:root {
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: #1b1a18;
  background: #f7f1ed;
  font-synthesis: none;
  text-rendering: geometricPrecision;
  --canvas-media: #f7f1ed;
  --ink-primary: #1b1a18;
  --ink-secondary: #655f5c;
  --ink-tertiary: #8d8581;
  --ink-orientation: #746a72;
  --ink-judgment: #59495f;
  --line: rgba(69, 57, 52, 0.13);
  --line-strong: rgba(27, 26, 24, 0.30);
  --accent: #73577b;
  --accent-soft: rgba(115, 87, 123, 0.075);
  --surface-reading: rgba(255, 253, 251, 0.76);
  --surface-reading-tail: rgba(250, 244, 240, 0.62);
  --surface-reading-edge: rgba(115, 87, 123, 0.18);
  --surface-sticky: rgba(255, 253, 251, 0.94);
  --header-height: 72px;
  --content-left: clamp(24px, 3.6vw, 52px);
  --number-column: 60px;
  --column-gap: 14px;
}

* { box-sizing: border-box; }
html { min-width: 320px; min-height: 100%; scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; min-height: 100%; overflow-x: hidden; background: var(--canvas-media); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.28em; }

.skip-link { position: fixed; z-index: 20; top: 12px; left: 12px; padding: 10px 14px; background: var(--ink-primary); color: var(--canvas-media); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.portrait-layer { position: fixed; z-index: 1; inset: 0; overflow: hidden; pointer-events: none; background: var(--canvas-media); }
.portrait-video { position: absolute; top: 50%; right: -2vw; width: min(69vw, 1060px); height: auto; aspect-ratio: 16 / 9; object-fit: contain; object-position: right center; background: var(--canvas-media); transform: translateY(-50%); -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 76%, rgba(0, 0, 0, 0.88) 84%, transparent 97%); mask-image: linear-gradient(to bottom, #000 0%, #000 76%, rgba(0, 0, 0, 0.88) 84%, transparent 97%); }
.portrait-blend {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, var(--canvas-media) 0%, var(--canvas-media) 36%, rgba(247, 241, 237, 0.92) 44%, rgba(247, 241, 237, 0.48) 53%, rgba(247, 241, 237, 0.04) 66%, rgba(247, 241, 237, 0) 75%),
    linear-gradient(180deg, rgba(247, 241, 237, 0.16), transparent 12%, transparent 88%, rgba(247, 241, 237, 0.16));
}

.site-header { position: fixed; z-index: 8; inset: 0 0 auto; height: var(--header-height); display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 var(--content-left); border-bottom: 1px solid rgba(27, 26, 24, 0.07); background: rgba(247, 241, 237, 0.96); backdrop-filter: blur(10px); font-size: 15px; font-weight: 620; }
.site-header a { text-decoration: none; }
.name { justify-self: start; font-size: 17px; font-weight: 720; }
.site-header nav { display: flex; gap: 34px; color: var(--ink-tertiary); }
.site-header nav .active { color: var(--ink-primary); }
.contact { justify-self: end; padding-bottom: 4px; border-bottom: 1px solid currentColor; }

.ability-stage { position: relative; z-index: 4; width: min(790px, 62vw); margin-left: var(--content-left); padding: calc(var(--header-height) + 42px) 0 11vh; }
.stage-intro { width: min(860px, calc(100vw - var(--content-left) - 24px)); padding: 3vh 0 clamp(50px, 6.4vh, 66px); scroll-margin-top: calc(var(--header-height) + 24px); }
.eyebrow { margin: 0 0 18px; color: var(--accent); font-size: 15px; font-weight: 680; letter-spacing: 0.03em; }
.stage-intro h1 { margin: 0; width: 100%; max-width: none; font-size: clamp(42px, 3.55vw, 50px); font-weight: 740; line-height: 1.08; letter-spacing: -0.045em; }
.intro-copy { margin: 20px 0 0; width: min(100%, 720px); color: var(--ink-secondary); font-size: 16px; line-height: 1.72; }

