gray);
  text-transform: uppercase;
}
.row-item .title { font-size: 16.5px; }
.row-item .title strong { font-weight: 700; }
.row-item .cat {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray);
  white-space: nowrap;
}

/* ---------- Two-column prose ---------- */
.two-col { display: grid; grid-template-columns: 320px 1fr; gap: 64px; align-items: start; }
.two-col .sticky-side { position: sticky; top: 100px; }

/* ---------- CV / timeline ---------- */
.cv-block { margin-bottom: 56px; }
.cv-block h3 {
  font-size: 13px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gray);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 12px;
  margin-bottom: 20px;
  font-weight: 400;
}
.cv-item { display: grid; grid-template-columns: 150px 1fr; gap: 20px; padding: 8px 0; font-size: 15px; }
.cv-item .when { color: var(--gray); font-size: 13.5px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.stat { border-top: 1px solid var(--ink); padding-top: 20px; }
.stat .n { font-size: 48px; font-weight: 700; line-height: 1; }
.stat .label { font-size: 13px; color: var(--gray); margin-top: 10px; }

/* ---------- Dark section ---------- */
.dark {
  background: var(--ink);
  color: var(--paper);
}
.dark .eyebrow { color: #999; }
.dark .lede { color: #ccc; }
.dark a.link, .dark .link { border-color: var(--paper); }
.dark .link:hover { color: #999; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 14px 34px;
  margin-top: 32px;
  transition: all 0.2s;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.dark .btn { border-color: var(--paper); }
.dark .btn:hover { background: var(--paper); color: var(--ink); }

/* ---------- Footer ---------- */
footer {
  background: var(--ink);
  color: var(--paper);
  padding: 80px 0 40px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 64px; }
footer .wordmark { color: var(--paper); }
footer .wordmark span { color: #777; }
footer h4 {
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: #888;
  margin-bottom: 18px;
  font-weight: 400;
}
footer ul { list-style: none; }
footer li { font-size: 14px; padding: 4px 0; color: #ccc; }
footer li a:hover { color: var(--paper); }
.footer-bottom {
  border-top: 1px solid #333;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #777;
  letter-spacing: 0.08em;
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero { padding: 100px 0 70px; border-bottom: 1px solid var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .axes, .stats { grid-template-columns: 1fr; gap: 28px; }
  .two-col { grid-template-columns: 1fr; gap: 32px; }
  .two-col .sticky-side { position: static; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  nav.main-nav {
    display: none;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
    flex-direction: column;
    padding: 24px 32px;
    gap: 18px;
    align-items: flex-start;
  }
  nav.main-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .row-item { grid-template-columns: 1fr; gap: 4px; }
  .cv-item { grid-template-columns: 1fr; gap: 2px; }
  .cv-item .when { font-size: 12px; }
  .fact-list .row-item { grid-template-columns: 1fr; }
  .header-inner { padding: 0 20px; }
  .container { padding: 0 20px; }
  section { padding: 70px 0; }
}