/* Frostline Lab — site stylesheet
   One file, no webfonts, no frameworks. Light first, dark supported. */

:root {
  --bg: #f6f8fb;
  --bg-soft: #eef3f9;
  --surface: #ffffff;
  --surface-2: #f9fbfd;
  --text: #0f1722;
  --text-soft: #55637a;
  --text-faint: #8794a8;
  --line: #e2e9f1;
  --line-strong: #cfdae7;
  --brand: #2e6be6;
  --brand-soft: #e9f0fd;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 10px 28px -20px rgba(15, 23, 42, 0.25);
  --maxw: 1060px;
  --font: ui-sans-serif, -apple-system, "SF Pro Text", "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0b1119;
  --bg-soft: #101823;
  --surface: #121b26;
  --surface-2: #16202c;
  --text: #e6edf6;
  --text-soft: #a3b1c4;
  --text-faint: #7b8a9e;
  --line: #1f2b3a;
  --line-strong: #2c3a4c;
  --brand: #6f9dff;
  --brand-soft: #17233a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 30px -22px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1119;
    --bg-soft: #101823;
    --surface: #121b26;
    --surface-2: #16202c;
    --text: #e6edf6;
    --text-soft: #a3b1c4;
    --text-faint: #7b8a9e;
    --line: #1f2b3a;
    --line-strong: #2c3a4c;
    --brand: #6f9dff;
    --brand-soft: #17233a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 30px -22px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  z-index: 50;
}
.skip-link:focus { left: 12px; top: 12px; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(14px) saturate(1.5);
  -webkit-backdrop-filter: blur(14px) saturate(1.5);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--text);
  font-weight: 650;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
/* The org mark is a dark tile with transparent corners, so it needs no plate of
   its own in either theme — it reads on the light and the dark header alike. */
.brand__mark { display: block; width: 24px; height: 24px; border-radius: 6px; }
.brand__name small {
  display: block;
  font-weight: 450;
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  font-size: 14.5px;
}
.nav a {
  color: var(--text-soft);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}
.nav a:hover { color: var(--text); background: var(--bg-soft); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

.lang-toggle {
  margin-left: 6px;
  font: inherit;
  font-size: 13px;
  color: var(--text-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
}
.lang-toggle:hover { border-color: var(--line-strong); color: var(--text); }

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

.hero { padding: 68px 0 40px; }

.eyebrow {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 14px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  font-weight: 700;
  max-width: 18ch;
}

.lede {
  margin: 0 0 26px;
  max-width: 60ch;
  font-size: 17px;
  color: var(--text-soft);
}

.actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: inherit;
  font-size: 14px;
  line-height: 1;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}
.btn:hover { text-decoration: none; border-color: var(--text-faint); }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
  font-weight: 550;
}
.btn--primary:hover { border-color: var(--text); opacity: 0.9; }

.btn--quiet {
  border-color: transparent;
  background: transparent;
  color: var(--text-soft);
  padding: 7px 11px;
}
.btn--quiet:hover { background: var(--bg-soft); color: var(--text); }

.btn[aria-pressed="true"] {
  background: var(--brand-soft);
  border-color: var(--brand);
  color: var(--brand);
}

.btn--disabled {
  color: var(--text-faint);
  border-style: dashed;
  cursor: default;
  background: transparent;
}
.btn--disabled:hover { border-color: var(--line-strong); }

.btn--small { font-size: 13px; padding: 7px 12px; }

/* ---------- section headings ---------- */

.section { padding: 34px 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: 18px;
}
.section__head h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.section__note {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-faint);
}

/* ---------- channel band ---------- */

.band {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 26px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 26px 26px 30px;
  overflow: hidden;
}
.band::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--accent, var(--brand));
}
.band__logo { width: 34px; height: 34px; margin-bottom: 12px; }
.band h2 {
  margin: 0 0 10px;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.band p { margin: 0 0 4px; color: var(--text-soft); max-width: 54ch; }
.band__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding-left: 26px;
  border-left: 1px solid var(--line);
}
.band__kicker {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
}

