/* ============================================================
   AB乐界 Site Kit — /assets/site.css
   赛博国潮档案夹 · 展览画册式导航系统
   ============================================================ */

/* ---------- 1. CSS Variables ---------- */
:root {
  --color-deep: #0A1F44;
  --color-neon: #39FF14;
  --color-signal: #FF6D00;
  --color-rock: #1C2E4A;
  --color-moss: #2D4A22;
  --color-terra: #B65D3A;
  --color-cream: #F5F0E8;
  --color-mist: #B0B8C4;

  --font-head: "Noto Sans CJK SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Alibaba PuHuiTi", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --container-max: 1200px;
  --header-h: 72px;
  --radius: 14px;
  --dur: 0.35s;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --z-progress: 300;
  --z-skip: 250;
  --z-header: 100;
  --z-nav: 90;
}

/* ---------- 2. Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-cream);
  background:
    radial-gradient(ellipse at 88% -10%, rgba(57, 255, 20, 0.055), transparent 55%),
    var(--color-deep);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: var(--color-neon);
  color: var(--color-deep);
}

/* ---------- 3. Typography ---------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

.page-title {
  font-size: clamp(32px, 4.4vw, 46px);
  letter-spacing: 0.01em;
  color: var(--color-cream);
}

.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--color-neon);
  margin-bottom: 14px;
  padding-left: 18px;
  position: relative;
}

.kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 10px;
  background: var(--color-signal);
  transform: translateY(-50%);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

.lead-text {
  font-size: 18px;
  line-height: 1.75;
  color: var(--color-mist);
  max-width: 640px;
}

.text-accent {
  color: var(--color-neon);
}

/* ---------- 4. Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.content-wrap {
  padding-block-start: calc(var(--header-h) + 48px);
  padding-block-end: 96px;
}

.section {
  padding-block: 88px;
}

.section--tight {
  padding-block: 48px;
}

.section--dim {
  background: var(--color-rock);
  border-block: 1px solid rgba(57, 255, 20, 0.08);
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 1023.98px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 639.98px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 5. Accessibility ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: -64px;
  left: 20px;
  z-index: var(--z-skip);
  background: var(--color-neon);
  color: var(--color-deep);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  padding: 14px 24px;
  border-radius: 0 0 10px 10px;
  transition: top 0.3s var(--ease);
}

.skip-link:focus-visible {
  top: 0;
}

:focus-visible {
  outline: 2px solid var(--color-neon);
  outline-offset: 3px;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 8px);
}

body.nav-locked {
  overflow: hidden;
}

/* ---------- 6. Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: transparent;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-header::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-neon) 0%, rgba(57, 255, 20, 0.4) 24%, transparent 70%);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  pointer-events: none;
}

.site-header.is-scrolled {
  background: var(--color-deep);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.site-header.is-scrolled::after {
  opacity: 0.45;
}

.site-header__inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--color-neon);
  color: var(--color-deep);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 20px;
  clip-path: polygon(18% 0, 100% 0, 100% 82%, 82% 100%, 0 100%, 0 18%);
  transition: box-shadow 0.3s var(--ease);
}

.site-brand:hover .site-brand__mark {
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.4);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.05;
}

.site-brand__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--color-cream);
  white-space: nowrap;
}

.site-brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--color-mist);
  white-space: nowrap;
}

.site-brand__icp {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--color-mist);
  border-left: 1px solid rgba(245, 240, 232, 0.25);
  padding-left: 14px;
  line-height: 1.2;
  transition: color 0.25s var(--ease);
}

.site-brand__icp:hover,
.site-brand__icp:focus-visible {
  color: var(--color-neon);
}

/* ---------- 7. Navigation ---------- */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(245, 240, 232, 0.85);
  padding: 12px;
  position: relative;
  white-space: nowrap;
  transition: color 0.25s var(--ease);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--color-mist);
  opacity: 0.7;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 2px;
  background: var(--color-neon);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.5);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-cream);
}

.site-nav__link:hover .site-nav__index,
.site-nav__link:focus-visible .site-nav__index {
  color: var(--color-neon);
  opacity: 1;
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-neon);
}

.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--color-signal);
  opacity: 1;
}

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 6px;
  position: relative;
  z-index: 110;
  transition: background 0.25s var(--ease);
}

