/* Mirai Forge — Civic Theater UI */
:root {
  --forge-bg: #0B1020;
  --forge-bg-2: #0E1530;
  --forge-bg-3: #131B3A;
  --forge-orange: #FF6B35;
  --forge-orange-dim: #C04E20;
  --forge-green: #2DD4BF;
  --forge-cyan: #A7F3D0;
  --forge-cyan-soft: #CFFAE7;
  --forge-paper: #F8FAFC;
  --forge-paper-2: #E5E9F0;
  --forge-amber: #FBBF24;
  --forge-blue: #60A5FA;
  --forge-line: rgba(248, 250, 252, 0.12);
  --forge-line-strong: rgba(248, 250, 252, 0.22);
  --forge-muted: rgba(248, 250, 252, 0.55);
  --forge-muted-2: rgba(248, 250, 252, 0.7);

  /* §10.1 semantic — Five Voices (1:1 with primitive) */
  --agent-gyosei: var(--forge-blue);
  --agent-kankyo: var(--forge-green);
  --agent-kigyo: var(--forge-amber);
  --agent-seikatsu: var(--forge-orange);
  --agent-jisedai: var(--forge-cyan);
}

* { box-sizing: border-box; -webkit-font-smoothing: antialiased; }

html, body, #root {
  margin: 0;
  padding: 0;
  background: var(--forge-bg);
  color: var(--forge-paper);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui, sans-serif;
  font-feature-settings: "palt";
  letter-spacing: 0.01em;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 50% 100%, rgba(255, 107, 53, 0.08), transparent 60%),
    radial-gradient(ellipse 60% 40% at 20% 0%, rgba(45, 212, 191, 0.06), transparent 60%),
    linear-gradient(180deg, #0B1020 0%, #0A0E1C 100%);
}

.serif {
  font-family: "Noto Serif JP", "Yu Mincho", "YuMincho", serif;
}

/* ─────────── Background: Akagi mountain silhouette ─────────── */
.akagi-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.akagi-bg svg {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  min-width: 1600px;
  opacity: 0.5;
}
.akagi-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(248,250,252,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(248,250,252,0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 40%, transparent 90%);
}

/* particles */
.spark {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 999px;
  background: var(--forge-orange);
  box-shadow: var(--forge-orange-glow, 0 0 8px var(--forge-orange));
  opacity: 0;
  animation: sparkRise 8s linear infinite;
}
@keyframes sparkRise {
  0%   { transform: translateY(20px); opacity: 0; }
  10%  { opacity: 0.9; }
  90%  { opacity: 0.4; }
  100% { transform: translateY(-700px); opacity: 0; }
}

.glow-text {
  text-shadow: var(--orange-text-shadow, 0 0 24px rgba(255,107,53,0.4));
}

/* ─────────── Header / step indicator ─────────── */
.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: linear-gradient(180deg, rgba(11,16,32,0.92), rgba(11,16,32,0.4));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--forge-line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-mark {
  width: 36px; height: 36px;
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.brand-text { line-height: 1.1; }
.brand-name {
  font-family: "Noto Serif JP", serif;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.04em;
}
.brand-name em {
  color: var(--forge-orange);
  font-style: normal;
}
.brand-sub {
  font-size: 11px;
  color: var(--forge-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.step-indicator {
  display: flex;
  align-items: center;
  gap: 0;
  font-size: 12px;
}
.step-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  color: var(--forge-muted);
  position: relative;
  transition: color 0.4s;
  white-space: nowrap;
}
.step-item.active {
  color: var(--forge-paper);
}
.step-item.done {
  color: var(--forge-green);
}
.step-num {
  width: 22px; height: 22px;
  border-radius: 999px;
  border: 1px solid currentColor;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px;
  font-feature-settings: "tnum";
}
.step-item.active .step-num {
  background: var(--forge-orange);
  border-color: var(--forge-orange);
  color: #0B1020;
  box-shadow: 0 0 14px rgba(255,107,53,0.5);
}
.step-item.done .step-num {
  background: var(--forge-green);
  border-color: var(--forge-green);
  color: #0B1020;
}
.step-sep {
  width: 18px; height: 1px;
  background: var(--forge-line);
}

