/* ==========================================================================
   安博赛事 · 共享样式表  /assets/site.css
   ========================================================================== */

/* 1. Reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
img, svg, picture { display: block; max-width: 100%; }
table { border-collapse: collapse; border-spacing: 0; }

/* 2. Tokens --------------------------------------------------------------- */
:root {
  --ab-red: #E01F2D;
  --ab-red-deep: #C4141F;
  --ab-blue: #1257D6;
  --ab-blue-deep: #0D45AC;
  --ab-indigo: #0B1230;
  --ab-green: #0C3629;
  --ab-amber: #F0A63C;
  --ab-amber-deep: #D9911F;
  --ab-paper: #F7F4ED;
  --ab-line: #C9D4E6;
  --ab-wine: #7A1730;
  --ab-violet: #3A2A6E;
  --ab-ink: #0E1015;

  --ab-ink-70: rgba(14, 16, 21, .70);
  --ab-ink-50: rgba(14, 16, 21, .50);
  --ab-paper-85: rgba(247, 244, 237, .85);
  --ab-paper-65: rgba(247, 244, 237, .65);
  --ab-paper-42: rgba(247, 244, 237, .42);
  --ab-paper-18: rgba(247, 244, 237, .18);

  --ab-font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --ab-font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ab-wrap-max: 1320px;
  --ab-gutter: 20px;
  --ab-gap: 24px;
  --ab-dur: 180ms;
  --ab-ease: cubic-bezier(.2, .7, .3, 1);
  --ab-hair: 1px;
}
@media (min-width: 768px) { :root { --ab-gutter: 32px; } }
@media (min-width: 1200px) { :root { --ab-gutter: 40px; } }

/* 3. Base typography ------------------------------------------------------ */
body {
  min-height: 100vh;
  background-color: var(--ab-paper);
  color: var(--ab-ink);
  font-family: var(--ab-font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
}
h1, h2, h3, h4, h5 {
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.15;
  text-wrap: balance;
}
h1 { font-size: clamp(38px, 6vw, 76px); }
h2 { font-size: clamp(28px, 3.6vw, 54px); }
h3 { font-size: clamp(22px, 2.4vw, 38px); }
h4 { font-size: clamp(19px, 1.9vw, 28px); letter-spacing: -.01em; }
h5 { font-size: 17px; letter-spacing: 0; }
p { max-width: 78ch; }
strong { font-weight: 700; }

:focus-visible {
  outline: 2px solid var(--ab-amber);
  outline-offset: 2px;
  border-radius: 1px;
}

/* 4. Layout primitives ---------------------------------------------------- */
.ab-wrap {
  width: 100%;
  max-width: var(--ab-wrap-max);
  margin-inline: auto;
  padding-inline: var(--ab-gutter);
}
.ab-section { padding-block: clamp(56px, 7vw, 104px); }
.ab-section--tight { padding-block: clamp(32px, 4vw, 56px); }

.ab-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--ab-gap);
}
.ab-col-12 { grid-column: span 12; }
.ab-col-8 { grid-column: span 8; }
.ab-col-6 { grid-column: span 6; }
.ab-col-4 { grid-column: span 4; }
.ab-col-3 { grid-column: span 3; }
@media (max-width: 1023px) {
  .ab-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .ab-col-8 { grid-column: span 6; }
  .ab-col-4 { grid-column: span 3; }
  .ab-col-3 { grid-column: span 3; }
}
@media (max-width: 639px) {
  .ab-grid { grid-template-columns: minmax(0, 1fr); }
  .ab-col-12, .ab-col-8, .ab-col-6, .ab-col-4, .ab-col-3 { grid-column: span 1; }
}

.ab-prose { max-width: 72ch; }
.ab-prose > * + * { margin-top: 1.05em; }
.ab-prose h2 { margin-top: 1.9em; }
.ab-prose h3 { margin-top: 1.5em; }
.ab-prose ul, .ab-prose ol { display: grid; gap: .45em; padding-left: 1.15em; }
.ab-prose ul { list-style: disc; }
.ab-prose ol { list-style: decimal; }
.ab-prose a {
  color: var(--ab-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.ab-prose a:hover { color: var(--ab-red); }