#ability-groups { position: relative; isolation: isolate; width: 100%; padding: 18px 0 0; overflow-anchor: none; }
#ability-groups::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: 0;
  width: calc(100% + 28px);
  border-radius: 16px 20px 20px 16px;
  border-left: 1px solid var(--surface-reading-edge);
  background: linear-gradient(108deg, var(--surface-reading) 0%, rgba(255, 253, 251, 0.72) 62%, var(--surface-reading-tail) 82%, rgba(247, 241, 237, 0.08) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.86);
}
#ability-groups::after { content: none; }
.ability-family { position: relative; width: 100%; margin: 0 0 12px; }
.ability-family:last-child { margin-bottom: 0; }
.family-disclosure { width: 100%; }
.family-content-shell { display: grid; grid-template-rows: 1fr; opacity: 1; transition: grid-template-rows 260ms cubic-bezier(0.22, 1, 0.36, 1), opacity 160ms ease; }
.family-disclosure[data-expanded="false"] .family-content-shell { grid-template-rows: 0fr; opacity: 0; }
.sticky-sentinel { position: absolute; top: 0; left: 0; width: 1px; height: 1px; pointer-events: none; }
.family-heading { position: sticky; z-index: 6; top: var(--header-height); display: grid; grid-template-columns: var(--number-column) minmax(0, 1fr); column-gap: var(--column-gap); align-items: center; width: 100%; min-height: 54px; margin: 0; padding: 0; border: 0; background: transparent; box-shadow: none; color: var(--ink-orientation); cursor: pointer; text-align: left; font: inherit; font-size: 17px; font-weight: 650; line-height: 1.3; letter-spacing: -0.01em; transition: box-shadow 180ms ease, background-color 180ms ease; }
.family-heading:focus-visible { outline: 2px solid rgba(115, 87, 123, 0.66); outline-offset: 3px; border-radius: 10px; }
.family-heading.is-stuck { background: linear-gradient(90deg, var(--surface-sticky) 0%, rgba(255, 253, 251, 0.9) 72%, rgba(255, 253, 251, 0.38) 92%, transparent 100%); box-shadow: 0 7px 14px rgba(61, 45, 39, 0.045); backdrop-filter: blur(10px) saturate(106%); }
.family-toggle { grid-column: 1; display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; margin-left: 10px; border-radius: 50%; color: rgba(115, 87, 123, 0.72); transform: rotate(90deg); transform-origin: center; transition: color 180ms ease, background-color 180ms ease, transform 220ms cubic-bezier(0.22, 1, 0.36, 1); }
.family-toggle svg { display: block; width: 12px; height: 12px; overflow: visible; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.family-disclosure[data-expanded="false"] .family-toggle { transform: rotate(0deg); }
.family-heading:hover .family-toggle, .family-heading:focus-visible .family-toggle { background: var(--accent-soft); color: var(--accent); }
.family-heading-copy { grid-column: 2; display: flex; align-items: baseline; gap: 14px; min-width: 0; }
.family-heading-label { margin: 0; color: inherit; font: inherit; }
.family-count { color: var(--ink-tertiary); font-size: 13px; font-weight: 620; font-variant-numeric: tabular-nums; letter-spacing: 0; }
.family-content { min-height: 0; overflow: hidden; padding: 0; transform-origin: top; }

