.page-about { --about-index-w: 220px; --about-timeline-gap: 32px; }
.page-about .about-breadcrumb { display: flex; align-items: center; gap: 8px; padding-top: 20px; font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.04em; color: var(--text-sub); }
.page-about .about-breadcrumb a { color: var(--accent); text-decoration: none; transition: color 0.2s ease; }
.page-about .about-breadcrumb a:hover { color: var(--accent-soft); }
.page-about .about-hero { position: relative; display: flex; flex-direction: column; gap: 28px; padding: 52px 0 44px; border-bottom: 1px solid var(--line); }
.page-about .about-hero__copy { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.page-about .about-hero__copy h1 { margin: 0; font-family: var(--font-display); font-size: clamp(2rem, 6vw, 3.75rem); font-weight: 700; line-height: 1.12; letter-spacing: -0.01em; color: var(--text-main); max-width: 18em; }
.page-about .about-hero__copy p { margin: 0; max-width: 58ch; color: var(--text-sub); font-size: 1rem; line-height: 1.8; }
.page-about .about-hero__mark { display: flex; align-items: flex-end; justify-content: flex-end; gap: 14px; }
.page-about .about-hero__num { font-family: var(--font-display); font-size: clamp(4rem, 14vw, 7.5rem); font-weight: 200; line-height: 0.78; color: var(--accent); opacity: 0.16; user-select: none; }
.page-about .about-hero__rule { width: 96px; height: 2px; margin-bottom: 10px; background: linear-gradient(90deg, var(--warm), transparent); }
.page-about .about-layout { display: block; }
.page-about .about-toc { display: none; }
.page-about .about-main { min-width: 0; }
.page-about .about-section { padding: 52px 0 32px; border-bottom: 1px solid var(--line); scroll-margin-top: calc(var(--header-h) + 20px); }
.page-about .about-section__head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 28px; }
.page-about .about-section__index { font-family: var(--font-display); font-size: clamp(2.6rem, 8vw, 4.6rem); font-weight: 200; line-height: 0.85; color: var(--accent); opacity: 0.55; user-select: none; }
.page-about .about-section__head h2 { margin: 0; font-family: var(--font-display); font-size: clamp(1.5rem, 3.4vw, 2.25rem); font-weight: 700; line-height: 1.1; color: var(--text-main); }
.page-about .about-file { display: grid; gap: 32px; }
.page-about .about-file__text { display: flex; flex-direction: column; gap: 22px; }
.page-about .about-file__text > p { margin: 0; color: var(--text-sub); line-height: 1.85; font-size: 0.95rem; }
.page-about .about-file__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.page-about .about-file__list li { position: relative; padding-left: 20px; color: var(--text-main); font-size: 0.9rem; line-height: 1.65; }
.page-about .about-file__list li::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 8px; height: 8px; background: var(--accent); transform: rotate(45deg); }
.page-about .about-file__stats { display: flex; gap: 12px; flex-wrap: wrap; }
.page-about .about-file__stat { flex: 1; min-width: 92px; padding: 16px 12px; background: var(--bg-panel); border: 1px solid var(--line); text-align: center; transition: border-color 0.2s ease; }
.page-about .about-file__stat:hover { border-color: var(--accent-soft); }
.page-about .about-file__num { display: block; font-family: var(--font-mono); font-size: 1.7rem; font-weight: 700; color: var(--accent); letter-spacing: -0.02em; }
.page-about .about-file__label { display: block; margin-top: 5px; font-size: 0.72rem; color: var(--text-sub); }
.page-about .about-file__figure { margin: 0; position: relative; }
.page-about .about-file__figure img { display: block; width: 100%; height: auto; max-height: 460px; object-fit: cover; border: 1px solid var(--line); }
.page-about .about-file__figure figcaption { margin-top: 10px; font-size: 0.8rem; color: var(--text-sub); line-height: 1.5; }
.page-about .about-timeline { position: relative; margin: 0; padding: 8px 0 8px 28px; border-left: 1px solid var(--line); }
.page-about .about-timeline__item { position: relative; padding: 0 0 32px 18px; }
.page-about .about-timeline__item:last-child { padding-bottom: 4px; }
.page-about .about-timeline__marker { position: absolute; left: -37px; top: 6px; width: 18px; height: 18px; background: var(--accent); transform: rotate(45deg); box-shadow: 0 0 0 4px var(--bg-base); transition: transform 0.2s ease, box-shadow 0.2s ease; }
