/* ========== 1. Reset & Tokens ========== */
:root {
  --c-primary: #0B1D3A;
  --c-accent: #FF6B1A;
  --c-silver: #C0C0C0;
  --c-light: #F5F7FA;
  --c-dark: #081429;
  --c-text: #1A1A1A;
  --c-text-2: #5A6472;
  --c-border: #D1D5DB;
  --c-gold: #FFD700;
  --c-white: #FFFFFF;
  --font-head: 'Impact', 'Arial Black', 'Microsoft YaHei', sans-serif;
  --font-body: 'Roboto', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --container-w: 1240px;
  --header-h: 72px;
  --shadow-card: 0 12px 32px rgba(8, 20, 41, 0.14);
  --ease: 180ms cubic-bezier(0.4, 0, 0.2, 1);
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration-thickness: 2px; text-underline-offset: 4px; }
a:hover { color: var(--c-accent); }
ul, ol { list-style: none; margin: 0; padding: 0; }
p { margin: 0 0 1em; }
address { font-style: normal; }
[hidden] { display: none !important; }
::selection { background: var(--c-accent); color: var(--c-white); }

/* ========== 2. Typography ========== */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.12;
  color: var(--c-primary);
  margin: 0 0 0.6em;
  text-wrap: balance;
}
h1 { font-size: 48px; }
h2 { font-size: 32px; }
h3 { font-size: 24px; }
h4 { font-size: 18px; }
.section--dark h1, .section--dark h2, .section--dark h3,
.section--tint h1, .section--tint h2, .section--tint h3,
.page-hero h1 { color: var(--c-white); }

/* ========== 3. Layout Primitives ========== */
.container { width: min(100% - 40px, var(--container-w)); margin-inline: auto; }
@media (min-width: 1200px) {
  .container { width: min(100% - 80px, var(--container-w)); }
}
.section { padding-block: clamp(3rem, 7vw, 6rem); }
.section--dark { background: var(--c-dark); color: #dfe6f0; }
.section--tint { background: var(--c-primary); color: #dfe6f0; }
.section--paper { background: var(--c-light); }
.grid { display: grid; gap: 24px; }
.grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
.grid--gap-lg { gap: 36px; }
@media (min-width: 680px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ========== 4. Buttons, Tags, Links ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 22px;
  border: 1px solid var(--c-border);
  background: transparent;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
}
.btn:hover { color: var(--c-accent); border-color: var(--c-accent); }
.btn--primary {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-white);
  box-shadow: 0 4px 16px rgba(255, 107, 26, 0.35);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}
.btn--primary:hover {
  background: #ff7f3a;
  border-color: #ff7f3a;
  color: var(--c-white);
  transform: translateY(-2px);
}
.btn--primary:focus-visible {
  clip-path: none;
  outline: 3px solid var(--c-gold);
  outline-offset: 2px;
}
.btn--ghost {
  border-color: rgba(192, 192, 192, 0.55);
  color: var(--c-silver);
  background: rgba(192, 192, 192, 0.05);
}
.btn--ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(255, 107, 26, 0.08);
}
.btn--small { min-height: 32px; padding: 5px 14px; font-size: 12px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
  background: transparent;
  white-space: nowrap;
}
.tag::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--c-silver);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}
.tag--accent { border-color: var(--c-accent); color: var(--c-accent); }
.tag--accent::before { background: var(--c-accent); }
.tag--gold { border-color: var(--c-gold); color: #8a6d00; }
.tag--gold::before { background: var(--c-gold); }
.tag--outline { border-color: var(--c-border); color: var(--c-text-2); background: transparent; }
.tag--outline::before { background: var(--c-silver); }
.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
  text-decoration: none;
}
.link-more::after { content: "→"; transition: transform var(--ease); }
.link-more:hover { color: var(--c-accent); }
.link-more:hover::after { transform: translateX(3px); }

