/* =====================================================
   葉承均 Yeh Cheng Chun · Personal Site
   Design system v2 — dark, editorial, gradient accents
   ===================================================== */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; scroll-behavior: smooth; }
[id] { scroll-margin-top: 88px; }
body { margin: 0; min-height: 100vh; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; margin: 0; }

/* ---------- Tokens ---------- */
:root {
  /* Surfaces */
  --bg: #0a0a0c;
  --bg-soft: #101014;
  --surface: #14141b;
  --surface-2: #1a1a23;
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.16);

  /* Text */
  --text: #f5f5f7;
  --text-muted: #a1a1ab;
  --text-soft: #6c6c78;

  /* Accent gradient */
  --accent-1: #fb923c;   /* warm orange */
  --accent-2: #ec4899;   /* pink */
  --accent-3: #8b5cf6;   /* violet */
  --accent-glow: rgba(251,146,60,0.18);

  --gradient: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  --gradient-soft: linear-gradient(135deg, rgba(251,146,60,0.10) 0%, rgba(236,72,153,0.10) 50%, rgba(139,92,246,0.10) 100%);

  /* Fonts */
  --font-sans: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Microsoft JhengHei', sans-serif;
  --font-display: 'Inter', 'Noto Sans TC', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, monospace;

  /* Layout */
  --container: 1180px;
  --container-narrow: 760px;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 250ms var(--ease);
}

/* ---------- Base ---------- */
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

/* Subtle noise/grain texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' /%3E%3C/svg%3E");
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 2;
}
.container.narrow { max-width: var(--container-narrow); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--text);
}
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.25rem; font-weight: 600; }
p { margin: 0 0 1em; color: var(--text-muted); }
strong { color: var(--text); font-weight: 600; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent-1);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-1);
}

.lead {
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 640px;
}

.gradient-text {
  background: var(--gradient);
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: gradient-flow 9s ease-in-out infinite;
}
@keyframes gradient-flow {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

.text-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text);
  font-weight: 500;
  position: relative;
  transition: gap var(--transition), color var(--transition);
}
.text-link::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.text-link:hover { gap: 10px; }
.text-link:hover::after { transform: scaleX(1); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(10,10,12,0.7);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}
.site-header.is-scrolled {
  background: rgba(10,10,12,0.88);
  border-bottom-color: rgba(255,255,255,0.04);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}
.site-header.is-scrolled .header-inner { transform: scale(0.92); }
.brand {
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  display: flex; align-items: center; gap: 10px;
}
.brand::before {
  content: '';
  width: 8px; height: 8px;
  background: var(--gradient);
  border-radius: 2px;
  transform: rotate(45deg);
}

.nav-list {
  display: flex; gap: 6px;
  align-items: center;
}
.nav-list a {
  font-size: 0.875rem; font-weight: 500;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 999px;
  transition: color var(--transition), background var(--transition);
}
.nav-list a:hover { color: var(--text); background: var(--surface); }
.nav-list a.active {
  color: var(--text);
  background: var(--surface);
}

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
}
.hamburger,
.hamburger::before,
.hamburger::after {
  display: block; width: 18px; height: 1.5px;
  background: var(--text);
  position: relative;
  transition: transform var(--transition), background var(--transition);
}
.hamburger::before, .hamburger::after { content: ''; position: absolute; left: 0; }
.hamburger::before { top: -5px; }
.hamburger::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after { transform: translateY(-5px) rotate(-45deg); }

main { padding-top: 72px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(80px, 12vh, 140px) 0 clamp(60px, 10vh, 100px);
  overflow: hidden;
  --mx: 50%;
  --my: 40%;
}
.cursor-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(circle 480px at var(--mx) var(--my),
              rgba(251,146,60,0.18) 0%,
              rgba(236,72,153,0.10) 30%,
              transparent 60%);
  opacity: 0;
  transition: opacity 400ms var(--ease);
}
.hero:hover .cursor-glow,
.hero.is-hovering .cursor-glow { opacity: 1; }
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}
.hero::before {
  top: -200px; right: -150px;
  background: radial-gradient(circle, var(--accent-1) 0%, transparent 70%);
  transform: translate(var(--blob-x, 0px), var(--blob-y, 0px));
  transition: transform 700ms var(--ease);
}
.hero::after {
  bottom: -250px; left: -200px;
  background: radial-gradient(circle, var(--accent-3) 0%, transparent 70%);
  transform: translate(calc(var(--blob-x, 0px) * -0.6), calc(var(--blob-y, 0px) * -0.6));
  transition: transform 700ms var(--ease);
}
.hero .container { position: relative; z-index: 2; }
.hero-eyebrow { margin-bottom: 28px; }
.hero-title {
  margin: 0 0 28px;
  font-size: clamp(2.75rem, 8vw, 6.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.98;
  max-width: 1000px;
}
.hero-title .gradient-text { display: inline-block; }
.hero-lead {
  font-size: clamp(1.0625rem, 1.4vw, 1.25rem);
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 40px;
  line-height: 1.7;
}
.hero-actions {
  display: flex; gap: 12px; flex-wrap: wrap;
}

/* Stats row in hero */
.stats {
  margin-top: clamp(60px, 8vh, 96px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat {
  background: var(--bg);
  padding: 32px 24px;
  transition: background var(--transition);
}
.stat:hover { background: var(--surface); }
.stat-value {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 8px;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 0.9375rem; font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 0;
}
.btn-primary > * { position: relative; z-index: 1; }
.btn-primary:hover { color: var(--text); transform: translateY(-1px); }
.btn-primary:hover::before { opacity: 1; }

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

/* ---------- Page Hero ---------- */
.page-hero {
  position: relative;
  padding: clamp(72px, 10vh, 120px) 0 clamp(48px, 6vh, 80px);
  border-bottom: 1px solid var(--border);
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
  filter: blur(100px);
  opacity: 0.2;
  pointer-events: none;
  z-index: 0;
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero .eyebrow { margin-bottom: 24px; }
.page-hero h1 { margin-bottom: 16px; }

/* ---------- Sections ---------- */
.section {
  padding: clamp(64px, 10vh, 120px) 0;
  position: relative;
}
.section-header {
  display: flex; align-items: end; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  margin-bottom: 56px;
}
.section-header h2 { margin: 0; }
.section-header p { margin: 8px 0 0; max-width: 520px; }

/* ---------- Cards / Grid ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex; flex-direction: column;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
}
.card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }

.card-lg { padding: 40px; }
.card-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem; font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 0 0 20px;
}
.card-title { margin: 0 0 4px; font-size: 1.375rem; }
.card-subtitle {
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
  padding-left: 12px;
  border-left: 2px solid;
  border-image: linear-gradient(180deg, var(--accent-1), var(--accent-2)) 1;
}
.card-desc { color: var(--text-muted); margin: 0 0 24px; flex: 1; line-height: 1.7; }
.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 500; font-size: 0.9375rem;
  color: var(--text);
  transition: gap var(--transition), color var(--transition);
}
.card-link:hover { gap: 10px; color: var(--accent-1); }

.card-meta {
  margin: 24px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-muted);
}
.card-meta li {
  display: flex; gap: 12px;
  padding: 6px 0;
}
.card-meta li::before {
  content: '·';
  color: var(--accent-1);
  font-weight: 700;
}
.card-meta a { color: var(--text); border-bottom: 1px solid var(--border); }
.card-meta a:hover { border-bottom-color: var(--accent-1); }

/* ---------- Bullet list ---------- */
.bullet-list {
  margin: 0 0 1.5em;
}
.bullet-list li {
  position: relative;
  padding: 4px 0 4px 24px;
  color: var(--text-muted);
  line-height: 1.7;
}
.bullet-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 14px;
  width: 8px; height: 1px;
  background: var(--accent-1);
}
.bullet-list li strong { color: var(--text); }

/* ---------- Tags ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 2em; }
.tag {
  font-size: 0.8125rem;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.tag:hover {
  border-color: var(--accent-1);
  color: var(--text);
}

/* ---------- Awards ---------- */
.sub-h {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin: 3em 0 1.25em;
}
.sub-h::before {
  content: '';
  width: 24px; height: 1px;
  background: linear-gradient(90deg, var(--accent-1), transparent);
}

