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

:root {
  --j-blue: #0A6EBD;
  --j-blue-dark: #084A8A;
  --j-orange: #FF6B35;
  --j-bg: #12161C;
  --j-card: #1C222B;
  --j-text: #E8ECF1;
  --j-muted: #9AA7B4;
  --j-border: #2D3741;
  --j-red: #E33A48;
  --j-green: #2BB673;
  --j-font-display: "Arial Black", "Noto Sans SC Black", "Source Han Sans CN", "PingFang SC", sans-serif;
  --j-font-body: "Noto Sans SC", "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", sans-serif;
  --j-font-mono: "Roboto Mono", "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --rail-w: clamp(5.5rem, 12vw, 12rem);
  --header-h: 60px;
  --content-max: 76rem;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--j-font-body);
  font-size: 1rem;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: var(--j-text);
  background: var(--j-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(45, 55, 65, 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(45, 55, 65, 0.35) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--j-font-display);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--j-text);
}

p {
  margin-bottom: var(--space-sm);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--j-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--j-orange);
}

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

:focus-visible {
  outline: 2px solid var(--j-orange);
  outline-offset: 2px;
}

@keyframes jy-pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.35;
  }
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--j-orange);
  color: #12161C;
  padding: 8px 20px;
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
  z-index: 1000;
  pointer-events: auto;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 8px;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--j-orange);
  z-index: 900;
  pointer-events: none;
  transition: width 0.2s ease;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 500;
  pointer-events: none;
}

.brand-track {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--rail-w);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-sm);
  background: var(--j-bg);
  border-right: 1px solid var(--j-border);
  pointer-events: auto;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  align-items: flex-start;
  text-decoration: none;
  width: 100%;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--j-blue);
  color: var(--j-text);
  font-family: var(--j-font-display);
  font-weight: 900;
  font-size: 1.5rem;
  line-height: 1.2;
  padding: 6px 10px;
  letter-spacing: 0.04em;
}

.brand-label {
  font-family: var(--j-font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.3em;
  color: var(--j-muted);
  white-space: nowrap;
  writing-mode: vertical-rl;
  align-self: center;
  margin-top: var(--space-sm);
}

.brand::after {
  content: "";
  align-self: center;
  display: block;
  width: 1px;
  height: 48px;
  margin-top: var(--space-sm);
  background: linear-gradient(to bottom, var(--j-orange), rgba(255, 107, 53, 0));
}

.brand-chapter {
  font-family: var(--j-font-mono);
  font-size: 0.875rem;
  color: var(--j-muted);
  border: 1px solid var(--j-border);
  padding: 6px 8px;
  text-align: center;
  align-self: stretch;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.brand-chapter::before {
  content: "章节";
  display: block;
  font-family: var(--j-font-body);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--j-muted);
  margin-bottom: 2px;
}

.nav-track {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--rail-w);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-sm);
  background: var(--j-bg);
  border-left: 1px solid var(--j-border);
  pointer-events: auto;
}

.site-nav {
  flex: 0 0 auto;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 0 10px 12px;
  border-left: 2px solid var(--j-border);
  text-decoration: none;
  color: var(--j-muted);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--j-text);
  border-left-color: var(--j-blue);
}

.nav-link[aria-current="page"] {
  color: var(--j-text);
  border-left-color: var(--j-orange);
}

.nav-index {
  font-family: var(--j-font-mono);
  font-size: 0.6875rem;
  color: var(--j-muted);
  opacity: 0.6;
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--j-orange);
  opacity: 1;
}

.nav-text {
  display: inline-block;
  font-weight: 500;
}

.nav-live {
  position: absolute;
  bottom: var(--space-sm);
  left: var(--space-sm);
  right: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border: 1px solid var(--j-border);
  background: var(--j-card);
  text-decoration: none;
  font-size: 0.75rem;
  line-height: 1.4;
  transition: border-color 0.2s ease;
}

.nav-live:hover {
  border-color: var(--j-blue);
}

.nav-live-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--j-red);
  animation: jy-pulse 1.8s ease-in-out infinite;
}