/* ========== 5. Header ========== */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--c-accent);
  color: var(--c-white);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 200ms ease;
}
.skip-link:focus-visible { transform: translateY(0); }
.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 250;
  pointer-events: none;
}
.site-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-gold) 70%, var(--c-silver) 100%);
  transform: scaleX(0);
  transform-origin: left center;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--c-primary);
  color: #dfe6f0;
  border-bottom: 1px solid rgba(192, 192, 192, 0.22);
}
.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent) 0%, transparent 68%);
}
.site-header__inner {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: var(--header-h);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-white);
  text-decoration: none;
}
.brand:hover { color: var(--c-white); }
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--c-accent);
  color: var(--c-white);
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  clip-path: polygon(0 0, 74% 0, 100% 26%, 100% 100%, 0 100%);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25);
}
.brand__name {
  display: block;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.1;
}
.brand__meta {
  display: block;
  margin-top: 2px;
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--c-silver);
  text-transform: uppercase;
  white-space: nowrap;
}
.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
}
.site-nav__list { display: flex; align-items: center; gap: 2px; }
.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  color: #dfe6f0;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--ease), background-color var(--ease), border-color var(--ease);
}
.site-nav__index { font-size: 10px; font-weight: 700; color: var(--c-silver); letter-spacing: 0.08em; }
.site-nav__link:hover { color: var(--c-white); background: rgba(255, 255, 255, 0.06); }
.site-nav__link:focus-visible { outline: 2px solid var(--c-accent); outline-offset: -2px; }
.site-nav__link[aria-current="page"] {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--c-accent); }
.site-nav__cta { margin-left: 20px; flex-shrink: 0; }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(192, 192, 192, 0.4);
  color: #dfe6f0;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible { border-color: var(--c-accent); color: var(--c-white); }
.nav-toggle__box { display: inline-grid; gap: 5px; width: 18px; }
.nav-toggle__line { display: block; height: 2px; background: currentColor; transition: transform 200ms ease; transform-origin: center; }
.nav-toggle[aria-expanded="true"] .nav-toggle__line:first-child { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__line:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* ========== 6. Mobile Nav ========== */
@media (max-width: 1100px) {
  .site-header__inner { grid-template-columns: 1fr auto; min-height: 64px; gap: 12px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    background: var(--c-dark);
    border-top: 1px solid rgba(192, 192, 192, 0.18);
    border-bottom: 2px solid var(--c-accent);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.35);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 300ms ease, visibility 300ms ease;
  }
  .site-nav[data-open] { max-height: 560px; visibility: visible; }
  .site-nav__list { flex-direction: column; align-items: stretch; padding: 10px 16px 4px; gap: 0; }
  .site-nav__link {
    padding: 13px 10px;
    border-bottom: 1px solid rgba(192, 192, 192, 0.14);
    border-left: 3px solid transparent;
    border-radius: 0;
  }
  .site-nav__link[aria-current="page"] {
    border-left-color: var(--c-accent);
    border-bottom-color: rgba(192, 192, 192, 0.14);
    color: var(--c-accent);
  }
  .site-nav__cta { margin: 14px 16px 18px; justify-content: center; }
}

/* ========== 7. Footer ========== */
.site-footer {
  background: var(--c-dark);
  color: #b9c2d1;
  font-size: 14px;
}
.site-footer a { color: #c9d2e0; text-decoration: none; transition: color var(--ease); }
.site-footer a:hover { color: var(--c-accent); }
.site-footer__main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: 48px 0 36px;
}
.brand--footer .brand__name { color: var(--c-white); font-size: 26px; }
.brand--footer .brand__meta { color: var(--c-silver); }
.site-footer__trust {
  max-width: 380px;
  margin: 16px 0 20px;
  font-size: 13px;
  line-height: 1.7;
  color: #9aa5b5;
}
.site-footer__head {
  position: relative;
  margin: 0 0 14px;
  padding-left: 14px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-white);
  text-transform: uppercase;
}
.site-footer__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 5px;
  background: var(--c-accent);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%, 40% 50%);
}
.site-footer__list { display: grid; gap: 10px; }
.site-footer__list a { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; }
.site-footer__list a::before { content: "→"; color: var(--c-accent); font-size: 12px; opacity: 0.7; }
.site-footer__contact {
  display: grid;
  gap: 8px;
  margin-top: 18px;
  font-size: 13px;
  color: #9aa5b5;
}
.site-footer__version {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 24px;
  margin-bottom: 28px;
  background: rgba(192, 192, 192, 0.05);
  border: 1px solid rgba(192, 192, 192, 0.2);
  border-left: 4px solid var(--c-accent);
}
.footer-version__item { display: grid; gap: 4px; align-content: start; }
.footer-version__name { color: var(--c-white); font-size: 15px; }
.footer-version__meta { color: #9aa5b5; font-size: 12px; }
.footer-version__note {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid rgba(192, 192, 192, 0.16);
  font-size: 12px;
  color: #8b94a5;
}
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 22px 0 28px;
  border-top: 1px solid rgba(192, 192, 192, 0.16);
  color: #8b94a5;
  font-size: 13px;
}
.site-footer__legal-line { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; }
.site-footer__sep { color: var(--c-accent); }
.site-footer__service { margin: 0; }
@media (min-width: 720px) {
  .site-footer__main { grid-template-columns: 1.2fr 0.8fr 1fr; gap: 48px; }
  .site-footer__version { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
}