/* ─────────── Footer / principle bar ─────────── */
.app-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 40;
  padding: 12px 32px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--forge-muted);
  background: linear-gradient(0deg, rgba(11,16,32,0.92), rgba(11,16,32,0.0));
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}
.app-footer .principle {
  display: flex; gap: 16px; align-items: center;
}
.app-footer .principle .dot {
  width: 5px; height: 5px; border-radius: 999px;
  background: var(--forge-orange);
  box-shadow: 0 0 8px var(--forge-orange);
}

/* ─────────── Stage ─────────── */
.stage {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 96px 32px 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.stage-narrow {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* scene transitions */
.scene-enter { animation: sceneIn 0.7s cubic-bezier(.2,.7,.2,1) both; }
@keyframes sceneIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─────────── Buttons ─────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 4px;
  border: 1px solid transparent;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  font-weight: 500;
  transition: transform .15s, box-shadow .2s, background .2s;
  letter-spacing: 0.04em;
}
.btn-primary {
  background: linear-gradient(180deg, var(--forge-orange), var(--forge-orange-dim));
  color: #0B1020;
  box-shadow: 0 0 32px rgba(255,107,53,0.35), inset 0 1px 0 rgba(255,255,255,0.3);
  font-weight: 600;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 0 48px rgba(255,107,53,0.55), inset 0 1px 0 rgba(255,255,255,0.4); }
.btn-ghost {
  background: transparent;
  color: var(--forge-paper);
  border-color: var(--forge-line-strong);
}
.btn-ghost:hover { background: rgba(248,250,252,0.06); }

/* ─────────── Type ─────────── */
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--forge-orange);
  font-weight: 600;
}
.scene-caption {
  font-size: 13px;
  color: var(--forge-muted-2);
  letter-spacing: 0.06em;
  margin-bottom: 28px;
}

/* ─────────── Source badges ─────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 3px;
  font-size: 10px;
  letter-spacing: 0.08em;
  font-weight: 600;
  border: 1px solid;
  white-space: nowrap;
}
.badge-official { color: var(--forge-blue); border-color: rgba(96,165,250,0.4); background: rgba(96,165,250,0.08); }
.badge-open     { color: var(--forge-green); border-color: rgba(45,212,191,0.4); background: rgba(45,212,191,0.08); }
.badge-hyp      { color: var(--forge-amber); border-color: rgba(251,191,36,0.4); background: rgba(251,191,36,0.08); }
.badge-claim    { color: var(--forge-orange); border-color: rgba(255,107,53,0.4); background: rgba(255,107,53,0.08); }
.badge-soon     { color: var(--forge-muted); border-color: var(--forge-line); background: transparent; }

/* ─────────── Cards ─────────── */
.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015));
  border: 1px solid var(--forge-line);
  border-radius: 6px;
  padding: 20px;
  position: relative;
}
.card-hover { transition: border-color .2s, transform .2s; cursor: pointer; }
.card-hover:hover { border-color: var(--forge-line-strong); transform: translateY(-2px); }
.card-locked { opacity: 0.4; cursor: not-allowed; }
.card-locked:hover { transform: none; }

/* tick mark on top */
.card::before {
  content: "";
  position: absolute;
  top: -1px; left: 12px;
  width: 24px; height: 2px;
  background: var(--forge-orange);
  opacity: 0.7;
}

.divider {
  height: 1px;
  background: var(--forge-line);
  margin: 14px 0;
}
.divider-strong { background: var(--forge-line-strong); }

/* utility text */
.muted { color: var(--forge-muted); }
.muted-2 { color: var(--forge-muted-2); }
.tnum { font-feature-settings: "tnum"; }

/* spark animation utility */
.glow-text {
  text-shadow: 0 0 24px rgba(255,107,53,0.4);
}

