/* ragx PWA. Direction A: terminal calm. Dark first, green accent, code first type. All colours are tokens; no inline styles anywhere (strict CSP). */
:root {
  --sans: "Fira Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Fira Code", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --bg: #020617; --card: #0e1223; --muted: #1a1e2f; --fg: #f8fafc; --fg2: #94a3b8; --border: #334155;
  --accent: #22c55e; --on-accent: #0f172a; --danger: #f87171; --warn: #fbbf24; --focus: #ffffff;
  --r: 10px; --tap: 44px; --tabs-h: 64px;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f8fafc; --card: #ffffff; --muted: #eef2f7; --fg: #0f172a; --fg2: #475569; --border: #cbd5e1;
  --accent: #15803d; --on-accent: #ffffff; --danger: #b91c1c; --warn: #92400e; --focus: #0f172a;
  color-scheme: light;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* author display rules (nav, dialog) must not defeat the hidden attribute */
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 var(--sans); min-height: 100dvh; display: flex; flex-direction: column; }
.shell { flex: 1; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: 1.15rem; } h2 { font-size: 1.1rem; } h3 { font-size: 1rem; }
a { color: var(--accent); }
code, pre, .mono { font-family: var(--mono); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--on-accent); padding: .6rem 1rem; z-index: 50; }
.skip:focus { left: 8px; top: 8px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.top { display: flex; align-items: center; gap: .75rem; padding: .6rem 1rem; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--bg); z-index: 5; }
.top h1 { margin: 0; flex: 1; font-family: var(--mono); }
.who { color: var(--fg2); font-size: .85rem; }
#banner { padding: .6rem 1rem; background: var(--muted); border-bottom: 1px solid var(--warn); color: var(--fg); font-size: .9rem; }
main { padding: 1rem 1rem calc(var(--tabs-h) + 1rem); width: 100%; max-width: 760px; margin: 0 auto; outline: none; }
main.chat { display: flex; flex-direction: column; padding-bottom: calc(var(--tabs-h) + 8.5rem); }

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
.btn { min-height: var(--tap); min-width: var(--tap); padding: 0 1rem; border-radius: var(--r); border: 1px solid var(--border); background: var(--muted); display: inline-flex; align-items: center; justify-content: center; gap: .5rem; transition: background .15s, border-color .15s; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 600; }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.icon { padding: 0; width: var(--tap); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.btn.small { min-height: 36px; min-width: 36px; padding: 0 .6rem; font-size: .9rem; }
svg.i { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
svg.i.flip { transform: rotate(180deg); }
.field { display: grid; gap: .3rem; margin-bottom: .9rem; }
.field label { font-size: .9rem; color: var(--fg2); }
.input { min-height: var(--tap); padding: .5rem .75rem; border-radius: var(--r); border: 1px solid var(--border); background: var(--card); width: 100%; }
.err { color: var(--danger); font-size: .9rem; min-height: 1.2em; }
.note { color: var(--fg2); font-size: .9rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--r); padding: .9rem 1rem; margin-bottom: .75rem; }
.row { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.row.space { justify-content: space-between; }
.grid { display: grid; gap: .75rem; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: var(--r); padding: .75rem; }
.stat b { display: block; font: 600 1.4rem var(--mono); }
.stat span { color: var(--fg2); font-size: .85rem; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .5rem .4rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--fg2); font-weight: 500; }
.tablewrap { overflow-x: auto; }
td.num, th.num { text-align: right; font-family: var(--mono); }
.pill { display: inline-block; padding: .1rem .55rem; border-radius: 999px; border: 1px solid var(--border); font-size: .8rem; color: var(--fg2); }
.pill.ok { border-color: var(--accent); color: var(--accent); }
.pill.warn { border-color: var(--warn); color: var(--warn); }

