:root {
  --ink: #111111;
  --muted: #8a8a8a;
  --faint: #b8b8b8;
  --bg: #ffffff;
  --rule: #ececec;
  --accent: #111111;
  --field: #fff;
  --on-accent: #fff;
  --tile: #f2f1ee;
}
:root[data-theme="dark"] {
  --ink: #ededed;
  --muted: #8d8d8d;
  --faint: #5e5e5e;
  --bg: #0d0d0d;
  --rule: #232323;
  --accent: #ededed;
  --field: #161616;
  --on-accent: #0d0d0d;
  --tile: #161616;
}
html { color-scheme: light dark; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.01em;
}

/* fixed top bar */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.05rem 1.4rem;
  background: var(--bg);
}
.nav .brand { color: var(--ink); text-decoration: none; font-size: 0.92rem; letter-spacing: -0.01em; }
.nav .links { display: flex; gap: 1.4rem; align-items: center; }
.nav a, .nav button {
  color: var(--ink); text-decoration: none; background: none; border: 0;
  font: inherit; font-size: 0.82rem; padding: 0; cursor: pointer; opacity: 0.7;
}
.nav a:hover, .nav button:hover { opacity: 1; }

/* project grid — edge-to-edge, flat square tiles */
main { padding: 3.6rem 1.4rem 0; }
.grid {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem 1.1rem;
}
@media (min-width: 46rem) { .grid { grid-template-columns: repeat(3, 1fr); gap: 1.6rem 1.4rem; } }
@media (min-width: 72rem) { .grid { grid-template-columns: repeat(4, 1fr); } }

.card a { display: block; text-decoration: none; color: inherit; }
.card .thumb { aspect-ratio: 1 / 1; overflow: hidden; background: var(--tile); }
.card .thumb svg, .card .thumb img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1); }
@media (hover: hover) { .card a:hover .thumb svg, .card a:hover .thumb img { transform: scale(1.045); } }

.card .meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.55rem;
  font-size: 0.78rem;
}
.card .name { color: var(--ink); }
.card .cat { color: var(--muted); white-space: nowrap; }

/* footer */
.foot {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 5rem 1.4rem 2rem;
  color: var(--faint);
  font-size: 0.76rem;
}

/* sign-in (login.html) */
.auth { max-width: 30rem; }
.auth h1 { font-size: 1.4rem; font-weight: 500; letter-spacing: -0.01em; margin: 0 0 0.4rem; }
.auth .sub { color: var(--muted); margin: 0 0 1.3rem; font-size: 0.9rem; }
.login { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; max-width: 28rem; }
.login input {
  flex: 1 1 16rem; font: inherit; padding: 0.6rem 0.75rem;
  border: 1px solid var(--rule); border-radius: 0; background: var(--field); color: var(--ink);
}
.login button {
  font: inherit; padding: 0.6rem 1.1rem; border: 0; border-radius: 0;
  background: var(--accent); color: var(--on-accent); cursor: pointer;
}
.login-msg { color: var(--muted); min-height: 1.5em; margin-top: 0.8rem; font-size: 0.85rem; }