*,*::before,*::after{box-sizing:border-box;border:0 solid}html,body{margin:0;padding:0}button,input,select,textarea{font:inherit;color:inherit}button{background:none;cursor:pointer}



/* ─────────────────────────────────────────────────────────────────────────────
   WHAT IF? CIVILIZATION LAB — observer-layer design system.
   Near-black world stage; glass analytical panels; electric-blue accent;
   Inter for UI, tabular numerals for data. No spaceship chrome.
   ───────────────────────────────────────────────────────────────────────────── */

:root {
  --bg: #07080c;
  --panel: rgba(18, 22, 32, 0.84);
  --panel-solid: #12161f;
  --border: #2a3342;
  --border-soft: #232a38;
  --text: #eceff4;
  --muted: #8b93a3;
  --faint: #5c6474;
  --accent: #6e7bff;
  --accent-strong: #3834ff;
  --cyan: #22d3ee;
  --good: #4caf50;
  --warn: #ffc107;
  --bad: #f44336;
}

* { box-sizing: border-box; }

html, body, #root {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 13px;
  overflow: hidden;
}

.app-root { position: relative; width: 100%; height: 100%; }

/* ── panels ─────────────────────────────────────────────────────────────── */
.glass-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-soft);
  gap: 8px;
}

.panel-title {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.sub-head {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 14px 0 6px;
}

/* ── buttons ────────────────────────────────────────────────────────────── */
button { font-family: inherit; cursor: pointer; color: inherit; }

.ghost-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 4px;
}
.ghost-btn:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.ghost-btn.back { margin: 8px 12px 0; color: var(--accent); }

.top-btn, .bottom-btn, .speed-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-soft);
  color: var(--muted);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11.5px;
  font-weight: 500;
  transition: all 0.15s;
}
.top-btn:hover, .bottom-btn:hover, .speed-btn:hover { color: var(--text); border-color: var(--border); }
.top-btn.active, .bottom-btn.active, .speed-btn.active {
  color: var(--text);
  background: rgba(110, 123, 255, 0.16);
  border-color: var(--accent);
}
.top-btn.has-branch { border-color: var(--cyan); color: var(--cyan); }

/* ── top bar ────────────────────────────────────────────────────────────── */
.topbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: linear-gradient(to bottom, rgba(7,8,12,0.92), rgba(7,8,12,0.55) 75%, transparent);
  z-index: 20;
  pointer-events: none;
}
.topbar > * { pointer-events: auto; }
.topbar-left, .topbar-center, .topbar-right { display: flex; align-items: center; gap: 12px; }

.brand { display: flex; flex-direction: column; line-height: 1.05; }
.brand-what { font-weight: 800; font-size: 14px; letter-spacing: 0.06em; }
.brand-sub { font-size: 8.5px; letter-spacing: 0.34em; color: var(--muted); font-weight: 600; }

.scenario-chip {
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--border-soft);
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.15s;
}
.scenario-chip:hover { color: var(--text); border-color: var(--accent); }

.date-display {
  font-family: 'Fira Code', ui-monospace, monospace;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.speed-controls { display: flex; gap: 4px; }
.speed-btn { min-width: 36px; text-align: center; font-variant-numeric: tabular-nums; }

.influence-chip { font-size: 11.5px; color: var(--accent); font-variant-numeric: tabular-nums; }
.chip-label { color: var(--faint); font-size: 10px; }

/* ── bottom bar ─────────────────────────────────────────────────────────── */
.bottombar {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: linear-gradient(to top, rgba(7,8,12,0.92), rgba(7,8,12,0.5) 75%, transparent);
  z-index: 20;
  pointer-events: none;
}
.bottombar > * { pointer-events: auto; }
.bottom-group { display: flex; align-items: center; gap: 5px; }
.bottom-label {
  font-size: 9.5px; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--faint); margin-right: 4px;
}
.bottom-hint { font-size: 10.5px; color: var(--faint); }

/* ── left panel (civ inspector) ─────────────────────────────────────────── */
.left-panel {
  position: absolute;
  top: 64px; left: 12px; bottom: 56px;
  width: 288px;
  display: flex; flex-direction: column;
  z-index: 15;
}
.civ-scroll { overflow-y: auto; padding: 0 14px 14px; flex: 1; }

.civ-tabs { display: flex; gap: 0; padding: 0 14px; border-bottom: 1px solid var(--border-soft); }
.civ-tab {
  flex: 1;
  background: none; border: none;
  border-bottom: 2px solid transparent;
  padding: 8px 0 7px;
  font-size: 11.5px; font-weight: 600;
  color: var(--muted);
  transition: all 0.15s;
}
.civ-tab.active { color: var(--tint); border-bottom-color: var(--tint); }

.civ-tagline { font-size: 11px; color: var(--muted); font-style: normal; margin: 10px 0 4px; line-height: 1.45; }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px 10px; margin: 10px 0; }
.stat-label { font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }
.stat-value { font-size: 15px; font-weight: 600; font-variant-numeric: tabular-nums; margin-top: 1px; }
.stat-sub { font-size: 9.5px; color: var(--muted); font-variant-numeric: tabular-nums; }
.tone-good { color: var(--good); }
.tone-warn { color: var(--warn); }
.tone-bad { color: var(--bad); }

.metric-row { display: flex; align-items: center; gap: 8px; margin: 5px 0; }
.metric-label { font-size: 10px; color: var(--muted); width: 92px; flex-shrink: 0; }
.metric-val { font-size: 10.5px; color: var(--text); font-variant-numeric: tabular-nums; margin-left: auto; }

.bar-track { flex: 1; background: rgba(255,255,255,0.07); border-radius: 2px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 2px; transition: width 0.4s; }

.sparkline { display: block; margin-left: auto; }
.spark-empty { margin-left: auto; }

.mix-bar { display: flex; height: 8px; border-radius: 4px; overflow: hidden; margin: 4px 0; }
.mix-seg { height: 100%; }
.mix-legend { display: flex; flex-wrap: wrap; gap: 6px 10px; margin-bottom: 6px; }
.mix-item { font-size: 9.5px; color: var(--muted); display: flex; align-items: center; gap: 4px; }
.mix-item i { width: 7px; height: 7px; border-radius: 2px; display: inline-block; }

.priority-note {
  font-size: 11px; color: var(--text); line-height: 1.5;
  border-left: 2px solid var(--accent); padding-left: 10px;
}

