:root {
  --header-w: 280px;
  --header-h: 72px;
  --container-w: 1180px;
  --c-bg: #0B1026;
  --c-glass: #1A2340;
  --c-text: #E6F0FF;
  --c-text-dim: #93A8C7;
  --c-purple: #A44BFF;
  --c-green: #39FF88;
  --c-orange: #FF8C42;
  --c-cyan: #00E5FF;
  --c-white: #FFFFFF;
  --c-dark: #05070F;
  --font-head: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'JetBrains Mono', 'Roboto Mono', 'SF Mono', monospace;
  --radius-card: 22px;
  --space-section: clamp(4rem, 9vw, 8rem);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--c-bg);
  background-image:
    radial-gradient(circle at 85% 15%, rgba(164, 75, 255, 0.14), transparent 34rem),
    radial-gradient(circle at 40% 92%, rgba(0, 229, 255, 0.08), transparent 32rem),
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-dark) 100%);
  background-attachment: fixed;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  padding-top: var(--header-h);
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

address {
  font-style: normal;
}

[hidden] {
  display: none !important;
}

[data-year] {
  font-variant-numeric: tabular-nums;
}

::selection {
  background: rgba(164, 75, 255, 0.5);
  color: var(--c-white);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: 8px;
}

#main-content {
  width: 100%;
  flex: 1 0 auto;
  scroll-margin-top: 96px;
}

.skip-link {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 300;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--c-dark);
  color: var(--c-white);
  border: 1px solid var(--c-cyan);
  font-weight: 700;
  font-size: 0.9rem;
  transform: translateY(-220%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(5, 7, 15, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(0, 229, 255, 0.14);
  display: flex;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 15% 0%, rgba(164, 75, 255, 0.2), transparent 42%),
    radial-gradient(circle at 95% 100%, rgba(0, 229, 255, 0.1), transparent 40%);
}

.site-header__rail {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: var(--header-h);
  padding: 0 16px;
  flex-shrink: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--c-cyan) 0%, var(--c-purple) 55%, var(--c-orange) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand__bolt {
  width: 13px;
  height: 20px;
  background: var(--c-green);
  clip-path: polygon(62% 0, 100% 0, 42% 100%, 20% 55%, 58% 55%);
  filter: drop-shadow(0 0 7px rgba(57, 255, 136, 0.85));
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.12em;
  color: var(--c-text);
  white-space: nowrap;
}

.brand__meta {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--c-text-dim);
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(147, 168, 199, 0.2);
  background: rgba(26, 35, 64, 0.45);
  color: var(--c-text);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.06em;
}

.nav-toggle__label {
  color: var(--c-text-dim);
}

.nav-toggle__box {
  position: relative;
  width: 20px;
  height: 14px;
}

.nav-toggle__box span {
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-green);
  transition: transform 0.28s ease, opacity 0.2s ease, top 0.28s ease;
}

.nav-toggle__box span:nth-child(1) {
  top: 0;
}

.nav-toggle__box span:nth-child(2) {
  top: 6px;
}

.nav-toggle__box span:nth-child(3) {
  top: 12px;
}

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

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

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

.site-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  padding: 14px 16px 22px;
  background: rgba(5, 7, 15, 0.97);
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
}

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

.site-nav__list {
  display: grid;
  gap: 6px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 46px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--c-text-dim);
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: background 0.24s ease, border-color 0.24s ease, color 0.24s ease, transform 0.24s ease;
}

@media (hover: hover) {
  .site-nav__link:hover {
    background: rgba(164, 75, 255, 0.12);
    border-color: rgba(164, 75, 255, 0.34);
    color: var(--c-white);
    transform: translateX(4px);
  }
}

.site-nav__link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.16), rgba(164, 75, 255, 0.12));
  border-color: rgba(0, 229, 255, 0.38);
  color: var(--c-cyan);
  box-shadow: inset 3px 0 0 var(--c-cyan);
}

.site-nav__link[aria-current="page"]::after {
  content: "//";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--c-orange);
  opacity: 0.9;
}

.site-header__bottom {
  display: none;
}

.site-header__cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 13px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--c-purple), #5B24C7);
  color: var(--c-white);
  font-weight: 800;
  letter-spacing: 0.06em;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 10px 26px rgba(164, 75, 255, 0.34);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

