/* ============================================================
   悦盈体育 全站共享样式 /assets/site.css
   创意系统：技术蓝图网格 × 实时体育数据直播台
   ============================================================ */

/* ---------- 1. Reset & Variables ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #0B1D28;
  --color-bg-elevated: #122A3A;
  --color-accent: #C6FF3D;
  --color-accent-alt: #FF7A2F;
  --color-wine: #5C1A2B;
  --color-indigo: #2E1A5C;
  --color-text: #F2EFE9;
  --color-text-muted: #9BB0B8;
  --color-paper: #E8E5DF;
  --color-grid: rgba(255, 255, 255, 0.12);

  --font-display: 'Archivo', 'Arial Black', sans-serif;
  --font-hero: 'Archivo', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --container-w: 1240px;
  --gutter: 32px;
  --header-topbar-h: 32px;
  --header-main-h: 80px;
  --transition: 0.25s ease;
}

/* ---------- 2. Base ---------- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-hero);
  font-weight: 200;
  line-height: 1.25;
  color: var(--color-text);
}

p { margin-bottom: 1rem; }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--color-accent-alt); }

ul, ol { padding-left: 1.25rem; }

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

/* ---------- 3. Utilities ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 2000;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.75rem 1.5rem;
  border-radius: 2px;
  transition: top 0.2s ease, opacity 0.2s ease;
  opacity: 0;
}

.skip-link:focus {
  top: 1rem;
  opacity: 1;
  outline: none;
}

/* ---------- 4. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
}

.site-header__topbar {
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--color-grid);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-header__topbar-inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-topbar-h);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.site-header__topbar-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-right: 0.375rem;
  vertical-align: middle;
  animation: live-dot-pulse 2s ease-in-out infinite;
}

@keyframes live-dot-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(198, 255, 61, 0.4); }
  50% { opacity: 0.65; box-shadow: 0 0 0 5px rgba(198, 255, 61, 0); }
}

.site-header__main {
  position: relative;
  background-color: var(--color-bg);
  background-image:
    linear-gradient(to right, var(--color-grid) 1px, transparent 1px);
  background-size: calc(100% / 12) 100%;
  border-bottom: 1px solid var(--color-grid);
}

.site-header__main::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 160px;
  height: 2px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
  pointer-events: none;
}

.site-header__inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-main-h);
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  flex-shrink: 0;
  text-decoration: none;
}

.brand:hover { color: inherit; }

.brand__mark {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  flex-shrink: 0;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-hero);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-text);
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.59375rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Navigation */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0.125rem;
}

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 0.375rem;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition);
}

.site-nav__link:hover { color: var(--color-text); }

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.59375rem;
  color: var(--color-text-muted);
  opacity: 0.55;
  transition: opacity var(--transition), color var(--transition);
}

.site-nav__link:hover .site-nav__index {
  opacity: 1;
  color: var(--color-accent);
}

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

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

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition), left var(--transition);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  width: 100%;
  left: 0;
}

/* Header contact ticket */
.site-header__contact {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.5rem 1.75rem 0.5rem 1.25rem;
  background: rgba(255, 122, 47, 0.08);
  border: 1px solid rgba(255, 122, 47, 0.35);
  border-left: 3px solid var(--color-accent-alt);
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 50%, calc(100% - 14px) 100%, 0 100%);
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.site-header__contact:hover {
  background: rgba(255, 122, 47, 0.18);
  border-color: var(--color-accent-alt);
  color: var(--color-text);
}

.site-header__contact-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.site-header__contact-title {
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-text);
}

.site-header__contact-mail {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.site-header__contact-note {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-header__contact-icon {
  font-size: 1.125rem;
  line-height: 1;
  color: var(--color-accent-alt);
}

/* Nav toggle (hamburger) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--color-grid);
  border-radius: 2px;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: border-color var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-of-type(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-of-type(2) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Progress bar */
.site-header__progress {
  height: 2px;
  background: rgba(255, 255, 255, 0.06);
  position: relative;
}

.site-header__progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: var(--color-accent);
  transition: width 0.15s ease-out;
}

/* ---------- 5. Mobile Navigation ---------- */
@media (max-width: 1099px) {
  .site-header__contact { display: none; }

  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex: none;
    display: block;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-grid);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    transition:
      max-height 0.35s ease,
      opacity 0.25s ease,
      transform 0.35s ease,
      visibility 0.35s;
  }