/* ── right panel ────────────────────────────────────────────────────────── */
.right-panel {
  position: absolute;
  top: 64px; right: 12px; bottom: 56px;
  width: 348px;
  display: flex; flex-direction: column;
  z-index: 15;
}
.right-tabs { display: flex; gap: 2px; }
.right-tab {
  background: none; border: none;
  border-bottom: 2px solid transparent;
  padding: 4px 10px 6px;
  font-size: 11px; font-weight: 600;
  color: var(--muted);
}
.right-tab.active { color: var(--text); border-bottom-color: var(--accent); }

.tab-scroll { overflow-y: auto; flex: 1; padding: 10px 14px 14px; }

/* chronicle */
.chron-item {
  display: flex; align-items: flex-start; gap: 9px;
  width: 100%; text-align: left;
  background: none; border: none;
  border-bottom: 1px solid rgba(255,255,255,0.045);
  padding: 8px 2px;
  transition: background 0.12s;
}
.chron-item:hover { background: rgba(255,255,255,0.03); }
.chron-year { font-size: 10.5px; color: var(--faint); font-variant-numeric: tabular-nums; width: 32px; flex-shrink: 0; padding-top: 1px; }
.chron-dot { width: 7px; height: 7px; border-radius: 50%; margin-top: 4px; flex-shrink: 0; }
.chron-text { flex: 1; display: flex; flex-direction: column; }
.chron-title { font-size: 12px; line-height: 1.35; }
.chron-cat { font-size: 9.5px; color: var(--faint); text-transform: capitalize; }
.chron-why { font-size: 9.5px; color: var(--accent); opacity: 0; transition: opacity 0.12s; padding-top: 2px; }
.chron-item:hover .chron-why { opacity: 1; }
.empty-note { color: var(--faint); font-size: 11.5px; padding: 20px 4px; }

/* why */
.why-block { padding: 4px 2px; }
.why-kicker { font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); font-weight: 600; }
.why-title { font-size: 16px; font-weight: 700; margin: 5px 0 2px; line-height: 1.25; }
.why-date { font-size: 10px; color: var(--faint); text-transform: capitalize; margin-bottom: 8px; }
.why-body { font-size: 12px; color: var(--muted); line-height: 1.55; margin: 0 0 4px; }
.cause-row { display: flex; align-items: center; gap: 8px; margin: 4px 0; }
.cause-factor { font-size: 10.5px; color: var(--text); width: 130px; flex-shrink: 0; line-height: 1.25; }
.why-confidence { font-size: 10px; color: var(--faint); margin-top: 12px; line-height: 1.5; border-top: 1px solid var(--border-soft); padding-top: 8px; }

/* technology */
.tech-domain { margin-bottom: 6px; }
.domain-label { font-size: 9.5px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; margin: 8px 0 3px; }
.tech-list { border-bottom: 1px solid var(--border-soft); padding-bottom: 8px; margin-bottom: 4px; }
.tech-item {
  background: none; border: none; color: var(--muted);
  font-size: 11.5px; padding: 3px 8px 3px 12px;
  border-radius: 4px; margin-right: 2px;
}
.tech-item:hover { color: var(--text); background: rgba(255,255,255,0.04); }
.tech-item.active { color: var(--text); background: rgba(110,123,255,0.14); }

.tech-inspector { padding-top: 8px; }
.tech-head { display: flex; align-items: center; justify-content: space-between; }
.tech-name { font-size: 15px; font-weight: 700; }
.tech-sub { font-size: 10.5px; color: var(--muted); margin-top: 3px; font-variant-numeric: tabular-nums; }

.velocity-badge {
  font-size: 9.5px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 3px 8px; border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.velocity-badge.state-accelerating { color: var(--cyan); border-color: var(--cyan); }
.velocity-badge.state-rapid { color: var(--good); border-color: var(--good); }
.velocity-badge.state-stagnating { color: var(--bad); border-color: var(--bad); }

.pipeline { display: flex; gap: 2px; margin: 4px 0 6px; }
.pipe-stage {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px;
  opacity: 0.35;
}
.pipe-stage.reached { opacity: 0.75; }
.pipe-stage.current { opacity: 1; }
.pipe-dot { width: 100%; height: 3px; background: var(--border); border-radius: 2px; }
.pipe-stage.reached .pipe-dot { background: var(--accent); }
.pipe-stage.current .pipe-dot { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.pipe-label { font-size: 8px; letter-spacing: 0.04em; color: var(--muted); text-transform: uppercase; }

.factor-line { font-size: 11px; line-height: 1.5; padding: 1px 0; }
.factor-line.accel { color: #9fd4a8; }
.factor-line.constr { color: #e8a09a; }
.bottleneck-line { font-size: 11px; color: var(--muted); margin-top: 8px; }
.bottleneck-line b { color: var(--warn); }
.uncertainty-note { font-size: 10px; color: var(--faint); line-height: 1.5; margin-top: 8px; }
.calib-line { font-size: 10px; color: var(--faint); line-height: 1.5; padding: 1px 0; }

/* characters */
.char-item {
  display: flex; align-items: center; gap: 10px;
  width: 100%; text-align: left;
  background: none; border: none;
  border-bottom: 1px solid rgba(255,255,255,0.045);
  padding: 9px 2px;
}
.char-item:hover { background: rgba(255,255,255,0.03); }
.char-avatar {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700; color: #0a0c12;
  flex-shrink: 0;
}
.char-meta { flex: 1; display: flex; flex-direction: column; }
.char-item-name { font-size: 12.5px; font-weight: 600; }
.char-item-role { font-size: 10px; color: var(--muted); text-transform: capitalize; }
.char-mood-dot { width: 8px; height: 8px; border-radius: 50%; }
.char-mood-dot.good { background: var(--good); }
.char-mood-dot.warn { background: var(--warn); }
.char-mood-dot.bad { background: var(--bad); }

.char-head { padding: 4px 2px 0; }
.char-name { font-size: 16px; font-weight: 700; }
.char-role { font-size: 11px; color: var(--muted); text-transform: capitalize; }
.char-mood { font-size: 10px; color: var(--faint); font-variant-numeric: tabular-nums; margin-top: 2px; }

.topic-grid { display: flex; flex-wrap: wrap; gap: 6px; }
.topic-btn {
  background: rgba(110,123,255,0.1);
  border: 1px solid rgba(110,123,255,0.3);
  color: var(--accent);
  font-size: 10.5px;
  border-radius: 14px;
  padding: 5px 11px;
  transition: all 0.15s;
}
.topic-btn:hover { background: rgba(110,123,255,0.2); color: var(--text); }