@media (hover: hover) {
  .site-header__cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 36px rgba(164, 75, 255, 0.5);
  }
}

.site-header__cta:active {
  transform: scale(0.98);
}

.site-header__cta-arrow {
  font-family: var(--font-data);
  font-size: 1.1rem;
}

.site-header__status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid rgba(147, 168, 199, 0.16);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-text-dim);
  text-transform: uppercase;
}

.site-header__status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 12px rgba(57, 255, 136, 0.9);
  animation: im-pulse 1.7s ease-in-out infinite;
}

.site-header__status-time {
  color: var(--c-green);
}

.site-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  z-index: 3;
}

.site-header__progress span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-purple), var(--c-orange));
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
}

.site-footer {
  position: relative;
  flex-shrink: 0;
  margin-top: auto;
  overflow: hidden;
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-dark) 100%);
  border-top: 1px solid rgba(164, 75, 255, 0.24);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), var(--c-purple), var(--c-orange), transparent);
}

.site-footer__inner {
  width: calc(100% - 48px);
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 56px 0 24px;
}

.site-footer__grid {
  display: grid;
  gap: 40px;
}

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

.site-footer .brand {
  margin-bottom: 20px;
}

.brand--footer .brand__mark {
  font-size: 2.4rem;
}

.brand--footer .brand__name {
  font-size: 0.95rem;
}

.site-footer__tagline {
  max-width: 30ch;
  margin-bottom: 22px;
  color: var(--c-text-dim);
  font-size: 0.95rem;
}

.site-footer__trust {
  border-left: 2px solid var(--c-green);
  padding-left: 14px;
  color: var(--c-green);
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.site-footer__title {
  font-family: var(--font-head);
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--c-text);
  margin-bottom: 18px;
}

.site-footer__nav ul,
.site-footer__legal ul,
.site-footer__contact ul {
  display: grid;
  gap: 10px;
}

.site-footer__nav a,
.site-footer__legal a {
  color: var(--c-text-dim);
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

@media (hover: hover) {
  .site-footer__nav a:hover,
  .site-footer__legal a:hover {
    color: var(--c-cyan);
    padding-left: 4px;
  }
}

.site-footer__contact li {
  color: var(--c-text-dim);
  font-size: 0.9rem;
  line-height: 1.5;
  word-break: break-word;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid rgba(147, 168, 199, 0.16);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--c-text-dim);
}

@keyframes im-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.55;
    transform: scale(0.82);
  }
}

.container {
  width: min(calc(100% - 48px), var(--container-w));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-section);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 38px;
}

.section-head__note {
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
}

.eyebrow {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 12px;
}

.display-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.section-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  line-height: 1.25;
  color: var(--c-text);
}

.chapter-number {
  font-family: var(--font-data);
  font-size: clamp(4rem, 8vw, 7rem);
  line-height: 0.8;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0, 229, 255, 0.42);
}

.page-head {
  max-width: 860px;
  margin: clamp(2rem, 6vw, 5rem) auto clamp(2rem, 5vw, 4rem);
  text-align: center;
}

.page-head__description {
  margin-top: 18px;
  color: var(--c-text-dim);
  font-size: 1.05rem;
}

.glass-card {
  position: relative;
  border-radius: var(--radius-card);
  border: 1px solid rgba(147, 168, 199, 0.16);
  background: linear-gradient(145deg, rgba(26, 35, 64, 0.72), rgba(26, 35, 64, 0.42));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: clamp(20px, 4vw, 32px);
  box-shadow: 0 24px 48px rgba(5, 7, 15, 0.35);
}

.data-panel {
  font-family: var(--font-data);
}

.data-panel__label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}

.data-panel__value {
  display: block;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.1;
  color: var(--c-green);
  text-shadow: 0 0 18px rgba(57, 255, 136, 0.25);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

@media (hover: hover) {
  .button:hover {
    transform: translateY(-2px);
  }
}

.button:active {
  transform: translateY(0) scale(0.98);
}

.button--primary {
  background: linear-gradient(135deg, var(--c-purple), #5B24C7);
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 12px 30px rgba(164, 75, 255, 0.35);
}

