:root {
  --color-primary: #0A1128;
  --color-accent: #7B2FFF;
  --color-neon: #39FF14;
  --color-text: #F2EFE9;
  --color-muted: #8A8D91;
  --color-success: #6B8E23;
  --color-warning: #D2691E;
  --color-surface: #12151C;
  --color-border: rgba(242, 239, 233, 0.12);
  --gradient-primary: linear-gradient(120deg, #7B2FFF 0%, #39FF14 100%);
  --font-headline: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container: 1280px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--color-primary);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-headline);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-text);
}

p {
  margin: 0 0 1.1em;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

[hidden] {
  display: none !important;
}

::selection {
  background: var(--color-accent);
  color: #fff;
}

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

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

/* ============ 通用布局 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  position: relative;
  padding: clamp(64px, 10vw, 128px) 0;
}

.section__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-neon);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.section-label::before {
  content: "//";
  color: var(--color-accent);
  letter-spacing: 0;
}

.section-title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-sub {
  color: var(--color-muted);
  font-size: clamp(0.9375rem, 1.2vw, 1.0625rem);
  max-width: 60ch;
}

.page-hero {
  position: relative;
  padding: clamp(88px, 12vw, 150px) 0;
  overflow: hidden;
}

.page-hero__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.page-hero__title {
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  line-height: 1.08;
  margin: 0 0 24px;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-hero__lead {
  color: var(--color-muted);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  max-width: 56ch;
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.main-content {
  position: relative;
  z-index: 1;
  min-height: 60vh;
}

.split {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.split--flip {
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
}

.split > * {
  min-width: 0;
}

@media (max-width: 900px) {
  .split,
  .split--flip {
    grid-template-columns: 1fr;
  }
}

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

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

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

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

.grid--gap-lg {
  gap: 40px;
}

.grid--asym {
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
}

@media (max-width: 1024px) {
  .grid--cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--cols-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--asym {
    grid-template-columns: 1fr;
  }
}

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

/* ============ 头部 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  padding: 14px clamp(16px, 3vw, 32px) 0;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px 10px 8px 16px;
  border-radius: 999px;
  background: rgba(10, 17, 40, 0.82);
  border: 1px solid rgba(123, 47, 255, 0.35);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(242, 239, 233, 0.06);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  pointer-events: auto;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 300;
  background: var(--gradient-primary);
  box-shadow: 0 0 12px rgba(123, 47, 255, 0.5);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 20px;
  z-index: 1000;
  padding: 10px 20px;
  background: var(--color-neon);
  color: var(--color-primary);
  font-family: var(--font-data);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 999px;
  box-shadow: 0 0 24px rgba(57, 255, 20, 0.4);
  transform: translateY(-250%);
  transition: transform 0.25s ease;
  pointer-events: auto;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--color-primary);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  flex-shrink: 0;
}

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

.site-brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(123, 47, 255, 0.9), rgba(123, 47, 255, 0.4));
  border: 1px solid rgba(123, 47, 255, 0.6);
  box-shadow: 0 0 20px rgba(123, 47, 255, 0.25), inset 0 0 12px rgba(123, 47, 255, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.site-brand__mark::before {
  content: "P";
  font-family: var(--font-data);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

.site-brand__mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(242, 239, 233, 0.35);
  border-radius: 8px;
  transform: skewX(-12deg);
}

.site-brand__mark-dot {
  position: absolute;
  top: -3px;
  right: -3px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-neon);
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 10px var(--color-neon);
}

.site-brand:hover .site-brand__mark {
  transform: rotate(-3deg);
  box-shadow: 0 0 28px rgba(123, 47, 255, 0.45), inset 0 0 16px rgba(123, 47, 255, 0.3);
}

.site-brand__name {
  display: block;
  font-family: var(--font-headline);
  font-size: 1.0625rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--color-text);
  white-space: nowrap;
}

.site-brand__sub {
  display: block;
  font-family: var(--font-data);
  font-size: 0.625rem;
  line-height: 1.2;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-muted);
  white-space: nowrap;
}

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

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  display: block;
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav__link:hover {
  background: rgba(123, 47, 255, 0.15);
  color: #fff;
}

.site-nav__link[aria-current="page"] {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 18px rgba(123, 47, 255, 0.35);
}

.site-header__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding-right: 8px;
  color: var(--color-muted);
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid rgba(123, 47, 255, 0.4);
  background: rgba(123, 47, 255, 0.15);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.site-nav-toggle:hover {
  border-color: var(--color-accent);
  background: rgba(123, 47, 255, 0.25);
  box-shadow: 0 0 16px rgba(123, 47, 255, 0.25);
}

.site-nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

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

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

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1199px) {
  .site-header__status {
    display: none;
  }
}