/* 5. Skip link ------------------------------------------------------------ */
.ab-skip {
  position: fixed;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--ab-amber);
  color: var(--ab-ink);
  font-size: 14px;
  font-weight: 700;
  border-radius: 2px;
  transition: top var(--ab-dur) var(--ab-ease);
}
.ab-skip:focus { top: 12px; }

/* 6. Header --------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ab-paper);
  border-bottom: var(--ab-hair) solid var(--ab-line);
  transition: box-shadow var(--ab-dur) var(--ab-ease);
}
.site-header[data-scrolled="true"] {
  box-shadow: 0 14px 28px -24px rgba(11, 18, 48, .75);
}

/* 6.1 品牌说明带 */
.ab-strip {
  background: var(--ab-indigo);
  color: var(--ab-paper);
}
.ab-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  min-height: 42px;
  padding-block: 7px;
}
.ab-strip__id {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
  max-width: 100%;
}
.ab-strip__name {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .06em;
  color: var(--ab-paper);
  flex: 0 0 auto;
}
.ab-strip__divider {
  width: 1px;
  height: 12px;
  background: var(--ab-paper-42);
  flex: 0 0 auto;
  align-self: center;
}
.ab-strip__line {
  font-size: 12.5px;
  color: var(--ab-paper-65);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ab-strip__meta { display: none; }
.ab-strip__mail {
  font-family: var(--ab-font-mono);
  font-size: 12.5px;
  color: var(--ab-paper-85);
  border-bottom: 1px solid var(--ab-paper-18);
  padding-bottom: 1px;
  transition: color var(--ab-dur) var(--ab-ease), border-color var(--ab-dur) var(--ab-ease);
}
.ab-strip__mail:hover { color: var(--ab-amber); border-bottom-color: var(--ab-amber); }
.ab-strip__toggle {
  margin-left: auto;
  padding: 6px 11px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ab-amber);
  border: var(--ab-hair) solid rgba(240, 166, 60, .55);
  border-radius: 2px;
  transition: background-color var(--ab-dur) var(--ab-ease), color var(--ab-dur) var(--ab-ease);
}
.ab-strip__toggle:hover { background: rgba(240, 166, 60, .12); }

@media (max-width: 899px) {
  .ab-strip[data-open] .ab-strip__meta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    flex-basis: 100%;
    margin-left: 0;
    padding-bottom: 8px;
  }
}
@media (min-width: 900px) {
  .ab-strip__meta {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-left: auto;
  }
  .ab-strip__toggle { display: none; }
}

/* 6.2 标签与状态灯 */
.ab-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .1em;
  border: var(--ab-hair) solid;
  border-radius: 2px;
  white-space: nowrap;
}
.ab-tag--amber { border-color: var(--ab-amber); color: var(--ab-amber); }
.ab-tag--ghost { border-color: var(--ab-paper-18); color: var(--ab-paper-65); }
.ab-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ab-amber);
  flex: 0 0 auto;
  animation: ab-pulse 2.4s var(--ab-ease) infinite;
}
@keyframes ab-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(240, 166, 60, .55); }
  70%  { box-shadow: 0 0 0 7px rgba(240, 166, 60, 0); }
  100% { box-shadow: 0 0 0 0 rgba(240, 166, 60, 0); }
}

/* 6.3 主导航条 */
.ab-nav { position: relative; background: var(--ab-paper); }
.ab-nav__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
}
.ab-burger {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ab-indigo);
  border: var(--ab-hair) solid var(--ab-line);
  border-radius: 2px;
  transition: border-color var(--ab-dur) var(--ab-ease), background-color var(--ab-dur) var(--ab-ease);
}
.ab-burger:hover { border-color: var(--ab-ink); background: rgba(14, 16, 21, .03); }
.ab-burger__bars { display: grid; gap: 3px; width: 16px; }
.ab-burger__bars i { display: block; height: 2px; width: 100%; background: var(--ab-red); }
.ab-burger__bars i:nth-child(2) { background: var(--ab-ink); width: 78%; }
.ab-burger__bars i:nth-child(3) { background: var(--ab-blue); }
.ab-burger__text { white-space: nowrap; }

