/* ---------------------------------------------------------------------------
   OJ — personal site
   Restrained, typographic, warm. One column of attention.
   --------------------------------------------------------------------------- */

:root {
  --paper:      #f6f3ec;
  --paper-2:    #efeadf;
  --ink:        #1b1a17;
  --ink-soft:   #34322c;
  --muted:      #76726a;
  --hair:       #e2dccf;
  --accent:     #b3502f;   /* terracotta — used sparingly */
  --accent-dim: #c98a72;

  --sans:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --display: var(--sans);   /* single-family system: display == text, tuned per element. Swap here to reintroduce a display face. */

  --measure: 60ch;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --rule: 1px solid var(--hair);
}

/* Dark palette — only applied after the visitor explicitly chooses it. */
:root[data-theme="dark"] {
  --paper:    #14130f;
  --paper-2:  #1b1a15;
  --ink:      #ece7db;
  --ink-soft: #d6d0c2;
  --muted:    #8d887c;
  --hair:     #2c2a23;
  --accent:   #d68a5f;
  --accent-dim:#9c6a4f;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(15px, 0.6vw + 13.5px, 17px);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img { max-width: 100%; display: block; }

/* --- shell ----------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* --- top bar --------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding-top: 0.5rem;
}

.topbar__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding-block: 0.6rem;
}
.topbar__inner .mark { justify-self: start; }
.topbar__inner .theme-toggle { justify-self: end; }

.mark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.mark a { display: inline-flex; align-items: baseline; gap: 0.5ch; }
.mark .dot { color: var(--accent); }

/* floating pill / segmented nav */
nav.nav {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border: var(--rule);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper-2) 65%, transparent);
  backdrop-filter: saturate(150%) blur(10px);
  box-shadow: 0 1px 2px color-mix(in srgb, var(--ink) 5%, transparent);
}
nav.nav a {
  font-size: 0.8rem;
  letter-spacing: 0.01em;
  color: var(--muted);
  padding: 6px 13px;
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.18s ease, background 0.18s ease;
}
nav.nav a:hover { color: var(--ink); background: color-mix(in srgb, var(--paper) 55%, transparent); }
nav.nav a.active {
  color: var(--ink);
  background: var(--paper);
  box-shadow: 0 1px 2px color-mix(in srgb, var(--ink) 12%, transparent), inset 0 0 0 1px var(--hair);
}
.nav-hide { display: none; }
@media (min-width: 680px) { .nav-hide { display: inline; } }

/* theme toggle */
.theme-toggle {
  appearance: none;
  background: transparent;
  border: var(--rule);
  color: var(--muted);
  width: 30px; height: 30px;
  border-radius: 999px;
  display: inline-grid; place-items: center;
  cursor: pointer;
  padding: 0;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  align-self: center;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--muted); transform: rotate(12deg); }
.theme-toggle svg { width: 15px; height: 15px; display: block; }
.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }

/* --- hero ------------------------------------------------------------------ */

.hero { padding-block: clamp(2.5rem, 7vw, 5.5rem) clamp(2rem, 5vw, 3.5rem); position: relative; }
/* single-hue terracotta wash — warmth without the pastel-mesh cliché */
.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
  top: -9rem;
  left: 50%;
  transform: translateX(-50%);
  width: min(880px, 120%);
  height: 540px;
  background: radial-gradient(48% 58% at 50% 42%,
    color-mix(in srgb, var(--accent) 15%, transparent),
    transparent 72%);
  filter: blur(22px);
}

/* portrait thumbnail */
.avatar {
  width: clamp(64px, 8vw, 92px);
  aspect-ratio: 1;
  border-radius: 14px;
  overflow: hidden;
  background: var(--paper-2);
  border: var(--rule);
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--ink) 6%, transparent);
}
.avatar img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.98) contrast(1.02); }
.avatar__mono {
  display: none;            /* revealed only if the portrait fails to load */
  place-items: center;
  width: 100%; height: 100%;
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  background:
    radial-gradient(120% 120% at 30% 20%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 60%),
    var(--paper-2);
}

.hero__copy { max-width: var(--measure); }

.hero h1 {
  max-width: 18ch;
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2.5rem, 6.2vw, 3.7rem);
  line-height: 1.02;
  letter-spacing: -0.032em;
  margin: 0 0 1.1rem;
  font-optical-sizing: auto;
}
.hero h1 em { font-style: normal; font-weight: inherit; color: var(--accent); }

.lede { max-width: var(--measure); color: var(--ink-soft); }
.ulink { color: var(--ink); text-decoration: none; box-shadow: inset 0 -1px 0 var(--accent); transition: color 0.2s ease, box-shadow 0.2s ease; }
.ulink:hover { color: var(--accent); box-shadow: inset 0 -2px 0 var(--accent); }
.lede p { margin: 0 0 0.9rem; }
.lede p:last-child { margin-bottom: 0; }

