/* /assets/site.css */
:root {
  --color-ink: #0B1B2B;
  --color-paper: #F4F1E8;
  --color-yellow: #D7FF3E;
  --color-red: #D92C2C;
  --color-silver: #A8B2BC;
  --color-crimson: #7A1E1E;
  --color-mist: #3A414A;
  --color-line: rgba(168, 178, 188, 0.35);
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Oswald", "DIN Alternate", "Bahnschrift", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
  -webkit-text-size-adjust: 100%;
}

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

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(168, 178, 188, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 178, 188, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
}

body::after {
  content: "";
  position: fixed;
  inset: -12%;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 42%, rgba(215, 255, 62, 0.05) 48%, rgba(215, 255, 62, 0.14) 50%, rgba(215, 255, 62, 0.05) 52%, transparent 58%);
  animation: speed-sweep 900ms ease-out 120ms both;
}

@keyframes speed-sweep {
  0% {
    opacity: 0;
    transform: translate3d(-3%, 0, 0);
  }
  25% {
    opacity: 0.7;
  }
  100% {
    opacity: 0;
    transform: translate3d(3%, 0, 0);
  }
}

@keyframes header-sweep {
  0% {
    opacity: 0;
    transform: translateX(-100%);
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateX(100%);
  }
}

h1, h2, h3, h4, h5, p, ul, ol, dl, blockquote, figure {
  margin: 0 0 1rem;
  font-weight: 400;
}

h1, h2, h3 {
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(44px, 8vw, 96px);
  font-weight: 700;
}

h2 {
  font-size: clamp(30px, 5vw, 56px);
  font-weight: 700;
}

h3 {
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
}

p {
  line-height: 1.75;
}

ul, ol {
  padding-left: 1.25rem;
}

a {
  color: var(--color-yellow);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

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

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

:focus-visible {
  outline: 3px solid var(--color-yellow);
  outline-offset: 2px;
}

.main-content {
  position: relative;
  z-index: 1;
  display: block;
  min-height: 70vh;
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 48px);
}

.section {
  padding: clamp(56px, 8vw, 104px) 0;
}

.section--paper {
  background: var(--color-paper);
  color: var(--color-ink);
}

.section--paper .chapter-index {
  color: var(--color-ink);
}

.section--paper .chapter-index::before {
  background: var(--color-ink);
}

.chapter-index {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-yellow);
}

.chapter-index::before {
  content: "";
  width: 34px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--color-yellow);
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0 0;
}

.index-card {
  position: relative;
  display: block;
  min-height: 180px;
  padding: 24px;
  overflow: hidden;
  text-decoration: none;
  background: var(--color-paper);
  color: var(--color-ink);
  border: 1px solid var(--color-line);
}

.index-card:hover,
.index-card:focus-visible {
  color: var(--color-ink);
}

.index-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 6px;
  height: 100%;
  background: var(--color-yellow);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.2s ease;
}

.index-card:hover::after,
.index-card:focus-visible::after {
  transform: scaleY(1);
}

.index-card h2,
.index-card h3 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 700;
}

.index-card p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-mist);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  padding: 24px;
  background: var(--color-paper);
  color: var(--color-ink);
  border: 1px solid var(--color-line);
  border-radius: 0;
}

.card--invert {
  background: var(--color-ink);
  color: var(--color-paper);
  border-color: rgba(168, 178, 188, 0.4);
}

.card h3 {
  margin-top: 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--color-line);
  background: transparent;
  color: var(--color-silver);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.4;
}

.tag--accent {
  border-color: var(--color-yellow);
  background: var(--color-yellow);
  color: var(--color-ink);
  font-weight: 600;
}

.tag--alert {
  border-color: var(--color-red);
  background: var(--color-red);
  color: var(--color-paper);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0 0 24px;
  list-style: none;
  color: var(--color-silver);
  font-size: 14px;
}

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

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

.breadcrumb a {
  color: var(--color-yellow);
  text-decoration: none;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-paper);
}