.ability-entry { position: relative; isolation: isolate; display: grid; grid-template-columns: var(--number-column) minmax(0, 1fr); column-gap: var(--column-gap); width: calc(100% + 20px); margin: 0 -10px 6px; padding: 24px 10px 28px; border-radius: 14px; scroll-margin-top: calc(var(--header-height) + 64px); transition: transform 180ms cubic-bezier(0.22, 1, 0.36, 1); }
.ability-family:last-child .ability-entry:last-child { margin-bottom: 0; padding-bottom: 12px; }
.ability-entry::after { content: ""; position: absolute; z-index: -1; inset: 8px 0 8px 10px; border-radius: 12px; background: rgba(255, 253, 251, 0.76); box-shadow: 0 13px 30px rgba(67, 50, 62, 0.075), inset 0 1px 0 rgba(255, 255, 255, 0.84); opacity: 0; transition: opacity 180ms ease, box-shadow 180ms ease; }
.ability-entry + .ability-entry::before { content: ""; position: absolute; top: -3px; left: calc(10px + var(--number-column) + var(--column-gap)); width: 54px; height: 1px; background: linear-gradient(90deg, rgba(115, 87, 123, 0.36), transparent); transition: opacity 180ms ease; }
.ability-entry:hover, .ability-entry:focus-within { transform: translateY(-2px); }
.ability-entry:hover::after, .ability-entry:focus-within::after { opacity: 1; }
.ability-entry:hover::before, .ability-entry:focus-within::before { opacity: 0; }
.ability-heading { display: contents; }
.ability-number { grid-column: 1; grid-row: 1 / span 2; align-self: start; display: flex; flex-direction: row; align-items: baseline; gap: 4px; min-height: 72px; padding: 1px 0 0 10px; border: 0; background: none; box-shadow: none; color: var(--ink-tertiary); font-variant-numeric: tabular-nums; white-space: nowrap; transition: color 180ms ease; }
.ability-number strong { color: var(--ink-orientation); font-size: 24px; font-weight: 580; line-height: 1; letter-spacing: -0.04em; }
.ability-number small { margin-top: 0; font-size: 12px; font-weight: 650; }
.ability-title { grid-column: 2; grid-row: 1; margin: -4px 0 0; width: 100%; color: var(--ink-primary); font-size: clamp(28px, 2.25vw, 32px); font-weight: 710; line-height: 1.16; letter-spacing: -0.035em; }
.ability-content { grid-column: 2; grid-row: 2; width: 100%; padding: 18px 0 0; }
.ability-judgment { position: relative; margin: 0; width: min(92%, 660px); padding: 12px 16px 13px; border-left: 2px solid rgba(115, 87, 123, 0.62); background: linear-gradient(90deg, rgba(115, 87, 123, 0.105), rgba(255, 255, 255, 0.28) 66%, rgba(255, 255, 255, 0.04) 100%); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.72); color: var(--ink-judgment); transform: none; font-size: clamp(18px, 1.45vw, 20px); font-weight: 580; line-height: 1.55; letter-spacing: -0.018em; }
.ability-entry:hover .ability-judgment, .ability-entry:focus-within .ability-judgment { border-left-color: var(--accent); }
.ability-body { margin: 16px 0 0; width: 100%; color: var(--ink-secondary); font-size: 16px; line-height: 1.74; }
.ability-body strong { color: var(--ink-primary); font-weight: 680; }
.case-footer { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 14px; width: 100%; margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--line); }
.case-label { color: var(--ink-tertiary); font-size: 14px; font-weight: 650; }
.case-links { display: grid; gap: 8px; }
.case-links a { display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 7px; width: fit-content; color: #4f4947; font-size: 14px; font-weight: 610; text-decoration-color: rgba(115, 87, 123, 0.42); }
.case-index { display: inline-flex; align-items: center; justify-content: center; width: 24px; min-height: 20px; background: var(--accent); box-shadow: 2px 3px 0 rgba(115, 87, 123, 0.15); color: #fffdfa; font-size: 11px; font-weight: 680; font-variant-numeric: tabular-nums; text-decoration: none; }
.case-links a:hover, .case-links a:focus-visible { color: var(--accent); }

.ability-family[data-family="ai"] .ability-number, .ability-family[data-family="ai"] .ability-title { color: var(--accent); }
.ability-family[data-family="ai"] .ability-entry::after { background: linear-gradient(90deg, rgba(115, 87, 123, 0.055), rgba(255, 253, 251, 0.36) 78%); opacity: 1; }

@media (prefers-reduced-motion: no-preference) {
  .ability-entry { opacity: 0.82; transform: translateY(12px); transition: opacity 420ms ease, transform 420ms cubic-bezier(0.22, 1, 0.36, 1), background-color 180ms ease, box-shadow 180ms ease; }
  .ability-entry.is-visible { opacity: 1; transform: none; }
  .ability-entry.is-visible:hover, .ability-entry.is-visible:focus-within { transform: translateY(-2px); }
}

