/* Harry Yuu — personal site · dark editorial */
:root {
  --bg: #0a0a0a;
  --bg-elevated: #121212;
  --bg-card: #141414;
  --text: #f4f2ef;
  --text-muted: rgba(244, 242, 239, 0.62);
  --text-dim: rgba(244, 242, 239, 0.38);
  --accent: #ff5a1f;
  --accent-soft: rgba(255, 90, 31, 0.14);
  --border: rgba(244, 242, 239, 0.1);
  --border-strong: rgba(244, 242, 239, 0.18);
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --nav-h: 4.25rem;
  --max: 1120px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 0.5rem);
}

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

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

.mono { font-family: var(--font-mono); }

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  opacity: 0.04;
  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='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  background: rgba(10, 10, 10, 0.72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 10, 10, 0.88);
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.28em;
  transition: color 0.25s var(--ease);
}

.nav-brand:hover { color: var(--accent); }

.nav-links {
  display: none;
  gap: 1.75rem;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.25s var(--ease);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color 0.25s, color 0.25s;
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
  border-color: var(--accent);
  color: var(--text);
}

.lang-toggle .lang-active { color: var(--accent); }
.lang-sep { opacity: 0.4; margin: 0 0.15rem; }

.nav-menu {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 0.35rem;
}

.nav-menu span {
  display: block;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-menu[aria-expanded="true"] span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}
.nav-menu[aria-expanded="true"] span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem var(--gutter) 1.5rem;
  background: rgba(10, 10, 10, 0.96);
  border-bottom: 1px solid var(--border);
}

.mobile-nav[hidden] { display: none; }

.mobile-nav a {
  padding: 0.85rem 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.mobile-nav a:hover { color: var(--accent); }

@media (min-width: 768px) {
  .nav-links { display: flex; }
  .nav-menu { display: none; }
  .mobile-nav { display: none !important; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.35rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.3s var(--ease), background 0.25s, border-color 0.25s, color 0.25s;
}

.btn:hover { transform: translateY(-2px) scale(1.02); }
.btn:active { transform: translateY(0) scale(0.99); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--accent);
  color: #0a0a0a;
  font-weight: 600;
}

.btn-primary:hover { background: #ff7340; }

.btn-ghost {
  border-color: var(--border-strong);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + 2rem) var(--gutter) 4rem;
}

.hero-grid {
  max-width: var(--max);
  margin: 0 auto;
  width: 100%;
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4rem;
  }
}

.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-name {
  display: block;
  font-size: clamp(2.75rem, 8vw, 5rem);
}

.hero-accent {
  display: block;
  font-size: clamp(1.35rem, 3.5vw, 2rem);
  font-weight: 600;
  color: var(--accent);
  margin-top: 0.35rem;
  letter-spacing: -0.01em;
}

.hero-lead {
  max-width: 34rem;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-visual { justify-self: center; width: 100%; max-width: 380px; }

.hero-panel {
  position: relative;
  aspect-ratio: 1;
  border-radius: 1.5rem;
  border: 1px solid var(--border);
  background:
    radial-gradient(ellipse 60% 50% at 70% 30%, rgba(255, 90, 31, 0.22), transparent 55%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(255, 90, 31, 0.08), transparent 50%),
    linear-gradient(160deg, #161616 0%, #0c0c0c 100%);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
}

.panel-ring {
  position: absolute;
  width: 62%;
  height: 62%;
  top: 18%;
  left: 19%;
  border-radius: 50%;
  border: 1px solid rgba(255, 90, 31, 0.35);
  animation: pulse-ring 4.5s var(--ease) infinite;
}

.panel-orb {
  position: absolute;
  width: 28%;
  height: 28%;
  top: 35%;
  left: 36%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ff8a55, var(--accent) 55%, #c43a10);
  box-shadow: 0 0 60px rgba(255, 90, 31, 0.45);
  animation: float-orb 5s ease-in-out infinite;
}

.panel-lines {
  position: absolute;
  inset: 12%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  pointer-events: none;
  opacity: 0.2;
}

.panel-lines span {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text), transparent);
}

.panel-label {
  position: relative;
  z-index: 1;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.06); opacity: 0.55; }
}

@keyframes float-orb {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-scroll {
  position: absolute;
  bottom: 1.75rem;
  left: var(--gutter);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  color: var(--text-dim);
}

.scroll-line {
  display: block;
  width: 48px;
  height: 1px;
  background: var(--text-dim);
  transform-origin: left;
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { transform: scaleX(1); opacity: 0.4; }
  50% { transform: scaleX(1.4); opacity: 1; }
}

/* Sections */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) var(--gutter);
}

.section-head {
  margin-bottom: clamp(2rem, 5vw, 3rem);
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-note {
  margin-top: 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 36rem;
}

/* About */
.about-grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 800px) {
  .about-grid {
    grid-template-columns: 1.4fr 0.8fr;
    gap: 3.5rem;
    align-items: start;
  }
}

.about-text p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.15rem;
}

.about-text p:last-child { margin-bottom: 0; }

.about-meta {
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.35rem 1.5rem;
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-k {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.meta-item > span:last-child {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Capabilities */
.cap-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .cap-grid { grid-template-columns: 1fr 1fr; }
}

.cap-card {
  position: relative;
  padding: 1.5rem 1.4rem 1.6rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--bg-card);
  transition: transform 0.35s var(--ease), border-color 0.3s, background 0.3s;
}

.cap-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 90, 31, 0.45);
  background: linear-gradient(165deg, rgba(255, 90, 31, 0.06), var(--bg-card) 50%);
}

.cap-num {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.85rem;
}

.cap-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.55rem;
  letter-spacing: -0.02em;
}

.cap-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Work */
.work-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.work-card {
  display: grid;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 1.15rem;
  overflow: hidden;
  background: var(--bg-card);
  transition: transform 0.35s var(--ease), border-color 0.3s;
}

.work-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
}

@media (min-width: 720px) {
  .work-card {
    grid-template-columns: 240px 1fr;
  }
}

.work-visual {
  min-height: 160px;
  position: relative;
}

.work-visual.v1 {
  background:
    linear-gradient(135deg, rgba(255, 90, 31, 0.35), transparent 55%),
    repeating-linear-gradient(-45deg, transparent, transparent 8px, rgba(255, 255, 255, 0.03) 8px, rgba(255, 255, 255, 0.03) 9px),
    #1a1210;
}

.work-visual.v2 {
  background:
    radial-gradient(circle at 30% 40%, rgba(255, 90, 31, 0.4), transparent 45%),
    radial-gradient(circle at 75% 70%, rgba(255, 140, 80, 0.15), transparent 40%),
    #101018;
}

.work-visual.v3 {
  background:
    linear-gradient(180deg, transparent 40%, rgba(10, 10, 10, 0.6)),
    conic-gradient(from 210deg at 50% 50%, #2a1812, #ff5a1f33, #1a1a1a, #2a1812);
}

.work-body {
  padding: 1.4rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.28rem 0.55rem;
  border-radius: 4px;
}

.work-body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.work-body p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.work-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.35rem;
}

.work-tags li {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}

/* Contact */
.contact {
  padding-bottom: clamp(3rem, 8vw, 5rem);
}

.contact-panel {
  border: 1px solid var(--border);
  border-radius: 1.35rem;
  padding: clamp(2rem, 5vw, 3.25rem);
  background:
    radial-gradient(ellipse 70% 80% at 100% 0%, rgba(255, 90, 31, 0.12), transparent 55%),
    var(--bg-elevated);
}

.contact-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.85rem;
}

.contact-lead {
  max-width: 36rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.contact-note {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.contact-note.flash {
  color: var(--accent);
  transition: color 0.4s;
}

/* Footer */
.footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem var(--gutter) 2.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.footer-sub { color: var(--text-dim); }

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .panel-ring,
  .panel-orb,
  .scroll-line { animation: none; }
  .btn:hover,
  .cap-card:hover,
  .work-card:hover { transform: none; }
}