/* Instrument Library — one stylesheet, no frameworks.
   Colours live here; change them once and every page follows. */
:root {
  --ink: #1e2a3b;
  --ink-soft: #4a5568;
  --paper: #fbf6ee;
  --card: #ffffff;
  --line: #e6dccb;
  --cane: #e3a54a;      /* reed cane / maple */
  --cane-dark: #a8681f;
  --thread: #2bb3a3;    /* reed thread / filament */
  --thread-dark: #16786d;
  --nc: #b45309;
  --radius: 14px;
  --max: 1120px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--paper); line-height: 1.55; }
a { color: var(--thread-dark); }
a:hover { color: var(--ink); }
img { max-width: 100%; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; background: #fff; padding: 8px; z-index: 10; }

/* Header + nav */
.site-header { background: var(--paper); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand img { width: 40px; height: 40px; }
.brand-name { font-weight: 750; font-size: 1.15rem; letter-spacing: -0.01em; line-height: 1.05; }
.brand-name small { display: block; font-size: 0.68rem; font-weight: 650; letter-spacing: 0.28em; color: var(--cane-dark); }
.nav { display: flex; flex-wrap: wrap; gap: 4px; }
.nav a { text-decoration: none; color: var(--ink); padding: 6px 10px; border-radius: 999px; font-weight: 550; font-size: 0.95rem; }
.nav a:hover { background: #f1e7d6; }
.nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }

/* Hero */
.hero { padding: 56px 0 40px; }
.hero .wrap { display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); line-height: 1.08; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero h1 em { font-style: normal; color: var(--cane-dark); }
.hero p.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 34em; margin: 0 0 24px; }
.hero-art { justify-self: center; width: min(300px, 70vw); }
.hero-art img { width: 100%; display: block; filter: drop-shadow(0 18px 30px rgba(30,42,59,.18)); }
.btns { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 999px; font-weight: 650; text-decoration: none; border: 2px solid var(--ink); background: var(--ink); color: var(--paper); cursor: pointer; font: inherit; font-weight: 650; }
.btn:hover { background: #2d3d55; color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: #f1e7d6; }
.btn.small { padding: 6px 14px; font-size: 0.92rem; }

/* Sections + tiles */
section { padding: 28px 0; }
h2 { font-size: 1.6rem; letter-spacing: -0.01em; margin: 0 0 12px; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-decoration: none; color: var(--ink); display: block; transition: transform .12s, box-shadow .12s; }
a.tile:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(30,42,59,.08); color: var(--ink); }
.tile h3 { margin: 0 0 6px; font-size: 1.2rem; }
.tile p { margin: 0; color: var(--ink-soft); }
.tile .num { font-size: 2.2rem; font-weight: 800; color: var(--cane-dark); line-height: 1; margin-bottom: 6px; }
.layers-rule { height: 10px; margin: 8px 0 0; background: repeating-linear-gradient(to bottom, var(--cane) 0 2px, transparent 2px 4px); opacity: .5; border-radius: 3px; }
.steps { counter-reset: s; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.steps li { counter-increment: s; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 18px 58px; position: relative; }
.steps li::before { content: counter(s); position: absolute; left: 16px; top: 16px; width: 30px; height: 30px; border-radius: 50%; background: var(--thread); color: #fff; font-weight: 800; display: grid; place-items: center; }

/* Page intro */
.page-head { padding: 36px 0 8px; }
.page-head h1 { margin: 0 0 8px; font-size: clamp(1.8rem, 4vw, 2.5rem); letter-spacing: -0.02em; }
.page-head p { margin: 0; color: var(--ink-soft); max-width: 46em; }

