/* ============================================================
   Chi-June Chen — personal site
   Ember/forge on warm-dark. Mobile-first.
   ============================================================ */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint forge grain */
  background-image:
    radial-gradient(900px 500px at 78% -8%, rgba(255,106,31,.10), transparent 60%),
    radial-gradient(700px 420px at -5% 8%, rgba(255,38,48,.06), transparent 55%);
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.04; margin: 0; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.sprite { position: absolute; }
.ico { width: 1.05em; height: 1.05em; display: inline-block; vertical-align: -0.16em; }

/* ----- a11y ----- */
.skip-link {
  position: absolute; left: 0.6rem; top: -3rem; z-index: 100;
  background: var(--ember); color: var(--on-ember);
  padding: 0.55rem 0.9rem; border-radius: 8px; font-weight: 600;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 0.6rem; }

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

/* mono helper voice */
.eyebrow, .manifest__code, .exp__when, .article__src, .degree__when,
.nav__mark, .focus li, .tag, .card__name, .footer__meta, .award__detail {
  font-family: var(--font-mono);
}

.eyebrow {
  color: var(--ember);
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 0.9rem;
}
.eyebrow::before { content: "// "; color: var(--flame); opacity: .8; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0.7rem var(--gutter);
  display: flex; align-items: center; gap: 1rem;
}
.nav__brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 600; }
.nav__name { font-family: var(--font-display); font-size: var(--step-1); letter-spacing: -0.01em; }
.nav__links { margin-left: auto; display: none; gap: 1.4rem; }
.nav__links a { color: var(--muted); font-size: var(--step--1); transition: color 0.2s var(--ease); }
.nav__links a:hover { color: var(--text); }
.nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after {
  content: ""; display: block; height: 2px; margin-top: 3px;
  background: var(--gradient); border-radius: 2px;
}
.nav__cta {
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.45rem 0.85rem; border: 1px solid var(--line);
  border-radius: var(--radius-pill); color: var(--text); font-size: var(--step--1);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav__cta:hover { border-color: var(--ember); background: var(--ember-soft, rgba(255,106,31,.1)); }
@media (min-width: 760px) { .nav__links { display: flex; } }

/* ============================================================
   SHARED LINK BUTTONS
   ============================================================ */
.links { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.link-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1rem; border-radius: var(--radius-pill);
  border: 1px solid var(--line); background: var(--surface);
  color: var(--text); font-size: var(--step--1); font-weight: 500;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.link-btn:hover { transform: translateY(-2px); border-color: var(--ember); }
.link-btn--primary {
  background: var(--gradient); color: var(--on-ember); border-color: transparent;
  box-shadow: 0 6px 22px -10px var(--glow);
}
.link-btn--primary:hover { box-shadow: 0 10px 30px -10px var(--glow); }

/* ============================================================
   HERO
   ============================================================ */
.hero { position: relative; overflow: hidden; }
.hero__glow {
  position: absolute; inset: -30% -10% auto -10%; height: 120%;
  background: radial-gradient(60% 60% at 30% 20%, rgba(255,106,31,.22), transparent 70%);
  filter: blur(10px); pointer-events: none; z-index: 0;
}
.hero__inner {
  position: relative; z-index: 1;
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(3rem, 9vw, 6rem) var(--gutter) clamp(3rem, 7vw, 5rem);
  display: grid; gap: clamp(2rem, 5vw, 3.5rem);
}
.hero__name {
  font-size: var(--step-hero); font-weight: 700; letter-spacing: -0.035em;
  margin: 0.2rem 0 0.9rem;
}
.hero__tagline {
  font-family: var(--font-mono); color: var(--ember-hi);
  font-size: var(--step-1); margin-bottom: 1.3rem; letter-spacing: -0.01em;
}
.hero__intro { color: var(--muted); max-width: 46ch; margin-bottom: 1.8rem; }

/* manifest "struct" — the signature element */
.manifest {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255,106,31,.05), transparent 40%),
    var(--bg-soft);
  box-shadow: 0 30px 80px -40px var(--glow), inset 0 1px 0 rgba(255,255,255,.03);
  overflow: hidden; align-self: start;
}
.manifest__bar {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 0.95rem; border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--faint);
}
.manifest__bar .dot { width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--line); }
.manifest__bar .dot:first-child { background: var(--flame); }
.manifest__file { margin-left: auto; }
.manifest__code { margin: 0; padding: 1.1rem 1.2rem; overflow-x: auto; }
.manifest__code code {
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.85;
  color: var(--muted); white-space: pre;
}
.c-kw { color: var(--ember); } .c-ty { color: var(--ember-hi); font-weight: 500; }
.c-str { color: #e7b483; } .c-fn { color: var(--text); border-bottom: 1px solid var(--ember); }

