/* ============================================================
   Open Essential Medicines · DrugAtlas.ai
   Design system — tokens, type, components, light/dark
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400;1,6..72,500&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

/* ---------- Tokens: light (default) ---------- */
:root {
  /* neutrals — cool paper */
  --bg:          oklch(0.985 0.003 255);
  --bg-2:        oklch(0.965 0.004 255);
  --surface:     oklch(1 0 0);
  --surface-2:   oklch(0.975 0.004 255);
  --border:      oklch(0.915 0.005 255);
  --border-2:    oklch(0.855 0.007 255);
  --ink:         oklch(0.255 0.014 260);
  --ink-2:       oklch(0.44 0.013 260);
  --ink-3:       oklch(0.585 0.011 260);
  --ink-faint:   oklch(0.72 0.008 260);

  /* anchor — deep civic blue */
  --anchor:      oklch(0.485 0.135 260);
  --anchor-press:oklch(0.41 0.14 260);
  --anchor-ink:  oklch(0.43 0.14 260);
  --anchor-soft: oklch(0.955 0.028 260);
  --anchor-line: oklch(0.86 0.05 260);
  --on-anchor:   oklch(0.99 0.005 260);

  /* supply-risk scale (colorblind-safe; hue + lightness vary) */
  --risk-available:   oklch(0.66 0.10 200);
  --risk-available-bg:oklch(0.95 0.035 200);
  --risk-single-src:  oklch(0.79 0.13 85);
  --risk-single-src-bg:oklch(0.955 0.05 85);
  --risk-single-ctry: oklch(0.685 0.16 48);
  --risk-single-ctry-bg:oklch(0.95 0.05 48);
  --risk-blocked:     oklch(0.55 0.19 352);
  --risk-blocked-bg:  oklch(0.95 0.04 352);
  --risk-unknown:     oklch(0.70 0.008 260);
  --risk-unknown-bg:  oklch(0.95 0.004 260);

  /* fonts */
  --serif: 'Newsreader', Georgia, serif;
  --sans:  'IBM Plex Sans', system-ui, sans-serif;
  --mono:  'IBM Plex Mono', ui-monospace, monospace;

  /* shape */
  --r-sm: 4px; --r: 7px; --r-lg: 11px; --r-xl: 18px;
  --shadow-1: 0 1px 2px oklch(0.4 0.03 260 / 0.06), 0 1px 1px oklch(0.4 0.03 260 / 0.04);
  --shadow-2: 0 4px 14px oklch(0.4 0.03 260 / 0.08), 0 1px 3px oklch(0.4 0.03 260 / 0.06);
  --shadow-pop: 0 10px 34px oklch(0.3 0.04 260 / 0.16), 0 2px 8px oklch(0.3 0.04 260 / 0.10);

  --maxw: 1200px;
  --hatch: repeating-linear-gradient(45deg, transparent 0 5px, oklch(0.5 0.04 260 / 0.05) 5px 6px);
}

/* ---------- Tokens: dark ---------- */
[data-theme="dark"] {
  --bg:          oklch(0.175 0.014 262);
  --bg-2:        oklch(0.205 0.015 262);
  --surface:     oklch(0.215 0.015 262);
  --surface-2:   oklch(0.245 0.016 262);
  --border:      oklch(0.31 0.016 262);
  --border-2:    oklch(0.40 0.018 262);
  --ink:         oklch(0.945 0.006 258);
  --ink-2:       oklch(0.76 0.012 258);
  --ink-3:       oklch(0.62 0.013 258);
  --ink-faint:   oklch(0.50 0.012 258);

  --anchor:      oklch(0.72 0.12 258);
  --anchor-press:oklch(0.80 0.11 258);
  --anchor-ink:  oklch(0.78 0.12 258);
  --anchor-soft: oklch(0.30 0.05 260);
  --anchor-line: oklch(0.42 0.07 260);
  --on-anchor:   oklch(0.16 0.02 260);

  --risk-available:   oklch(0.74 0.11 200);
  --risk-available-bg:oklch(0.30 0.05 200);
  --risk-single-src:  oklch(0.82 0.13 85);
  --risk-single-src-bg:oklch(0.33 0.06 85);
  --risk-single-ctry: oklch(0.74 0.15 48);
  --risk-single-ctry-bg:oklch(0.33 0.07 48);
  --risk-blocked:     oklch(0.68 0.18 352);
  --risk-blocked-bg:  oklch(0.32 0.08 352);
  --risk-unknown:     oklch(0.66 0.01 260);
  --risk-unknown-bg:  oklch(0.30 0.006 260);

