/* ════════════════════════════════════════════════════════════
   Onboarding — charter-style first run
   ════════════════════════════════════════════════════════════ */
.ob-bg {
  position: fixed; inset: 0;
  background: color-mix(in oklab, #000 55%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  display: flex; align-items: center; justify-content: center;
  z-index: 9500;
  padding: 18px;
  animation: smFade var(--dur-fast) var(--ease-standard);
  font-family: var(--font-serif, 'Georgia', serif);
}
.ob-paper {
  width: min(420px, 100%);
  max-height: 92vh;
  overflow: auto;
  background: var(--bg-1);
  background-image: repeating-linear-gradient(transparent 0 28px,
    color-mix(in oklab, var(--text-3) 8%, transparent) 28px 29px);
  background-position: 0 96px;
  border: 0.5px solid var(--border-strong, var(--border));
  border-radius: 4px;
  color: var(--text-1);
  padding: 16px 24px 18px;
  box-shadow: var(--shadow-overlay, 0 60px 120px rgba(0,0,0,0.6));
  animation: smRise var(--dur-slow) var(--ease-spring-soft);
}
.ob-mast {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 2px double var(--border-strong, var(--border));
  padding-bottom: 6px;
}
.ob-fileno {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-3);
}
.ob-skip {
  background: transparent; border: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
  cursor: pointer;
}
.ob-skip:hover { color: var(--text-1); }

.ob-art {
  margin: 18px auto 6px;
  width: 100%;
  max-width: 280px;
  aspect-ratio: 200/120;
}

.ob-eb {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-paper, #d9b25c);
  margin-top: 8px;
}
.ob-title {
  font-family: var(--font-serif, 'Georgia', serif);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin: 6px 0 10px;
  color: var(--text-1);
}
.ob-body {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-2);
  text-wrap: pretty;
  margin: 0 0 14px;
}

.ob-dots {
  display: flex; gap: 8px;
  justify-content: center;
  margin: 6px 0 14px;
}
.ob-dot {
  width: 22px; height: 3px;
  background: color-mix(in oklab, var(--text-3) 30%, transparent);
  transition: background var(--dur-fast) var(--ease-standard), width var(--dur-fast);
}
.ob-dot.on   { background: var(--text-1); width: 28px; }
.ob-dot.done { background: color-mix(in oklab, var(--text-2) 60%, transparent); }

.ob-foot { display: flex; gap: 10px; }
.ob-btn {
  flex: 1;
  padding: 10px 12px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  border: 0.5px solid var(--border-strong, var(--border));
  background: transparent;
  color: var(--text-2);
  transition: transform var(--dur-fast), background var(--dur-fast), color var(--dur-fast);
}
.ob-btn:hover { color: var(--text-1); }
.ob-btn:active { transform: scale(0.97); }
.ob-btn.primary {
  background: var(--text-1);
  color: var(--bg-1);
  border-color: var(--text-1);
}
.ob-btn.primary:hover {
  background: var(--accent-paper, #d9b25c);
  border-color: var(--accent-paper, #d9b25c);
  color: #000;
}