@media (max-width: 720px) {
  .band { grid-template-columns: 1fr; padding: 22px; }
  .band__aside { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); padding-top: 16px; }
}

/* ---------- project cards ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(288px, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }

.card__banner {
  display: block;
  aspect-ratio: 16 / 9;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
.card__banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card__fav {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-faint);
  cursor: pointer;
}
.card__fav:hover { color: var(--text); border-color: var(--line-strong); }
.card__fav svg { width: 17px; height: 17px; display: block; }
.card__fav[aria-pressed="true"] { color: #e5484d; border-color: color-mix(in srgb, #e5484d 45%, var(--line)); }
.card__fav[aria-pressed="true"] svg { fill: currentColor; }

.card__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px 18px;
  flex: 1;
}

.card__head { display: flex; align-items: center; gap: 10px; }
.card__logo { width: 28px; height: 28px; flex: 0 0 auto; }
.card__name { margin: 0; font-size: 17.5px; font-weight: 650; letter-spacing: -0.01em; }
.card__name a { color: var(--text); }
.card__tagline { margin: 0; font-size: 14.5px; color: var(--text-soft); }
.card__tagline em { font-style: normal; color: var(--text-faint); }

.card__desc {
  margin: 0;
  font-size: 13.8px;
  color: var(--text-soft);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; padding-top: 4px; }

.badge {
  font-size: 11.5px;
  font-family: var(--mono);
  color: var(--text-soft);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 9px;
  white-space: nowrap;
}
.badge--status::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  margin-right: 6px;
  vertical-align: 1px;
  background: var(--accent, var(--brand));
}
.badge--quiet { color: var(--text-faint); }

.card__links { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- gallery toolbar ---------- */

.toolbar {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 22px;
}

.toolbar__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.toolbar__row--wrap { gap: 8px; }

.search {
  position: relative;
  flex: 1 1 260px;
  min-width: 200px;
}
.search input {
  width: 100%;
  font: inherit;
  font-size: 14.5px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 15px 9px 36px;
}
.search input::placeholder { color: var(--text-faint); }
.search input:focus { outline: none; border-color: var(--brand); background: var(--surface); }
.search svg {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--text-faint);
  pointer-events: none;
}

.field {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-faint);
}
.field select {
  font: inherit;
  font-size: 13.5px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 11px;
  cursor: pointer;
}

.results {
  font-size: 13px;
  color: var(--text-faint);
  margin-left: auto;
  white-space: nowrap;
}

.chip {
  font: inherit;
  font-size: 13px;
  color: var(--text-soft);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.chip:hover { border-color: var(--line-strong); color: var(--text); }
.chip[aria-pressed="true"] {
  background: var(--brand-soft);
  border-color: color-mix(in srgb, var(--brand) 40%, var(--line));
  color: var(--brand);
  font-weight: 550;
}

.group-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-right: 2px;
}

/* ---------- misc ---------- */

.empty {
  padding: 46px 22px;
  text-align: center;
  color: var(--text-soft);
  background: var(--surface);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
}
.empty p { margin: 0 0 14px; }

.about {
  max-width: 68ch;
  color: var(--text-soft);
}
.about h2 {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 0 0 12px;
}
.about p { margin: 0 0 12px; }

.site-footer {
  margin-top: 46px;
  border-top: 1px solid var(--line);
  padding: 26px 0 40px;
  font-size: 13.5px;
  color: var(--text-faint);
}
.site-footer .footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  align-items: center;
}
.site-footer nav { display: flex; gap: 14px; }
.site-footer .spacer { margin-left: auto; }

/* ---------- utilities ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.lang-toggle--icon {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: default;
  transform: none;
}

.hero--compact { padding: 46px 0 26px; }
.hero--compact h1 { max-width: none; }

/* Marks the card a deep link landed on, so a reader arriving from a README can see
   which project sent them here. No animation, so it also survives reduced-motion;
   it clears on the next re-render like any other view state. */
.card--target { outline: 2px solid var(--accent, var(--brand)); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}