  --shadow-1: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-2: 0 4px 14px oklch(0 0 0 / 0.4);
  --shadow-pop: 0 12px 38px oklch(0 0 0 / 0.55);
  --hatch: repeating-linear-gradient(45deg, transparent 0 5px, oklch(0.8 0.04 260 / 0.06) 5px 6px);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .25s ease, color .25s ease;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--anchor-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
:focus-visible { outline: 2.5px solid var(--anchor); outline-offset: 2px; border-radius: 3px; }
::selection { background: var(--anchor-soft); }

/* ---------- Typography ---------- */
.display {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.018em;
  font-size: clamp(2.6rem, 5.6vw, 4.6rem);
  color: var(--ink);
  text-wrap: balance;
}
.display em { font-style: italic; font-weight: 500; color: var(--anchor-ink); }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.012em; line-height: 1.12; text-wrap: balance; }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
h3 { font-size: 1.3rem; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.lede { font-size: 1.22rem; line-height: 1.55; color: var(--ink-2); text-wrap: pretty; }
.muted { color: var(--ink-3); }
.mono { font-family: var(--mono); }
.tnum { font-variant-numeric: tabular-nums; }
small, .small { font-size: 0.82rem; }

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: 28px; }
.wrap-narrow { max-width: 880px; margin-inline: auto; padding-inline: 28px; }
section { position: relative; }
.divider { border: 0; border-top: 1px solid var(--border); margin: 0; }
.stack > * + * { margin-top: var(--gap, 1rem); }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 60;
  background: color-mix(in oklch, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner { display: flex; align-items: center; gap: 24px; height: 62px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .mark { flex: none; }
.brand small { display: block; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a { padding: 7px 11px; border-radius: var(--r); color: var(--ink-2); font-size: 0.92rem; font-weight: 500; }
.nav a:hover { background: var(--surface-2); color: var(--ink); text-decoration: none; }
.nav a.active { color: var(--anchor-ink); background: var(--anchor-soft); }
.icon-btn { display: grid; place-items: center; width: 38px; height: 38px; border-radius: var(--r); border: 1px solid var(--border); color: var(--ink-2); background: var(--surface); }
.icon-btn:hover { color: var(--ink); border-color: var(--border-2); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: var(--r);
  font-weight: 600; font-size: 0.95rem; letter-spacing: -0.005em;
  border: 1px solid transparent; transition: all .14s ease; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--anchor); color: var(--on-anchor); box-shadow: var(--shadow-1); }
.btn-primary:hover { background: var(--anchor-press); }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--border-2); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--ink-faint); }
.btn-sm { padding: 7px 13px; font-size: 0.86rem; }
.btn-lg { padding: 14px 24px; font-size: 1.02rem; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
}
.card-pad { padding: 22px; }

/* ---------- Pills / tags ---------- */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.02em;
  padding: 3px 9px; border-radius: 100px; border: 1px solid var(--border-2);
  color: var(--ink-2); background: var(--surface-2); white-space: nowrap;
}
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 500;
  padding: 3px 10px; border-radius: var(--r-sm);
  border: 1px solid var(--anchor-line); color: var(--anchor-ink); background: var(--anchor-soft);
}

/* ---------- Supply-risk badges ---------- */
.risk {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 0.73rem; font-weight: 500; letter-spacing: 0.01em;
  padding: 3px 10px 3px 8px; border-radius: 100px;
  border: 1px solid var(--rk-line, var(--border-2));
  color: var(--rk-ink, var(--ink-2)); background: var(--rk-bg, var(--surface-2));
  white-space: nowrap;
}
.risk .glyph { width: 11px; height: 11px; flex: none; }
.risk--available   { --rk-ink: color-mix(in oklch, var(--risk-available) 72%, var(--ink)); --rk-bg: var(--risk-available-bg); --rk-line: color-mix(in oklch, var(--risk-available) 40%, var(--border)); }
.risk--single-src  { --rk-ink: color-mix(in oklch, var(--risk-single-src) 64%, var(--ink)); --rk-bg: var(--risk-single-src-bg); --rk-line: color-mix(in oklch, var(--risk-single-src) 40%, var(--border)); }
.risk--single-ctry { --rk-ink: color-mix(in oklch, var(--risk-single-ctry) 70%, var(--ink)); --rk-bg: var(--risk-single-ctry-bg); --rk-line: color-mix(in oklch, var(--risk-single-ctry) 42%, var(--border)); }
.risk--blocked     { --rk-ink: color-mix(in oklch, var(--risk-blocked) 80%, var(--ink)); --rk-bg: var(--risk-blocked-bg); --rk-line: color-mix(in oklch, var(--risk-blocked) 42%, var(--border)); }
.risk--unknown     { --rk-ink: var(--ink-3); --rk-bg: var(--risk-unknown-bg); --rk-line: var(--border-2); }