.chat-log { margin-top: 10px; }
.chat-pair { margin-bottom: 12px; }
.chat-q { font-size: 11px; color: var(--accent); font-weight: 600; }
.chat-a {
  font-size: 12px; line-height: 1.6; color: var(--text);
  margin-top: 4px;
  border-left: 2px solid var(--border); padding-left: 10px;
}
.char-history-line { font-size: 11px; color: var(--muted); line-height: 1.5; padding: 2px 0; }
.char-belief { font-size: 11.5px; color: var(--text); padding: 3px 0; }

/* ── edge tabs ──────────────────────────────────────────────────────────── */
.edge-tab {
  position: absolute; top: 50%;
  z-index: 15;
  background: var(--panel); border: 1px solid var(--border);
  color: var(--muted); font-size: 12px;
  padding: 14px 5px;
}
.edge-tab.left { left: 0; border-radius: 0 8px 8px 0; border-left: none; }
.edge-tab.right { right: 0; border-radius: 8px 0 0 8px; border-right: none; }

/* ── modals ─────────────────────────────────────────────────────────────── */
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(4, 5, 8, 0.6);
  backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center;
  z-index: 30;
}
.modal { width: 720px; max-width: calc(100vw - 60px); max-height: calc(100vh - 120px); display: flex; flex-direction: column; overflow: hidden; }
.modal-modes { display: flex; gap: 2px; padding: 8px 14px 0; border-bottom: 1px solid var(--border-soft); }

.preset-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; padding: 14px; overflow-y: auto; }
.preset-card {
  display: flex; flex-direction: column; gap: 4px;
  text-align: left;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-soft);
  border-top: 2px solid var(--accent, #6e7bff);
  border-radius: 8px;
  padding: 12px;
  transition: all 0.15s;
}
.preset-card:hover { background: rgba(255,255,255,0.06); transform: translateY(-1px); }
.preset-name { font-size: 13px; font-weight: 700; }
.preset-tagline { font-size: 10.5px; color: var(--accent, #6e7bff); }
.preset-desc { font-size: 10.5px; color: var(--muted); line-height: 1.5; }
.preset-go { font-size: 10px; color: var(--faint); margin-top: 4px; }
.preset-card:hover .preset-go { color: var(--text); }

.builder { padding: 14px; overflow-y: auto; }
.axis-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.axis-label { font-size: 10px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); width: 130px; flex-shrink: 0; }
.axis-options { display: flex; flex-wrap: wrap; gap: 5px; }
.axis-opt {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-soft);
  color: var(--muted);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11px;
}
.axis-opt.active { color: var(--text); background: rgba(110,123,255,0.16); border-color: var(--accent); }

.launch-btn {
  width: 100%;
  margin-top: 12px;
  background: var(--accent-strong);
  border: none;
  color: white;
  font-size: 13px; font-weight: 600;
  border-radius: 8px;
  padding: 12px;
  transition: all 0.15s;
}
.launch-btn:hover:not(:disabled) { background: #4a47ff; }
.launch-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.whatif { padding: 14px; }
.whatif-hint { font-size: 11px; color: var(--muted); line-height: 1.55; margin-bottom: 10px; }
.whatif-input {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  padding: 10px 12px;
  resize: vertical;
}
.whatif-input:focus { outline: none; border-color: var(--accent); }
.whatif-result { margin-top: 10px; font-size: 11.5px; line-height: 1.55; border-radius: 8px; padding: 10px 12px; }
.whatif-result.ok { background: rgba(76,175,80,0.08); border: 1px solid rgba(76,175,80,0.3); }
.whatif-result.fail { background: rgba(244,67,54,0.08); border: 1px solid rgba(244,67,54,0.3); color: var(--muted); }
.whatif-params { font-family: 'Fira Code', ui-monospace, monospace; font-size: 10px; color: var(--faint); margin-top: 6px; }

/* interventions */
.interventions { width: 620px; }
.target-row { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border-soft); }
.target-row .axis-label { width: auto; }
.iv-message { margin: 8px 14px 0; font-size: 11.5px; color: var(--accent); }
.iv-list { overflow-y: auto; padding: 4px 14px 14px; }
.iv-item {
  display: flex; align-items: center; gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.045);
}
.iv-item.disabled { opacity: 0.45; }
.iv-info { flex: 1; }
.iv-label { font-size: 12.5px; font-weight: 600; }
.iv-cost { font-size: 10px; color: var(--accent); font-weight: 500; margin-left: 6px; font-variant-numeric: tabular-nums; }
.iv-desc { font-size: 10.5px; color: var(--muted); line-height: 1.45; margin-top: 2px; }
.iv-btn {
  background: rgba(110,123,255,0.14);
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 11px; font-weight: 600;
  flex-shrink: 0;
}
.iv-btn:hover:not(:disabled) { background: rgba(110,123,255,0.28); color: var(--text); }
.iv-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* branch */
.branch { width: 640px; }
.branch-create { padding: 14px; }
.branch-compare { padding: 14px; overflow-y: auto; }
.branch-switch { display: flex; gap: 6px; margin-bottom: 12px; }
.compare-table { border: 1px solid var(--border-soft); border-radius: 8px; overflow: hidden; }
.compare-row {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 0.8fr;
  gap: 8px;
  padding: 6px 12px;
  font-size: 11.5px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.compare-row.head { font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); background: rgba(255,255,255,0.02); }
.compare-row .num { font-variant-numeric: tabular-nums; text-align: right; }
.branch-actions { display: flex; gap: 8px; margin-top: 12px; justify-content: flex-end; }

/* evidence */
.evidence { width: 680px; }
.ev-item { border-bottom: 1px solid rgba(255,255,255,0.045); }
.ev-head {
  display: grid;
  grid-template-columns: 90px 1fr auto 70px;
  gap: 10px; align-items: baseline;
  width: 100%; text-align: left;
  background: none; border: none;
  padding: 8px 14px;
}
.ev-head:hover { background: rgba(255,255,255,0.03); }
.ev-domain { font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }
.ev-metric { font-size: 11.5px; }
.ev-value { font-size: 11px; color: var(--cyan); font-variant-numeric: tabular-nums; }
.ev-conf { font-size: 10px; text-align: right; }
.ev-detail { padding: 4px 14px 12px; font-size: 10.5px; color: var(--muted); line-height: 1.6; }
.ev-url { font-size: 9.5px; color: var(--faint); word-break: break-all; }
.ev-notes { margin-top: 4px; color: var(--text); }
.tuning-note { font-size: 10.5px; color: var(--muted); line-height: 1.6; padding: 0 14px 16px; }
.tuning-chip {
  display: inline-block;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  font-size: 9.5px;
  padding: 2px 8px;
  margin: 3px 3px 0;
}