/* Filters */
.filters { display: grid; grid-template-columns: 1.2fr 1.4fr 1.4fr 0.9fr auto; gap: 10px; align-items: end; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; margin: 18px 0 10px; }
.filters label { display: block; font-size: 0.78rem; font-weight: 650; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-soft); margin-bottom: 4px; }
.filters input, .filters select { width: 100%; font: inherit; padding: 9px 10px; border: 1px solid #d6cab5; border-radius: 10px; background: #fff; color: var(--ink); }
.filters input:focus, .filters select:focus { outline: 2px solid var(--thread); outline-offset: 1px; }
.result-count { color: var(--ink-soft); font-size: 0.95rem; margin: 6px 0 14px; }
.back-link { font-weight: 650; text-decoration: none; margin-right: 6px; }
/* Category picker (default view of the list pages) */
.cat-picker { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; margin-bottom: 24px; }
.cat-picker[hidden], .cards[hidden] { display: none; }
.cat-tile { display: flex; flex-direction: column; gap: 2px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; text-decoration: none; color: var(--ink); transition: border-color .12s, box-shadow .12s; }
.cat-tile:hover, .cat-tile:focus-visible { border-color: var(--thread); box-shadow: 0 4px 14px rgba(30,42,59,.08); color: var(--ink); }
.cat-name { font-weight: 700; font-size: 1.05rem; line-height: 1.25; }
.cat-count { color: var(--cane-dark); font-size: 0.9rem; font-weight: 600; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 8px; position: relative; overflow: hidden; }
.card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--cane); }
.card .thumb { margin: -18px -18px 0; aspect-ratio: 3 / 2; background: #f3ece0; border-bottom: 1px solid var(--line); overflow: hidden; }
.card .thumb img { display: block; width: 100%; height: 100%; object-fit: cover; }
.card .thumb.placeholder img { object-fit: contain; }
.card .credit { margin: -2px 0 2px; font-size: 0.72rem; color: #7a8394; line-height: 1.35; }
.card::before { z-index: 1; }
.card .kicker { font-size: 0.78rem; font-weight: 650; text-transform: uppercase; letter-spacing: 0.06em; color: var(--cane-dark); }
.card h3 { margin: 0; font-size: 1.08rem; line-height: 1.3; }
.card .by { margin: 0; color: var(--ink-soft); font-size: 0.93rem; }
.card .note { margin: 0; font-size: 0.93rem; }
.card .meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.card .check { font-size: 0.78rem; color: #7a8394; margin: 0; }
.card .actions { margin-top: auto; padding-top: 6px; }
.badge { display: inline-block; font-size: 0.78rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; border: 1px solid; white-space: nowrap; }
.badge.open { color: var(--thread-dark); border-color: #9bd8cf; background: #e9f7f4; }
.badge.nc { color: var(--nc); border-color: #f2c894; background: #fff4e5; }
.badge.plain { color: var(--ink-soft); border-color: var(--line); background: #faf7f1; font-weight: 600; }
.empty { padding: 30px; text-align: center; background: var(--card); border: 1px dashed #d6cab5; border-radius: var(--radius); color: var(--ink-soft); }

/* Wanted page */
.wanted { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; list-style: none; padding: 0; margin: 0; }
.wanted li { background: var(--card); border: 2px dashed #d9c39f; border-radius: var(--radius); padding: 18px; }
.wanted h3 { margin: 0 0 6px; font-size: 1.08rem; }
.wanted p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.wanted .tag { display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--thread-dark); margin-bottom: 4px; }

/* Prose pages */
.prose { max-width: 46em; }
.prose h2 { margin-top: 30px; font-size: 1.35rem; }
.callout { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--thread); border-radius: 10px; padding: 14px 18px; margin: 18px 0; }
.near-miss { font-size: 0.95rem; }
.near-miss li { margin-bottom: 6px; }

/* Footer */
.site-footer { margin-top: 40px; border-top: 1px solid var(--line); padding: 26px 0 40px; color: var(--ink-soft); font-size: 0.9rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between; }
.site-footer p { margin: 0; max-width: 44em; }

@media (max-width: 1119px) {
  /* Below full width the five-across filter row would truncate option text. */
  .filters { grid-template-columns: 1fr 1fr; }
  .filters .f-search { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero { padding-top: 32px; }
  .hero-art { order: -1; width: 140px; justify-self: start; }
}
@media (max-width: 600px) {
  /* Category, then licence, each on its own full-width row so long names and counts fit;
     commercial-use shares the last row with Clear. */
  .filters { grid-template-columns: 1fr auto; }
  .filters > div:nth-child(-n+3) { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .site-header .wrap { padding-left: 12px; padding-right: 12px; }
  .brand-name { font-size: 1rem; }
  .nav { gap: 0; width: 100%; justify-content: space-between; }
  .nav a { padding: 5px 8px; font-size: 0.88rem; }
  .nav a:first-child { display: none; } /* the logo already links home */
  .cat-picker { grid-template-columns: 1fr 1fr; gap: 8px; }
  .cat-tile { padding: 12px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }