:root {
  --c-midnight: #0A1020;
  --c-night: #111A33;
  --c-neon: #3BFF8C;
  --c-orange: #FF9F1C;
  --c-cream: #F2F5FA;
  --c-stone: #A9B2C9;
  --c-line: #2A3556;
  --c-hover: #1F3A3A;

  --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-head: 'Alibaba PuHuiTi', 'Source Han Sans CN', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', monospace;

  --content-max: 1200px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --radius: 6px;
  --shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  --nav-width: 260px;
  --header-h: 68px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

@media screen and (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-cream);
  background-color: var(--c-midnight);
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  min-height: 100vh;
}

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

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

ul, ol {
  list-style: none;
}

button, input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 12px 20px;
  background: var(--c-neon);
  color: var(--c-midnight);
  font-weight: 700;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: top 0.2s ease;
}

.skip-link:focus-visible {
  top: 16px;
}

.progress-indicator {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  min-width: 0;
  background: linear-gradient(90deg, var(--c-neon), var(--c-orange));
  transform-origin: left;
  transform: scaleX(0);
  z-index: 1500;
  pointer-events: none;
}

.site-header {
  position: relative;
  z-index: 1000;
  background: rgba(10, 16, 32, 0.92);
  border-right: 1px solid var(--c-line);
  backdrop-filter: blur(14px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 var(--space-3);
  min-height: var(--header-h);
}

.site-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.2;
}

.site-brand__mark {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--c-cream);
}

.site-brand__tagline {
  font-size: 12px;
  color: var(--c-stone);
  letter-spacing: 0.02em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-cream);
}

.nav-toggle__bars {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--c-neon);
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--c-neon);
  transition: transform 0.2s ease;
}

.nav-toggle__bars::before {
  top: -6px;
}

.nav-toggle__bars::after {
  top: 6px;
}

[data-open] .nav-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

[data-open] .nav-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-toggle__label {
  font-size: 14px;
  font-weight: 600;
}

.site-nav {
  order: 3;
  width: 100%;
  border-top: 1px solid var(--c-line);
  display: none;
}

.site-nav[data-open] {
  display: block;
}

.site-nav__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
}

.site-nav__link {
  display: block;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-stone);
  border-bottom: 1px solid var(--c-line);
  transition: background 0.2s ease, color 0.2s ease;
}

.site-nav__link:hover {
  background: var(--c-hover);
  color: var(--c-cream);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-neon);
  box-shadow: inset 3px 0 0 var(--c-neon);
}

.site-search {
  order: 2;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 200px;
  padding: 6px 12px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: rgba(17, 26, 51, 0.7);
  transition: border-color 0.2s ease;
}

.site-search:focus-within {
  border-color: var(--c-neon);
}

.site-search__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.site-search__input {
  flex: 1;
  min-width: 0;
  padding: 6px 0;
  background: transparent;
  border: none;
  outline: none;
  color: var(--c-cream);
  font-size: 14px;
}

.site-search__input::placeholder {
  color: var(--c-stone);
}

.site-search__icon {
  color: var(--c-stone);
  display: inline-flex;
}

.site-footer {
  background: var(--c-night);
  border-top: 1px solid var(--c-line);
  margin-top: var(--space-6);
}

.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-5) var(--space-3) var(--space-3);
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--space-4);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.site-footer__trust {
  font-size: 14px;
  color: var(--c-stone);
  line-height: 1.7;
  max-width: 360px;
}

.site-footer__heading {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-cream);
  margin-bottom: var(--space-2);
  letter-spacing: 0.04em;
}

.site-footer__list,
.site-footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__link {
  font-size: 14px;
  color: var(--c-stone);
  transition: color 0.15s ease;
}

.site-footer__link:hover {
  color: var(--c-neon);
}

.site-footer__text {
  font-size: 14px;
  color: var(--c-stone);
  word-break: break-word;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--c-line);
  font-size: 13px;
  color: var(--c-stone);
}

.site-footer__back {
  color: var(--c-neon);
  font-weight: 600;
  transition: opacity 0.15s ease;
}