.muted-note {
  font-size: 0.9375rem;
  color: var(--text-soft);
  margin: -0.5em 0 1.5em;
}

.award-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
}
.award-list li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  align-items: center;
  padding: 18px 4px;
  border-bottom: 1px solid var(--border);
  transition: padding var(--transition), background var(--transition);
}
.award-list li:hover {
  padding-left: 12px;
  padding-right: 12px;
  background: var(--surface);
}
.award-rank {
  font-family: var(--font-mono);
  font-size: 0.6875rem; font-weight: 700;
  letter-spacing: 0.06em;
  padding: 5px 0;
  border-radius: 999px;
  text-align: center;
  text-transform: uppercase;
}
.award-rank.rank-gold {
  background: var(--gradient);
  color: var(--bg);
}
.award-rank.rank-silver {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.award-rank.rank-honor,
.award-rank:not(.rank-gold):not(.rank-silver) {
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ---------- CTA Section ---------- */
.cta-section {
  position: relative;
  overflow: hidden;
}
.cta-card {
  position: relative;
  border-radius: var(--radius-xl);
  padding: clamp(48px, 8vw, 96px) clamp(32px, 6vw, 64px);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  overflow: hidden;
}
.cta-card::before {
  content: '';
  position: absolute;
  top: -50%; left: 50%;
  width: 600px; height: 600px;
  transform: translateX(-50%);
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 60%);
  filter: blur(80px);
  opacity: 0.2;
  pointer-events: none;
}
.cta-card > * { position: relative; z-index: 1; }
.cta-card h2 { margin: 0 0 12px; }
.cta-card p { margin: 0 auto 28px; max-width: 480px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 72px 0 40px;
  margin-top: 64px;
  background: var(--bg-soft);
  position: relative;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.footer-brand {
  font-weight: 700;
  margin: 0 0 8px;
  font-size: 1.0625rem;
}
.footer-desc {
  color: var(--text-muted);
  margin: 0;
  font-size: 0.9375rem;
  max-width: 320px;
}
.footer-links {
  display: flex; flex-direction: column; gap: 12px;
  font-size: 0.9375rem;
}
.footer-links a {
  color: var(--text-muted);
  display: inline-flex; align-items: center; gap: 8px;
  transition: color var(--transition);
  width: fit-content;
}
.footer-links a:hover { color: var(--text); }
.footer-links a::before {
  content: '→';
  opacity: 0; margin-right: -16px;
  transition: opacity var(--transition), margin var(--transition);
}
.footer-links a:hover::before { opacity: 1; margin-right: 0; }
.footer-links .footer-soon {
  color: var(--text-soft);
  font-size: 0.9375rem;
  width: fit-content;
  cursor: default;
}
.footer-copy {
  grid-column: 1 / -1;
  font-size: 0.8125rem;
  color: var(--text-soft);
  margin: 56px 0 0;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Split-char reveal ---------- */
.split-ready {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}
.split-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
  transition-delay: calc(var(--i, 0) * 32ms);
}
.split-ready.is-visible .split-char {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Scroll progress bar ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 60;
  pointer-events: none;
  will-change: transform;
}

/* ---------- Magnetic button ---------- */
.btn-primary.is-magnetic {
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1),
              background var(--transition),
              color var(--transition),
              border-color var(--transition);
}

/* ---------- Page fade ---------- */
html { background: var(--bg); }
@keyframes page-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
main { animation: page-in 320ms var(--ease) both; }
body.is-leaving main {
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
  animation: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .nav-toggle { display: flex; }
  .nav-list {
    position: absolute;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    gap: 4px;
    padding: 16px 20px 24px;
    background: rgba(10,10,12,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav-list.open { display: flex; }
  .nav-list a {
    width: 100%;
    padding: 14px 16px;
    border-radius: var(--radius);
  }
  .hero { padding: 64px 0 48px; }
  .hero-title { font-size: clamp(2.5rem, 11vw, 3.5rem); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 24px 16px; }
  .stat-value { font-size: 1.875rem; }
  .award-list li {
    grid-template-columns: 72px 1fr;
    gap: 16px;
    padding: 14px 4px;
  }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- Print / Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}