/* =========================================================
   Ronald Ng — portfolio
   Editorial minimalist, dark theme, single accent.
   Zero-build static CSS.
   ========================================================= */

:root {
  --bg: #0b0d12;
  --bg-elev: #12151d;
  --line: #23283340;
  --line-solid: #232833;
  --text: #eef1f6;
  --text-dim: #9aa3b2;
  --text-faint: #6b7480;
  --accent: #5c8cff;
  --accent-soft: #5c8cff1a;
  --radius: 14px;
  --maxw: 1120px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

a { color: inherit; text-decoration: none; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #06070a;
  padding: 10px 16px;
  border-radius: 0 0 var(--radius) 0;
  z-index: 1000;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- shared layout ---------- */
section { padding: clamp(64px, 10vw, 128px) 24px; }
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.section-head { max-width: var(--maxw); margin: 0 auto clamp(40px, 6vw, 72px); }
.section-intro {
  color: var(--text-dim);
  margin-top: 16px;
  max-width: 55ch;
  font-size: 1.05rem;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: 999px;
  padding: 13px 26px;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease), color 0.2s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
  cursor: pointer;
}
.btn:active { transform: translateY(1px) scale(0.99); }
.btn--primary { background: var(--accent); color: #06070a; }
.btn--primary:hover { background: #7aa0ff; }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-solid);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--nav { padding: 9px 18px; background: var(--accent-soft); color: var(--accent); border: 1px solid transparent; }
.btn--nav:hover { background: var(--accent); color: #06070a; }
.btn--lg { padding: 17px 34px; font-size: 1.1rem; font-family: var(--font-mono); letter-spacing: -0.01em; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: saturate(140%) blur(14px);
  background: #0b0d12cc;
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 24px;
}
.nav__brand { display: flex; align-items: center; gap: 11px; }
.nav__brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-solid);
  border-radius: 9px;
  color: var(--accent);
}
.nav__brand-name { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }
.nav__links { display: flex; gap: 28px; font-size: 0.95rem; }
.nav__links a { color: var(--text-dim); transition: color 0.2s var(--ease); }
.nav__links a:hover { color: var(--text); }

@media (max-width: 760px) {
  .nav__links { display: none; }
  .nav__brand-name { display: none; }
}

/* ---------- hero ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-top: clamp(60px, 10vw, 110px);
  padding-bottom: clamp(48px, 8vw, 96px);
}
.hero__inner { max-width: 900px; }
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.01em;
  margin-bottom: 28px;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.6rem, 7vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  max-width: 15ch;
}
.hero__accent { color: var(--accent); display: block; }
.hero__lede {
  color: var(--text-dim);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  max-width: 54ch;
  margin-top: 28px;
}
.hero__cta { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }

.hero__meta {
  max-width: var(--maxw);
  margin: clamp(56px, 8vw, 88px) auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-solid);
  border: 1px solid var(--line-solid);
  border-radius: var(--radius);
  overflow: hidden;
}
.hero__stat { background: var(--bg); padding: 28px 24px; }
.hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  color: var(--text);
  letter-spacing: -0.02em;
}
.hero__stat-label { display: block; color: var(--text-faint); font-size: 0.85rem; margin-top: 8px; }

@media (max-width: 760px) {
  .hero__meta { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- work ---------- */
.work { max-width: var(--maxw); margin: 0 auto; }
.work__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.proj {
  background: var(--bg-elev);
  border: 1px solid var(--line-solid);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 28px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.proj:hover { transform: translateY(-4px); border-color: #3a4152; }
.proj--feature { grid-column: 1 / -1; }
.proj--feature .proj__name { font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
.proj--feature .proj__desc { max-width: 70ch; font-size: 1.08rem; }
.proj__tagline {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 14px;
}
.proj__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.proj__desc { color: var(--text-dim); }
.proj__tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.proj__tags li {
  font-size: 0.78rem;
  color: var(--text-dim);
  border: 1px solid var(--line-solid);
  border-radius: 999px;
  padding: 5px 12px;
}
.proj__role {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--line-solid);
  font-weight: 600;
  font-size: 0.95rem;
}
.proj__years { font-family: var(--font-mono); color: var(--text-faint); font-weight: 400; font-size: 0.85rem; }