@media (max-width: 1180px) and (min-width: 768px) {
  .ability-stage { width: min(720px, 64vw); }
  .portrait-video { right: -8vw; width: 78vw; }
  .portrait-blend { background: linear-gradient(90deg, var(--canvas-media) 0%, var(--canvas-media) 42%, rgba(247, 241, 237, 0.95) 51%, rgba(247, 241, 237, 0.46) 65%, rgba(247, 241, 237, 0) 80%); }
}

@media (max-width: 767px) {
  :root { --header-height: 60px; --content-left: 18px; --number-column: 54px; --column-gap: 8px; }
  html { scroll-behavior: auto; }
  .site-header { grid-template-columns: 1fr auto; font-size: 15px; }
  .site-header nav { display: none; }
  .portrait-layer { position: relative; z-index: 1; height: auto; aspect-ratio: 16 / 9; margin-top: var(--header-height); }
  .portrait-video { top: 0; right: 0; width: 100%; height: 100%; object-fit: contain; object-position: center; transform: none; -webkit-mask-image: none; mask-image: none; }
  .portrait-blend { background: linear-gradient(180deg, transparent 72%, var(--canvas-media) 100%); }
  .ability-stage { z-index: 4; width: auto; margin: 0; padding: 12px 18px 72px; }
  .stage-intro { width: auto; padding: 26px 10px 62px; }
  .eyebrow { margin-bottom: 16px; font-size: 14px; }
  .stage-intro h1 { max-width: 9.5em; font-size: clamp(38px, 10.8vw, 48px); }
  .intro-copy { font-size: 16px; }
  #ability-groups { padding: 12px 10px 0; }
  #ability-groups::before { left: 0; width: 100%; border-radius: 14px; background: rgba(255, 253, 251, 0.68); }
  .ability-family { width: 100%; margin: 0 0 12px; }
  .family-heading { display: flex; width: 100%; min-height: 52px; margin: 0; padding: 0; font-size: 17px; }
  .family-toggle { order: 2; flex: 0 0 auto; width: 24px; height: 24px; margin: 0 0 0 10px; }
  .family-heading-copy { order: 1; flex: 1 1 auto; gap: 10px; }
  .family-count { font-size: 13px; }
  .family-content { padding-bottom: 18px; }
  .ability-entry { grid-template-columns: minmax(0, 1fr); width: 100%; margin: 0 0 4px; padding: 22px 0 26px; border-radius: 12px; }
  .ability-entry::after { inset: 6px 0; }
  .ability-entry:hover, .ability-entry:focus-within { transform: none; }
  .ability-number { grid-column: 1; grid-row: 1; min-height: 0; margin-bottom: 12px; padding-left: 0; }
  .ability-number strong { font-size: 22px; }
  .ability-number small { font-size: 11px; }
  .ability-title { grid-column: 1; grid-row: 2; font-size: 26px; }
  .ability-content { grid-column: 1; grid-row: 3; padding-top: 18px; }
  .ability-judgment { width: 100%; padding: 12px 13px; font-size: 18px; }
  .ability-body { font-size: 16px; line-height: 1.72; }
  .case-footer { grid-template-columns: 1fr; gap: 9px; margin-top: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .family-content-shell { transition: none; }
  .family-toggle { transition: none; }
  .ability-entry { opacity: 1; transform: none; transition: none; }
  .ability-entry:hover, .ability-entry:focus-within { transform: none; }
}

@media print {
  .site-header, .portrait-layer { display: none; }
  .ability-stage { width: auto; margin: 0; padding: 0; }
  .stage-intro { width: auto; padding: 0 0 48px; }
  .family-heading { position: static; }
  .family-content-shell { grid-template-rows: 1fr !important; opacity: 1 !important; }
  .ability-entry { break-inside: avoid; opacity: 1; transform: none; }
}