.nav-live-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--j-muted);
  white-space: nowrap;
}

.nav-live-time {
  font-family: var(--j-font-mono);
  font-size: 0.6875rem;
  color: var(--j-orange);
  margin-left: auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--j-border);
  padding: 8px 12px;
  color: var(--j-text);
  font-family: var(--j-font-body);
  font-size: 0.875rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.toggle-bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--j-text);
}

.site-main {
  margin-left: var(--rail-w);
  margin-right: var(--rail-w);
  min-height: 60vh;
  padding: var(--space-xl) var(--space-md);
}

.container {
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-sm);
  padding-right: var(--space-sm);
}

[data-chapter] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.section {
  padding: var(--space-xl) 0;
}

.section + .section {
  border-top: 1px solid var(--j-border);
}

.section-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.section-title {
  font-family: var(--j-font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--j-text);
  margin-bottom: var(--space-sm);
}

.section-title::before {
  content: attr(data-index);
  display: block;
  font-family: var(--j-font-mono);
  font-weight: 400;
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: var(--j-orange);
  margin-bottom: 4px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  background: var(--j-card);
  border: 1px solid var(--j-border);
  padding: var(--space-md);
}

.card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xs);
  border-bottom: 1px solid var(--j-border);
  padding-bottom: var(--space-xs);
}

.card-title {
  font-family: var(--j-font-display);
  font-weight: 900;
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--j-text);
  margin-bottom: 0;
}

.card-title--mono {
  font-family: var(--j-font-mono);
  font-weight: 700;
  letter-spacing: 0;
}

.card-meta {
  font-family: var(--j-font-mono);
  font-size: 0.75rem;
  color: var(--j-muted);
}

.card-body {
  font-size: 0.9375rem;
  color: var(--j-muted);
  line-height: 1.7;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 4px 10px;
  border: 1px solid var(--j-border);
  color: var(--j-muted);
  background: transparent;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a.tag {
  cursor: pointer;
}

.tag:hover {
  color: var(--j-text);
  border-color: var(--j-muted);
}

.tag--blue {
  border-color: var(--j-blue);
  color: var(--j-blue);
}

.tag--orange {
  border-color: var(--j-orange);
  color: var(--j-orange);
}

.tag--green {
  border-color: var(--j-green);
  color: var(--j-green);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--j-blue);
  background: transparent;
  color: var(--j-blue);
  font-family: var(--j-font-body);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  background: var(--j-blue);
  color: var(--j-text);
}

.btn:active {
  background: var(--j-blue-dark);
  border-color: var(--j-blue-dark);
}

.btn--primary {
  background: var(--j-blue);
  color: var(--j-text);
  border-color: var(--j-blue);
}

.btn--primary:hover {
  background: var(--j-blue-dark);
  border-color: var(--j-blue-dark);
}

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

.btn--ghost:hover {
  background: var(--j-card);
  border-color: var(--j-blue);
  color: var(--j-text);
}

.btn--orange {
  background: var(--j-orange);
  border-color: var(--j-orange);
  color: #12161C;
}

.btn--orange:hover {
  background: #e85a26;
  border-color: #e85a26;
  color: #12161C;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--j-muted);
  margin-bottom: var(--space-md);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  color: var(--j-muted);
  text-decoration: none;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--j-border);
}

a.breadcrumb-item,
.breadcrumb-item a {
  color: var(--j-blue);
}

a.breadcrumb-item:hover,
.breadcrumb-item a:hover {
  color: var(--j-orange);
}

.breadcrumb-item--active {
  color: var(--j-text);
}

.grid {
  display: grid;
  gap: var(--space-md);
}

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

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

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

.media {
  position: relative;
  aspect-ratio: 16 / 9;
  background-color: var(--j-card);
  background-image: linear-gradient(135deg, transparent 49.5%, var(--j-border) 49.5%, var(--j-border) 50.5%, transparent 50.5%);
  border: 1px solid var(--j-border);
  overflow: hidden;
}