.site-footer__back:hover {
  opacity: 0.8;
}

.site-content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-4) var(--space-3);
  min-height: 60vh;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--c-stone);
  margin-bottom: var(--space-4);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--c-line);
  margin-right: 8px;
}

.breadcrumb a {
  color: var(--c-stone);
  transition: color 0.15s ease;
}

.breadcrumb a:hover {
  color: var(--c-neon);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-cream);
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn--primary {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: var(--c-midnight);
}

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

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

.btn--ghost:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.card {
  position: relative;
  background: var(--c-night);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: var(--space-3);
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.card--hover:hover {
  background: var(--c-hover);
  border-color: var(--c-neon);
  transform: translateY(-3px);
}

.card__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-cream);
  margin-bottom: var(--space-1);
}

.card__text {
  font-size: 14px;
  color: var(--c-stone);
  margin-bottom: var(--space-2);
}

.index-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 999px;
  line-height: 1.4;
}

.index-tag--green {
  background: rgba(59, 255, 140, 0.12);
  color: var(--c-neon);
  border: 1px solid rgba(59, 255, 140, 0.25);
}

.index-tag--orange {
  background: rgba(255, 159, 28, 0.12);
  color: var(--c-orange);
  border: 1px solid rgba(255, 159, 28, 0.25);
}

.score {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  color: var(--c-cream);
}

.score--big {
  font-size: 30px;
  color: var(--c-neon);
}

.vertical-note {
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-stone);
  text-transform: uppercase;
  border-left: 1px solid var(--c-line);
  padding-left: 12px;
}

.media-offset__visual {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-night);
  min-height: 0;
}

.media-frame {
  position: relative;
  width: 100%;
  background: var(--c-night);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.media-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.media-frame[data-media="portrait"]::before {
  padding-top: 125%;
}

.media-frame[data-media="square"]::before {
  padding-top: 100%;
}

.media-frame__placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 32px 32px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-stone);
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1200;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: var(--c-night);
  color: var(--c-neon);
  font-size: 14px;
  font-weight: 700;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.back-to-top[data-visible] {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  transform: translateY(-3px);
  border-color: var(--c-neon);
}

@media screen and (min-width: 960px) {
  body {
    background-size: 64px 64px;
  }

  .site-header {
    width: var(--nav-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(10, 16, 32, 0.92);
    backdrop-filter: blur(14px);
    border-right: 1px solid var(--c-line);
    border-bottom: none;
  }

  .site-header__inner {
    height: 100vh;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: var(--space-4) var(--space-3);
    gap: var(--space-3);
  }

  .site-brand {
    padding: 8px 0;
  }

  .site-brand__mark {
    font-size: 22px;
  }

  .site-nav {
    display: block;
    order: 0;
    border-top: none;
    width: 100%;
  }

  .site-nav__list {
    display: flex;
    flex-direction: column;
  }

  .site-nav__link {
    border-bottom: 1px solid var(--c-line);
    padding: 10px 0;
    font-size: 15px;
  }

  .site-search {
    margin-top: auto;
    width: 100%;
  }

  .site-header__inner::after {
    content: "JS-ANBO";
    position: absolute;
    bottom: 20px;
    left: 24px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--c-stone);
    opacity: 0.5;
  }

  .site-content,
  .site-footer__inner {
    margin-left: var(--nav-width);
  }

  .site-footer {
    margin-left: var(--nav-width);
  }

  .site-footer__bottom {
    max-width: calc(var(--content-max) - var(--nav-width));
  }
}

@media screen and (max-width: 959px) {
  .site-header__inner {
    flex-wrap: wrap;
    padding: 0 var(--space-2);
  }

  .site-brand {
    order: 0;
  }

  .site-search {
    order: 1;
    width: auto;
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
    order: 2;
  }

  .site-nav[data-open] {
    display: block;
    order: 3;
    width: 100%;
    border-top: 1px solid var(--c-line);
  }

  .site-search__input {
    width: 0;
    flex: 0 1 120px;
  }
}

@media screen and (max-width: 599px) {
  .site-header__inner {
    gap: 12px;
  }

  .site-search {
    min-width: 0;
    padding: 6px 10px;
  }

  .site-search__input {
    flex: 1 1 80px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}