.nav-toggle:hover {
  background: rgba(245, 240, 232, 0.08);
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-cream);
  border-radius: 2px;
  transition: transform 0.35s var(--ease), opacity 0.25s var(--ease), background 0.25s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-neon);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0.3);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--color-neon);
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }
}

@media (max-width: 899.98px) {
  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-nav);
    background:
      linear-gradient(180deg, rgba(10, 31, 68, 0.97), rgba(8, 24, 56, 0.98)),
      var(--color-deep);
    padding: clamp(24px, 5vh, 40px) clamp(20px, 6vw, 40px) 56px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), visibility 0.35s;
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__item {
    border-bottom: 1px solid rgba(245, 240, 232, 0.08);
  }

  .site-nav__link {
    display: flex;
    align-items: baseline;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    padding: 18px 8px;
    white-space: normal;
  }

  .site-nav__index {
    font-size: 12px;
    min-width: 22px;
  }

  .site-nav__link::after {
    left: 0;
    right: auto;
    top: 0;
    bottom: 0;
    width: 3px;
    height: 100%;
    box-shadow: none;
    transform: scaleY(0);
    transform-origin: bottom;
  }

  .site-nav__link:hover::after,
  .site-nav__link:focus-visible::after,
  .site-nav__link[aria-current="page"]::after {
    transform: scaleY(1);
  }
}

@media (max-width: 479.98px) {
  :root {
    --header-h: 64px;
  }

  .site-brand__sub,
  .site-brand__icp {
    display: none;
  }
}

/* ---------- 8. Footer ---------- */
.site-footer {
  position: relative;
  background:
    radial-gradient(ellipse at 100% 100%, rgba(57, 255, 20, 0.055), transparent 55%),
    var(--color-deep);
  overflow: hidden;
  border-top: 1px solid rgba(57, 255, 20, 0.12);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(57, 255, 20, 0.65) 22%, rgba(255, 109, 0, 0.65) 78%, transparent);
  pointer-events: none;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.6fr 1.1fr 1fr;
  gap: clamp(24px, 5vw, 64px);
  padding-block: clamp(48px, 7vw, 80px) clamp(40px, 6vw, 64px);
}

.site-footer__col {
  min-width: 0;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.site-footer__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--color-neon);
  color: var(--color-deep);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 17px;
  clip-path: polygon(18% 0, 100% 0, 100% 82%, 82% 100%, 0 100%, 0 18%);
  transition: box-shadow 0.3s var(--ease);
}

.site-footer__brand:hover .site-footer__mark {
  box-shadow: 0 0 16px rgba(57, 255, 20, 0.35);
}

.site-footer__brand-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.1em;
  color: var(--color-cream);
}

.site-footer__tagline {
  font-size: 13px;
  color: var(--color-mist);
  margin-bottom: 20px;
  max-width: 280px;
  line-height: 1.6;
  border-left: 2px solid rgba(57, 255, 20, 0.35);
  padding-left: 12px;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.site-footer__nav a {
  position: relative;
  font-size: 14px;
  color: var(--color-mist);
  padding-block: 2px;
  transition: color 0.25s var(--ease);
}

.site-footer__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--color-neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.site-footer__nav a:hover,
.site-footer__nav a:focus-visible {
  color: var(--color-neon);
}

.site-footer__nav a:hover::after,
.site-footer__nav a:focus-visible::after {
  transform: scaleX(1);
}

.site-footer__heading {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-cream);
  margin-bottom: 20px;
  padding-left: 14px;
  position: relative;
}

.site-footer__heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 15px;
  background: var(--color-signal);
  clip-path: polygon(0 0, 100% 30%, 100% 70%, 0 100%);
}

.site-footer__list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(245, 240, 232, 0.07);
}

.site-footer__list li:first-child {
  padding-top: 0;
}

.site-footer__list li:last-child {
  border-bottom: 0;
}

.site-footer__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--color-mist);
  opacity: 0.75;
}

.site-footer__text {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-cream);
  word-break: break-word;
}

.site-footer__text--accent {
  color: var(--color-neon);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.site-footer__icp {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-cream);
  padding: 8px 14px;
  border: 1px dashed rgba(57, 255, 20, 0.4);
  border-radius: 4px;
  margin-bottom: 18px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.site-footer__icp:hover,
.site-footer__icp:focus-visible {
  border-color: var(--color-neon);
  color: var(--color-neon);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.15);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 20px;
}

