/* about-modal.css — About trigger + overlay
   CHANGED(2026-03-27): 3 repo 統一スタイル (as repo 準拠) */

/* ── Trigger button ── */
.about-trigger {
  margin-top: 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow:
    0 10px 24px rgba(0, 0, 0, 0.18),
    0 0 20px rgba(120, 155, 220, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  color: rgba(var(--color-heading, 255, 255, 255), 0.96);
  cursor: pointer;
  pointer-events: auto;
  padding: 0;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.about-trigger:hover,
.about-trigger:focus-visible {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow:
    0 14px 34px rgba(0, 0, 0, 0.22),
    0 0 26px rgba(132, 168, 232, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.about-trigger:focus-visible {
  outline: 2px solid var(--kesson-focus-ring, rgba(100, 150, 255, 0.86));
  outline-offset: 2px;
}

.about-trigger__letter {
  font-family: var(--kesson-font-serif-display, 'Noto Serif JP', serif);
  font-size: 1.2rem;
  font-style: italic;
  line-height: 1;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 0 10px rgba(180, 208, 255, 0.25);
  transform: translateY(-1px);
}

/* ── Overlay ── */
#about-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(5, 10, 20, 0);
  transition: background 0.4s ease;
  cursor: pointer;
}

#about-overlay.visible {
  display: flex;
}

#about-overlay.open {
  background: rgba(5, 10, 20, 0.5);
}

/* ── Glass panel ── */
.about-glass {
  position: relative;
  width: 90vw;
  max-width: 560px;
  max-height: 80vh;
  cursor: default;
  overflow-y: auto;
  background: var(--kesson-viewer-glass-bg, rgba(12, 18, 30, 0.88));
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(100, 150, 255, 0.06);
  border-radius: 3px;
  box-shadow: var(--kesson-viewer-glass-shadow,
    0 0 60px rgba(0, 0, 0, 0.4),
    0 0 120px rgba(30, 60, 120, 0.1),
    inset 0 0 60px rgba(20, 40, 80, 0.05));
  padding: 2.5rem 2rem 2rem;
  opacity: 0;
  transform: scale(0.92) translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

#about-overlay.open .about-glass {
  opacity: 1;
  transform: scale(1) translateY(0);
}

/* ── Close button ── */
.about-close {
  position: absolute;
  top: 10px;
  right: 12px;
  background: none;
  border: none;
  color: rgba(var(--color-heading, 255, 255, 255), 0.25);
  font-size: 1.4rem;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s;
  z-index: 10;
  padding: 0;
}

.about-close:hover {
  color: rgba(var(--color-heading, 255, 255, 255), 0.6);
}

.about-close:focus-visible {
  outline: 2px solid var(--kesson-focus-ring, rgba(100, 150, 255, 0.86));
  outline-offset: 2px;
}

/* ── Title ── */
.about-title {
  font-family: var(--kesson-font-serif-display, serif);
  font-size: 1.15rem;
  color: rgba(var(--color-heading, 255, 255, 255), 0.92);
  letter-spacing: 0.08em;
  margin: 0 0 1.5rem;
  line-height: 1.4;
}

/* ── Body ── */
.about-body {
  font-family: var(--kesson-font-serif-display, serif);
  font-size: 0.9rem;
  color: rgba(var(--color-highlight, 220, 230, 245), 0.82);
  line-height: 1.9;
  letter-spacing: 0.02em;
}

.about-body p {
  margin: 0 0 1.2em;
}

.about-body p:last-child {
  margin-bottom: 0;
}

.about-stages {
  display: block;
  text-align: center;
  font-family: var(--kesson-font-serif-ui, serif);
  font-size: 0.88rem;
  color: rgba(var(--color-accent, 100, 150, 255), 0.7);
  letter-spacing: 0.12em;
  margin: 0.8em 0;
}

/* Scrollbar */
.about-glass::-webkit-scrollbar {
  width: 3px;
}

.about-glass::-webkit-scrollbar-track {
  background: transparent;
}

.about-glass::-webkit-scrollbar-thumb {
  background: rgba(var(--color-accent, 100, 150, 255), 0.12);
  border-radius: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .about-glass,
  #about-overlay {
    transition: none;
  }
}

@media (max-width: 600px) {
  .about-glass {
    width: 94vw;
    padding: 2rem 1.4rem 1.5rem;
  }

  .about-title {
    font-size: 1.05rem;
  }

  .about-body {
    font-size: 0.86rem;
  }
}