@media (hover: hover) {
  .button--primary:hover {
    box-shadow: 0 16px 38px rgba(164, 75, 255, 0.5);
  }
}

.button--ghost {
  background: rgba(26, 35, 64, 0.45);
  border-color: rgba(0, 229, 255, 0.35);
  color: var(--c-cyan);
}

@media (hover: hover) {
  .button--ghost:hover {
    background: rgba(0, 229, 255, 0.12);
  }
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: max-content;
  max-width: 100%;
  padding: 6px;
  border-radius: 999px;
  background: rgba(5, 7, 15, 0.38);
  border: 1px solid rgba(147, 168, 199, 0.18);
}

.topic-filter {
  min-height: 42px;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--c-text-dim);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

@media (hover: hover) {
  .topic-filter:hover {
    background: rgba(164, 75, 255, 0.1);
    border-color: rgba(164, 75, 255, 0.3);
    color: var(--c-text);
  }
}

.topic-filter[aria-pressed="true"],
.topic-filter.is-active {
  color: var(--c-cyan);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.16), rgba(164, 75, 255, 0.14));
  border-color: rgba(0, 229, 255, 0.55);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.15);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(147, 168, 199, 0.25);
  background: rgba(5, 7, 15, 0.3);
  color: var(--c-text-dim);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.status-pill--live {
  color: var(--c-orange);
  border-color: rgba(255, 140, 66, 0.45);
  background: rgba(255, 140, 66, 0.12);
}

.status-pill--live::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 10px var(--c-orange);
}

.status-pill--neutral::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-purple);
  box-shadow: 0 0 10px rgba(164, 75, 255, 0.7);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 0 28px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--c-text-dim);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "//";
  color: var(--c-purple);
}

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

.breadcrumb [aria-current] {
  color: var(--c-green);
}

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

.topic-grid {
  display: grid;
  gap: 20px;
}

.image-shell {
  position: relative;
  overflow: hidden;
  min-height: 120px;
  border-radius: 18px;
  border: 1px solid rgba(147, 168, 199, 0.16);
  background: linear-gradient(145deg, rgba(26, 35, 64, 0.7), rgba(5, 7, 15, 0.9));
}

.image-shell::before {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
  color: rgba(230, 240, 255, 0.45);
}

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

.image-shell--ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.image-shell--ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.image-shell--ratio-square {
  aspect-ratio: 1 / 1;
}

.prose {
  max-width: 72ch;
  color: var(--c-text-dim);
}

.prose p {
  margin-bottom: 1.4em;
}

.prose h2,
.prose h3 {
  font-family: var(--font-head);
  color: var(--c-text);
  margin: 2em 0 0.75em;
}

.prose a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

@media (min-width: 720px) {
  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .content-grid {
    grid-template-columns: repeat(12, 1fr);
  }

  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 44px;
  }
}

@media (min-width: 1024px) {
  body {
    padding-top: 0;
    padding-left: var(--header-w);
  }

  #main-content {
    scroll-margin-top: 24px;
  }

  .site-header {
    inset: 0 auto 0 0;
    width: var(--header-w);
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid rgba(164, 75, 255, 0.24);
  }

  .site-header__rail {
    flex-direction: column;
    padding: 30px 20px 18px;
  }

  .site-header__bar {
    display: block;
    height: auto;
    padding: 0;
    margin-bottom: 42px;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
    position: static;
    max-height: none;
    overflow: visible;
    padding: 0;
    background: transparent;
    border-bottom: 0;
  }

  .site-nav__list {
    padding: 20px 0;
    border-top: 1px solid rgba(147, 168, 199, 0.14);
    border-bottom: 1px solid rgba(147, 168, 199, 0.14);
  }

  .site-header__bottom {
    display: grid;
    gap: 18px;
    margin-top: auto;
  }

  .site-header__cta {
    width: 100%;
  }

  .site-footer__grid {
    grid-template-columns: 1.35fr 1fr 1fr 1.2fr;
    gap: 56px;
  }
}

@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;
  }

  .site-header__status-dot,
  .nav-toggle__box span {
    animation: none;
    transition: none;
  }
}