.tab-set {
  margin: 24px 0;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 0 8px;
  margin: 0 0 24px;
  list-style: none;
  border-bottom: 1px solid var(--color-line);
}

.tab-button {
  appearance: none;
  padding: 8px 18px;
  background: transparent;
  color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
}

.tab-button:hover {
  color: var(--color-yellow);
  border-color: var(--color-yellow);
}

.tab-button[aria-selected="true"] {
  background: var(--color-yellow);
  border-color: var(--color-yellow);
  color: var(--color-ink);
  font-weight: 700;
}

.section--paper .tab-button {
  color: var(--color-ink);
  border-color: rgba(11, 27, 43, 0.4);
}

.section--paper .tab-button[aria-selected="true"] {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-paper);
}

.tab-panel {
  display: block;
}

.tab-panel[hidden] {
  display: none !important;
}

.media {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  background: var(--color-mist);
  border: 1px solid var(--color-line);
}

.media--dark {
  background: var(--color-ink);
  border-color: rgba(168, 178, 188, 0.5);
}

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

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(120deg, transparent 20%, rgba(215, 255, 62, 0.12) 50%, transparent 80%);
}

.media-caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 4px 10px;
  margin: 0;
  background: rgba(11, 27, 43, 0.8);
  color: var(--color-paper);
  font-size: 12px;
  line-height: 1.6;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-yellow);
}

.data-table tbody tr:hover {
  background: rgba(168, 178, 188, 0.08);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--color-yellow);
  vertical-align: middle;
  box-shadow: 0 0 0 3px rgba(215, 255, 62, 0.18);
}

.status-dot--alert {
  background: var(--color-red);
  box-shadow: 0 0 0 3px rgba(217, 44, 44, 0.18);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--color-yellow);
  color: var(--color-ink);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transform: translateY(calc(-100% - 24px));
  transition: transform 0.2s ease;
}

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

.site-header {
  position: sticky;
  top: 16px;
  z-index: 100;
  width: 100%;
  margin-bottom: 32px;
  padding: 0 clamp(16px, 4vw, 48px);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  opacity: 0;
  background: linear-gradient(90deg, transparent, var(--color-yellow) 50%, transparent);
  animation: header-sweep 800ms ease-out 80ms both;
}

.header-shell {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 10px 12px 10px 18px;
  background: rgba(11, 27, 43, 0.88);
  border: 1px solid rgba(168, 178, 188, 0.36);
  border-radius: 999px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

.header-shell::after {
  content: "";
  position: absolute;
  inset: 6px 8px;
  border: 1px solid rgba(122, 30, 30, 0.35);
  border-radius: 999px;
  pointer-events: none;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--color-paper);
}

.brand-lockup:hover {
  color: var(--color-paper);
}

.brand-gauge {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
}

.brand-gauge--small {
  width: 34px;
  height: 34px;
}

.brand-text {
  display: grid;
  line-height: 1.15;
}

.brand-cn {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-en {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-silver);
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 9px 13px;
  border-radius: 999px;
  color: var(--color-silver);
  font-size: 14px;
  line-height: 1.2;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-paper);
  background: rgba(58, 65, 74, 0.65);
}

.nav-link[aria-current="page"] {
  background: var(--color-yellow);
  color: var(--color-ink);
  font-weight: 600;
}

.nav-link[aria-current="page"]:hover {
  color: var(--color-ink);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: var(--color-yellow);
  border-color: var(--color-yellow);
  color: var(--color-ink);
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--color-paper);
  border-color: var(--color-paper);
  color: var(--color-ink);
}

.btn-entry {
  box-shadow: 0 0 0 1px rgba(11, 27, 43, 0.25), 0 6px 16px rgba(215, 255, 62, 0.22);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  margin: 0;
  background: transparent;
  color: var(--color-paper);
  border: 1px solid rgba(168, 178, 188, 0.45);
  border-radius: 999px;
  cursor: pointer;
  line-height: 1;
}