  .site-nav[data-open] {
    max-height: 480px;
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 0.5rem 1rem 0.75rem;
  }

  .site-nav__link {
    justify-content: flex-start;
    padding: 0.875rem 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .site-nav__item:last-child .site-nav__link {
    border-bottom: none;
  }
}

@media (max-width: 767px) {
  :root {
    --header-topbar-h: 0px;
    --header-main-h: 64px;
    --gutter: 20px;
  }

  .site-header__topbar { display: none; }

  .brand__name { font-size: 1.125rem; }

  .brand__tagline { font-size: 0.53125rem; }

  .brand__mark { width: 38px; height: 38px; font-size: 1.125rem; }

  .nav-toggle { width: 40px; height: 40px; }
}

@media (max-width: 420px) {
  .site-header__inner { gap: 0.75rem; }
  .site-nav__link { padding-inline: 0.5rem; }
}

/* ---------- 6. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 4rem;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
  border-top: 1px solid var(--color-grid);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 180px;
  height: 3px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 28px) 100%, 0 100%);
  pointer-events: none;
}

.site-footer__top {
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 64px var(--gutter) 48px;
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1.4fr;
  gap: 48px;
}

.site-footer__brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

.brand--footer .brand__mark {
  width: 48px;
  height: 48px;
  font-size: 1.375rem;
}

.site-footer__tagline {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  max-width: 36ch;
  margin: 0;
}

.site-footer__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0;
}

.site-footer__status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: live-dot-pulse 2s ease-in-out infinite;
}

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

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 1.25rem;
  padding-bottom: 0.625rem;
  border-bottom: 1px solid var(--color-grid);
}

.site-footer__heading-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-accent);
  opacity: 0.8;
}

.site-footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.site-footer__links a {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
  transition: color var(--transition), transform var(--transition);
}

.site-footer__links a:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.site-footer__links--contact {
  gap: 0.5rem;
}

.site-footer__contact-item {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.site-footer__ribbon {
  background: var(--color-wine);
  border-top: 2px solid rgba(255, 122, 47, 0.6);
  padding: 0.5rem 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 2rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.site-footer__bottom {
  background: rgba(0, 0, 0, 0.22);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.site-footer__bottom-inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 18px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.site-footer__copyright,
.site-footer__icp,
.site-footer__quote {
  margin: 0;
}

.site-footer__quote {
  color: var(--color-text-muted);
  opacity: 0.7;
}

@media (max-width: 1099px) {
  .site-footer__top {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
  }

  .site-footer__brand-col { grid-column: 1 / -1; }
}

@media (max-width: 767px) {
  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    padding: 40px 20px 32px;
    gap: 32px 24px;
  }

  .site-footer__brand-col { grid-column: 1 / -1; }

  .site-footer__col:nth-child(3) { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .site-footer__top { grid-template-columns: 1fr; }

  .site-footer__col:nth-child(3) { grid-column: auto; }
}

/* ---------- 7. Layout Components ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: 80px;
  position: relative;
}

.section--tight {
  padding-block: 44px;
}

.section__index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-block;
  margin-bottom: 0.625rem;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 200;
  margin-bottom: 0.75rem;
}

.section__lead {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: 2rem;
}

.page-head {
  padding-block: 64px 40px;
  border-bottom: 1px solid var(--color-grid);
  margin-bottom: 48px;
}

.page-head__index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-bottom: 0.75rem;
}

.page-head__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 200;
  line-height: 1.12;
  letter-spacing: 0.02em;
}

.page-head__lead {
  max-width: 60ch;
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-top: 0.75rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-6 { grid-column: span 6; }
.col-span-8 { grid-column: span 8; }
.col-span-12 { grid-column: span 12; }

@media (max-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }

  .grid--3 { grid-template-columns: repeat(2, 1fr); }

  .col-span-8, .col-span-6 { grid-column: span 12; }
}

@media (max-width: 640px) {
  .grid,
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .col-span-2,
  .col-span-3,
  .col-span-4,
  .col-span-6,
  .col-span-8,
  .col-span-12 { grid-column: span 1; }
}

/* ---------- 8. Text Container & Breadcrumb ---------- */
.text-container {
  max-width: 72ch;
  margin-inline: auto;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text);
}

.text-container h2 {
  font-size: 1.375rem;
  font-weight: 500;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