/* ── welcome ────────────────────────────────────────────────────────────── */
.welcome {
  position: absolute; inset: 0;
  z-index: 40;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 50% 120%, rgba(56,52,255,0.14), transparent 60%),
              linear-gradient(to bottom, rgba(7,8,12,0.55), rgba(7,8,12,0.88));
  overflow-y: auto;
}
.welcome-inner { max-width: 860px; padding: 40px 24px; text-align: center; }
.welcome-kicker { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--muted); }
.welcome-title {
  font-size: 54px; font-weight: 800; letter-spacing: 0.02em;
  line-height: 1.02; margin: 14px 0 10px;
}
.welcome-title span { color: var(--accent); }
.welcome-tagline { font-size: 16px; color: var(--text); font-weight: 500; }
.welcome-desc {
  font-size: 12.5px; color: var(--muted); line-height: 1.7;
  max-width: 640px; margin: 16px auto 26px;
}
.welcome-presets { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; text-align: left; }
.welcome-foot { margin-top: 26px; font-size: 10px; letter-spacing: 0.08em; color: var(--faint); }

/* ── scrollbars ─────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #2a3342; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3a4456; }


/* ── frontier, land and decay additions ───────────────────────────────────── */
.kardashev-chip { display: flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border-soft); background: rgba(255,255,255,0.04); cursor: pointer; font-variant-numeric: tabular-nums; }
.kardashev-chip:hover { background: rgba(255,255,255,0.08); }
.k-label { font-size: 10px; letter-spacing: 0.12em; color: var(--faint); }
.k-value { font-size: 12px; font-weight: 600; }
.k-bar { width: 54px; height: 4px; border-radius: 2px; background: rgba(255,255,255,0.1); overflow: hidden; }
.k-fill { display: block; height: 100%; background: linear-gradient(90deg, #6E7BFF, #f6c177); }
.k-traj { font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.traj-ascent .k-traj, .frontier-traj.traj-ascent { color: #f6c177; }
.traj-growth .k-traj, .frontier-traj.traj-growth { color: #3fae6a; }
.traj-stagnation .k-traj, .frontier-traj.traj-stagnation { color: #9aa3ad; }
.traj-managed-decline .k-traj, .frontier-traj.traj-managed_decline { color: #d9a13b; }
.traj-crisis .k-traj, .frontier-traj.traj-crisis { color: #ff8a5c; }
.traj-collapse .k-traj, .frontier-traj.traj-collapse { color: #d94b3b; }
.frontier-head { padding: 6px 0 4px; }
.frontier-k { font-size: 15px; font-weight: 600; }
.frontier-era { font-size: 11px; color: var(--muted); margin-top: 2px; }
.frontier-traj { font-size: 10px; text-transform: uppercase; letter-spacing: 0.1em; margin-top: 4px; font-weight: 600; }
.frontier-line { font-size: 11px; line-height: 1.45; padding: 2px 0; }
.muted { color: var(--muted); }
.small { font-size: 10.5px; line-height: 1.4; }
.tone-good { color: #3fae6a; } .tone-warn { color: #d9a13b; } .tone-bad { color: #d94b3b; }
.milestone { padding: 6px 8px; margin: 4px 0; border-radius: 6px; border: 1px solid var(--border-soft); background: rgba(255,255,255,0.025); }
.milestone.ms-achieved { border-color: rgba(246,193,119,0.5); background: rgba(246,193,119,0.06); }
.milestone.ms-in_progress { border-color: rgba(110,123,255,0.5); }
.milestone.ms-available { border-color: rgba(63,174,106,0.5); }
.ms-row { display: flex; align-items: center; gap: 6px; }
.ms-dot { width: 7px; height: 7px; border-radius: 50%; background: #555; flex: none; }
.ms-achieved .ms-dot { background: #f6c177; box-shadow: 0 0 6px #f6c177; }
.ms-in_progress .ms-dot { background: #6E7BFF; } .ms-available .ms-dot { background: #3fae6a; }
.ms-name { font-size: 11.5px; font-weight: 600; flex: 1; }
.ms-status { font-size: 10px; color: var(--muted); font-variant-numeric: tabular-nums; }
.ms-summary { font-size: 10.5px; color: var(--muted); margin-top: 3px; line-height: 1.4; }
.ms-blockers { font-size: 10px; color: #d9a13b; margin-top: 3px; line-height: 1.35; }
.ms-effect { font-size: 10px; color: #cfd6ff; margin-top: 3px; line-height: 1.35; }
.chron-filter { display: flex; gap: 4px; padding: 4px 0 6px; }
.fatal { position: fixed; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; padding: 40px; background: #0b0e14; color: #e6e9ef; font-family: Inter, system-ui, sans-serif; text-align: center; }
.fatal pre { max-width: 800px; white-space: pre-wrap; color: #ff8a5c; font-size: 12px; }
.traj-extinction .k-traj, .frontier-traj.traj-extinction { color: #ff3b3b; }
.traj-flourishing .k-traj, .frontier-traj.traj-flourishing { color: #7fd0ff; }