/* tick / cross icons */
.tag-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* progress bar */
.progress {
  width: 100%; height: 2px;
  background: var(--forge-line);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}
.progress-bar {
  position: absolute; top: 0; left: 0; bottom: 0;
  background: linear-gradient(90deg, var(--forge-orange), var(--forge-cyan));
  transform-origin: left;
}

/* ─────────── AGENT CARDS ─────────── */
.agent-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  width: 100%;
}
.agent-card {
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 320px;
  position: relative;
  overflow: hidden;
}
.agent-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 6px;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(255,107,53,0.08));
  opacity: 0;
  transition: opacity .3s;
}
.agent-card.entered::after { opacity: 1; }

.agent-head {
  display: flex; align-items: center; gap: 10px;
}
.agent-icon {
  width: 32px; height: 32px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,107,53,0.1);
  border: 1px solid rgba(255,107,53,0.3);
  color: var(--forge-orange);
}
.agent-icon[data-agent-id="admin"]    { background: rgba(96,165,250,0.10); border-color: rgba(96,165,250,0.30); color: var(--agent-gyosei); }
.agent-icon[data-agent-id="env"]      { background: rgba(45,212,191,0.10); border-color: rgba(45,212,191,0.30); color: var(--agent-kankyo); }
.agent-icon[data-agent-id="biz"]      { background: rgba(251,191,36,0.10); border-color: rgba(251,191,36,0.30); color: var(--agent-kigyo); }
.agent-icon[data-agent-id="citizen"]  { background: rgba(255,107,53,0.10); border-color: rgba(255,107,53,0.30); color: var(--agent-seikatsu); }
.agent-icon[data-agent-id="next_gen"] { background: rgba(167,243,208,0.10); border-color: rgba(167,243,208,0.30); color: var(--agent-jisedai); }
.agent-name {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
}
.agent-sub {
  font-size: 10px;
  color: var(--forge-muted);
  letter-spacing: 0.06em;
  margin-top: 2px;
}
.agent-stance {
  display: inline-block;
  padding: 2px 8px;
  font-size: 10px;
  border-radius: 3px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.stance-推進 { background: rgba(45,212,191,0.15); color: var(--forge-green); }
.stance-条件付き推進 { background: rgba(96,165,250,0.15); color: var(--forge-blue); }
.stance-懸念 { background: rgba(251,191,36,0.15); color: var(--forge-amber); }
.stance-代替案 { background: rgba(255,107,53,0.18); color: var(--forge-orange); }

.agent-claim {
  font-size: 14px;
  line-height: 1.55;
  color: var(--forge-paper);
  font-weight: 500;
  text-wrap: pretty;
}

.agent-evidence-block {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--forge-line);
}
.agent-evidence-block-label {
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--forge-muted);
  margin-bottom: 6px;
}

/* ─────────── ISSUE MAP ─────────── */
.issue-map {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.issue-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 0;
  align-items: stretch;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--forge-line);
  border-radius: 6px;
  overflow: hidden;
}
.issue-side {
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.issue-side-label {
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--forge-muted);
  text-transform: uppercase;
}
.issue-center {
  background: linear-gradient(180deg, rgba(255,107,53,0.08), rgba(255,107,53,0.02));
  border-left: 1px solid var(--forge-line);
  border-right: 1px solid var(--forge-line);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.issue-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  text-wrap: balance;
}
.agent-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--forge-line-strong);
  border-radius: 999px;
  font-size: 11px;
  background: rgba(255,255,255,0.03);
}
.agent-chip-supporter { border-color: rgba(45,212,191,0.4); color: var(--forge-green); }
.agent-chip-objector  { border-color: rgba(251,191,36,0.4); color: var(--forge-amber); }
.agent-chip-conditional { border-color: rgba(96,165,250,0.4); color: var(--forge-blue); }