.text-container h3 {
  font-size: 1.125rem;
  font-weight: 500;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.text-container p {
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
}

.text-container strong { color: var(--color-text); }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  margin-bottom: 2rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumb__item { display: inline-flex; align-items: center; }

.breadcrumb__link {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumb__link:hover { color: var(--color-accent); }

.breadcrumb__separator {
  color: var(--color-text-muted);
  opacity: 0.4;
  margin-inline: 0.125rem;
}

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

/* ---------- 9. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-text);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  padding: 0.875rem 1.75rem;
  cursor: pointer;
  text-decoration: none;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition),
    transform var(--transition);
}

.btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: transparent;
  color: var(--color-accent);
}

.btn--alt {
  background: var(--color-accent-alt);
  border-color: var(--color-accent-alt);
  color: var(--color-bg);
}

.btn--alt:hover {
  background: transparent;
  color: var(--color-accent-alt);
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--color-text);
}

.btn--ghost:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.btn--small {
  font-size: 0.75rem;
  padding: 0.625rem 1.125rem;
}

/* ---------- 10. Cards ---------- */
.card {
  position: relative;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-grid);
  border-radius: 2px;
  padding: 1.5rem;
}

.card--data {
  border-top: 3px solid var(--color-accent);
}

.card--alarm {
  border-top: 3px solid var(--color-accent-alt);
}

.card--info {
  background: var(--color-indigo);
}

.panel {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-grid);
  border-radius: 2px;
  padding: 1.5rem;
}

.panel--wine { background: var(--color-wine); }

.panel--indigo { background: var(--color-indigo); }

/* ---------- 11. Stats & Data ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.25rem;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-grid);
  border-top: 3px solid var(--color-accent);
  border-radius: 2px;
}

.stat__value {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--color-accent);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 0.65625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.stat__extra {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.data-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding-block: 0.625rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.data-line:last-child { border-bottom: none; }

.data-line__name {
  color: var(--color-text-muted);
  flex-shrink: 1;
}

.data-line__value {
  color: var(--color-text);
  font-weight: 700;
  white-space: nowrap;
}

.data-line__value--accent { color: var(--color-accent); }

.data-line__value--alt { color: var(--color-accent-alt); }

/* ---------- 12. Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--color-bg-elevated);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 2px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.75rem;
  white-space: nowrap;
}

.tag--accent {
  color: var(--color-accent);
  border-color: rgba(198, 255, 61, 0.4);
}

.tag--alt {
  color: var(--color-accent-alt);
  border-color: rgba(255, 122, 47, 0.4);
}

/* ---------- 13. Image Frames ---------- */
.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-grid);
  border-radius: 2px;
}

.image-frame::before {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.image-frame--portrait::before { padding-top: 133.33%; }

.image-frame--wide::before { padding-top: 42.857%; }

.image-frame--backdrop {
  min-height: 70vh;
  border: none;
  border-radius: 0;
}

.image-frame--backdrop::before {
  display: none;
}

.image-frame::after {
  content: 'IMG// ' attr(data-index);
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  background: rgba(11, 29, 40, 0.65);
  padding: 0.25rem 0.5rem;
  border-left: 2px solid var(--color-accent);
}

/* ---------- 14. Tabs ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--color-grid);
  margin-bottom: 1.5rem;
}

.tabs__btn {
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.tabs__btn:hover {
  color: var(--color-text);
}

.tabs__btn[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tabs__panel {
  padding-top: 1.25rem;
}

.tabs__panel[hidden] { display: none; }

/* ---------- 15. Accordion ---------- */
.accordion {
  border-top: 1px solid var(--color-grid);
}

.accordion__item {
  border-bottom: 1px solid var(--color-grid);
}

.accordion__btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.125rem 0;
  background: none;
  border: none;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}

.accordion__btn:hover {
  color: var(--color-accent);
}

.accordion__btn::after {
  content: '+';
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

.accordion__btn[aria-expanded="true"]::after {
  transform: rotate(45deg);
}

.accordion__panel {
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  transition: max-height 0.3s ease, visibility 0.3s ease, margin 0.3s ease;
}

.accordion__panel[data-open] {
  max-height: 600px;
  visibility: visible;
}

.accordion__panel-inner {
  padding: 0.25rem 0 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ---------- 16. Focus & Reduced Motion ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .site-header__topbar-dot,
  .site-footer__status-dot {
    animation: none !important;
  }
}