@media (max-width: 1024px) {
  .site-header {
    padding-top: 12px;
  }

  .site-header__inner {
    padding: 8px 12px 8px 14px;
  }

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

  .js .site-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    padding: 14px;
    background: rgba(18, 21, 28, 0.98);
    border: 1px solid rgba(123, 47, 255, 0.35);
    border-radius: 24px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    pointer-events: none;
  }

  .js .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

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

  .js .site-nav__link {
    padding: 13px 16px;
    border-radius: 14px;
    font-size: 1rem;
  }
}

@media (max-width: 640px) {
  .site-brand__sub {
    display: none;
  }

  .site-brand__name {
    font-size: 1rem;
  }

  .site-header__inner {
    padding: 6px 10px 6px 12px;
  }
}

/* ============ 页脚 ============ */
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: clamp(64px, 8vw, 120px);
  padding-top: clamp(48px, 6vw, 80px);
  background:
    radial-gradient(ellipse 70% 100% at 90% 100%, rgba(123, 47, 255, 0.14), transparent 60%),
    linear-gradient(180deg, rgba(18, 21, 28, 0.5), var(--color-primary) 60%);
  border-top: 1px solid rgba(123, 47, 255, 0.3);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-accent) 30%, var(--color-neon) 70%, transparent 100%);
  opacity: 0.8;
}

.site-footer::after {
  content: "";
  position: absolute;
  right: -160px;
  bottom: -200px;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 47, 255, 0.12), transparent 65%);
  pointer-events: none;
}

.site-footer__grid {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px clamp(32px, 5vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr) minmax(0, 0.8fr) minmax(0, 1.1fr);
  gap: clamp(24px, 4vw, 48px);
}

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

.site-brand--footer .site-brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.site-brand--footer .site-brand__mark::before {
  font-size: 14px;
}

.site-footer__slogan {
  margin: 0 0 8px;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.site-footer__trust {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.site-footer__trust::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-neon);
  box-shadow: 0 0 10px var(--color-neon);
  flex-shrink: 0;
}

.site-footer__heading {
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(242, 239, 233, 0.1);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-neon);
}

.site-footer__links {
  display: grid;
  gap: 10px;
}

.site-footer__links a {
  color: var(--color-muted);
  font-size: 0.9rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__links a:hover {
  color: var(--color-text);
  padding-left: 6px;
}

.site-footer__contact {
  display: grid;
  gap: 14px;
}

.site-footer__contact-item {
  display: grid;
  gap: 2px;
}

.site-footer__contact-label {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
}

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

.site-footer__bottom {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px 24px 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  border-top: 1px solid rgba(242, 239, 233, 0.08);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

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

@media (max-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

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

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

.btn--primary {
  background: linear-gradient(120deg, var(--color-accent), #9b5cff);
  color: #fff;
  box-shadow: 0 8px 24px rgba(123, 47, 255, 0.35);
}

.btn--primary:hover {
  color: #fff;
  box-shadow: 0 12px 32px rgba(123, 47, 255, 0.5);
}

.btn--neon {
  background: var(--color-neon);
  color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(57, 255, 20, 0.3);
}

.btn--neon:hover {
  color: var(--color-primary);
  box-shadow: 0 12px 28px rgba(57, 255, 20, 0.45);
}

.btn--outline {
  background: transparent;
  border-color: rgba(123, 47, 255, 0.6);
  color: var(--color-text);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  background: rgba(123, 47, 255, 0.12);
  color: #fff;
}

.btn--ghost {
  background: rgba(242, 239, 233, 0.05);
  border-color: rgba(242, 239, 233, 0.15);
  color: var(--color-text);
}

.btn--ghost:hover {
  background: rgba(242, 239, 233, 0.1);
  border-color: rgba(242, 239, 233, 0.3);
  color: #fff;
}

.btn--sm {
  padding: 8px 16px;
  font-size: 0.8125rem;
}

.btn--lg {
  padding: 16px 32px;
  font-size: 1.0625rem;
}

.btn--arrow::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-data);
  transition: transform 0.25s ease;
}

.btn--arrow:hover::after {
  transform: translateX(4px);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  margin-bottom: 32px;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(242, 239, 233, 0.25);
}

.breadcrumb__link {
  color: var(--color-muted);
  transition: color 0.2s ease;
}

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

.breadcrumb__item[aria-current="page"] {
  color: var(--color-text);
  font-weight: 700;
}

/* ============ 卡片 ============ */
.card {
  position: relative;
  overflow: hidden;
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid rgba(242, 239, 233, 0.08);
  border-radius: var(--radius-lg);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(123, 47, 255, 0.5);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.4);
}

.card--accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
}

/* ============ 数据面板 ============ */
.monitor {
  position: relative;
  overflow: hidden;
  padding: 28px;
  background: linear-gradient(160deg, rgba(18, 21, 28, 0.95), rgba(10, 17, 40, 0.85));
  border: 1px solid rgba(123, 47, 255, 0.3);
  border-radius: var(--radius-lg);
  font-family: var(--font-data);
}