/* chat */
.log { display: flex; flex-direction: column; gap: .9rem; flex: 1; }
.msg.user { align-self: flex-end; max-width: 88%; background: var(--muted); border-radius: var(--r); padding: .6rem .85rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg .who { font-size: .75rem; color: var(--fg2); font-family: var(--mono); display: block; margin-bottom: .15rem; }
.answer { background: var(--card); border: 1px solid var(--border); border-radius: var(--r); padding: .9rem 1rem; overflow-wrap: anywhere; }
.answer.refusal { border-color: var(--warn); }
.answer p { margin: 0 0 .65rem; } .answer ul { margin: 0 0 .65rem 1.2rem; padding: 0; }
.answer :not(pre) > code { background: var(--muted); padding: .05rem .3rem; border-radius: 4px; font-size: .9em; }
.code { position: relative; margin: 0 0 .75rem; }
.code pre { margin: 0; padding: 2.4rem .8rem .8rem; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; overflow-x: auto; font-size: .85rem; line-height: 1.45; }
.code .copy { position: absolute; top: .4rem; right: .4rem; }
.cite { min-width: 28px; min-height: 28px; padding: 0 .35rem; margin: 0 1px; border: 1px solid var(--accent); background: transparent; color: var(--accent); border-radius: 6px; font: .8rem var(--mono); }
.chips { display: flex; flex-wrap: wrap; gap: .4rem; margin: .5rem 0; }
.chip { min-height: 36px; padding: .2rem .7rem; border-radius: 999px; border: 1px solid var(--border); background: var(--muted); font-size: .85rem; text-align: left; }
.chip:hover { border-color: var(--accent); }
.meta { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; margin-top: .6rem; }
details.why { margin-top: .5rem; color: var(--fg2); font-size: .9rem; }
details.why summary { cursor: pointer; min-height: 32px; display: flex; align-items: center; }
details.why ul { margin: .3rem 0 0 1.2rem; padding: 0; }
.thinking::after { content: ""; display: inline-block; width: .5em; height: 1em; background: var(--accent); margin-left: .3rem; vertical-align: text-bottom; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.empty { text-align: center; color: var(--fg2); padding: 2rem 0 1rem; }
.composer { position: fixed; left: 0; right: 0; bottom: calc(var(--tabs-h) + env(safe-area-inset-bottom)); background: var(--bg); border-top: 1px solid var(--border); padding: .6rem 1rem .6rem; z-index: 6; }
.composer .inner { max-width: 760px; margin: 0 auto; display: grid; gap: .5rem; }
.composer textarea { min-height: var(--tap); max-height: 8rem; resize: none; flex: 1; overflow-y: auto; }
main:focus, main:focus-visible { outline: none; } /* main is only focused by script after a route change, so a ring there is noise */
.preview { display: flex; align-items: center; gap: .6rem; }
.preview img { max-height: 56px; border-radius: 6px; border: 1px solid var(--border); }
.rec { color: var(--danger); font-weight: 600; }
.rec .dot { display: inline-block; width: .6rem; height: .6rem; border-radius: 50%; background: var(--danger); margin-right: .4rem; animation: blink 1s steps(2) infinite; }

/* nav */
nav.tabs { position: fixed; left: 0; right: 0; bottom: 0; height: calc(var(--tabs-h) + env(safe-area-inset-bottom)); padding-bottom: env(safe-area-inset-bottom); background: var(--bg); border-top: 1px solid var(--border); display: flex; z-index: 7; }
nav.tabs a { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; color: var(--fg2); text-decoration: none; font-size: .75rem; min-height: var(--tap); }
nav.tabs a[aria-current="page"] { color: var(--accent); }
.subnav { display: flex; gap: .4rem; margin-bottom: 1rem; flex-wrap: wrap; }
.subnav a { min-height: 36px; display: inline-flex; align-items: center; padding: 0 .8rem; border-radius: 999px; border: 1px solid var(--border); color: var(--fg); text-decoration: none; }
.subnav a[aria-current="page"] { border-color: var(--accent); color: var(--accent); }

dialog { background: var(--card); color: var(--fg); border: 1px solid var(--border); border-radius: 14px; padding: 1rem; width: min(560px, 94vw); max-height: 86dvh; }
dialog::backdrop { background: rgba(2, 6, 23, .7); }
dialog pre { white-space: pre-wrap; overflow-wrap: anywhere; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: .7rem; font-size: .85rem; max-height: 45dvh; overflow: auto; }

@media (min-width: 900px) {
  .shell { display: grid; grid-template-columns: 88px 1fr; }
  .shell:has(> nav[hidden]) { grid-template-columns: 1fr; } /* signed out: no nav, so main must not fall into the 88px nav column */
  nav.tabs { position: static; flex-direction: column; justify-content: flex-start; padding-top: 1rem; height: auto; border-top: 0; border-right: 1px solid var(--border); gap: .5rem; }
  nav.tabs a { flex: none; min-height: 64px; }
  main { padding-bottom: 2rem; }
  main.chat { padding-bottom: 9rem; }
  .composer { left: 88px; bottom: 0; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }
@media (forced-colors: active) { .btn, .chip, .cite, .card, .answer { border: 1px solid CanvasText; } }