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

.media--3-2 {
  aspect-ratio: 3 / 2;
}

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

.media::before {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--j-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--j-muted);
}

.media > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.score {
  font-family: var(--j-font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--j-orange);
  font-variant-numeric: tabular-nums;
}

.site-footer {
  position: relative;
  margin-left: var(--rail-w);
  margin-right: var(--rail-w);
  background: #0D1117;
  border-top: 1px solid var(--j-border);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--j-blue), var(--j-orange));
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-sm) var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: flex-start;
}

.footer-mark {
  font-family: var(--j-font-display);
  font-weight: 900;
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--j-text);
  border-left: 3px solid var(--j-orange);
  padding-left: 10px;
}

.footer-desc {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--j-muted);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  align-items: flex-start;
}

.footer-title {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--j-text);
  border-bottom: 1px solid var(--j-border);
  padding-bottom: 6px;
  margin-bottom: var(--space-xs);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--j-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link::before {
  content: "→";
  font-family: var(--j-font-mono);
  font-size: 0.625rem;
  color: var(--j-blue);
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-link:hover {
  color: var(--j-text);
}

.footer-link:hover::before {
  color: var(--j-orange);
  transform: translateX(3px);
}

.footer-feedback {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: flex-start;
}

.feedback-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--j-font-body);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--j-blue);
  border: 1px solid var(--j-blue);
  padding: 8px 16px;
  text-decoration: none;
  background: transparent;
  transition: background 0.2s ease, color 0.2s ease;
}

.feedback-btn:hover {
  background: var(--j-blue);
  color: var(--j-text);
}

.feedback-note {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--j-muted);
  max-width: 20em;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-md);
  border-top: 1px solid var(--j-border);
  border-bottom: 1px solid var(--j-border);
  padding: var(--space-sm) 0;
  margin-bottom: var(--space-md);
}

.footer-contact-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--j-muted);
}

.footer-contact-item::before {
  content: "▸";
  font-family: var(--j-font-mono);
  font-size: 0.625rem;
  color: var(--j-blue);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xs) var(--space-md);
  font-size: 0.75rem;
  color: var(--j-muted);
}

@media (max-width: 899px) {
  .site-header {
    height: var(--header-h);
    background: var(--j-bg);
    border-bottom: 1px solid var(--j-border);
    pointer-events: auto;
  }

  .reading-progress {
    top: 0;
    left: 0;
  }

  .brand-track {
    width: auto;
    height: var(--header-h);
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-xs);
    padding: 0 0 0 var(--space-sm);
    border-right: 0;
  }

  .brand {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xs);
  }

  .brand-mark {
    font-size: 1.125rem;
    padding: 4px 8px;
  }

  .brand-label {
    display: none;
  }

  .brand::after {
    display: none;
  }

  .brand-chapter {
    display: none;
  }

  .nav-track {
    width: auto;
    height: var(--header-h);
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-xs);
    padding: 0 var(--space-sm) 0 0;
    border-left: 0;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--j-bg);
    border-top: 1px solid var(--j-border);
    padding: var(--space-lg);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    z-index: 350;
  }

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

  .nav-list {
    gap: 2px;
    max-width: 36rem;
    margin: 0 auto;
  }

  .nav-link {
    padding: 14px 12px;
    font-size: 1rem;
    border-left-width: 3px;
  }

  .nav-live {
    display: none;
  }

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

  .site-main {
    margin-left: 0;
    margin-right: 0;
    padding: calc(var(--header-h) + var(--space-lg)) var(--space-md) var(--space-xl);
  }

  .site-footer {
    margin-left: 0;
    margin-right: 0;
    padding-bottom: calc(env(safe-area-inset-bottom, 0px));
  }

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

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

@media (max-width: 640px) {
  .site-main {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

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

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

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

  html {
    scroll-behavior: auto !important;
  }

  .nav-live-dot {
    animation: none;
  }
}

html[data-motion="reduce"] *,
html[data-motion="reduce"] *::before,
html[data-motion="reduce"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}