/* ===================================================================
   Design tokens — written like a small DESIGN.md in CSS form.
   The site should feel like a precise video tool: calculator typography,
   timecode details, and the original purple-led visual language.
   =================================================================== */

:root {
  --purple-500: #6d4aff;
  --purple-400: #8a6fff;
  --purple-300: #b3a1ff;
  --accent-green: #34c98a;
  --accent-blue: #4d8dff;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', monospace;

  --rail-w: 56px;
  --max-w: 760px;
  --radius: 6px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 3rem;
  --space-5: 5rem;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

:root,
[data-theme="dark"] {
  --bg: #0a0a0d;
  --surface: #131318;
  --surface-soft: #101016;
  --border: #232229;
  --border-strong: #34323d;
  --text: #ece9f2;
  --text-muted: #837e94;
  --accent: var(--purple-400);
  --accent-2: var(--purple-300);
  --accent-3: var(--accent-blue);
}

[data-theme="light"] {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --surface-soft: #f0eef7;
  --border: #e2dfd8;
  --border-strong: #cfcabd;
  --text: #15131a;
  --text-muted: #6b6678;
  --accent: var(--purple-500);
  --accent-2: var(--purple-400);
  --accent-3: var(--accent-blue);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { overflow-x: hidden; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  padding-left: var(--rail-w);
  background-image:
    linear-gradient(90deg, color-mix(in srgb, var(--border) 42%, transparent) 1px, transparent 1px),
    linear-gradient(180deg, color-mix(in srgb, var(--border) 35%, transparent) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: calc(var(--rail-w) - 1px) 0;
  transition: background-color 0.35s var(--ease), color 0.35s var(--ease);
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ===================================================================
   簽名元素:固定在左側的時間碼軌
   =================================================================== */
.timecode-rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail-w);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: 1.5rem 0;
  gap: 0.5rem;
  z-index: 40;
  background: var(--bg);
}
.tc-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  writing-mode: vertical-rl;
}
.tc-dot {
  width: 6px; height: 6px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 45%, transparent); }
  50% { box-shadow: 0 0 0 4px transparent; }
}
.tc-clock {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  writing-mode: vertical-rl;
  letter-spacing: 0.04em;
}

/* ===================================================================
   Topbar
   =================================================================== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600; font-size: 0.9rem;
  letter-spacing: 0.04em;
}
.brand-mark { color: var(--accent); }

.topbar-actions {
  display: flex;
  gap: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.switch-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-left: 1px solid var(--border-strong);
  padding: 0.5rem 0.8rem;
  cursor: pointer;
}
.switch-btn:first-child { border-left: none; }
.switch-btn:hover { color: var(--accent); background: var(--surface-soft); }

/* ===================================================================
   Hero
   =================================================================== */
main { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--space-3); }

.hero {
  position: relative;
  padding: clamp(var(--space-4), 9vw, var(--space-5)) 0 var(--space-4);
}

/* 標尺紋理:細小刻度線,呼應剪輯軟體的時間軸尺,取代原本的漸層光暈 */
.hero-ruler {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 22px;
  background-image: repeating-linear-gradient(
    to right,
    var(--border-strong) 0, var(--border-strong) 1px,
    transparent 1px, transparent 20px
  );
  opacity: 0.7;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin: var(--space-3) 0 var(--space-2);
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.35rem);
  line-height: 1.16;
  max-width: 12ch;
}
.hero-title .accent {
  color: var(--accent);
  display: block;
  text-shadow: 0 0 18px color-mix(in srgb, var(--accent) 18%, transparent);
}

.hero-sub {
  margin-top: var(--space-2);
  max-width: 54ch;
  color: var(--text);
  font-size: 1.02rem;
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  border-left: 3px solid var(--accent);
  padding: 0.9rem 1rem;
}

.hero-actions { display: flex; gap: 0.75rem; margin-top: var(--space-3); flex-wrap: wrap; }

.btn-line {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.3rem;
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}
.btn-line:hover { border-color: var(--accent); color: var(--accent); }
.btn-fill {
  background: var(--accent);
  border-color: var(--accent);
  color: #07110d;
}
.btn-fill:hover { background: transparent; color: var(--accent); }

/* ===================================================================
   Sections
   =================================================================== */
.section {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  margin: 0 0 var(--space-3);
  font-weight: 500;
}

/* Track list — pipeline 排序有真實意義,不是裝飾編號 */
.track-list { display: flex; flex-direction: column; }

.track-row {
  display: grid;
  grid-template-columns: 2.4rem 1fr auto;
  align-items: start;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--border);
}
.track-row:first-child { border-top: none; }

.track-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  padding-top: 0.2rem;
}
.track-body h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.track-body p { color: var(--text-muted); font-size: 0.93rem; margin: 0; max-width: 56ch; }
.track-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding-top: 0.25rem;
  white-space: nowrap;
}

/* Project rows */
.project-row { padding: var(--space-3) 0; border-bottom: 1px solid var(--border); }
.project-row:last-child { border-bottom: none; }

.project-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.project-year { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted); }
.tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0.15rem 0.5rem;
}
.project-row h3 { font-size: 1.15rem; margin-bottom: 0.4rem; }
.project-row p { color: var(--text-muted); max-width: 62ch; margin: 0; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--space-4); align-items: start; }
.about p { color: var(--text-muted); max-width: 50ch; }

.link-list { display: flex; flex-direction: column; gap: 0.6rem; font-family: var(--font-mono); font-size: 0.92rem; }
.link-list .prompt { color: var(--accent); margin-right: 0.4rem; }
.link-list a { width: fit-content; border-bottom: 1px solid transparent; }
.link-list a:hover { color: var(--accent); border-color: var(--accent); }
.email-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.copy-email {
  min-width: 4.6rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.68rem;
  line-height: 1;
  padding: 0.32rem 0.5rem;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}
.copy-email:hover,
.copy-email:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}
.copy-email.is-copied {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0a0d;
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--space-4) var(--space-3) var(--space-3);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  border-top: 1px solid var(--border);
}

/* ===================================================================
   Responsive
   =================================================================== */
@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
  .track-row { grid-template-columns: 2rem 1fr; }
  .track-tag { grid-column: 2; }
}

@media (max-width: 560px) {
  :root { --rail-w: 0px; }
  .timecode-rail { display: none; }
  body { padding-left: 0; }
}