/* === T01 === base.css — reset, type scale, shell layout (COMPOSED S5 "Layout"), focus rings,
   reduced motion, header/banner/dock/placeholder. Component and screen styles live elsewhere. */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  font-size: var(--fs-3);                 /* body 17 (16 below 768 px) */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 8px);
}
@media (max-width: 767.98px) { html { font-size: 16px; } }

body {
  min-height: 100dvh;
  padding-inline: var(--gutter);          /* the one side gutter, every width */
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}

img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
[hidden] { display: none !important; }
code, kbd, pre, .mono, .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.num { font-feature-settings: "tnum"; }
table { border-collapse: collapse; }
.table-wrap { overflow-x: auto; max-width: 100%; }

/* type scale 13/15/17/22/28/40 */
h1, .fs-5 { font-size: var(--fs-5); line-height: 1.15; font-weight: 700; letter-spacing: -.01em; }
h2, .fs-4 { font-size: var(--fs-4); line-height: 1.2; font-weight: 650; letter-spacing: -.005em; }
h3, .fs-3 { font-size: var(--fs-3); line-height: 1.35; font-weight: 650; }
.fs-6 { font-size: var(--fs-6); line-height: 1.05; font-weight: 700; letter-spacing: -.02em; }
.fs-2, small { font-size: var(--fs-2); }
.fs-1 { font-size: var(--fs-1); }
.muted { color: var(--muted); }
.ok { color: var(--ok); } .bad { color: var(--bad); } .warn { color: var(--warn); } .gold { color: var(--gold); }
.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; }

/* focus rings: visible, never removed */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
:focus:not(:focus-visible) { outline: none; }

/* reduced motion: durations to ~0, colour changes kept */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- shell ---------- */
/* content column 680; at >= 1024 the box widens to column + 24 + rail (320) and screens that
   carry a rail use .with-rail; the column stays on the left so it never jumps between screens */
.hdr {
  position: sticky; top: 0; z-index: 20;
  height: var(--header-h);
  margin-inline: calc(-1 * var(--gutter));   /* bleed to the viewport edges */
  padding-inline: var(--gutter);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.hdr-inner, #view, #dock .dock-inner, #banner .banner-inner {
  max-width: var(--col);
  margin-inline: auto;
  width: 100%;
}
@media (min-width: 1024px) {
  .hdr-inner, #view, #dock .dock-inner, #banner .banner-inner { max-width: calc(var(--col) + 24px + var(--rail)); }
}
.hdr-inner { height: 100%; display: flex; align-items: center; gap: 8px; }
.hdr-left, .hdr-right { display: flex; align-items: center; gap: 8px; min-width: 0; }
.hdr-left { flex: 1 1 auto; }
.hdr-home { display: inline-flex; align-items: center; color: inherit; text-decoration: none; border-radius: 50%; }
.hdr-right { flex: 0 0 auto; justify-content: flex-end; }

/* readiness ring slot (compact, 36 px; the 88 px hero ring lives on Home) */
.ring { position: relative; display: grid; place-items: center; flex: 0 0 auto; }
.ring svg { position: absolute; inset: 0; width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 4; stroke-linecap: round; }
.ring .ring-track { stroke: var(--line); }
.ring .ring-fill { stroke: var(--accent); transition: stroke-dashoffset var(--dur-3) var(--ease), opacity var(--dur-2); }
.ring .ring-fill[data-empty="true"] { opacity: 0; }
.ring[data-provisional="true"] .ring-track { stroke-dasharray: 3 3; }   /* provisional Readiness = dashed ring (S4) */
.ring .ring-num { position: relative; font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-weight: 650; line-height: 1; }
.ring-readiness { width: 36px; height: 36px; }
.ring-readiness .ring-num { font-size: 12px; }
.ring-level { width: 28px; height: 28px; }
.ring-level circle { stroke-width: 3; }
.ring-level .ring-fill { stroke: var(--gold); }
.ring-level .ring-num { font-size: 11px; }

.chip {
  display: inline-block; vertical-align: middle;
  height: 24px; line-height: 22px; padding-inline: 8px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--surface);
  font-size: var(--fs-1); font-variant-numeric: tabular-nums; font-weight: 500;
  color: var(--text); white-space: nowrap; text-decoration: none;
  max-width: 100%; min-width: 0; overflow: hidden; text-overflow: ellipsis;   /* truncates before it can overlap */
}
.chip.mono { font-family: var(--font-mono); }
.chip[data-tone="warn"] { border-color: var(--warn); color: var(--warn); }
.chip[data-tone="accent"] { border-color: var(--accent); color: var(--accent-ink); }
.chip[data-tone="bad"] { border-color: var(--bad); color: var(--bad); }
.hdr-xp { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: var(--fs-2); white-space: nowrap; }
@media (max-width: 420px) {
  .hdr-right { gap: 6px; }
  .hdr-xp { font-size: var(--fs-1); }
  .combo .combo-n { display: none; }        /* the pip's colour + aria-label carry the combo on phones */
}

