:root {
  --color-bg: #0A0A0F;
  --color-bg-raised: #131320;
  --color-panel: #1C1C2A;
  --color-primary: #FF00FF;
  --color-primary-soft: rgba(255, 0, 255, 0.14);
  --color-cyan: #00E5FF;
  --color-cyan-soft: rgba(0, 229, 255, 0.12);
  --color-text: #F5F5F5;
  --color-muted: #A0A0B8;
  --color-warning: #FF3B30;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --container: 1240px;
  --gutter: clamp(16px, 3vw, 40px);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--color-bg);
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.012) 0,
    rgba(255, 255, 255, 0.012) 1px,
    transparent 1px,
    transparent 3px
  );
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

html,
body {
  overflow-x: hidden;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

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

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

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  margin-bottom: 0.35em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin-bottom: 0.5em;
}

h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5em;
}

p {
  margin: 0 0 1em;
}

#main-content {
  scroll-margin-top: calc(72px + 20px);
}

:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--color-primary);
  color: #000;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 500;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-cyan);
  color: #000;
  font-weight: 700;
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 400;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-cyan));
  box-shadow: 0 0 12px rgba(255, 0, 255, 0.45);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 120;
  margin: 0 0 32px;
  padding: 0 var(--gutter);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(8px, 1.5vw, 20px);
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px 8px 8px 14px;
  border: 1px solid rgba(255, 0, 255, 0.32);
  border-radius: var(--radius-pill);
  background: rgba(10, 10, 15, 0.86);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5), 0 0 22px rgba(255, 0, 255, 0.13);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  color: var(--color-text);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-cyan));
  color: #05050a;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 0 16px rgba(255, 0, 255, 0.55), inset 0 0 0 1px rgba(255, 255, 255, 0.3);
}

.brand__text {
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.06em;
}

.brand__neon {
  margin-left: 2px;
  color: var(--color-primary);
  text-shadow: 0 0 8px var(--color-primary), 0 0 18px var(--color-primary);
}

.site-nav {
  margin-inline: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 13px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav__link:hover {
  background: var(--color-cyan-soft);
  border-color: rgba(0, 229, 255, 0.55);
  color: var(--color-cyan);
}

.site-nav__link[aria-current="page"] {
  background: var(--color-primary-soft);
  border-color: rgba(255, 0, 255, 0.6);
  color: var(--color-primary);
  box-shadow: 0 0 14px rgba(255, 0, 255, 0.18);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn--small {
  min-height: 30px;
  padding: 0 12px;
  font-size: 12px;
}

.btn--large {
  min-height: 50px;
  padding: 0 30px;
  font-size: 16px;
}

.btn--neon {
  background: var(--color-primary);
  color: #05050a;
  box-shadow: 0 0 18px rgba(255, 0, 255, 0.34);
}

.btn--neon:hover {
  background: #ff3aff;
  color: #000;
  box-shadow: 0 0 24px rgba(255, 0, 255, 0.5);
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.26);
  color: var(--color-muted);
}

.btn--ghost:hover {
  background: var(--color-cyan-soft);
  border-color: var(--color-cyan);
  color: var(--color-cyan);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-pill);
  background: rgba(255, 0, 255, 0.08);
  cursor: pointer;
}

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

.nav-toggle__bar {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  box-shadow: 0 0 6px var(--color-primary);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.page-container {
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 88px) var(--gutter);
}

.section {
  max-width: var(--container);
  margin: clamp(40px, 6vw, 88px) auto;
  padding-inline: var(--gutter);
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.section__title {
  position: relative;
}

.section__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.5);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.section__more::after {
  content: "→";
  color: var(--color-cyan);
}

.section__more:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-hero {
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(60px, 10vw, 130px) var(--gutter) clamp(40px, 6vw, 80px);
}

.page-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-hero__eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 10px var(--color-primary);
}

.page-hero__title {
  margin-bottom: 0.35em;
  font-size: clamp(3.2rem, 9vw, 7.2rem);
  line-height: 0.92;
  text-shadow: 0 0 20px rgba(255, 0, 255, 0.35);
}

.page-hero__lead {
  max-width: 60ch;
  margin: 0;
  color: var(--color-muted);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.8;
}

.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));
}

.channel-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  border: 1px solid rgba(0, 229, 255, 0.14);
  border-radius: var(--radius-lg);
  background: var(--color-bg-raised);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.channel-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 24px rgba(255, 0, 255, 0.16);
  transform: translateY(-2px);
}

.channel-card__meta {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.channel-card__title {
  margin: 0;
  font-size: 20px;
  font-weight: 900;
}