/* risk dot for inline use */
.rdot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; flex: none; vertical-align: middle; }
.rdot--available   { background: var(--risk-available); }
.rdot--single-src  { background: var(--risk-single-src); }
.rdot--single-ctry { background: var(--risk-single-ctry); }
.rdot--blocked     { background: var(--risk-blocked); }
.rdot--unknown     { background: var(--risk-unknown); border: 1px dashed var(--ink-faint); width: 11px; height: 11px; }

/* ---------- Provenance chip + popover ---------- */
.prov {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--mono); font-size: 0.66rem; font-weight: 500;
  padding: 1px 6px 1px 5px; border-radius: 5px;
  border: 1px solid var(--border-2); color: var(--ink-3); background: var(--surface-2);
  cursor: pointer; vertical-align: baseline; transition: all .12s ease; line-height: 1.4;
}
.prov:hover { color: var(--anchor-ink); border-color: var(--anchor-line); background: var(--anchor-soft); }
.prov svg { width: 10px; height: 10px; flex: none; }
.prov .conf { display: inline-flex; gap: 1.5px; align-items: center; }
.prov .conf i { width: 2.5px; height: 8px; border-radius: 1px; background: var(--ink-faint); display: inline-block; }
.prov .conf i.on { background: var(--anchor); }
.prov[data-computed="1"] { border-style: dashed; }

.prov-pop {
  position: fixed; z-index: 200; width: 320px; max-width: calc(100vw - 24px);
  background: var(--surface); border: 1px solid var(--border-2);
  border-radius: var(--r-lg); box-shadow: var(--shadow-pop); padding: 0;
  opacity: 0; transform: translateY(4px); pointer-events: none;
  transition: opacity .14s ease, transform .14s ease;
}
.prov-pop.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
.prov-pop header { display: flex; align-items: center; gap: 8px; padding: 12px 14px; border-bottom: 1px solid var(--border); }
.prov-pop header .st { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; padding: 2px 7px; border-radius: 4px; background: var(--anchor-soft); color: var(--anchor-ink); border: 1px solid var(--anchor-line); }
.prov-pop header .st[data-k="computed"] { background: var(--risk-single-ctry-bg); color: color-mix(in oklch,var(--risk-single-ctry) 70%,var(--ink)); border-color: color-mix(in oklch,var(--risk-single-ctry) 40%,var(--border)); }
.prov-pop .excerpt { padding: 12px 14px; font-size: 0.86rem; color: var(--ink); line-height: 1.5; }
.prov-pop .excerpt .ref { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-3); display: block; margin-top: 6px; }
.prov-pop .meta { padding: 0 14px 12px; display: grid; grid-template-columns: auto 1fr; gap: 5px 14px; font-size: 0.78rem; }
.prov-pop .meta dt { color: var(--ink-3); font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.03em; }
.prov-pop .meta dd { color: var(--ink); text-align: right; }
.prov-pop .confbar { height: 5px; border-radius: 3px; background: var(--surface-2); overflow: hidden; margin-top: 3px; border: 1px solid var(--border); }
.prov-pop .confbar i { display: block; height: 100%; background: var(--anchor); }
.prov-pop footer { padding: 11px 14px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.prov-pop footer a { font-size: 0.8rem; font-weight: 600; display: inline-flex; align-items: center; gap: 5px; }
.prov-pop footer .lic { font-family: var(--mono); font-size: 0.66rem; color: var(--ink-3); }

/* ---------- Forms / search ---------- */
.search {
  display: flex; align-items: center; gap: 11px;
  background: var(--surface); border: 1.5px solid var(--border-2);
  border-radius: var(--r-lg); padding: 0 16px; height: 56px;
  box-shadow: var(--shadow-1); transition: border-color .14s ease, box-shadow .14s ease;
}
.search:focus-within { border-color: var(--anchor); box-shadow: 0 0 0 4px var(--anchor-soft); }
.search svg { color: var(--ink-3); flex: none; }
.search input { flex: 1; border: 0; background: none; font-size: 1.05rem; color: var(--ink); height: 100%; }
.search input::placeholder { color: var(--ink-faint); }
.search input:focus { outline: none; }
.search kbd { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); border: 1px solid var(--border-2); border-radius: 4px; padding: 2px 6px; background: var(--surface-2); }

.field { width: 100%; height: 42px; padding: 0 13px; border: 1px solid var(--border-2); border-radius: var(--r); background: var(--surface); color: var(--ink); font-size: 0.92rem; }
.field:focus { outline: none; border-color: var(--anchor); box-shadow: 0 0 0 3px var(--anchor-soft); }

