:root {
  --sg-paper: var(--sc-paper, #f6f4ef);
  --sg-surface: var(--sc-surface, #fff);
  --sg-ink: var(--sc-ink, #171a1f);
  --sg-ink-soft: var(--sc-ink-soft, #4b5563);
  --sg-muted: var(--sc-muted, #8a8f98);
  --sg-line: var(--sc-line, #e8e5dd);
  --sg-accent: var(--sc-accent, #2e5bff);
  --sg-accent-deep: var(--sc-accent-deep, #1f44cc);
  --sg-accent-soft: var(--sc-accent-soft, #ebf0ff);
  --sg-green: var(--sc-green, #279a64);
  --sg-green-soft: var(--sc-green-soft, #e4f4ec);
  --sg-red: var(--sc-red, #de5b4e);
  --sg-red-soft: var(--sc-red-soft, #fceae8);
  --sg-dark: var(--sc-inverse, #171a1f);
  --sg-dark-text: #f6f4ef;
  --sg-shadow: var(--sc-shadow-card, 0 1px 2px rgba(23, 26, 31, .05), 0 10px 30px -12px rgba(23, 26, 31, .12));
  --sg-ease-out: var(--sc-ease-out, cubic-bezier(.23, 1, .32, 1));
  --sg-ease-in-out: var(--sc-ease-in-out, cubic-bezier(.77, 0, .175, 1));
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--sg-paper); }
body {
  margin: 0;
  min-height: 100dvh;
  background: var(--sg-paper);
  color: var(--sg-ink);
  font: 500 15px/1.55 var(--sc-font-body, Inter, system-ui, sans-serif);
}
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
small { display: block; color: var(--sg-muted); font-size: .72rem; }

.sg-shell {
  width: min(100%, 560px);
  margin: 0 auto;
  padding: 24px 18px 120px;
}
.sg-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.sg-back {
  color: var(--sg-muted);
  font-size: .8rem;
  font-weight: 750;
  text-decoration: none;
}
.sg-kicker {
  margin: 0;
  color: var(--sg-accent-deep);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.sg-title {
  margin: 7px 0 0;
  font: 700 clamp(1.9rem, 8vw, 2.8rem)/1.04 var(--sc-font-display, "Bricolage Grotesque", sans-serif);
  letter-spacing: -.045em;
}
.sg-sub {
  max-width: 43ch;
  margin: 10px 0 0;
  color: var(--sg-muted);
}
.sg-card {
  margin-top: 16px;
  padding: 20px;
  border-radius: var(--sc-r-card, 22px);
  background: var(--sg-surface);
  box-shadow: var(--sg-shadow);
}
.sg-card.dark { background: var(--sg-dark); color: var(--sg-dark-text); }
.sg-card-title {
  margin: 12px 0 0;
  font: 700 1.5rem/1.15 var(--sc-font-display, "Bricolage Grotesque", sans-serif);
}
.sg-row { display: flex; align-items: center; gap: 12px; }
.sg-row.between { justify-content: space-between; }
.sg-row > .sg-input { flex: 1; min-width: 0; }
.sg-avatar {
  display: grid;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: var(--sg-accent-soft);
  color: var(--sg-accent-deep);
  font-size: .72rem;
  font-weight: 850;
}
.sg-drag-source { touch-action: none; user-select: none; }
.sg-avatar.is-target {
  width: 58px;
  height: 58px;
  outline: 3px solid color-mix(in srgb, var(--sg-accent) 35%, transparent);
  outline-offset: 4px;
  transition: transform 180ms var(--sg-ease-out), background-color 180ms ease;
}
.sg-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 16px;
  border: 0;
  border-radius: var(--sc-r-control, 14px);
  background: var(--sg-accent);
  color: #fff;
  font-weight: 780;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: transform 160ms var(--sg-ease-out), opacity 160ms ease, background-color 160ms ease;
}
.sg-button:active { transform: scale(.98); }
.sg-button:disabled { cursor: not-allowed; opacity: .48; }
.sg-button.secondary { background: var(--sg-accent-soft); color: var(--sg-accent-deep); }
.sg-button.ghost { border: 1px solid var(--sg-line); background: transparent; color: var(--sg-ink); }
.sg-button.dark-ghost { margin-top: 16px; border-color: rgba(255,255,255,.22); color: var(--sg-dark-text); }
.sg-button.danger { background: var(--sg-red-soft); color: var(--sg-red); }
.sg-button.block { width: 100%; }
.sg-input, .sg-textarea {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--sg-line);
  border-radius: var(--sc-r-control, 14px);
  outline: 0;
  background: var(--sg-paper);
  color: var(--sg-ink);
}
.sg-input::placeholder, .sg-textarea::placeholder { color: var(--sg-muted); }
.sg-input:focus, .sg-textarea:focus {
  border-color: var(--sg-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--sg-accent) 18%, transparent);
}
