/* ------------------------------------------------------------------
   ui.css - icons, motion and hover states.
   Layered on top of site.css. Everything here degrades to the plain
   page if JavaScript is off or the reader prefers reduced motion.
------------------------------------------------------------------ */

:root {
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 1px 2px rgba(20, 22, 28, 0.04), 0 8px 24px -12px rgba(20, 22, 28, 0.16);
  --shadow-lift: 0 2px 4px rgba(20, 22, 28, 0.05), 0 16px 32px -14px rgba(20, 22, 28, 0.22);
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.ico {
  width: 1em; height: 1em; flex: none;
  fill: none; stroke: currentColor;
  stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
  vertical-align: -0.12em;
}

/* ---------- scroll progress ---------- */
.progress {
  position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 50;
  pointer-events: none; background: transparent;
}
.progress i { display: block; height: 100%; width: 0; background: var(--accent); }

/* ---------- scroll reveal ---------- */
@media (prefers-reduced-motion: no-preference) {
  .rv { opacity: 0; transform: translateY(12px); }
  .rv.in {
    opacity: 1; transform: none;
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  }
  body.js .top > .wrap > * { animation: rise 0.7s var(--ease) backwards; }
  body.js .byline { animation-delay: 0.02s; }
  body.js h1 { animation-delay: 0.08s; }
  body.js .sub { animation-delay: 0.14s; }
  body.js .lead { animation-delay: 0.2s; }
  body.js .reads { animation-delay: 0.26s; }
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

/* ---------- facts strip ---------- */
.facts-row p { position: relative; }
.facts-row b { font-variant-numeric: tabular-nums; }
.fact-label { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.88rem; }
.fact-label .ico { color: var(--accent); opacity: 0.85; width: 0.95em; height: 0.95em; }

/* ---------- read buttons ---------- */
.read {
  position: relative; overflow: hidden;
  transition: background 0.2s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.read:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); }
.read:active { transform: translateY(0); }
.read-main { display: inline-flex; align-items: center; gap: 0.5rem; }
.read-main .ico { transition: transform 0.25s var(--ease); }
.read:hover .read-main .ico { transform: translateX(4px); }

.btn { transition: background 0.2s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease); }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

/* ---------- tab bar ---------- */
body.js .tabbar-row { position: relative; }
body.js .tabbar button { transition: color 0.2s var(--ease); }
body.js .tabbar button[aria-selected="true"] { border-bottom-color: transparent; }
.tab-ink {
  position: absolute; bottom: 0; left: 0; height: 2px; width: 0;
  background: var(--accent); border-radius: 2px 2px 0 0;
  transition: transform 0.35s var(--ease), width 0.35s var(--ease);
}
@media (prefers-reduced-motion: reduce) { .tab-ink { transition: none; } }

@media (prefers-reduced-motion: no-preference) {
  body.js [role="tabpanel"]:not([hidden]) { animation: panel 0.35s var(--ease); }
}
@keyframes panel { from { opacity: 0; transform: translateY(6px); } }

/* ---------- cards ---------- */
.fw {
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}
.fw:hover { border-color: #c7d2f2; box-shadow: var(--shadow); transform: translateY(-2px); }
.fw-part { display: inline-flex; align-items: center; gap: 0.35rem; }

.fw-item { transition: border-color 0.2s var(--ease), background 0.2s var(--ease); }
.fw-item:hover { border-color: #c7d2f2; background: #fff; }
.fw-item > summary::after { transition: transform 0.25s var(--ease), color 0.2s var(--ease); }
.fw-item[open] > summary::after { transform: rotate(180deg); }
.fw-item > summary:hover::after { color: var(--accent); }

/* ---------- disclosure contents ---------- */
@media (prefers-reduced-motion: no-preference) {
  .fw-item[open] .fw-why,
  .fw-item[open] .fw-ideas,
  .idea[open] .idea-body,
  .toc[open] ol { animation: reveal 0.3s var(--ease); }
}
@keyframes reveal { from { opacity: 0; transform: translateY(-6px); } }

/* ---------- verdict board ---------- */
.idea summary {
  transition: background 0.2s var(--ease), border-left-color 0.2s var(--ease);
}
.idea summary:hover { background: var(--wash); }
.idea summary::after { transition: transform 0.25s var(--ease), color 0.2s var(--ease); }
.idea[open] summary::after { transform: rotate(180deg); }
.idea[open] summary { background: var(--wash); }
.band h3 .ico { color: var(--accent); }
.band-dot {
  width: 7px; height: 7px; border-radius: 50%; flex: none;
  display: inline-block; align-self: center; background: var(--accent);
}
.band-promising .band-dot { background: #8aa6ee; }
.band-conditional .band-dot { background: #cdd3de; }
.band-weak .band-dot { background: #fff; border: 1px solid var(--line); }