.ab-nav__list {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 88;
  max-height: 0;
  visibility: hidden;
  overflow: hidden;
  background: var(--ab-paper);
  border-top: var(--ab-hair) solid var(--ab-line);
  border-bottom: var(--ab-hair) solid var(--ab-line);
  box-shadow: 0 22px 34px -28px rgba(11, 18, 48, .8);
  transition: max-height var(--ab-dur) var(--ab-ease);
}
.ab-nav__list[data-open] { max-height: 560px; visibility: visible; }
.ab-nav__items { display: grid; padding: 6px var(--ab-gutter) 16px; }
.ab-nav__items a {
  display: block;
  padding: 13px 2px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ab-indigo);
  border-bottom: var(--ab-hair) solid var(--ab-line);
  transition: color var(--ab-dur) var(--ab-ease), padding-left var(--ab-dur) var(--ab-ease);
}
.ab-nav__items a:hover { color: var(--ab-red); padding-left: 8px; }
.ab-nav__items a[aria-current="page"] {
  color: var(--ab-ink);
  font-weight: 700;
  background: rgba(224, 31, 45, .07);
  border-bottom-color: var(--ab-red);
  padding-inline: 10px;
}

@media (min-width: 1000px) {
  .ab-burger { display: none; }
  .ab-nav__list {
    position: static;
    flex: 1 1 auto;
    max-height: none;
    visibility: visible;
    overflow: visible;
    background: transparent;
    border: 0;
    box-shadow: none;
  }
  .ab-nav__items { display: flex; align-items: center; gap: 4px; padding: 0; }
  .ab-nav__items a {
    position: relative;
    display: inline-block;
    padding: 10px 11px;
    font-size: 14.5px;
    border-bottom: 0;
    white-space: nowrap;
  }
  .ab-nav__items a:hover { color: var(--ab-ink); padding-left: 11px; }
  .ab-nav__items a::after {
    content: "";
    position: absolute;
    left: 11px;
    right: 11px;
    bottom: 3px;
    height: 2px;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform var(--ab-dur) var(--ab-ease);
  }
  .ab-nav__items li:nth-child(odd) a::after { background: var(--ab-red); }
  .ab-nav__items li:nth-child(even) a::after { background: var(--ab-blue); }
  .ab-nav__items a:hover::after { transform: scaleX(1); }
  .ab-nav__items a[aria-current="page"] {
    color: var(--ab-ink);
    font-weight: 700;
    background: transparent;
    padding-inline: 11px;
  }
  .ab-nav__items a[aria-current="page"]::after { transform: scaleX(1); }
}

.ab-nav__tools {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}
.ab-lights { display: none; gap: 7px; align-items: center; }
@media (min-width: 700px) { .ab-lights { display: inline-flex; } }
.ab-light {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: block;
}
.ab-light--red { background: var(--ab-red); box-shadow: 0 0 0 3px rgba(224, 31, 45, .14); }
.ab-light--blue { background: var(--ab-blue); box-shadow: 0 0 0 3px rgba(18, 87, 214, .14); }

.ab-search {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px 8px 11px;
  font-size: 12.5px;
  color: var(--ab-ink-70);
  border: var(--ab-hair) solid var(--ab-line);
  border-radius: 2px;
  background-image: linear-gradient(90deg, rgba(18, 87, 214, .07), rgba(224, 31, 45, .07));
  white-space: nowrap;
  transition: border-color var(--ab-dur) var(--ab-ease), color var(--ab-dur) var(--ab-ease);
}
.ab-search:hover { border-color: var(--ab-blue); color: var(--ab-blue); }
.ab-search__icon {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
}
.ab-search__icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 6px;
  height: 1.5px;
  background: currentColor;
  transform: rotate(45deg);
}
@media (max-width: 560px) { .ab-search__text { display: none; } .ab-search { padding: 9px 10px; } }

.ab-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  pointer-events: none;
  background: transparent;
}
.ab-progress > [data-progress] {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--ab-blue) 0%, var(--ab-violet) 45%, var(--ab-red) 100%);
}

/* 7. Footer --------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  background: var(--ab-indigo);
  color: var(--ab-paper);
}
.site-footer::before,
.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  height: 2px;
  width: 50%;
}
.site-footer::before { left: 0; background: var(--ab-red); }
.site-footer::after { left: 50%; background: var(--ab-blue); }