/* combo pip: dot, amber >= 5, violet >= 10 (S4) */
.combo { display: inline-flex; align-items: center; gap: 4px; font-family: var(--font-mono); font-size: var(--fs-1); font-variant-numeric: tabular-nums; color: var(--muted); }
.combo-pip { width: 8px; height: 8px; border-radius: 50%; background: var(--line); transition: background var(--dur-2), transform var(--dur-2) var(--ease); }
.combo[data-tier="1"] .combo-pip { background: var(--accent); }
.combo[data-tier="2"] .combo-pip { background: var(--warn); transform: scale(1.25); }
.combo[data-tier="3"] .combo-pip { background: var(--violet); transform: scale(1.5); }
.combo[data-tier="2"] { color: var(--warn); }
.combo[data-tier="3"] { color: var(--violet); }

/* protractor streak arc: opens 10° per day */
.streak { display: inline-flex; align-items: center; gap: 4px; font-family: var(--font-mono); font-size: var(--fs-1); font-variant-numeric: tabular-nums; color: var(--muted); }
.streak svg { width: 28px; height: 20px; overflow: visible; }
.streak .arc-track { fill: none; stroke: var(--line); stroke-width: 3; stroke-linecap: round; }
.streak .arc-fill { fill: none; stroke: var(--gold); stroke-width: 3; stroke-linecap: round; }
.streak .arc-base { stroke: var(--line); stroke-width: 2; }
.streak[data-count="0"] .arc-fill { display: none; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: var(--tap); height: var(--tap);
  border: 0; border-radius: 10px; background: transparent; color: var(--muted);
  cursor: pointer;
}
.icon-btn:hover { background: var(--surface2); color: var(--text); }
.icon-btn svg { width: 20px; height: 20px; }

#banner { position: sticky; top: var(--header-h); z-index: 19; margin-inline: calc(-1 * var(--gutter)); padding-inline: var(--gutter); background: var(--warn); color: #0F1728; }
#banner .banner-inner { display: flex; align-items: center; gap: 8px; min-height: 32px; padding-block: 4px; font-size: var(--fs-2); }
#banner .banner-inner button { margin-inline-start: auto; }

#view { padding-block: 16px 24px; min-height: calc(100dvh - var(--header-h)); outline: none; }
.screen { max-width: var(--col); }
.with-rail { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; }
.with-rail > .col { min-width: 0; max-width: var(--col); }
@media (min-width: 1024px) {
  .with-rail { grid-template-columns: minmax(0, var(--col)) var(--rail); gap: 24px; align-items: start; }
  .with-rail > .rail { position: sticky; top: calc(var(--header-h) + 16px); }
}

/* navigation: 24 px slide + fade 200 ms (transform/opacity only) */
@keyframes view-in { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }
.view-enter { animation: view-in var(--dur-2) var(--ease) both; }

/* dock slot (Answer Dock sticky bottom, T08a fills it) */
#dock { position: sticky; bottom: 0; z-index: 18; margin-inline: calc(-1 * var(--gutter)); padding-inline: var(--gutter); padding-bottom: env(safe-area-inset-bottom); background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-top: 1px solid var(--line); }

/* buttons + inputs (base only; components.css refines) */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: var(--tap); padding: 8px 16px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
  font-weight: 600; cursor: pointer; text-decoration: none;
  transition: background var(--dur-1), border-color var(--dur-1), transform var(--dur-1) var(--ease);
}
.btn:hover { background: var(--surface2); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #06121A; }
.btn-primary:hover { filter: brightness(1.06); background: var(--accent); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--accent-ink); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
input, textarea, select {
  min-height: var(--input-h); padding: 8px 12px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
}
textarea { min-height: 96px; resize: vertical; }
input:focus-visible, textarea:focus-visible, select:focus-visible { border-color: var(--accent); outline-offset: 0; }

/* placeholder screens (until each screen ticket lands) */
.placeholder { padding: 24px; border: 1px dashed var(--line); border-radius: var(--radius); background: var(--surface); }
.placeholder h1 { margin-bottom: 4px; }
.placeholder dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin-block: 16px; font-family: var(--font-mono); font-size: var(--fs-2); }
.placeholder dt { color: var(--muted); }
.route-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; padding: 0; list-style: none; }
.route-list a { display: inline-flex; align-items: center; min-height: 36px; padding-inline: 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface2); color: var(--text); text-decoration: none; font-family: var(--font-mono); font-size: var(--fs-1); }
.route-list a[aria-current="page"] { border-color: var(--accent); color: var(--accent-ink); }
/* === /T01 === */