.page-about .about-timeline__item:hover .about-timeline__marker, .page-about .about-timeline__item:focus-within .about-timeline__marker { transform: rotate(45deg) scale(1.12); box-shadow: 0 0 0 4px var(--bg-panel), 0 0 18px rgba(198, 255, 0, 0.5); }
.page-about .about-timeline__tip { position: absolute; left: 100%; top: 50%; z-index: 2; white-space: nowrap; padding: 5px 9px; background: var(--bg-deep); border: 1px solid var(--line); color: var(--accent); font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.04em; opacity: 0; transform: translateY(-50%) translateX(-6px); pointer-events: none; transition: opacity 0.2s ease, transform 0.2s ease; }
.page-about .about-timeline__item:hover .about-timeline__tip, .page-about .about-timeline__item:focus-within .about-timeline__tip { opacity: 1; transform: translateY(-50%) translateX(0); }
.page-about .about-timeline__card { background: var(--bg-panel); border: 1px solid var(--line); padding: 18px 20px; transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease; }
.page-about .about-timeline__item:hover .about-timeline__card, .page-about .about-timeline__item:focus-within .about-timeline__card { transform: translateY(-2px); border-color: var(--accent-soft); box-shadow: var(--shadow-glow); }
.page-about .about-timeline__stage { display: inline-block; margin-bottom: 6px; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--warm); text-transform: uppercase; }
.page-about .about-timeline__card h3 { margin: 0 0 8px; font-size: 1.15rem; line-height: 1.3; color: var(--text-main); }
.page-about .about-timeline__card p { margin: 0; color: var(--text-sub); font-size: 0.88rem; line-height: 1.7; }
.page-about .about-capabilities__intro { max-width: 60ch; margin: 0 0 24px; color: var(--text-sub); line-height: 1.75; font-size: 0.95rem; }
.page-about .about-capabilities__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 24px; }
.page-about .about-capability-card { position: relative; background: var(--bg-panel); border: 1px solid var(--line); padding: 20px 16px 18px; transition: transform 0.2s ease, border-color 0.2s ease; }
.page-about .about-capability-card:hover { transform: translateY(-2px); border-color: var(--accent-soft); }
.page-about .about-capability-card::after { content: ""; position: absolute; left: 0; bottom: 0; width: 40%; height: 2px; background: linear-gradient(90deg, var(--accent), transparent); transition: width 0.25s ease; }
.page-about .about-capability-card:hover::after { width: 100%; }
.page-about .about-capability-card__num { display: block; margin-bottom: 10px; font-family: var(--font-mono); font-size: 2rem; font-weight: 700; line-height: 1; color: var(--accent); letter-spacing: -0.03em; }
.page-about .about-capability-card:nth-child(4n) .about-capability-card__num { color: var(--warm); }
.page-about .about-capability-card h3 { margin: 0 0 8px; font-size: 1rem; line-height: 1.3; color: var(--text-main); }
.page-about .about-capability-card p { margin: 0; font-size: 0.84rem; line-height: 1.65; color: var(--text-sub); }
.page-about .about-details { margin-bottom: 24px; background: var(--bg-deep); border: 1px solid var(--line); }
.page-about .about-details summary { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; cursor: pointer; list-style: none; font-size: 0.9rem; color: var(--accent); transition: background 0.2s ease; }
.page-about .about-details summary::-webkit-details-marker { display: none; }
.page-about .about-details summary:hover { background: rgba(198, 255, 0, 0.04); }
.page-about .about-details summary::after { content: "+"; font-family: var(--font-mono); font-size: 1rem; color: var(--warm); }
.page-about .about-details[open] summary::after { content: "–"; }
.page-about .about-details__grid { display: grid; gap: 18px; padding: 4px 16px 20px; }
.page-about .about-details__col h4 { margin: 0 0 6px; font-size: 0.92rem; color: var(--text-main); }
.page-about .about-details__col p { margin: 0; font-size: 0.84rem; line-height: 1.7; color: var(--text-sub); }
.page-about .about-capabilities__figure { margin: 0; text-align: center; }
.page-about .about-capabilities__figure img { display: block; width: 100%; height: auto; max-width: 460px; margin: 0 auto; object-fit: cover; border: 1px solid var(--line); }
.page-about .about-capabilities__figure figcaption { margin-top: 10px; font-size: 0.8rem; color: var(--text-sub); }
.page-about .about-value { display: grid; gap: 32px; }
.page-about .about-value__figure { margin: 0; }
.page-about .about-value__figure img { display: block; width: 100%; height: auto; max-height: 360px; object-fit: cover; border: 1px solid var(--line); }