/* ========== 8. Content Components ========== */
.section-head {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: clamp(28px, 4vw, 44px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-border);
}
.section-head__text { flex: 1; }
.section-head__eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-text-2);
}
.section-head__eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--c-accent); }
.chapter { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; }
.chapter__num {
  font-family: var(--font-head);
  font-size: clamp(3rem, 6vw, 4.5rem);
  line-height: 0.9;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-accent);
  opacity: 0.25;
}
@supports (-webkit-text-stroke: 1px rgba(255, 107, 26, 0.65)) {
  .chapter__num {
    color: transparent;
    opacity: 1;
    -webkit-text-stroke: 2px rgba(255, 107, 26, 0.65);
  }
}
.chapter__title {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 800;
  color: var(--c-primary);
  margin: 0;
}
.chapter__sign {
  margin-left: auto;
  padding: 4px 10px;
  border: 1px solid var(--c-border);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-2);
  white-space: nowrap;
}
.chapter--on-dark .chapter__num {
  color: rgba(255, 255, 255, 0.2);
  -webkit-text-stroke-color: rgba(255, 255, 255, 0.5);
}
.chapter--on-dark .chapter__title { color: var(--c-white); }
.chapter--on-dark .chapter__sign { color: var(--c-silver); border-color: rgba(192, 192, 192, 0.4); }
.board {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px;
  background: var(--c-light);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-card);
}
.board::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 44px;
  height: 4px;
  background: var(--c-accent);
  clip-path: polygon(0 0, 100% 0, 72% 100%, 0 100%);
}
.board__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
}
.board__title { margin: 0; font-family: var(--font-head); font-size: 18px; color: var(--c-primary); }
.board__summary { margin: 0; font-size: 14px; line-height: 1.7; color: var(--c-text-2); }
.board__evidence {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 12px 16px;
  background: rgba(192, 192, 192, 0.16);
  border-left: 3px solid var(--c-accent);
  font-size: 14px;
  color: var(--c-text);
}
.board__terms { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.board__links { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 12px; border-top: 1px solid var(--c-border); }
.board--inverted {
  background: var(--c-primary);
  border-color: transparent;
  color: #dfe6f0;
}
.board--inverted .board__title { color: var(--c-white); }
.board--inverted .board__head { border-bottom-color: rgba(192, 192, 192, 0.25); }
.board--inverted .board__summary { color: #c9d2e0; }
.board--inverted .board__evidence {
  background: rgba(255, 255, 255, 0.06);
  border-left-color: var(--c-accent);
  color: #dfe6f0;
}
.board--inverted .board__links { border-top-color: rgba(192, 192, 192, 0.25); }
.stat {
  padding: 22px 24px;
  background: var(--c-light);
  border: 1px solid var(--c-border);
  border-top: 4px solid var(--c-accent);
}
.stat__value {
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 4vw, 3rem);
  line-height: 1;
  color: var(--c-primary);
}
.stat__accent { color: var(--c-accent); }
.stat__label { font-size: 13px; letter-spacing: 0.08em; color: var(--c-text-2); }
.stat--gold { border-top-color: var(--c-gold); }
.stat--dark {
  background: var(--c-dark);
  border-color: rgba(192, 192, 192, 0.2);
  color: #dfe6f0;
}
.stat--dark .stat__value { color: var(--c-white); }
.stat--dark .stat__label { color: var(--c-silver); }