.now {
  margin-top: 1.4rem;
  font-size: 0.88rem;
  color: var(--muted);
  display: flex; align-items: center; gap: 0.6ch; flex-wrap: wrap;
}
.now .pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-dim);
  animation: pulse 2.6s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); }
  70%  { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* --- section scaffolding --------------------------------------------------- */

section.block { padding-block: clamp(2.2rem, 5vw, 3.4rem); border-top: var(--rule); }

.block__head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; margin-bottom: 1.6rem;
}
.label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.block__head .more { font-size: 0.8rem; color: var(--muted); }
.block__head .more:hover { color: var(--accent); }

/* --- work ------------------------------------------------------------------ */

.work { display: grid; gap: 0; }
.work__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem 1.5rem;
  padding: 1.15rem 1rem;
  margin-inline: -1rem;
  border-radius: 12px;
  transition: background 0.2s ease;
}
/* inset divider so hover background can have padding without widening the lines */
.work__item + .work__item::before {
  content: "";
  position: absolute;
  top: 0; left: 1rem; right: 1rem;
  border-top: var(--rule);
}
@media (min-width: 640px) {
  .work__item { grid-template-columns: 9rem 1fr auto; align-items: baseline; }
}
.work__item:hover { background: color-mix(in srgb, var(--paper-2) 60%, transparent); }

.work__name {
  font-family: var(--display);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.work__name .tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border: var(--rule);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.work__desc { color: var(--ink-soft); max-width: 46ch; }
.work__arrow { color: var(--muted); font-size: 1rem; transition: transform 0.2s ease, color 0.2s ease; }
.work__item:hover .work__arrow { color: var(--accent); transform: translateX(3px); }

/* --- open-source cards ----------------------------------------------------- */

.cards { display: grid; grid-template-columns: 1fr; gap: 0.85rem; }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }

.card {
  position: relative;
  display: block;
  padding: 1.15rem 1.25rem 1.25rem;
  border: var(--rule);
  border-radius: 13px;
  background: color-mix(in srgb, var(--paper-2) 42%, transparent);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.card:hover {
  background: color-mix(in srgb, var(--paper-2) 85%, transparent);
  border-color: color-mix(in srgb, var(--muted) 38%, var(--hair));
  transform: translateY(-2px);
}
.card__top { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.5rem; padding-right: 1.4rem; }
.card__name { font-family: var(--display); font-weight: 600; font-size: 1.02rem; letter-spacing: -0.012em; }
.card__tag {
  font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted); border: var(--rule); border-radius: 999px;
  padding: 0.1rem 0.5rem; white-space: nowrap;
}
.card__desc { color: var(--ink-soft); font-size: 0.9rem; line-height: 1.5; margin: 0; }
.card__arrow {
  position: absolute; top: 1.1rem; right: 1.15rem;
  color: var(--muted); font-size: 0.95rem;
  transition: color 0.2s ease, transform 0.2s ease;
}
.card:hover .card__arrow { color: var(--accent); transform: translate(2px, -2px); }

/* --- writing list ---------------------------------------------------------- */

.list { display: grid; }
.list a.row {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
  border-top: var(--rule);
}
.list a.row:first-child { border-top: 0; }
.list .row__title { color: var(--ink-soft); transition: color 0.2s ease; }
.list .row:hover .row__title { color: var(--accent); }
.list .row__meta { color: var(--muted); font-size: 0.8rem; white-space: nowrap; font-variant-numeric: tabular-nums; }

/* --- shelf ----------------------------------------------------------------- */

.shelf {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem 2rem;
}
@media (min-width: 720px) { .shelf { grid-template-columns: repeat(4, 1fr); } }
.shelf h3 { font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); font-weight: 500; margin: 0 0 0.7rem; }
.shelf ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.45rem; }
.shelf li { color: var(--ink-soft); font-size: 0.92rem; line-height: 1.4; }
.shelf li span { display: block; color: var(--muted); font-size: 0.78rem; }

/* --- contact / footer ------------------------------------------------------ */

.contact { padding-block: clamp(2.6rem, 6vw, 4rem); border-top: var(--rule); }
.contact h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  letter-spacing: -0.026em;
  margin: 0 0 1.2rem;
}
.contact h2 em { font-style: normal; font-weight: 600; color: var(--accent); }
.links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.6rem; }
.links a { position: relative; color: var(--ink-soft); }
.links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 100%; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform 0.25s ease;
}
.links a:hover { color: var(--accent); }
.links a:hover::after { transform: scaleX(1); }

.colophon {
  border-top: var(--rule);
  padding-block: 1.6rem 3rem;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  color: var(--muted); font-size: 0.78rem;
}

/* --- motion ---------------------------------------------------------------- */

.fade { opacity: 0; transform: translateY(14px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22,1,0.36,1); }
.fade.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .fade { opacity: 1 !important; transform: none !important; transition: none; }
  .pulse { animation: none; }
  * { scroll-behavior: auto !important; }
}

html { scroll-behavior: smooth; }
:target { scroll-margin-top: 5rem; }