.ab-foot__top {
  display: grid;
  gap: 40px;
  padding: 56px 0 40px;
}
@media (min-width: 1000px) {
  .ab-foot__top {
    grid-template-columns: minmax(220px, 4fr) 8fr;
    gap: 56px;
    padding: 80px 0 56px;
  }
}
.ab-foot__name {
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ab-paper);
}
.ab-foot__name::after {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--ab-red) 0 50%, var(--ab-blue) 50% 100%);
}
.ab-foot__line {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ab-paper-65);
}
.ab-foot__grid {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 620px) { .ab-foot__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1000px) { .ab-foot__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; } }

.ab-foot__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--ab-amber);
  border-bottom: var(--ab-hair) solid var(--ab-paper-18);
}
.ab-foot__col ul { display: grid; }
.ab-foot__col li + li { margin-top: 2px; }
.ab-foot__col a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14.5px;
  color: var(--ab-paper-85);
  transition: color var(--ab-dur) var(--ab-ease), transform var(--ab-dur) var(--ab-ease);
}
.ab-foot__col a:hover { color: var(--ab-amber); transform: translateX(2px); }
.ab-foot__num {
  display: inline-block;
  padding: 4px 0;
  font-family: var(--ab-font-mono);
  font-size: 14.5px;
  color: var(--ab-paper);
  letter-spacing: .02em;
}
.ab-foot__plain {
  display: inline-block;
  padding: 4px 0;
  font-size: 14.5px;
  color: var(--ab-paper-85);
}
.ab-foot__note {
  margin-top: 14px;
  max-width: 32ch;
  font-size: 12.5px;
  font-style: italic;
  line-height: 1.7;
  color: var(--ab-paper-65);
}

.ab-foot__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding: 20px 0 34px;
  border-top: var(--ab-hair) solid var(--ab-paper-18);
}
.ab-foot__caliber {
  max-width: 46ch;
  font-size: 12.5px;
  font-style: italic;
  color: var(--ab-paper-65);
}
.ab-foot__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-family: var(--ab-font-mono);
  font-size: 12.5px;
  color: var(--ab-paper-65);
}
.ab-foot__legal span { white-space: nowrap; }

/* 8. Shared components ---------------------------------------------------- */
.ab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.2;
  border: var(--ab-hair) solid transparent;
  border-radius: 2px;
  transition: background-color var(--ab-dur) var(--ab-ease),
              color var(--ab-dur) var(--ab-ease),
              border-color var(--ab-dur) var(--ab-ease),
              transform var(--ab-dur) var(--ab-ease);
}
.ab-btn--red { background: var(--ab-red); color: #fff; }
.ab-btn--red:hover { background: var(--ab-red-deep); transform: translateY(-2px); }
.ab-btn--blue { background: var(--ab-blue); color: #fff; }
.ab-btn--blue:hover { background: var(--ab-blue-deep); transform: translateY(-2px); }
.ab-btn--amber { background: var(--ab-amber); color: var(--ab-ink); }
.ab-btn--amber:hover { background: var(--ab-amber-deep); transform: translateY(-2px); }
.ab-btn--ghost {
  background: transparent;
  border-color: var(--ab-line);
  color: var(--ab-indigo);
}
.ab-btn--ghost:hover { border-color: var(--ab-ink); transform: translateY(-2px); }

.ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-size: 12.5px;
  color: var(--ab-ink-50);
}
.ab-crumb a { color: var(--ab-blue); }
.ab-crumb a:hover { text-decoration: underline; text-underline-offset: 3px; }
.ab-crumb__sep { color: var(--ab-line); }
.ab-crumb [aria-current="page"] { color: var(--ab-ink); font-weight: 600; }

.ab-head { display: grid; gap: 10px; margin-bottom: 32px; }
.ab-head__index {
  font-family: var(--ab-font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ab-red);
}
.ab-head__title { color: var(--ab-ink); }
.ab-head__desc { max-width: 62ch; font-size: 16px; color: var(--ab-ink-70); }