/* segmented control / filter chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--mono); font-size: 0.76rem; font-weight: 500; letter-spacing: 0.01em;
  padding: 6px 13px; border-radius: 100px; border: 1px solid var(--border-2);
  color: var(--ink-2); background: var(--surface); display: inline-flex; align-items: center; gap: 7px; transition: all .12s ease;
}
.chip:hover { border-color: var(--ink-faint); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--anchor); color: var(--on-anchor); border-color: var(--anchor); }
.chip[aria-pressed="true"] .rdot { box-shadow: 0 0 0 1.5px var(--on-anchor); }

/* ---------- Table ---------- */
.tbl { width: 100%; border-collapse: collapse; }
.tbl th { text-align: left; font-family: var(--mono); font-size: 0.68rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); padding: 11px 14px; border-bottom: 1px solid var(--border-2); }
.tbl td { padding: 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.tbl tbody tr { transition: background-color .12s ease; }
.tbl tbody tr:hover { background: var(--surface-2); }
.tbl tbody tr:last-child td { border-bottom: 0; }

/* ---------- Misc utilities ---------- */
.flex { display: flex; }
.between { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.center { display: flex; align-items: center; gap: 10px; }
.grid { display: grid; gap: 20px; }
.wfull { width: 100%; }
.us-flag { display: inline-flex; align-items: center; gap: 5px; font-family: var(--mono); font-size: 0.7rem; font-weight: 500; color: var(--anchor-ink); padding: 2px 8px; border-radius: 4px; background: var(--anchor-soft); border: 1px solid var(--anchor-line); }

/* documented vs proposed treatment */
.proposed { background-image: var(--hatch); }
.proposed-tag { font-family: var(--mono); font-size: 0.66rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: color-mix(in oklch,var(--risk-single-ctry) 66%,var(--ink)); display: inline-flex; align-items: center; gap: 5px; }

/* footer */
.footer { background: var(--bg-2); border-top: 1px solid var(--border); margin-top: 80px; }
.footer-inner { padding: 54px 0 40px; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.footer h4 { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; margin-bottom: 14px; }
.footer ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.footer a { color: var(--ink-2); font-size: 0.9rem; }
.footer a:hover { color: var(--anchor-ink); }
.footer-bottom { border-top: 1px solid var(--border); padding: 22px 0; display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; font-size: 0.82rem; color: var(--ink-3); }

@media (max-width: 860px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .nav .hide-sm { display: none; }
}
@media (max-width: 560px) {
  .footer-inner { grid-template-columns: 1fr; }
  .wrap, .wrap-narrow { padding-inline: 18px; }
}

/* ---------- Supply-chain graph ---------- */
.scg-root { position: relative; }
.scg-scroll { overflow: auto; padding: 2px; }
.scg-canvas { position: relative; }
.scg-edges { position: absolute; inset: 0; pointer-events: none; }
.scg-edges path { transition: stroke .15s ease, stroke-width .15s ease, opacity .15s ease; }
.scg-node {
  position: absolute; display: flex; align-items: center; gap: 10px;
  text-align: left; padding: 9px 11px 9px 14px;
  background: var(--surface); border: 1px solid var(--border-2); border-radius: var(--r);
  box-shadow: var(--shadow-1); transition: transform .14s ease, box-shadow .14s ease, opacity .15s ease, border-color .14s ease;
  --rk: var(--risk-unknown);
}
.scg-node .scg-risk { position: absolute; left: 0; top: 0; bottom: 0; width: 4px; border-radius: var(--r) 0 0 var(--r); background: var(--rk); }
.scg-node .scg-body { flex: 1; min-width: 0; }
.scg-node .scg-label { display: block; font-weight: 600; font-size: 0.92rem; letter-spacing: -0.01em; color: var(--ink); line-height: 1.2; }
.scg-node .scg-sub { display: block; font-size: 0.72rem; color: var(--ink-3); line-height: 1.25; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.scg-node .glyph { width: 13px; height: 13px; flex: none; }
.scg-node.rk-available    { --rk: var(--risk-available); }
.scg-node.rk-single-src   { --rk: var(--risk-single-src); }
.scg-node.rk-single-ctry  { --rk: var(--risk-single-ctry); }
.scg-node.rk-blocked      { --rk: var(--risk-blocked); border-color: color-mix(in oklch, var(--risk-blocked) 38%, var(--border-2)); }
.scg-node.is-api { background: var(--anchor-soft); border-color: var(--anchor-line); }
.scg-node.is-api .scg-label { color: var(--anchor-ink); font-family: var(--serif); font-size: 1.05rem; font-weight: 600; }
.scg-node.hov { transform: translateY(-1px); box-shadow: var(--shadow-2); border-color: var(--ink-faint); }
.scg-node.sel { border-color: var(--rk); box-shadow: 0 0 0 2px var(--rk), var(--shadow-2); transform: translateY(-1px); }
.scg-node.is-api.sel { box-shadow: 0 0 0 2px var(--anchor), var(--shadow-2); }
.scg-node.dim { opacity: 0.4; }

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