@media (max-width: 760px) {
  .work__grid { grid-template-columns: 1fr; }
  .proj { padding: 26px; }
}

/* ---------- capabilities ---------- */
.caps { max-width: var(--maxw); margin: 0 auto; }
.caps__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line-solid); border: 1px solid var(--line-solid); border-radius: var(--radius); overflow: hidden; margin-top: 44px; }
.cap { background: var(--bg); padding: 34px 32px; }
.cap h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; letter-spacing: -0.01em; margin-bottom: 12px; }
.cap p { color: var(--text-dim); font-size: 0.98rem; }
@media (max-width: 760px) { .caps__grid { grid-template-columns: 1fr; } }

/* ---------- writing & speaking ---------- */
.writing { max-width: var(--maxw); margin: 0 auto; }
.writing__list { list-style: none; }
.writing__item { border-top: 1px solid var(--line-solid); }
.writing__item:last-child { border-bottom: 1px solid var(--line-solid); }
.writing__link {
  display: grid;
  grid-template-columns: 210px 1fr auto;
  gap: 24px;
  align-items: baseline;
  padding: 24px 4px;
  transition: background 0.2s var(--ease), padding-left 0.25s var(--ease);
}
.writing__link:hover { background: var(--bg-elev); padding-left: 16px; }
.writing__kind {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
}
.writing__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.writing__link:hover .writing__name { color: var(--accent); }
.writing__meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  text-align: right;
  white-space: nowrap;
}
@media (max-width: 760px) {
  .writing__link { grid-template-columns: 1fr; gap: 6px; }
  .writing__meta { text-align: left; }
  .writing__link:hover { padding-left: 4px; }
}

/* ---------- experience ---------- */
.exp { max-width: var(--maxw); margin: 0 auto; }
.exp__list { list-style: none; }
.exp__item {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  gap: 24px;
  align-items: baseline;
  padding: 24px 0;
  border-top: 1px solid var(--line-solid);
}
.exp__item:last-child { border-bottom: 1px solid var(--line-solid); }
.exp__year { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-faint); }
.exp__role { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; letter-spacing: -0.01em; }
.exp__org { color: var(--text-dim); font-size: 0.92rem; text-align: right; }
@media (max-width: 760px) {
  .exp__item { grid-template-columns: 1fr; gap: 6px; }
  .exp__org { text-align: left; }
}

/* ---------- credentials ---------- */
.cred {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
}
.cred__list { list-style: none; margin-top: 28px; }
.cred__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.cred__list span { font-weight: 500; }
.cred__list small { color: var(--text-faint); font-size: 0.82rem; white-space: nowrap; }
.cred__subhead { margin-top: 48px; }
@media (max-width: 760px) { .cred { grid-template-columns: 1fr; } }

/* ---------- contact ---------- */
.contact { max-width: var(--maxw); margin: 0 auto; }
.contact__inner {
  background: var(--bg-elev);
  border: 1px solid var(--line-solid);
  border-radius: var(--radius);
  padding: clamp(48px, 8vw, 88px);
  text-align: center;
}
.contact__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 20ch;
  margin: 0 auto;
}
.contact__lede { color: var(--text-dim); max-width: 52ch; margin: 24px auto 40px; font-size: 1.1rem; }
.contact__links { display: flex; flex-wrap: wrap; gap: 20px 28px; justify-content: center; margin-top: 36px; font-size: 0.95rem; }
.contact__links a { color: var(--text-dim); border-bottom: 1px solid transparent; padding-bottom: 2px; transition: color 0.2s var(--ease), border-color 0.2s var(--ease); }
.contact__links a:hover { color: var(--accent); border-color: var(--accent); }
.contact__mcp-note {
  margin-top: 20px;
  color: var(--text-faint);
  font-size: 0.85rem;
}
.contact__mcp-note code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--line-solid);
  border-radius: 6px;
  padding: 2px 7px;
}

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 32px 24px; }
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--text-faint);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* focus states */
a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}