/* ==========================================================
   TOKENS
   ========================================================== */
:root {
  --bg: #14161C;
  --bg-soft: #1A1D25;
  --surface: #1F222C;
  --surface-2: #262A35;
  --line: rgba(236, 233, 226, 0.09);
  --line-strong: rgba(236, 233, 226, 0.16);
  --text: #ECE9E2;
  --text-muted: #9B9EA8;
  --text-dim: #6D707A;
  --accent: #D9A544;       /* generated-token amber */
  --accent-soft: rgba(217, 165, 68, 0.14);
  --accent-2: #5FA8A0;     /* dusty teal, secondary signal */
  --accent-2-soft: rgba(95, 168, 160, 0.14);
  --font-display: 'Fraunces', 'Noto Sans SC', serif;
  --font-body: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Noto Sans SC', monospace;
  --container: 1160px;
  --radius: 14px;
}

html[data-lang="zh"] {
  --font-display: 'Noto Sans SC', 'Fraunces', serif;
  --font-body: 'Noto Sans SC', 'Space Grotesk', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-display); margin: 0; font-weight: 600; }
p { margin: 0; }

::selection { background: var(--accent-soft); color: var(--text); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ==========================================================
   BACKGROUND CANVAS
   ========================================================== */
#bgCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.5;
  pointer-events: none;
}

/* ==========================================================
   PROGRESS RAIL
   ========================================================== */
.progress-rail {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: transparent;
  z-index: 200;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.1s linear;
}

/* ==========================================================
   HEADER
   ========================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 150;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(20, 22, 28, 0.85);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--line);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.04em;
}
.logo-dot { color: var(--accent); }
.main-nav {
  display: flex;
  gap: 30px;
}
.main-nav a {
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s ease;
  position: relative;
}
.main-nav a:hover { color: var(--text); }
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.main-nav a:hover::after { width: 100%; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.lang-toggle {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  color: var(--text-muted);
  border-radius: 20px;
  padding: 6px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: border-color 0.2s ease;
}
.lang-toggle:hover { border-color: var(--accent); }
.lang-opt { padding: 1px 4px; border-radius: 10px; }
.lang-opt.active { color: var(--accent); font-weight: 600; }
.lang-sep { color: var(--text-dim); }

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-burger span {
  width: 20px; height: 2px;
  background: var(--text);
  transition: all 0.25s ease;
}
.nav-burger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ==========================================================
   LAYOUT HELPERS
   ========================================================== */
.section {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 110px 28px;
}
.section-head { margin-bottom: 48px; max-width: 640px; }
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 14px;
}
.section-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.2;
}
.more-head { margin-top: 90px; }

/* ==========================================================
   HERO
   ========================================================== */
.hero {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 170px 28px 100px;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 50px;
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--accent-2);
  margin: 0 0 20px;
}
.hero-title { margin-bottom: 22px; }
.hero-name {
  font-size: clamp(36px, 5.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
}
.hero-stream {
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.7vw, 17px);
  color: var(--text-muted);
  margin-bottom: 30px;
  min-height: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.stream-prompt { color: var(--accent); }
.stream-text { color: var(--text); }
.stream-cursor {
  color: var(--accent);
  animation: blink 1s step-start infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  max-width: 560px;
  color: var(--text-muted);
  font-size: 16.5px;
  margin-bottom: 34px;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 54px;
}
.btn {
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 13px 22px;
  border-radius: 30px;
  border: 1px solid var(--line-strong);
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  display: inline-flex;
  align-items: center;
}
.btn-primary {
  background: var(--accent);
  color: #191307;
  border-color: var(--accent);
  font-weight: 600;
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
  color: var(--text);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 34px;
}
.stat {
  display: flex;
  flex-direction: column;
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}
.stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums lining-nums;
  font-weight: 600;
  font-size: 28px;
  letter-spacing: -0.01em;
  color: var(--accent);
}
.stat-label {
  font-size: 11.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 6px;
  max-width: 120px;
}

.hero-portrait {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}
.portrait-frame {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 3/4;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  position: relative;
}
.portrait-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(20,22,28,0.55));
}
.portrait-frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(0.15) contrast(1.03);
}
.portrait-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 7px 14px;
}
.portrait-tag .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
}

/* ==========================================================
   ABOUT
   ========================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
}
.about-text {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.75;
}
.about-facts {
  display: flex;
  flex-direction: column;
  gap: 18px;
  border-left: 1px solid var(--line);
  padding-left: 26px;
}
.fact { display: flex; flex-direction: column; gap: 3px; }
.fact-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.fact-v { font-size: 15px; color: var(--text); }

/* ==========================================================
   SKILLS
   ========================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.skill-card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.skill-card h3 {
  font-size: 15px;
  color: var(--accent-2);
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.skill-card li {
  font-size: 14.5px;
  color: var(--text-muted);
  padding: 6px 0;
  border-top: 1px solid var(--line);
}
.skill-card li:first-child { border-top: none; }

/* ==========================================================
   TIMELINE
   ========================================================== */
.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 1px solid var(--line-strong);
}
.timeline-item {
  position: relative;
  padding-bottom: 52px;
}
.timeline-item:last-child { padding-bottom: 0; }
.tl-marker {
  position: absolute;
  left: -34px;
  top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.tl-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-2);
  letter-spacing: 0.04em;
}
.tl-content h3 {
  font-size: 21px;
  margin: 8px 0 4px;
}
.tl-company {
  color: var(--text-muted);
  font-size: 14.5px;
  margin-bottom: 14px;
}
.tl-loc { color: var(--text-dim); }
.tl-content ul { display: flex; flex-direction: column; gap: 8px; }
.tl-content li {
  font-size: 14.5px;
  color: var(--text-muted);
  padding-left: 18px;
  position: relative;
  line-height: 1.55;
}
.tl-content li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ==========================================================
   PROJECTS — FEATURED
   ========================================================== */
/* .featured-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
} */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feat-card {
  background: linear-gradient(160deg, var(--surface) 0%, var(--bg-soft) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.feat-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.feat-head h3 { font-size: 22px; margin-bottom: 4px; }
.feat-tag {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 16px;
}
.feat-desc {
  color: var(--text-muted);
  font-size: 15px;
  margin-bottom: 16px;
  line-height: 1.6;
}
.feat-bullets {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.feat-bullets li {
  font-size: 13.8px;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
  line-height: 1.55;
}
.feat-bullets li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-size: 20px;
  line-height: 1;
  top: -3px;
}
.tech-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tech-pill {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-muted);
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 5px 11px;
}
.tech-pill.sm { font-size: 11px; padding: 4px 9px; }

/* ==========================================================
   PROJECTS — MORE (compact grid)
   ========================================================== */
.more-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.more-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.more-card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.more-card h4 { font-size: 16.5px; margin-bottom: 4px; }
.more-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--accent-2);
  margin-bottom: 10px;
}
.more-desc {
  font-size: 13.6px;
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.55;
}

/* ==========================================================
   EDUCATION
   ========================================================== */
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.edu-col h3 {
  font-size: 18px;
  margin-bottom: 22px;
  color: var(--accent-2);
}
.edu-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.edu-item:first-of-type { border-top: none; }
.edu-date {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-dim);
}
.edu-title { font-size: 15px; }
.cert-item {
  display: block;
  font-size: 14.5px;
  color: var(--text-muted);
  padding: 12px 0;
  border-top: 1px solid var(--line);
  transition: color 0.2s ease;
  cursor: pointer;
}
.cert-item:first-of-type { border-top: none; }
.cert-item:hover { color: var(--accent); }

/* ==========================================================
   CONTACT
   ========================================================== */
.contact {
  text-align: center;
}
.contact-inner { max-width: 720px; margin: 0 auto; }
.contact h2 {
  font-size: clamp(26px, 4vw, 38px);
  margin: 18px 0 14px;
}
.contact-sub {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 46px;
}
.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}
.contact-link {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 16px 22px;
  min-width: 190px;
  text-align: left;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.contact-link:hover { border-color: var(--accent); transform: translateY(-3px); }
.contact-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.contact-v { font-size: 14.5px; color: var(--text); }

/* ==========================================================
   FOOTER
   ========================================================== */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 34px 28px 46px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

/* ==========================================================
   SCROLL REVEAL
   ========================================================== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease var(--d, 0s), transform 0.6s ease var(--d, 0s);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none; opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; padding-top: 140px; }
  .hero-portrait { order: -1; max-width: 220px; margin: 0 auto 20px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 34px; }
  .about-facts { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: 24px; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .featured-grid { grid-template-columns: 1fr; }
  .more-grid { grid-template-columns: repeat(2, 1fr); }
  .edu-grid { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 680px) {
  .main-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(20,22,28,0.97);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: 20px 28px 26px;
    gap: 18px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s ease;
  }
  .main-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-burger { display: flex; }
  .section { padding: 80px 20px; }
  .hero { padding: 130px 20px 70px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .skills-grid { grid-template-columns: 1fr; }
  .more-grid { grid-template-columns: 1fr; }
  .contact-link { width: 100%; }
}