@media (min-width: 900px) {
  .hero__inner { grid-template-columns: 1.15fr 0.85fr; align-items: center; }
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  max-width: var(--maxw); margin: 0 auto;
  padding: var(--section-y) var(--gutter);
  border-top: 1px solid var(--line-soft);
}
.section__head { margin-bottom: clamp(1.8rem, 4vw, 2.8rem); }
.section__title { font-size: var(--step-3); letter-spacing: -0.025em; max-width: 18ch; }
.section__sub { color: var(--muted); margin-top: 0.7rem; font-size: var(--step--1); }
.section__sub a { color: var(--ember-hi); border-bottom: 1px solid transparent; }
.section__sub a:hover { border-color: currentColor; }

/* ----- About ----- */
.about { display: grid; gap: 1.6rem; }
.about__body { color: var(--muted); max-width: 62ch; font-size: var(--step-1); line-height: 1.7; }
.focus { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.focus li {
  font-size: var(--step--1); color: var(--ember-hi);
  border: 1px solid var(--line); border-radius: var(--radius-pill);
  padding: 0.35rem 0.8rem; background: var(--surface);
}

/* ----- Experience timeline ----- */
.timeline { display: grid; gap: 1.1rem; }
.exp {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: clamp(1.1rem, 3vw, 1.6rem);
  position: relative; transition: border-color 0.25s var(--ease);
}
.exp::before {
  content: ""; position: absolute; left: 0; top: 1.4rem; bottom: 1.4rem; width: 2px;
  background: var(--gradient); border-radius: 2px; opacity: 0; transition: opacity 0.25s var(--ease);
}
.exp:hover { border-color: var(--line); }
.exp:hover::before { opacity: 1; }
.exp__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.4rem 0.9rem; margin-bottom: 0.9rem; }
.exp__role { font-size: var(--step-1); font-family: var(--font-display); }
.exp__tag {
  font-family: var(--font-mono); font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--ember); border: 1px solid var(--line); border-radius: var(--radius-pill);
  padding: 0.1rem 0.45rem; vertical-align: 0.18em;
}
.exp__co { color: var(--ember-hi); font-weight: 600; }
.exp__when { color: var(--faint); font-size: var(--step--1); margin-left: auto; }
.exp__points { display: grid; gap: 0.55rem; }
.exp__points li { color: var(--muted); padding-left: 1.2rem; position: relative; }
.exp__points li::before { content: "▸"; position: absolute; left: 0; color: var(--ember); }

/* ----- Filters + Work cards ----- */
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.6rem; }
.chip-btn {
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted);
  background: transparent; border: 1px solid var(--line); border-radius: var(--radius-pill);
  padding: 0.45rem 0.95rem; cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.chip-btn:hover { color: var(--text); border-color: var(--ember); }
.chip-btn.is-active { color: var(--on-ember); background: var(--gradient); border-color: transparent; }

.cards { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .cards { grid-template-columns: 1fr 1fr; } }
@media (min-width: 980px) { .cards { grid-template-columns: 1fr 1fr 1fr; } }

.card {
  display: flex; flex-direction: column; gap: 0.7rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: 1.15rem 1.2rem;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}
.card:hover {
  transform: translateY(-4px); border-color: var(--ember);
  background: var(--surface-2);
  box-shadow: 0 20px 44px -26px var(--glow);
}
.card.is-hidden { display: none; }
.card__name {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem;
  font-size: 0.95rem; color: var(--text); font-weight: 500;
}
.card__go { color: var(--faint); margin-left: auto; transition: color 0.2s var(--ease); }
.card:hover .card__go { color: var(--ember); }
.card__award {
  font-family: var(--font-body); font-size: 0.66rem; font-weight: 600;
  color: var(--ember-hi); background: rgba(255,106,31,.12);
  border-radius: var(--radius-pill); padding: 0.12rem 0.5rem;
}
.card__desc { color: var(--muted); font-size: var(--step--1); line-height: 1.55; flex: 1; }
.card__live {
  display: inline-block; margin-top: 0.35rem;
  font-family: var(--font-mono, monospace); font-size: 0.7rem;
  color: var(--ember-hi); white-space: nowrap;
}
.card__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag { font-size: 0.66rem; color: var(--faint); border: 1px solid var(--line-soft); border-radius: 6px; padding: 0.12rem 0.45rem; }