/* ─────────── LETTER ─────────── */
.letter-stage {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 0;
}
.letter {
  max-width: 760px;
  width: 100%;
  background:
    linear-gradient(180deg, rgba(207, 250, 231, 0.96) 0%, rgba(184, 240, 220, 0.92) 100%);
  color: #0B1020;
  border-radius: 6px;
  padding: 56px 64px 48px;
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  position: relative;
  box-shadow:
    0 0 0 1px rgba(167, 243, 208, 0.2),
    0 30px 80px -20px rgba(0,0,0,0.6),
    0 0 80px rgba(167, 243, 208, 0.1);
  line-height: 2;
}
.letter::before {
  content: "";
  position: absolute;
  top: 14px; left: 14px; right: 14px; bottom: 14px;
  border: 1px solid rgba(11, 16, 32, 0.12);
  border-radius: 3px;
  pointer-events: none;
}
.letter-meta {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(11,16,32,0.55);
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
}
.letter-from {
  font-family: "Noto Serif JP", serif;
  font-size: 13px;
  color: rgba(11,16,32,0.7);
  margin-bottom: 10px;
}
.letter-p {
  font-size: 15px;
  line-height: 2;
  margin: 0 0 14px;
  text-wrap: pretty;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 1s, transform 1s;
  color: #0B1020;
}
.letter-p.visible { opacity: 1; transform: translateY(0); }
.letter-closing {
  margin-top: 36px;
  text-align: center;
  font-family: "Noto Serif JP", serif;
  font-size: 26px;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: #0B1020;
  line-height: 1.6;
  opacity: 0;
  transition: opacity 1.2s;
  text-wrap: balance;
}
.letter-closing.visible { opacity: 1; }
.letter-closing::before, .letter-closing::after {
  content: "「";
  display: inline;
  color: rgba(11,16,32,0.4);
}
.letter-closing::after { content: "」"; }
.letter-disclaimer {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(11,16,32,0.12);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 11px;
  line-height: 1.7;
  color: rgba(11,16,32,0.5);
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity 1s;
}
.letter-disclaimer.visible { opacity: 1; }
.letter-disclaimer-label {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid rgba(11,16,32,0.3);
  border-radius: 3px;
  font-size: 10px;
  letter-spacing: 0.18em;
  margin-right: 10px;
  font-weight: 700;
  color: rgba(11,16,32,0.65);
}

/* ─────────── COMPARISON 3-col ─────────── */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr 1fr;
  gap: 14px;
  width: 100%;
  align-items: stretch;
}
.compare-col {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--forge-line);
  border-radius: 6px;
  background: rgba(255,255,255,0.02);
  overflow: hidden;
}
.compare-col-letter {
  border-color: rgba(167,243,208,0.4);
  background: linear-gradient(180deg, rgba(167,243,208,0.06), rgba(167,243,208,0.01));
  box-shadow: 0 0 32px rgba(167,243,208,0.05);
}
.compare-head {
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--forge-line);
}
.compare-eyebrow {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--forge-muted);
  text-transform: uppercase;
}
.compare-eyebrow .ja {
  color: var(--forge-paper);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: none;
  margin-right: 8px;
  font-size: 12px;
}
.compare-summary-label {
  margin-top: 8px;
  font-size: 16px;
  line-height: 1.45;
  font-weight: 700;
  text-wrap: balance;
  min-height: 3em;
  font-family: "Noto Serif JP", serif;
}
.compare-col-letter .compare-summary-label {
  color: var(--forge-cyan);
  text-shadow: 0 0 24px rgba(167,243,208,0.3);
  font-size: 18px;
}
.compare-body {
  padding: 16px 18px 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 12.5px;
  line-height: 1.6;
}
.compare-key {
  display: flex; align-items: flex-start; gap: 8px;
  color: var(--forge-paper);
}
.compare-key .dot {
  width: 5px; height: 5px; border-radius: 999px;
  background: var(--forge-orange);
  margin-top: 8px;
  flex-shrink: 0;
}
.compare-col-letter .compare-key .dot { background: var(--forge-cyan); }