.channel-card__desc {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.timeline {
  position: relative;
  display: grid;
  gap: 24px;
  margin: 24px 0;
  padding: 0 0 0 28px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-cyan));
  opacity: 0.7;
}

.timeline__item {
  position: relative;
  display: grid;
  gap: 4px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -27px;
  width: 12px;
  height: 12px;
  border: 3px solid var(--color-cyan);
  border-radius: 50%;
  background: var(--color-bg);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.8);
}

.timeline__time {
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.timeline__title {
  margin: 0;
  font-size: 18px;
  font-weight: 900;
}

.timeline__desc {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.panel {
  margin-bottom: 12px;
  padding: 4px 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.panel__summary {
  padding: 14px 0;
  color: var(--color-text);
  font-weight: 700;
  list-style: none;
  cursor: pointer;
}

.panel__summary::-webkit-details-marker {
  display: none;
}

.panel__summary:hover {
  color: var(--color-primary);
}

.panel__content {
  padding: 0 0 16px;
  color: var(--color-muted);
  font-size: 14px;
}

.notice {
  display: flex;
  gap: 12px;
  padding: 14px 18px;
  border: 1px solid rgba(255, 59, 48, 0.35);
  border-radius: 14px;
  background: rgba(255, 59, 48, 0.08);
  color: var(--color-text);
  font-size: 14px;
}

.notice--warning {
  border-color: rgba(255, 59, 48, 0.55);
  background: rgba(255, 59, 48, 0.12);
  color: #ffd3d0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 32px;
  padding: 0;
  list-style: none;
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--color-muted);
}

.breadcrumb__link {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 14px;
  text-decoration: none;
}

.breadcrumb__link:hover,
.breadcrumb__link[aria-current="page"] {
  color: var(--color-primary);
}

.image-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid rgba(0, 229, 255, 0.22);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 65% 30%, rgba(255, 0, 255, 0.22), transparent 36%),
    linear-gradient(115deg, transparent 44%, rgba(0, 229, 255, 0.16) 45%, transparent 52%),
    linear-gradient(135deg, rgba(255, 0, 255, 0.16), rgba(0, 229, 255, 0.12));
}

.image-frame__label {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 4px 10px;
  border: 1px solid rgba(0, 229, 255, 0.28);
  border-radius: var(--radius-pill);
  background: rgba(10, 10, 15, 0.72);
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
}

.site-footer {
  margin-top: clamp(56px, 8vw, 110px);
  padding: 0 var(--gutter) 28px;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) 2fr minmax(220px, 1fr);
  gap: 32px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px 28px 32px;
  border: 1px solid rgba(0, 229, 255, 0.16);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--color-bg-raised), #0e0e18);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.04);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.brand--footer {
  margin-bottom: 10px;
}

.site-footer__slogan {
  margin: 0;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.footer-nav__title {
  margin: 0 0 12px;
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-nav a {
  display: block;
  width: max-content;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  color: var(--color-muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-nav a:hover {
  border-bottom-color: var(--color-primary);
  color: var(--color-primary);
}

.site-footer__contact {
  padding-left: 20px;
  border-left: 1px solid rgba(255, 0, 255, 0.2);
  color: var(--color-muted);
  font-size: 14px;
}

.site-footer__contact p {
  margin: 0 0 8px;
}

.site-footer__trust {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 18px;
  border-top: 1px dashed rgba(0, 229, 255, 0.2);
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.7;
  text-align: center;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  max-width: var(--container);
  margin: 14px auto 0;
  padding: 14px 8px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.site-footer__legal {
  color: var(--color-warning);
}

@media (max-width: 1100px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__contact {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 980px) {
  .site-header__actions .btn {
    display: none;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    max-height: calc(100vh - 90px);
    overflow: auto;
    padding: 10px;
    border: 1px solid rgba(255, 0, 255, 0.35);
    border-radius: 22px;
    background: rgba(19, 19, 32, 0.98);
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .site-nav__link {
    justify-content: space-between;
    min-height: 44px;
    padding: 0 14px;
    font-size: 15px;
  }

  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-nav {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    padding: 32px 18px 24px;
  }

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

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

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

@media (max-width: 600px) {
  .site-header {
    top: 8px;
    margin-bottom: 20px;
  }

  .site-header__inner {
    padding: 6px 6px 6px 10px;
  }

  .brand__mark {
    width: 32px;
    height: 32px;
  }

  .brand__text {
    font-size: 16px;
  }
}

@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;
  }

  .channel-card:hover {
    transform: none;
  }
}