/* ----- Featured project (Octopus) ----- */
.card--featured { grid-column: 1 / -1; flex-direction: column; padding: 0; gap: 0; overflow: hidden; }
.card--featured .card__media {
  position: relative; overflow: hidden;
  background: var(--surface-2); border-bottom: 1px solid var(--line);
  aspect-ratio: 16 / 9;
}
.card--featured .card__media img {
  width: 100%; height: 100%; display: block;
  object-fit: cover; object-position: center top;
  transition: transform 0.5s var(--ease);
}
.card--featured:hover .card__media img { transform: scale(1.035); }
.card--featured .card__body {
  display: flex; flex-direction: column; gap: 0.7rem;
  padding: 1.25rem 1.35rem 1.4rem;
}
.card--featured .card__name {
  font-family: var(--font-display); font-size: 1.2rem; letter-spacing: -0.01em;
}
.card--featured .card__desc { font-size: var(--step-0); max-width: 54ch; }

@media (min-width: 760px) {
  .card--featured { flex-direction: row; align-items: stretch; min-height: 340px; }
  .card--featured .card__media {
    flex: 1 1 58%; aspect-ratio: auto; align-self: stretch;
    border-bottom: none; border-right: 1px solid var(--line);
  }
  .card--featured .card__body {
    flex: 1 1 42%; justify-content: center; gap: 0.9rem; padding: 1.8rem 2rem;
  }
  .card--featured .card__name { font-size: 1.45rem; }
}

/* ----- Writing ----- */
.writing { display: grid; gap: 0.4rem; }
.article {
  display: flex; align-items: baseline; gap: 1rem;
  padding: 1.05rem 0.2rem; border-bottom: 1px solid var(--line-soft);
}
.article:first-child { border-top: 1px solid var(--line-soft); }
.article__link { display: grid; gap: 0.25rem; flex: 1; }
.article__title { font-family: var(--font-display); font-size: var(--step-1); transition: color 0.2s var(--ease); }
.article:hover .article__title { color: var(--ember-hi); }
.article__gloss { color: var(--muted); font-size: var(--step--1); }
.article__src { color: var(--faint); font-size: 0.72rem; white-space: nowrap; }
.more { display: inline-block; margin-top: 1.4rem; color: var(--ember-hi); font-weight: 500; border-bottom: 1px solid transparent; }
.more:hover { border-color: currentColor; }

/* ----- Awards ----- */
.awards { display: grid; gap: 0.9rem; }
.award { display: flex; gap: 0.9rem; align-items: flex-start; }
.award__trophy { font-size: 1.1rem; line-height: 1.4; }
.award__body { display: grid; gap: 0.2rem; }
.award__title { font-weight: 600; }
.award__detail { color: var(--muted); font-size: var(--step--1); }

/* ----- Education ----- */
.edu { display: grid; gap: 1rem; }
.degree {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: clamp(1.1rem, 3vw, 1.5rem);
}
.degree__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.4rem 0.9rem; }
.degree__title { font-size: var(--step-1); }
.degree__when { color: var(--faint); font-size: var(--step--1); margin-left: auto; }
.degree__school { display: block; color: var(--ember-hi); font-weight: 600; margin-top: 0.3rem; }
.degree__note { color: var(--muted); font-size: var(--step--1); margin-top: 0.7rem; max-width: 70ch; }
.degree__note em { color: var(--text); font-style: italic; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { border-top: 1px solid var(--line); background: var(--bg-soft); }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: var(--section-y) var(--gutter); }
.footer__lead { font-family: var(--font-display); font-size: var(--step-3); letter-spacing: -0.025em; margin-bottom: 1.6rem; }
.footer__meta { color: var(--faint); font-size: var(--step--1); margin-top: 2rem; }

/* ============================================================
   SCROLL REVEAL (progressive enhancement — only when JS active)
   ============================================================ */
.js .reveal { opacity: 0; transform: translateY(16px); }
.js .reveal.is-in { opacity: 1; transform: none; transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease); }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; }
}