.site-footer__links a {
  position: relative;
  font-size: 14px;
  color: var(--color-mist);
  padding-block: 2px;
  transition: color 0.25s var(--ease);
}

.site-footer__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--color-signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--color-signal);
}

.site-footer__links a:hover::after,
.site-footer__links a:focus-visible::after {
  transform: scaleX(1);
}

.site-footer__note {
  font-size: 12px;
  line-height: 1.75;
  color: var(--color-mist);
  opacity: 0.72;
  max-width: 280px;
  border-left: 2px solid rgba(255, 109, 0, 0.4);
  padding-left: 12px;
}

.site-footer__bottom {
  border-top: 1px solid rgba(245, 240, 232, 0.08);
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding-block: 18px;
  font-size: 13px;
  color: var(--color-mist);
  font-family: var(--font-mono);
}

.site-footer__slogan {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(57, 255, 20, 0.7);
}

@media (min-width: 1024px) {
  .site-footer__col + .site-footer__col {
    border-left: 1px solid rgba(245, 240, 232, 0.07);
    padding-left: clamp(24px, 3vw, 40px);
  }
}

@media (max-width: 1023.98px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__col--brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 639.98px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__col--brand {
    grid-column: auto;
  }
}

/* ---------- 9. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 6px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  color: var(--color-deep);
  background: var(--color-neon);
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background-color 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(245, 240, 232, 0.35) 45%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.6s var(--ease);
}

.btn:hover::after {
  transform: translateX(120%);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(57, 255, 20, 0.25);
}

.btn--signal {
  background: var(--color-signal);
  color: var(--color-cream);
}

.btn--signal:hover,
.btn--signal:focus-visible {
  box-shadow: 0 8px 24px rgba(255, 109, 0, 0.28);
}

.btn--ghost {
  background: transparent;
  color: var(--color-cream);
  border-color: var(--color-mist);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--color-neon);
  color: var(--color-neon);
  box-shadow: none;
}

.btn--small {
  padding: 9px 18px;
  font-size: 13px;
}

/* ---------- 10. Cards ---------- */
.card {
  background: var(--color-rock);
  border: 1px solid rgba(176, 184, 196, 0.14);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, transparent 50%, rgba(57, 255, 20, 0.08) 50%);
  transition: transform 0.3s var(--ease);
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(57, 255, 20, 0.28);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.card:hover::before {
  transform: scale(1.15);
}

.card__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-cream);
}

.card__body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-mist);
}

/* ---------- 11. Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid rgba(176, 184, 196, 0.3);
  background: transparent;
  color: var(--color-mist);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.tag:hover,
.tag:focus-visible {
  color: var(--color-neon);
  border-color: var(--color-neon);
}

.tag.is-active {
  color: var(--color-deep);
  background: var(--color-neon);
  border-color: var(--color-neon);
  box-shadow: 0 0 14px rgba(57, 255, 20, 0.3);
}

.tag--signal.is-active {
  background: var(--color-signal);
  border-color: var(--color-signal);
  color: var(--color-cream);
  box-shadow: 0 0 14px rgba(255, 109, 0, 0.3);
}

/* ---------- 12. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 36px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-mist);
}

.breadcrumb__link {
  color: var(--color-mist);
  transition: color 0.25s var(--ease);
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--color-neon);
}

.breadcrumb__sep {
  opacity: 0.4;
  color: var(--color-mist);
}

.breadcrumb__current {
  color: var(--color-neon);
}

/* ---------- 13. Image Boxes ---------- */
.img-box {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-rock);
  border: 1px solid rgba(57, 255, 20, 0.14);
  aspect-ratio: 16 / 9;
}

.img-box--square {
  aspect-ratio: 1 / 1;
}

.img-box--portrait {
  aspect-ratio: 3 / 4;
}

.img-box--tall {
  aspect-ratio: 4 / 5;
}

.img-box img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-box::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(115deg, transparent 60%, rgba(57, 255, 20, 0.08)),
    repeating-linear-gradient(180deg, transparent 0 6px, rgba(10, 31, 68, 0.06) 6px 7px);
  mix-blend-mode: screen;
}

.img-box--placeholder::before {
  content: "图像占位";
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(176, 184, 196, 0.4);
}

/* ---------- 14. Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: var(--z-progress);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-neon), var(--color-signal));
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.55);
}

/* ---------- 15. Reveal Motion ---------- */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

.js-enabled [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 16. Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  .js-enabled [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}