.monitor::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, transparent 0 2px, rgba(57, 255, 20, 0.025) 2px 4px);
  pointer-events: none;
}

.metric__label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.metric__value {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-neon);
  text-shadow: 0 0 20px rgba(57, 255, 20, 0.3);
}

/* ============ 标签 ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-text);
  background: rgba(123, 47, 255, 0.1);
  border: 1px solid rgba(123, 47, 255, 0.4);
}

.tag--neon {
  color: var(--color-neon);
  background: rgba(57, 255, 20, 0.08);
  border-color: rgba(57, 255, 20, 0.4);
}

.tag--success {
  color: var(--color-success);
  background: rgba(107, 142, 35, 0.1);
  border-color: rgba(107, 142, 35, 0.45);
}

.tag--warning {
  color: var(--color-warning);
  background: rgba(210, 105, 30, 0.1);
  border-color: rgba(210, 105, 30, 0.45);
}

/* ============ 状态点 ============ */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot--live {
  background: var(--color-neon);
  box-shadow: 0 0 10px var(--color-neon);
  animation: status-pulse 2s ease-out infinite;
}

/* ============ 章节编号 ============ */
.chapter {
  display: grid;
  grid-template-columns: clamp(64px, 10vw, 120px) 1fr;
  gap: clamp(20px, 4vw, 40px);
  padding: 32px 0;
  border-bottom: 1px solid rgba(242, 239, 233, 0.1);
}

.chapter__num {
  font-family: var(--font-data);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 0.9;
  color: rgba(123, 47, 255, 0.4);
  user-select: none;
}

@supports (-webkit-text-stroke: 1px black) {
  .chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--color-accent);
  }
}

.chapter__title {
  margin: 0 0 8px;
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

.chapter__body {
  color: var(--color-muted);
}

/* ============ 标签页 ============ */
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 6px;
  background: rgba(18, 21, 28, 0.85);
  border: 1px solid rgba(242, 239, 233, 0.1);
  border-radius: 999px;
}

.tab-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--color-muted);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  padding: 10px 20px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.tab-btn:hover {
  color: var(--color-text);
  background: rgba(123, 47, 255, 0.12);
}

.tab-btn[aria-selected="true"] {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(123, 47, 255, 0.35);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
  animation: tab-in 0.35s ease both;
}

/* ============ 图片容器 ============ */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid rgba(123, 47, 255, 0.25);
  aspect-ratio: 16 / 10;
}

.media--wide {
  aspect-ratio: 21 / 9;
}

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

.media--square {
  aspect-ratio: 1 / 1;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.media:hover img {
  transform: scale(1.03);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(242, 239, 233, 0.08);
  pointer-events: none;
}

.media__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  text-align: center;
  color: var(--color-muted);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(123, 47, 255, 0.16), transparent 55%),
    linear-gradient(135deg, rgba(123, 47, 255, 0.06), rgba(57, 255, 20, 0.04));
}

.media--hologram::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(115deg, transparent 30%, rgba(57, 255, 20, 0.09) 50%, transparent 70%);
  background-size: 220% 100%;
  animation: holo-sweep 6s linear infinite;
  pointer-events: none;
}

/* ============ 装饰与工具 ============ */
.holo-grid {
  position: relative;
}

.holo-grid::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(123, 47, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123, 47, 255, 0.08) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, black, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, black, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.diag-line {
  width: 100%;
  height: 3px;
  border-radius: 3px;
  background: var(--gradient-primary);
  box-shadow: 0 0 16px rgba(123, 47, 255, 0.4);
  transform: skewX(-18deg);
}

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

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

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ============ 返回顶部 ============ */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 300;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 50%;
  border: 1px solid rgba(57, 255, 20, 0.5);
  background: rgba(10, 17, 40, 0.88);
  color: var(--color-neon);
  font-family: var(--font-data);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 0 24px rgba(10, 17, 40, 0.6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background 0.3s ease, border-color 0.3s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* ============ 滚动显现 ============ */
.js [data-reveal] {
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.js [data-reveal]:not(.is-revealed) {
  opacity: 0;
  transform: translateY(28px);
}

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

/* ============ 动画 ============ */
@keyframes status-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5), 0 0 12px var(--color-neon);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(57, 255, 20, 0), 0 0 12px var(--color-neon);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0), 0 0 12px var(--color-neon);
  }
}

@keyframes holo-sweep {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

@keyframes tab-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ============ 响应式微调 ============ */
@media (max-width: 640px) {
  .section {
    padding: 56px 0;
  }

  .page-hero {
    padding: 72px 0;
  }
}

/* ============ 动效偏好 ============ */
@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;
  }

  .js [data-reveal]:not(.is-revealed),
  .js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}