/* ══════════════════════════════════════════════════════════════════════════
   v3 SHELL — cinematic observer layer. Deep sea-green stage, glass panels,
   mint accent, sand for the frontier. Layout is a fixed grid over the canvas.
   ══════════════════════════════════════════════════════════════════════════ */
:root { --s-bg: #07110f; --s-glass: rgba(9, 27, 24, 0.66); --s-glass-2: rgba(12, 36, 32, 0.55); --s-line: rgba(180, 230, 210, 0.14); --s-text: #e8f1ec; --s-muted: #93ada3; --s-faint: #5f7a70; --s-mint: #8fe3b9; --s-sand: #f0cf8c; --s-red: #ff7a6b; --s-amber: #ffc46b; }
body { background: var(--s-bg); }
.s-shell { position: absolute; inset: 0; z-index: 20; pointer-events: none; font-family: Inter, system-ui, sans-serif; color: var(--s-text); transition: opacity .3s; }
.s-shell.hidden { opacity: 0; }
.s-shell > * { pointer-events: auto; }
.s-shell.hidden > * { pointer-events: none; }
.s-panel { position: absolute; box-sizing: border-box; min-width: 0; background: var(--s-glass); backdrop-filter: blur(18px) saturate(1.2); -webkit-backdrop-filter: blur(18px) saturate(1.2); border: 1px solid var(--s-line); border-radius: 14px; padding: 16px 18px; box-shadow: 0 20px 60px rgba(0,0,0,0.35); }
.s-left { left: 18px; top: 74px; width: 272px; max-height: calc(100vh - 300px); overflow: auto; }
.s-right { right: 18px; top: 74px; width: 316px; max-height: calc(100vh - 300px); overflow: auto; }
.s-kicker { font-size: 9.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--s-faint); display: flex; align-items: center; gap: 8px; }
.s-kicker.s-center { justify-content: center; }
.s-live { color: var(--s-mint); letter-spacing: .1em; }
.s-mt { margin-top: 14px; }
.s-world-title { font-family: 'Iowan Old Style', 'Palatino Linotype', Georgia, serif; font-weight: 500; font-size: 26px; line-height: 1.1; margin: 6px 0 2px; letter-spacing: -.01em; }
.s-world-sub { font-style: italic; color: var(--s-muted); font-size: 12px; line-height: 1.4; }
.s-big { font-size: 34px; max-width: 100%; overflow-wrap: anywhere; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -.02em; line-height: 1; margin-top: 4px; }
.s-big-unit { font-size: 11px; font-weight: 500; color: var(--s-muted); margin-left: 6px; letter-spacing: 0; }
.s-muted { color: var(--s-muted); font-size: 11px; line-height: 1.4; margin-top: 4px; }
.s-muted-num { color: var(--s-faint); margin-left: auto; letter-spacing: 0; }
.s-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.s-badge { font-size: 10.5px; padding: 4px 9px; border-radius: 999px; border: 1px solid var(--s-line); background: var(--s-glass-2); color: var(--s-text); text-transform: capitalize; }
.s-badge.traj-ascent, .s-badge.traj-flourishing { color: var(--s-sand); border-color: rgba(240,207,140,.4); }
.s-badge.traj-crisis, .s-badge.traj-collapse, .s-badge.traj-extinction { color: var(--s-red); border-color: rgba(255,122,107,.4); }
.s-civ-list { display: flex; flex-direction: column; gap: 4px; margin-top: 8px; }
.s-civ-row { display: grid; grid-template-columns: 22px 1fr auto; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; border: 1px solid transparent; text-align: left; color: inherit; }
.s-civ-row:hover { background: rgba(255,255,255,.04); }
.s-civ-row.active { background: rgba(143,227,185,.08); border-color: rgba(143,227,185,.25); }
.s-civ-glyph { font-size: 16px; text-align: center; } .s-civ-glyph.big { font-size: 26px; }
.s-civ-text { display: flex; flex-direction: column; min-width: 0; }
.s-civ-name { font-size: 13px; font-weight: 600; }
.s-civ-epithet { font-size: 10.5px; color: var(--s-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.s-civ-pop { font-size: 14px; white-space: nowrap; max-width: 74px; overflow: hidden; text-overflow: ellipsis; font-weight: 600; font-variant-numeric: tabular-nums; } .s-civ-pop small { font-size: 10px; color: var(--s-muted); margin-left: 1px; }
.s-link { margin-top: 12px; color: var(--s-mint); font-size: 11.5px; text-align: left; padding: 0; }
.s-link:hover { text-decoration: underline; }
.s-topnav { position: absolute; top: 0; left: 0; right: 0; height: 56px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 22px; background: linear-gradient(180deg, rgba(7,17,15,.75), rgba(7,17,15,0)); }
.s-brand { display: flex; flex-direction: column; line-height: 1; }
.s-brand-what { font-family: 'Iowan Old Style', 'Palatino Linotype', Georgia, serif; font-size: 22px; letter-spacing: .02em; }
.s-brand-sub { font-size: 8px; letter-spacing: .28em; color: var(--s-faint); margin-top: 3px; }
.s-nav { display: flex; gap: 4px; }
.s-nav-item { padding: 8px 14px; border-radius: 999px; font-size: 12px; color: var(--s-muted); }
.s-nav-item.active { color: var(--s-text); border-bottom: 1px solid var(--s-mint); border-radius: 0; }
.s-nav-item:hover { color: var(--s-text); }
.s-nav-right { display: flex; justify-content: flex-end; gap: 8px; align-items: center; }
.s-icon-btn { width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--s-line); background: var(--s-glass-2); color: var(--s-muted); }
.s-icon-btn:hover { color: var(--s-text); }
.s-primary-btn { padding: 8px 14px; border-radius: 999px; border: 1px solid var(--s-line); background: rgba(255,255,255,.06); color: var(--s-text); font-size: 12px; font-weight: 500; }
.s-primary-btn:hover { background: rgba(143,227,185,.16); border-color: rgba(143,227,185,.4); }
.s-primary-btn.s-full { width: 100%; margin-top: 14px; }
.s-stage { position: absolute; top: 70px; left: 50%; transform: translateX(-50%); text-align: center; pointer-events: none; width: 520px; }
.s-stage-title { font-family: 'Iowan Old Style', 'Palatino Linotype', Georgia, serif; font-size: 28px; margin-top: 4px; text-shadow: 0 4px 24px rgba(0,0,0,.5); }
.s-stage-sub { font-size: 11px; color: var(--s-muted); margin-top: 2px; }
.s-civ-head { display: flex; gap: 12px; align-items: center; margin: 8px 0 10px; }
.s-civ-title { font-family: 'Iowan Old Style', 'Palatino Linotype', Georgia, serif; font-size: 24px; line-height: 1; }
.s-tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--s-line); margin-bottom: 10px; }
.s-tab { padding: 6px 10px; font-size: 11.5px; color: var(--s-muted); border-bottom: 2px solid transparent; }
.s-tab.active { color: var(--s-text); border-bottom-color: var(--s-mint); }
.s-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 12px; margin-bottom: 8px; }
.s-fact-label { font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--s-faint); }
.s-fact-value { font-size: 18px; max-width: 100%; min-width: 0; overflow-wrap: anywhere; font-weight: 600; font-variant-numeric: tabular-nums; margin-top: 2px; }
.s-fact-sub { font-size: 10px; color: var(--s-muted); line-height: 1.35; margin-top: 2px; }
.s-meter { padding: 7px 0; border-top: 1px solid var(--s-line); }
.s-meter.has-why { cursor: pointer; }
.s-meter-row { display: flex; justify-content: space-between; font-size: 12px; }
.s-meter-val { font-variant-numeric: tabular-nums; font-weight: 600; }
.s-why-dot { color: var(--s-faint); font-weight: 400; font-size: 10px; }
.s-meter-bar { height: 4px; background: rgba(255,255,255,.08); border-radius: 2px; margin-top: 6px; overflow: hidden; }
.s-meter-fill { display: block; height: 100%; background: var(--s-mint); border-radius: 2px; transition: width .4s; }
.s-meter-fill.tone-warn, .s-meter-val.tone-warn { color: var(--s-amber); } .s-meter-fill.tone-warn { background: var(--s-amber); }
.s-meter-fill.tone-bad, .s-meter-val.tone-bad { color: var(--s-red); } .s-meter-fill.tone-bad { background: var(--s-red); }
.s-meter-fill.tone-good { background: var(--s-mint); }
.s-why { margin-top: 8px; padding: 8px 10px; background: rgba(0,0,0,.25); border-radius: 8px; font-size: 10.5px; }
.s-why-row { display: flex; justify-content: space-between; gap: 8px; padding: 2px 0; }
.s-why-row em { color: var(--s-faint); font-style: normal; }
.s-why-row b.neg { color: var(--s-red); } .s-why-row b.pos { color: var(--s-mint); }
.s-why-foot { color: var(--s-muted); line-height: 1.45; margin-top: 4px; }
.s-priority { margin-top: 12px; padding: 10px 12px; border-radius: 10px; background: rgba(143,227,185,.06); border: 1px solid rgba(143,227,185,.18); font-size: 12px; line-height: 1.4; }
.s-proj { display: flex; justify-content: space-between; font-size: 11.5px; padding: 4px 0; border-top: 1px solid var(--s-line); text-transform: capitalize; }
.s-dock { position: absolute; left: 50%; transform: translateX(-50%); bottom: 118px; display: flex; flex-direction: column; gap: 6px; align-items: center; }
.s-dock-row { display: flex; align-items: center; gap: 10px; background: var(--s-glass); backdrop-filter: blur(14px); border: 1px solid var(--s-line); border-radius: 999px; padding: 6px 12px; }
.s-seg { display: flex; gap: 2px; }
.s-seg-btn { min-width: 30px; height: 26px; padding: 0 9px; border-radius: 999px; color: var(--s-muted); font-size: 11.5px; }
.s-seg-btn.active { background: rgba(255,255,255,.12); color: var(--s-text); }
.s-seg-btn:hover { color: var(--s-text); }
.s-timeline { display: flex; align-items: center; gap: 12px; background: var(--s-glass); backdrop-filter: blur(14px); border: 1px solid var(--s-line); border-radius: 999px; padding: 6px 12px 6px 6px; }
.s-play { width: 34px; height: 34px; border-radius: 50%; background: var(--s-mint); color: #07110f; font-size: 12px; }
.s-play.running { background: rgba(255,255,255,.14); color: var(--s-text); }
.s-year { font-size: 22px; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.s-influence { font-size: 12px; color: var(--s-sand); font-variant-numeric: tabular-nums; } .s-influence small { color: var(--s-muted); }
.s-strip { position: absolute; left: 18px; right: 18px; bottom: 16px; display: grid; grid-template-columns: 1fr 380px; gap: 14px; align-items: end; }
.s-events { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 6px; }
.s-event { text-align: left; padding: 10px 12px; border-radius: 10px; background: var(--s-glass); backdrop-filter: blur(12px); border: 1px solid var(--s-line); color: inherit; min-height: 54px; }
.s-event:hover { border-color: rgba(143,227,185,.4); }
.s-event-year { font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--s-faint); }
.s-event-title { font-size: 12px; margin-top: 3px; line-height: 1.3; }
.s-ask { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; background: var(--s-glass); backdrop-filter: blur(12px); border: 1px solid var(--s-line); border-radius: 12px; padding: 8px 10px; }
.s-ask input { flex: 1; min-width: 160px; background: transparent; border: 0; outline: 0; color: var(--s-text); font-size: 12px; }
.s-ask input::placeholder { color: var(--s-faint); }
.s-ask-hint { flex-basis: 100%; font-size: 10.5px; color: var(--s-muted); }
.s-drawer { z-index: 20; }
.city-label { text-align: center; color: var(--s-text); font-family: Inter, system-ui, sans-serif; text-shadow: 0 2px 8px rgba(0,0,0,.8); transition: opacity .3s; }
.city-label .lbl-name { font-family: 'Iowan Old Style', 'Palatino Linotype', Georgia, serif; font-size: 13px; letter-spacing: .02em; padding: 2px 8px; border-radius: 6px; background: rgba(7,17,15,.55); border: 1px solid var(--s-line); }
.city-label.lbl-main .lbl-name { font-size: 15px; }
.city-label .lbl-sub { font-size: 9px; letter-spacing: .1em; text-transform: uppercase; color: var(--s-muted); margin-top: 2px; }
.city-label.lbl-selected .lbl-name { border-color: var(--s-mint); }
.city-label.civ-veloria .lbl-sub { color: #9db8ff; } .city-label.civ-ardan .lbl-sub { color: #ffd08a; } .city-label.civ-nemea .lbl-sub { color: #8fe3b9; }
@media (max-width: 1180px) { .s-left { width: 230px; } .s-right { width: 280px; } .s-stage { width: 360px; } }