.tabs button { transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease); }

/* ---------- papers ---------- */
.paper { transition: background 0.25s var(--ease); }
.rail .part { display: inline-flex; align-items: center; gap: 0.35rem; }
.toc summary { transition: color 0.2s var(--ease); }

/* ---------- field ---------- */
.field-text h3 { display: flex; align-items: center; gap: 0.45rem; }
.field-text h3 .ico { color: var(--accent); width: 0.95em; height: 0.95em; }
.field-text li { display: flex; align-items: baseline; gap: 0.5rem; }
.field-text li::before {
  content: ''; width: 4px; height: 4px; border-radius: 50%;
  background: var(--line); flex: none; transform: translateY(-2px);
}
.map .dot { transform-box: fill-box; transform-origin: center; }
@media (prefers-reduced-motion: no-preference) {
  .map.in .dot { animation: pop 0.45s var(--ease) backwards; }
}
@keyframes pop { from { opacity: 0; transform: scale(0.2); } }

/* ---------- headshot ---------- */
.headshot { box-shadow: var(--shadow); transition: transform 0.3s var(--ease); }
.headshot:hover { transform: translateY(-2px) scale(1.01); }

/* ---------- feedback ---------- */
.fb-open {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 40;
  display: inline-flex; align-items: center; gap: 0.45rem;
  font: inherit; font-size: var(--fs-label); font-weight: 500;
  padding: 0.6rem 1rem; cursor: pointer;
  background: var(--ink); color: #fff; border: 0; border-radius: 999px;
  box-shadow: var(--shadow-lift);
  transition: transform 0.25s var(--ease), background 0.2s var(--ease);
}
.fb-open:hover { transform: translateY(-2px); background: #000; }

.fb-panel {
  position: fixed; right: 1.25rem; bottom: 4.4rem; z-index: 41;
  width: min(22rem, calc(100vw - 2.5rem));
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow-lift); padding: 1.1rem;
}
.fb-panel[hidden] { display: none; }
@media (prefers-reduced-motion: no-preference) {
  .fb-panel { animation: rise 0.25s var(--ease); }
}
.fb-panel h2 { font-size: var(--fs-body); font-weight: 500; margin-bottom: 0.15rem; }
.fb-panel .fb-sub { font-size: var(--fs-label); color: var(--mute); margin-bottom: 0.8rem; }
.fb-panel label { display: block; font-size: var(--fs-label); color: var(--soft); margin-bottom: 0.25rem; }
.fb-panel textarea, .fb-panel input {
  font: inherit; font-size: var(--fs-label); width: 100%;
  border: 1px solid var(--line); border-radius: 8px; padding: 0.5rem 0.6rem;
  color: var(--ink); background: #fff; margin-bottom: 0.7rem; resize: vertical;
}
.fb-panel textarea { min-height: 6.5rem; line-height: 1.5; }
.fb-panel textarea:focus, .fb-panel input:focus { border-color: var(--accent); outline: none; }
.fb-row { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }
.fb-send {
  font: inherit; font-size: var(--fs-label); font-weight: 500; cursor: pointer;
  padding: 0.5rem 1rem; background: var(--accent); color: #fff; border: 0; border-radius: 8px;
  transition: background 0.2s var(--ease);
}
.fb-send:hover { background: #244fc7; }
.fb-cancel {
  font: inherit; font-size: var(--fs-label); cursor: pointer;
  background: none; border: 0; color: var(--mute); padding: 0.5rem 0;
}
.fb-cancel:hover { color: var(--ink); }
.fb-note { font-size: 0.72rem; color: var(--mute); margin-top: 0.7rem; line-height: 1.5; }
.fb-note a { color: var(--soft); }
@media (max-width: 560px) {
  .fb-open { right: 1rem; bottom: 1rem; }
  .fb-panel { right: 1rem; left: 1rem; bottom: 4.2rem; width: auto; }
}

/* ---------- footnotes ---------- */
sup a { transition: color 0.15s var(--ease); }
sup a:hover { color: var(--ink); }
.footnotes li { transition: color 0.2s var(--ease); }
.footnotes li:target { color: var(--ink); }