.ab-panel {
  position: relative;
  padding: 24px;
  background: #fff;
  border: var(--ab-hair) solid var(--ab-line);
  border-left: 3px solid var(--ab-line);
  transition: transform var(--ab-dur) var(--ab-ease),
              border-color var(--ab-dur) var(--ab-ease),
              box-shadow var(--ab-dur) var(--ab-ease);
}
.ab-panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px -26px rgba(11, 18, 48, .8);
}
.ab-panel--red { border-left-color: var(--ab-red); }
.ab-panel--blue { border-left-color: var(--ab-blue); }
.ab-panel--amber { border-left-color: var(--ab-amber); }
.ab-panel--violet { border-left-color: var(--ab-violet); }
.ab-panel--wine { border-left-color: var(--ab-wine); }
.ab-panel:hover.ab-panel--red { border-color: var(--ab-red); }
.ab-panel:hover.ab-panel--blue { border-color: var(--ab-blue); }

.ab-media {
  position: relative;
  overflow: hidden;
  border: var(--ab-hair) solid var(--ab-line);
  background-color: var(--ab-indigo);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(247, 244, 237, .06) 0 8px,
    transparent 8px 16px
  );
}
.ab-media img { width: 100%; height: 100%; object-fit: cover; }
.ab-media--16x9 { aspect-ratio: 16 / 9; }
.ab-media--4x3 { aspect-ratio: 4 / 3; }
.ab-media--1x1 { aspect-ratio: 1 / 1; }
.ab-media--portrait { aspect-ratio: 3 / 4; }
.ab-media--shade::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 52%, rgba(11, 18, 48, .68));
  pointer-events: none;
}
.ab-media__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 11px;
  font-family: var(--ab-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ab-paper);
  background: var(--ab-indigo);
}

.ab-note {
  max-width: 60ch;
  font-size: 14px;
  font-style: italic;
  line-height: 1.65;
  color: var(--ab-ink-50);
}
.ab-note--vertical {
  writing-mode: vertical-rl;
  max-width: none;
  font-style: normal;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ab-wine);
}

.ab-table-wrap {
  overflow-x: auto;
  background: #fff;
  border: var(--ab-hair) solid var(--ab-line);
}
.ab-table { width: 100%; min-width: 640px; font-size: 14px; }
.ab-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 12px 14px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .12em;
  text-align: left;
  white-space: nowrap;
  color: var(--ab-paper);
  background: var(--ab-indigo);
}
.ab-table tbody td {
  padding: 11px 14px;
  vertical-align: top;
  border-top: var(--ab-hair) solid var(--ab-line);
}
.ab-table tbody tr { transition: background-color var(--ab-dur) var(--ab-ease); }
.ab-table tbody tr:hover { background: rgba(18, 87, 214, .05); }
.ab-table tbody td:first-child {
  box-shadow: inset 3px 0 0 0 transparent;
  transition: box-shadow var(--ab-dur) var(--ab-ease);
}
.ab-table tbody tr:hover td:first-child { box-shadow: inset 3px 0 0 0 var(--ab-red); }
.ab-num {
  font-family: var(--ab-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.ab-timeline { position: relative; padding-left: 28px; }
.ab-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: var(--ab-hair);
  background: var(--ab-line);
}
.ab-timeline__item { position: relative; padding-bottom: 28px; }
.ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ab-paper);
  border: 2px solid var(--ab-violet);
  transition: transform var(--ab-dur) var(--ab-ease), background-color var(--ab-dur) var(--ab-ease);
}
.ab-timeline__item:hover::before { transform: scale(1.15); background: var(--ab-violet); }

.ab-tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  border-bottom: var(--ab-hair) solid var(--ab-line);
}
.ab-tab {
  padding: 10px 16px;
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--ab-ink-70);
  border-bottom: 2px solid transparent;
  transition: color var(--ab-dur) var(--ab-ease), border-color var(--ab-dur) var(--ab-ease);
}
.ab-tab:hover { color: var(--ab-ink); }
.ab-tab[aria-selected="true"] { color: var(--ab-ink); border-bottom-color: var(--ab-red); }
.ab-tabpanel[hidden] { display: none; }

.ab-faq { border-top: var(--ab-hair) solid var(--ab-line); }
.ab-faq__item { border-bottom: var(--ab-hair) solid var(--ab-line); }
.ab-faq__btn {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 0;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  transition: color var(--ab-dur) var(--ab-ease);
}
.ab-faq__btn:hover { color: var(--ab-blue); }
.ab-faq__body {
  max-width: 70ch;
  padding-bottom: 18px;
  font-size: 15px;
  color: var(--ab-ink-70);
}

/* 9. Motion safety -------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}