.changes-from-letter {
  margin-top: 10px;
  padding: 12px;
  background: rgba(255,107,53,0.06);
  border: 1px dashed rgba(255,107,53,0.4);
  border-radius: 4px;
}
.changes-from-letter .label {
  font-size: 10px;
  color: var(--forge-orange);
  letter-spacing: 0.16em;
  margin-bottom: 8px;
  font-weight: 700;
}
.changes-from-letter ul {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-direction: column; gap: 6px;
}
.changes-from-letter li {
  font-size: 12px;
  line-height: 1.55;
  padding-left: 18px;
  position: relative;
  color: var(--forge-paper);
}
.changes-from-letter li::before {
  content: "→";
  position: absolute; left: 0; top: 0;
  color: var(--forge-orange);
  font-weight: 700;
}

/* ─────────── ACCORD DRAFT (Sceneshare 6b) ─────────── */
.accord {
  width: 100%;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.005));
  border: 1px solid var(--forge-line-strong);
  border-radius: 4px;
  padding: 32px 36px;
  position: relative;
}
.accord::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid var(--forge-line);
  border-radius: 2px;
  pointer-events: none;
}
.accord-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--forge-line);
}
.accord-title {
  font-family: "Noto Serif JP", serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.accord-meta {
  text-align: right;
  font-size: 11px;
  color: var(--forge-muted);
  letter-spacing: 0.1em;
  line-height: 1.7;
}
.accord-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 36px;
}
.accord-section {
  font-size: 13px;
}
.accord-section h4 {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--forge-orange);
  text-transform: uppercase;
  margin: 0 0 8px;
  font-weight: 700;
}
.accord-section h4 .num {
  display: inline-block;
  width: 20px;
  color: var(--forge-muted);
}
.accord-section ul, .accord-section p {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.7;
  color: var(--forge-paper);
}
.accord-section ul li {
  padding-left: 14px;
  position: relative;
  margin-bottom: 4px;
}
.accord-section ul li::before {
  content: "—";
  position: absolute; left: 0;
  color: var(--forge-muted);
}
.accord-section.full { grid-column: 1 / -1; }

/* tweaks panel default appearance */

/* ─────────── Loading state ─────────── */
.loader-row {
  display: flex; align-items: center; gap: 10px;
  font-size: 12px; color: var(--forge-muted);
}
.loader-dot {
  width: 6px; height: 6px;
  border-radius: 999px;
  background: var(--forge-orange);
  animation: loaderPulse 1.4s infinite ease-in-out;
}
.loader-dot:nth-child(2) { animation-delay: 0.2s; }
.loader-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes loaderPulse {
  0%, 100% { transform: scale(0.6); opacity: 0.4; }
  50% { transform: scale(1.2); opacity: 1; }
}

/* utility for forge core spinner */
.forge-core {
  width: 220px;
  height: 220px;
  border-radius: 999px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}
.forge-ring {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  border: 1px solid var(--forge-line);
}
.forge-ring-2 {
  position: absolute;
  inset: 20px;
  border-radius: 999px;
  border: 1px solid var(--forge-line);
}
.forge-ring-3 {
  position: absolute;
  inset: 40px;
  border-radius: 999px;
  border: 1px dashed rgba(255,107,53,0.3);
  animation: ringSpin 24s linear infinite;
}
@keyframes ringSpin { to { transform: rotate(360deg); } }
.forge-core-label {
  text-align: center;
  font-family: "Noto Serif JP", serif;
}

/* navigation arrows fixed at bottom corners */
.nav-fab {
  position: fixed;
  bottom: 48px;
  right: 32px;
  z-index: 60;
  display: flex;
  gap: 10px;
  pointer-events: auto;
}
.nav-fab .btn { padding: 10px 16px; font-size: 13px; }

.scene-skip {
  position: fixed;
  bottom: 48px;
  left: 32px;
  z-index: 60;
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 11px;
  color: var(--forge-muted);
  letter-spacing: 0.08em;
}
.scene-skip kbd {
  font-family: inherit;
  padding: 2px 6px;
  border: 1px solid var(--forge-line-strong);
  border-radius: 3px;
  font-size: 10px;
  color: var(--forge-paper);
  background: rgba(255,255,255,0.04);
}