.page-about .about-value__figure figcaption { margin-top: 10px; font-size: 0.8rem; color: var(--text-sub); }
.page-about .about-value__list { display: grid; gap: 12px; }
.page-about .about-value-item { display: flex; gap: 16px; padding: 16px 14px; background: var(--bg-panel); border: 1px solid var(--line); transition: border-color 0.2s ease, transform 0.2s ease; }
.page-about .about-value-item:hover { border-color: var(--accent-soft); transform: translateX(2px); }
.page-about .about-value-item__index { font-family: var(--font-mono); font-size: 0.8rem; color: var(--warm); line-height: 1.6; min-width: 2em; }
.page-about .about-value-item__body h3 { margin: 0 0 6px; font-size: 1rem; color: var(--text-main); }
.page-about .about-value-item__body p { margin: 0; font-size: 0.85rem; line-height: 1.7; color: var(--text-sub); }
.page-about .about-privacy { display: grid; gap: 24px; }
.page-about .about-privacy__text > p { margin: 0 0 16px; max-width: 60ch; color: var(--text-sub); line-height: 1.8; font-size: 0.95rem; }
.page-about .about-privacy__list { list-style: none; margin: 0 0 20px; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.page-about .about-privacy__list li { position: relative; padding-left: 20px; color: var(--text-main); font-size: 0.9rem; line-height: 1.6; }
.page-about .about-privacy__list li::before { content: ""; position: absolute; left: 0; top: 0.5em; width: 8px; height: 8px; background: var(--warm); }
.page-about .about-privacy__links { display: flex; flex-wrap: wrap; gap: 18px; }
.page-about .about-privacy__links .link-monoline { font-size: 0.88rem; }
.page-about .about-privacy__note { padding: 22px 20px; background: var(--bg-deep); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 12px; }
.page-about .about-privacy__service { margin: 0; font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent); }
.page-about .about-privacy__slogan { margin: 0; font-size: 0.92rem; color: var(--text-main); }
.page-about .about-privacy__commit { margin: 0; font-size: 0.84rem; line-height: 1.7; color: var(--text-sub); }
.page-about .about-next { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 40px 0 56px; }
.page-about .about-next a { display: flex; flex-direction: column; gap: 6px; padding: 18px 16px; text-decoration: none; background: var(--bg-panel); border: 1px solid var(--line); transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease; }
.page-about .about-next a:hover { border-color: var(--accent); transform: translateY(-2px); background: rgba(198, 255, 0, 0.04); }
.page-about .about-next__label { font-size: 0.74rem; color: var(--text-sub); }
.page-about .about-next__title { font-family: var(--font-display); font-size: 1.15rem; font-weight: 700; color: var(--text-main); }
@media (min-width: 640px) {
  .page-about .about-file { grid-template-columns: 1fr 1fr; align-items: start; }
  .page-about .about-file__figure img { height: 100%; max-height: 420px; }
  .page-about .about-value { grid-template-columns: 1fr; }
  .page-about .about-privacy { grid-template-columns: 1.2fr 0.8fr; align-items: start; }
}
@media (min-width: 1024px) {
  .page-about .about-layout { display: grid; grid-template-columns: var(--about-index-w) minmax(0, 1fr); gap: 48px; align-items: start; }
  .page-about .about-toc { display: flex; flex-direction: column; gap: 4px; position: sticky; top: calc(var(--header-h) + 28px); }
  .page-about .about-toc__link { display: flex; align-items: baseline; gap: 10px; padding: 10px 8px; text-decoration: none; color: var(--text-sub); border-left: 2px solid var(--line); transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease; }
  .page-about .about-toc__link:hover { color: var(--text-main); border-left-color: var(--accent-soft); }
  .page-about .about-toc__link.is-active { color: var(--accent); border-left-color: var(--accent); background: linear-gradient(90deg, rgba(198, 255, 0, 0.06), transparent); }
  .page-about .about-toc__idx { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; }
  .page-about .about-toc__name { font-size: 0.88rem; }
  .page-about .about-main { min-width: 0; }
  .page-about .about-section { padding: 64px 0 40px; }
  .page-about .about-value { grid-template-columns: 1.1fr 1fr; align-items: center; }
  .page-about .about-capabilities__grid { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .page-about * { transition: none !important; scroll-behavior: auto !important; }
}