.sg-label { display: block; margin: 0 0 8px; font-size: .78rem; font-weight: 760; }
.sg-form, .sg-list, .sg-status-list { display: grid; gap: 10px; }
.sg-list-item, .sg-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--sg-line);
  border-radius: 16px;
  background: var(--sg-surface);
  text-decoration: none;
}
.sg-status-row { border: 0; background: var(--sg-paper); }
.sg-empty, .sg-error, .sg-loading { padding: 22px 4px; color: var(--sg-muted); text-align: center; }
.sg-error { color: var(--sg-red); }
.sg-live { min-height: 1.4em; margin: 9px 0 0; color: var(--sg-muted); font-size: .78rem; }
.sg-note { margin: 16px 0; color: var(--sg-ink-soft); font-size: .8rem; }
.sg-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: var(--sc-r-pill, 999px);
  background: color-mix(in srgb, var(--sg-muted) 12%, transparent);
  color: var(--sg-muted);
  font-size: .68rem;
  font-weight: 780;
}
.sg-pill.blue { background: var(--sg-accent-soft); color: var(--sg-accent-deep); }
.sg-pill.green { background: var(--sg-green-soft); color: var(--sg-green); }
.sg-divider { height: 1px; margin: 18px 0; background: var(--sg-line); }
.sg-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 16px; }
.sg-actions > * { flex: 1 1 145px; }
.sg-question + .sg-question { margin-top: 24px; }
.sg-answer { min-height: 170px; resize: vertical; }
.sg-question-title {
  margin: 8px 0 18px;
  font: 700 1.18rem/1.25 var(--sc-font-display, "Bricolage Grotesque", sans-serif);
}
.sg-drag-zone {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 104px;
  padding: 20px;
  overflow: hidden;
  border: 1px dashed color-mix(in srgb, var(--sg-accent) 38%, transparent);
  border-radius: 18px;
  background: var(--sg-accent-soft);
  isolation: isolate;
}
.sg-liquid-bridge {
  flex: 1;
  height: 16px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--sg-accent) 22%, transparent);
  opacity: .4;
  transform: scaleX(.35);
  transition: transform 180ms var(--sg-ease-in-out), opacity 180ms ease;
}
.sg-drag-zone.dragging .sg-drag-source { will-change: transform; }
.sg-drag-zone.is-near .sg-liquid-bridge { opacity: .9; transform: scaleX(1); }
.sg-drag-zone.is-near .is-target { background: var(--sg-accent); color: #fff; transform: scale(1.04); }
.sg-drag-help { margin: 12px 0 16px; color: var(--sg-muted); font-size: .78rem; }
.sg-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.sg-compare > section {
  min-width: 0;
  padding: 15px;
  border-radius: 16px;
  background: var(--sg-paper);
}
.sg-compare strong { display: block; margin-bottom: 7px; color: var(--sg-muted); font-size: .72rem; }
.sg-compare p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.sg-observations { display: grid; gap: 10px; margin: 16px 0; }
.sg-observations section { padding: 15px; border-radius: 16px; background: var(--sg-accent-soft); }
.sg-observations h4 { margin: 0 0 7px; font-size: .82rem; }
.sg-observations ul { margin: 0; padding-left: 20px; color: var(--sg-ink-soft); }
.sg-observations li + li { margin-top: 5px; }
.sg-discussion { margin-top: 14px; }
.sg-thread { display: grid; gap: 8px; max-height: 320px; margin-bottom: 10px; overflow: auto; }
.sg-message { display: grid; gap: 3px; padding: 11px 13px; border-radius: 14px; background: var(--sg-paper); font-size: .84rem; }
.sg-message.mine { margin-left: 24px; background: var(--sg-accent-soft); }
.sg-message strong { font-size: .7rem; color: var(--sg-muted); }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (hover: hover) and (pointer: fine) {
  .sg-list-item[href]:hover { transform: translateY(-1px); }
  .sg-list-item[href] { transition: transform 160ms var(--sg-ease-out); }
  .sg-button:hover { opacity: .92; }
}
@media (max-width: 560px) {
  .sg-shell { padding-inline: 16px; }
  .sg-compare { grid-template-columns: 1fr; }
  .sg-actions > * { flex-basis: 100%; }
  .sg-card { padding: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  .sg-button, .sg-avatar.is-target, .sg-liquid-bridge, .sg-list-item[href] { transition-duration: 0ms; }
  .sg-liquid-bridge { visibility: hidden; transform: none; }
  .sg-drag-zone.is-near .is-target { transform: none; }
}