.s-decision-backdrop { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(4, 12, 10, .55); backdrop-filter: blur(6px); z-index: 30; }
.s-decision { width: 640px; max-width: calc(100vw - 40px); background: var(--s-glass); border: 1px solid rgba(240,207,140,.35); border-radius: 16px; padding: 22px 24px; box-shadow: 0 30px 90px rgba(0,0,0,.5); }
.s-decision-title { font-family: 'Iowan Old Style', 'Palatino Linotype', Georgia, serif; font-size: 26px; margin: 6px 0 8px; }
.s-decision-q { font-size: 13px; line-height: 1.5; color: var(--s-text); margin: 0 0 14px; }
.s-decision-options { display: grid; gap: 8px; }
.s-option { text-align: left; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--s-line); background: rgba(255,255,255,.03); color: inherit; }
.s-option:hover { border-color: rgba(143,227,185,.4); }
.s-option.active { border-color: var(--s-sand); background: rgba(240,207,140,.08); }
.s-option-label { font-size: 13px; font-weight: 600; }
.s-option-cons { font-size: 11px; color: var(--s-muted); margin-top: 3px; line-height: 1.4; }
.s-decision-actions { display: flex; gap: 8px; margin: 14px 0 8px; align-items: center; }
.s-ghost-btn { padding: 8px 12px; border-radius: 999px; color: var(--s-muted); font-size: 12px; }
.s-ghost-btn:hover { color: var(--s-text); }
.s-primary-btn:disabled { opacity: .4; cursor: default; }
.s-pending { color: var(--s-sand); display: block; }
.s-pyramid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; align-items: end; height: 96px; margin: 6px 0 4px; }
.s-pyr-col { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; font-size: 9px; color: var(--s-muted); gap: 2px; }
.s-pyr-bar { width: 100%; max-height: 64px; background: linear-gradient(180deg, var(--s-mint), rgba(143,227,185,.35)); border-radius: 3px 3px 0 0; }
.s-pyr-col b { color: var(--s-text); font-size: 10px; }