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

.nav-toggle[aria-expanded="true"] {
  color: var(--color-yellow);
  border-color: var(--color-yellow);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 5px 0 currentColor;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-toggle-bars::after {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease;
}

.nav-toggle.is-open .nav-toggle-bars::before {
  transform: translateY(5px) rotate(45deg);
  box-shadow: none;
}

.nav-toggle.is-open .nav-toggle-bars::after {
  transform: translateY(-3px) rotate(-45deg);
}

.nav-toggle-label {
  font-size: 13px;
}

.site-footer {
  position: relative;
  z-index: 1;
  margin-top: 72px;
  overflow: hidden;
  background: linear-gradient(180deg, #0B1B2B 0%, #08141F 100%);
  color: var(--color-paper);
  border-top: 1px solid rgba(168, 178, 188, 0.25);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-yellow) 0 30%, var(--color-red) 30% 40%, var(--color-silver) 40% 100%);
}

.footer-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 64px clamp(16px, 4vw, 48px) 32px;
}

.footer-top {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid rgba(168, 178, 188, 0.22);
}

.footer-brand .brand-lockup {
  margin-bottom: 12px;
}

.footer-about {
  max-width: 640px;
  margin: 0;
  color: var(--color-silver);
  font-size: 14px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px 24px;
}

.footer-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-yellow);
}

.footer-list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.footer-list li {
  margin: 4px 0;
}

.footer-link {
  color: var(--color-silver);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

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

.footer-list .footer-link:hover {
  padding-left: 4px;
}

.footer-contact .contact-list {
  margin-bottom: 16px;
}

.contact-list {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.contact-item {
  color: var(--color-silver);
  font-size: 14px;
  line-height: 1.6;
}

.contact-label {
  display: inline-block;
  min-width: 4em;
  margin-right: 8px;
  color: var(--color-yellow);
  font-weight: 600;
}

.footer-support {
  margin: 0;
  padding: 12px 16px;
  background: rgba(58, 65, 74, 0.45);
  border-left: 3px solid var(--color-yellow);
  color: var(--color-silver);
  font-size: 13px;
  line-height: 1.7;
}

.footer-meta {
  display: grid;
  gap: 8px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(168, 178, 188, 0.22);
  color: var(--color-silver);
  font-size: 13px;
}

.legal-note {
  max-width: 980px;
  margin: 0;
}

.copyright {
  margin: 0;
}

.copyright .footer-link {
  font-size: 13px;
}

html.js [data-reveal]:not(.is-inview) {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms ease, transform 600ms ease;
}

html.js [data-reveal].is-inview {
  opacity: 1;
  transform: none;
  transition: opacity 600ms ease, transform 600ms ease;
}

@media (max-width: 960px) {
  .site-header {
    top: 10px;
    padding: 0 12px;
  }

  .header-shell {
    gap: 10px;
    padding: 8px 10px 8px 14px;
    border-radius: 24px;
  }

  .header-shell::after {
    border-radius: 20px;
  }

  .brand-gauge {
    width: 34px;
    height: 34px;
  }

  .brand-en {
    display: none;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: block;
    flex: none;
    padding: 12px;
    margin: 0;
    background: rgba(11, 27, 43, 0.97);
    border: 1px solid rgba(168, 178, 188, 0.35);
    border-radius: 20px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 16px;
  }

  .header-actions {
    margin-left: auto;
  }

  .btn-entry {
    padding: 8px 12px;
    font-size: 13px;
  }

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

@media (max-width: 620px) {
  .footer-cols {
    grid-template-columns: 1fr;
    gap: 28px 0;
  }

  .footer-shell {
    padding-top: 48px;
  }

  .footer-top {
    padding-bottom: 24px;
  }

  .nav-toggle-label {
    display: none;
  }

  .nav-toggle {
    padding: 10px;
  }

  .btn-entry {
    padding: 9px 10px;
    font-size: 12px;
  }

  .brand-cn {
    font-size: 17px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  body::after,
  .site-header::before {
    animation: none;
  }

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