/* ========== 9. Image Container Base ========== */
.thumb {
  position: relative;
  display: block;
  overflow: hidden;
  background:
    radial-gradient(circle at 78% 28%, rgba(255, 107, 26, 0.38) 0%, transparent 55%),
    linear-gradient(135deg, var(--c-primary) 0%, var(--c-dark) 60%, #0e2549 100%);
}
.thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(45deg, rgba(192, 192, 192, 0.1) 0 1px, transparent 1px 14px),
    linear-gradient(110deg, transparent 20%, rgba(255, 255, 255, 0.08) 50%, transparent 80%);
  transition: transform 350ms ease;
}
.thumb::after {
  content: "";
  position: absolute;
  top: 58%;
  left: -8%;
  width: 116%;
  height: 2px;
  background: var(--c-accent);
  opacity: 0.65;
  transform: rotate(-8deg);
  box-shadow: 0 0 12px rgba(255, 107, 26, 0.5);
}
.thumb--wide { aspect-ratio: 16 / 9; }
.thumb--square { aspect-ratio: 1 / 1; }
.thumb--portrait { aspect-ratio: 3 / 4; }
.thumb img,
.thumb video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.thumb:hover::before { transform: scale(1.08); }
@media (min-width: 900px) {
  .thumb--wide { height: 300px; aspect-ratio: auto; }
  .thumb--portrait { height: 360px; aspect-ratio: auto; }
}

/* ========== 10. Page Hero, Breadcrumb, Misc ========== */
.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-primary);
  color: #dfe6f0;
  padding: clamp(3.5rem, 8vw, 6.5rem) 0;
}
.page-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -8%;
  width: 52%;
  height: 140%;
  background:
    linear-gradient(135deg, rgba(255, 107, 26, 0.35) 0%, transparent 60%),
    repeating-linear-gradient(120deg, rgba(192, 192, 192, 0.14) 0 1px, transparent 1px 18px);
  clip-path: polygon(100% 0, 100% 100%, 18% 100%, 0 22%, 12% 0);
  transform: skewX(-6deg);
  pointer-events: none;
}
.page-hero__inner { position: relative; z-index: 1; }
.page-title {
  margin: 0 0 16px;
  font-size: clamp(2.75rem, 7vw, 4.75rem);
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--c-white);
}
.page-subtitle {
  max-width: 680px;
  margin: 0 0 24px;
  font-size: 17px;
  color: #c9d2e0;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 18px;
  padding: 12px 16px;
  background: rgba(192, 192, 192, 0.18);
  border-left: 3px solid var(--c-accent);
  font-size: 13px;
  color: var(--c-text-2);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumb__item:not(:last-child)::after { content: "›"; color: var(--c-accent); }
.breadcrumb__link { color: var(--c-text-2); text-decoration: none; }
.breadcrumb__link:hover { color: var(--c-accent); }
.breadcrumb__current { color: var(--c-text); font-weight: 600; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--c-accent); }
.eyebrow--silver { color: var(--c-silver); }
.eyebrow--silver::before { background: var(--c-silver); }
.divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 8px 0 24px;
  color: var(--c-silver);
  font-size: 12px;
  letter-spacing: 0.2em;
}
.divider::before,
.divider::after { content: ""; flex: 1; height: 1px; background: var(--c-border); }
.divider__tag { padding: 2px 8px; border: 1px solid var(--c-border); }

/* ========== 11. Back to Top & Reveal ========== */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 150;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(192, 192, 192, 0.55);
  background: var(--c-dark);
  color: var(--c-silver);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 200ms ease, visibility 200ms ease, transform 200ms ease, color var(--ease), border-color var(--ease);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}
.back-to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover {
  color: var(--c-white);
  border-color: var(--c-accent);
  background: var(--c-primary);
}
.back-to-top:focus-visible { clip-path: none; outline: 3px solid var(--c-accent); outline-offset: 2px; }
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 550ms ease, transform 550ms ease;
}
.js [data-reveal][data-revealed] { opacity: 1; transform: none; }

/* ========== 12. Focus & Reduced Motion ========== */
:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 2px; }
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible { outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  html { scroll-behavior: auto !important; }
  .js [data-reveal], .js [data-reveal][data-revealed] { opacity: 1; transform: none; }
}