/* v11 physics/UI: make habitat geography and observer controls legible */
.s-habitat-ledger { margin-top: 10px; padding: 9px 10px; border: 1px solid rgba(143,227,185,.18); border-radius: 10px; background: linear-gradient(135deg, rgba(24,62,55,.28), rgba(16,29,39,.24)); }
.s-habitat-title { display:flex; justify-content:space-between; gap:8px; align-items:center; font-size:9.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--s-faint); }
.s-habitat-title b { color:var(--s-red); font-size:9px; letter-spacing:.12em; }
.s-habitat-pop { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:5px; margin-top:6px; }
.s-habitat-pop span { font-size:9.5px; color:var(--s-muted); } .s-habitat-pop b { display:block; color:var(--s-text); font-size:13px; font-variant-numeric:tabular-nums; }
.s-habitat-built { margin-top:7px; padding-top:6px; border-top:1px solid var(--s-line); display:flex; flex-wrap:wrap; gap:4px 7px; }
.s-habitat-built > span { flex-basis:100%; font-size:9px; text-transform:uppercase; letter-spacing:.1em; color:var(--s-faint); }
.s-habitat-built i { font-style:normal; font-size:9.5px; color:var(--s-muted); padding:2px 5px; border-radius:6px; background:rgba(255,255,255,.04); }
.iv-budget-note { margin: 0 0 12px; padding: 9px 11px; border-radius: 9px; border: 1px solid rgba(240,207,140,.22); background: rgba(240,207,140,.05); color: var(--s-muted); font-size: 11px; line-height: 1.45; } .iv-budget-note b { color: var(--s-sand); }
.influence-chip { cursor: help; border: 1px solid rgba(240,207,140,.18); border-radius: 999px; padding: 5px 9px; background: rgba(240,207,140,.05); }

.s-habitat-built i b { font-weight:600; color:var(--s-faint); margin-left:3px; }

/* ══════════════════════════════════════════════════════════════════════════
   v11.3 public-release UI lift — quieter chrome, clearer hierarchy, high-DPI
   scene visibility. The interface should frame the simulation, not compete
   with it.
   ══════════════════════════════════════════════════════════════════════════ */
:root {
  --s-bg: #050c0b;
  --s-glass: rgba(7, 20, 19, .72);
  --s-glass-2: rgba(10, 28, 26, .62);
  --s-line: rgba(198, 236, 224, .13);
  --s-line-strong: rgba(198, 236, 224, .24);
  --s-text: #edf5f1;
  --s-muted: #9ab2aa;
  --s-faint: #668078;
  --s-mint: #92ebc1;
  --s-sand: #f2d399;
}
.s-topnav {
  height: 62px;
  padding: 0 24px;
  background: linear-gradient(180deg, rgba(4,12,11,.93) 0%, rgba(4,12,11,.58) 64%, rgba(4,12,11,0) 100%);
  border-bottom: 1px solid rgba(196,235,222,.06);
  backdrop-filter: blur(14px) saturate(1.18);
  -webkit-backdrop-filter: blur(14px) saturate(1.18);
}
.s-brand-what { font-size: 23px; letter-spacing: -.01em; text-shadow: 0 4px 22px rgba(0,0,0,.6); }
.s-brand-sub { letter-spacing: .34em; color: #739188; }
.s-nav { gap: 3px; padding: 3px; border: 1px solid rgba(198,236,224,.08); border-radius: 999px; background: rgba(3,12,10,.28); }
.s-nav-item { min-height: 32px; padding: 7px 14px; border-radius: 999px; transition: background .18s ease, color .18s ease, border-color .18s ease; }
.s-nav-item.active { border: 1px solid rgba(146,235,193,.22); border-radius: 999px; background: rgba(146,235,193,.10); color: #f5fbf8; box-shadow: inset 0 1px rgba(255,255,255,.04); }
.s-icon-btn, .s-primary-btn { backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.s-icon-btn { border-radius: 10px; background: rgba(10,28,26,.7); }
.s-primary-btn { border-color: rgba(146,235,193,.18); background: linear-gradient(180deg, rgba(146,235,193,.12), rgba(146,235,193,.06)); }
.s-panel {
  background: linear-gradient(155deg, rgba(9,27,25,.82), rgba(5,17,16,.69));
  backdrop-filter: blur(24px) saturate(1.28);
  -webkit-backdrop-filter: blur(24px) saturate(1.28);
  border: 1px solid rgba(198,236,224,.14);
  border-radius: 18px;
  box-shadow: 0 22px 70px rgba(0,0,0,.38), inset 0 1px 0 rgba(255,255,255,.035);
}
.s-left, .s-right { top: 78px; }
.s-world-title, .s-civ-title, .s-stage-title { text-wrap: balance; }
.s-stage { top: 77px; width: min(620px, 44vw); filter: drop-shadow(0 5px 20px rgba(0,0,0,.42)); }
.s-stage-title { font-size: clamp(28px, 2.3vw, 40px); line-height: 1.03; letter-spacing: -.025em; }
.s-stage-sub { margin-top: 5px; font-size: 11.5px; }
.s-big { font-size: 38px; letter-spacing: -.035em; }
.s-civ-row { border-radius: 11px; transition: background .18s ease, transform .18s ease; }
.s-civ-row:hover { transform: translateX(2px); background: rgba(255,255,255,.045); }
.s-civ-row.active { background: linear-gradient(90deg, rgba(146,235,193,.10), rgba(146,235,193,.025)); box-shadow: inset 2px 0 var(--s-mint); }
.s-badge { border-radius: 999px; border: 1px solid rgba(198,236,224,.08); background: rgba(255,255,255,.025); }
.s-habitat-ledger {
  padding: 11px 12px;
  border-radius: 13px;
  border-color: rgba(146,235,193,.19);
  background: radial-gradient(circle at 15% 0%, rgba(78,158,133,.13), transparent 54%), linear-gradient(145deg, rgba(17,45,40,.38), rgba(8,20,24,.30));
  box-shadow: inset 0 1px rgba(255,255,255,.025);
}
.s-habitat-pop { gap: 7px; }
.s-habitat-pop span { padding: 6px 7px; border-radius: 8px; background: rgba(255,255,255,.025); }
.s-habitat-pop b { margin-top: 2px; font-size: 14px; }
.s-habitat-note { display: block; margin-top: 7px; color: var(--s-muted); font-size: 9.5px; line-height: 1.35; }
.s-habitat-note b { color: var(--s-text); font-weight: 600; }
.s-habitat-built i { border: 1px solid rgba(198,236,224,.07); background: rgba(255,255,255,.032); }
.s-xray-note { flex-basis: 100%; display: block; color: #6f9188; font-size: 8.8px; line-height: 1.35; margin-top: 2px; }
.s-meter-bar { height: 5px; background: rgba(255,255,255,.07); }
.s-meter-fill { box-shadow: 0 0 14px rgba(146,235,193,.14); }
.s-dock { bottom: 122px; gap: 7px; }
.s-dock-row, .s-timeline {
  background: rgba(5,18,16,.73);
  backdrop-filter: blur(22px) saturate(1.3);
  -webkit-backdrop-filter: blur(22px) saturate(1.3);
  border-color: rgba(198,236,224,.13);
  box-shadow: 0 13px 38px rgba(0,0,0,.30), inset 0 1px rgba(255,255,255,.03);
}
.s-dock-row { padding: 6px 9px; }
.s-seg-btn { transition: background .15s ease, color .15s ease, transform .15s ease; }
.s-seg-btn:hover { transform: translateY(-1px); }
.s-seg-btn.active { background: rgba(146,235,193,.11); box-shadow: inset 0 0 0 1px rgba(146,235,193,.12); }
.s-play { width: 36px; height: 36px; box-shadow: 0 4px 18px rgba(146,235,193,.22); }
.s-year { font-size: 23px; }
.s-influence { padding: 5px 9px; border-radius: 999px; border: 1px solid rgba(242,211,153,.11); background: rgba(242,211,153,.035); }
.s-event, .s-ask { border-radius: 13px; background: rgba(5,18,16,.72); backdrop-filter: blur(20px) saturate(1.2); -webkit-backdrop-filter: blur(20px) saturate(1.2); box-shadow: 0 12px 34px rgba(0,0,0,.24); }
.s-event { transition: border-color .18s ease, background .18s ease, transform .18s ease; }
.s-event:hover { transform: translateY(-2px); background: rgba(10,31,28,.82); }
.s-decision { border-radius: 22px; background: linear-gradient(150deg, rgba(10,29,26,.96), rgba(5,16,15,.94)); backdrop-filter: blur(28px); -webkit-backdrop-filter: blur(28px); }
.s-decision-backdrop { background: rgba(2,8,7,.58); backdrop-filter: blur(9px); -webkit-backdrop-filter: blur(9px); }
.city-label .lbl-name { padding: 4px 9px; border-radius: 8px; background: rgba(4,14,13,.68); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }

/* Welcome deliberately leaves the living 3D world visible behind the copy. */
.welcome { background: radial-gradient(circle at 50% 46%, rgba(6,18,16,.24), rgba(4,10,10,.73) 64%, rgba(3,8,8,.90)); backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px); }
.welcome-inner { max-width: 1040px; padding: 52px 28px 38px; }
.welcome-kicker { color: #829d94; letter-spacing: .34em; }
.welcome-title { font-size: clamp(48px, 7vw, 84px); line-height: .86; letter-spacing: -.045em; text-shadow: 0 18px 58px rgba(0,0,0,.58); }
.welcome-title span { color: #a2f1ca; }
.welcome-tagline { margin-top: 17px; font-size: clamp(17px, 1.6vw, 22px); font-weight: 520; }
.welcome-desc { max-width: 760px; margin: 16px auto 28px; font-size: 12.5px; line-height: 1.65; color: #a7bbb4; }
.welcome-presets { grid-template-columns: repeat(4, minmax(0,1fr)); gap: 11px; }
.welcome .preset-card { position: relative; min-height: 105px; padding: 15px 15px 14px; border-radius: 15px; overflow: hidden; background: linear-gradient(145deg, rgba(9,27,24,.79), rgba(6,16,16,.67)); border: 1px solid rgba(198,236,224,.12); box-shadow: 0 12px 36px rgba(0,0,0,.22); }
.welcome .preset-card::before { content: ''; position: absolute; left: 0; right: 0; top: 0; height: 2px; background: var(--accent); opacity: .72; }
.welcome .preset-card:hover { transform: translateY(-3px); background: linear-gradient(145deg, rgba(15,38,34,.88), rgba(7,20,19,.76)); border-color: color-mix(in srgb, var(--accent) 45%, transparent); box-shadow: 0 18px 46px rgba(0,0,0,.32); }
.welcome .preset-name { font-size: 13.5px; letter-spacing: -.01em; }
.welcome .preset-tagline { margin-top: 6px; color: #9db5ac; line-height: 1.42; }
.welcome-foot { color: #667f77; }

@media (max-width: 1240px) {
  .s-left { width: 242px; }
  .s-right { width: 286px; }
  .s-stage { width: 400px; }
  .s-strip { grid-template-columns: 1fr 330px; }
}
@media (max-width: 980px) {
  .s-nav-item { padding-inline: 10px; }
  .s-brand-sub { display: none; }
  .s-right { display: none; }
  .s-left { width: 238px; max-height: calc(100vh - 310px); }
  .s-stage { left: calc(50% + 100px); width: 350px; }
  .s-strip { grid-template-columns: 1fr; right: 12px; left: 12px; }
  .s-strip-events { display: none; }
  .s-dock { bottom: 92px; }
  .welcome-presets { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 720px) {
  .s-topnav { padding: 0 12px; grid-template-columns: auto 1fr auto; }
  .s-nav { justify-self: center; }
  .s-nav-item { font-size: 0; width: 34px; padding: 0; }
  .s-nav-item::first-letter { font-size: 13px; }
  .s-primary-btn { padding-inline: 10px; }
  .s-left { left: 10px; top: 70px; width: min(236px, calc(100vw - 20px)); max-height: 43vh; }
  .s-stage { top: 70px; left: auto; right: 10px; transform: none; width: min(42vw, 250px); text-align: right; }
  .s-stage .s-kicker { justify-content: flex-end; }
  .s-stage-title { font-size: 24px; }
  .s-dock-row { display: none; }
  .s-timeline { padding-right: 8px; gap: 7px; }
  .s-timeline .s-kicker, .s-influence small { display: none; }
  .s-strip { bottom: 10px; }
  .welcome-inner { padding: 36px 16px 24px; }
  .welcome-title { font-size: 50px; }
  .welcome-presets { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .s-civ-row, .s-seg-btn, .s-event, .welcome .preset-card, .s-nav-item { transition: none !important; }
}

/* Release overflow hardening: large deep-future values must not shift panel geometry. */
.s-habitat-pop, .s-habitat-built, .s-facts, .s-civ-row { min-width: 0; }
.s-habitat-pop span, .s-habitat-built i, .s-fact, .s-muted, .s-world-sub { min-width: 0; overflow-wrap: anywhere; }
.city-label { z-index: 1 !important; }