:root {
  --color-bg: #111827;
  --color-paper: #F2EBD9;
  --color-ink: #1A1A1A;
  --color-blue: #1B3B6F;
  --color-purple: #6A0DAD;
  --color-pink: #FF2E93;
  --color-green: #39FF14;
  --color-grid: #D9C79F;
  --color-muted: #5C5C5C;
  --color-panel-dark: #111827;
  --color-panel-light: #F7F3E9;
  --font-title: "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei UI", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-meta: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --container-width: 1200px;
}

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

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

body {
  background: var(--color-bg);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

p, address, h1, h2, h3, h4 {
  margin: 0;
}

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

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

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

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

::selection {
  background: var(--color-pink);
  color: #ffffff;
}

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

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 300;
  padding: 0.75rem 1rem;
  background: var(--color-green);
  color: var(--color-ink);
  font-weight: 700;
  transition: top 0.3s var(--ease-standard);
}

.skip-link:focus {
  top: 1rem;
}

#main-content {
  display: block;
  min-height: 60vh;
  background: var(--color-paper);
  color: var(--color-ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--color-paper);
  background: linear-gradient(100deg, #0d1526 0%, var(--color-blue) 55%, #3c0f5e 100%);
  border-bottom: 1px solid rgba(57, 255, 20, 0.2);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 12rem;
  height: 100%;
  background: repeating-linear-gradient(135deg, rgba(255, 46, 147, 0.12) 0 2px, transparent 2px 12px);
  pointer-events: none;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-green), var(--color-pink), var(--color-purple));
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 50%;
  will-change: transform;
}

.header-inner {
  position: relative;
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 0.7rem clamp(1rem, 3vw, 2rem);
  display: grid;
  grid-template-areas: "brand nav tools";
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 1.5rem 2rem;
}

.brand {
  grid-area: brand;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-title);
}

.brand-glyph {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2rem;
  background: var(--color-green);
  color: var(--color-ink);
  font-weight: 900;
  font-size: 0.95rem;
  letter-spacing: -0.03em;
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}

.brand-word {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--color-paper);
}

.brand-word em {
  font-style: normal;
  color: var(--color-pink);
}

.main-nav[data-nav] {
  grid-area: nav;
  justify-self: center;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  flex-wrap: wrap;
}

.nav-link {
  position: relative;
  display: block;
  padding: 0.5rem 0.75rem;
  color: rgba(242, 235, 217, 0.88);
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
  transition: color 0.3s var(--ease-standard);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.2rem;
  height: 2px;
  background: transparent;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-standard), background-color 0.3s var(--ease-standard);
}

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

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--color-green);
}

.header-tools {
  grid-area: tools;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-search {
  position: relative;
}

.site-search-input {
  display: block;
  width: 12rem;
  padding: 0.5rem 0.75rem;
  background: rgba(17, 24, 39, 0.55);
  border: 1px solid #33456b;
  color: var(--color-paper);
  font-size: 0.875rem;
  border-radius: 0;
  transition: border-color 0.3s var(--ease-standard), box-shadow 0.3s var(--ease-standard);
}

.site-search-input::placeholder {
  color: #8b97a9;
}

.site-search-input:focus {
  outline: none;
  border-color: var(--color-green);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.18);
}

.site-search-input:focus-visible {
  outline: 2px solid var(--color-green);
  outline-offset: 2px;
}

.nav-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  place-content: center;
  grid-template-rows: repeat(3, 2px);
  gap: 5px;
  background: transparent;
  border: 1px solid #33456b;
  cursor: pointer;
  transition: border-color 0.3s var(--ease-standard);
}

.nav-toggle-bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--color-green);
  transition: transform 0.3s var(--ease-standard), opacity 0.3s var(--ease-standard);
}

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

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

@media (max-width: 1200px) {
  .header-inner {
    grid-template-areas: "brand tools";
    grid-template-columns: 1fr auto;
  }

  .main-nav[data-nav] {
    grid-area: nav;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: #0e1523;
    border-top: 1px solid var(--color-purple);
    border-bottom: 2px solid var(--color-purple);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
  }

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

  .site-search {
    display: none;
  }

  .nav-toggle {
    display: grid;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1rem 1rem;
  }

  .nav-link {
    padding: 0.8rem 0.6rem;
    border-bottom: 1px solid rgba(217, 199, 159, 0.12);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link[aria-current="page"] {
    background: rgba(57, 255, 20, 0.08);
    color: var(--color-green);
    box-shadow: inset 3px 0 0 var(--color-green);
  }
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: #0d1523;
  color: var(--color-paper);
  border-top: 3px solid var(--color-purple);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  pointer-events: none;
  background:
    linear-gradient(135deg, transparent 32%, rgba(106, 13, 173, 0.28) 32% 50%, transparent 50%),
    linear-gradient(45deg, transparent 62%, rgba(255, 46, 147, 0.1) 62% 80%, transparent 80%),
    radial-gradient(circle at 82% 18%, rgba(57, 255, 20, 0.12), transparent 32%);
}

.footer-shell {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1rem, 4vw, 2rem) 1.5rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.footer-brand-mark {
  display: grid;
  place-items: center;
  width: 2.8rem;
  height: 2.2rem;
  color: var(--color-green);
  border: 2px solid var(--color-green);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1rem;
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}

.footer-brand-name {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.4rem;
}

.footer-tagline {
  flex-basis: 100%;
  color: #b8c0d0;
  max-width: 26rem;
  margin-top: 0.3rem;
}

.footer-trust {
  flex-basis: 100%;
  color: var(--color-grid);
  font-family: var(--font-meta);
  font-size: 0.75rem;
  line-height: 1.6;
  border-left: 3px solid var(--color-pink);
  padding-left: 0.75rem;
  margin-top: 0.5rem;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #28344a;
  color: var(--color-grid);
  font-size: 0.75rem;
  font-family: var(--font-meta);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.footer-heading::before {
  content: "";
  display: block;
  width: 1.5rem;
  height: 2px;
  background: var(--color-pink);
}

.footer-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-paper);
  font-size: 0.9rem;
  transition: color 0.3s var(--ease-standard);
}

.footer-links a::before {
  content: "→";
  color: var(--color-green);
  font-family: var(--font-meta);
  font-size: 0.8rem;
}

.footer-links a:hover {
  color: var(--color-green);
}

.footer-contact address {
  font-style: normal;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.footer-contact p {
  color: #b8c0d0;
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-note {
  margin-top: 0.5rem;
  color: var(--color-grid);
  font-family: var(--font-meta);
  font-size: 0.75rem;
  line-height: 1.8;
  border-left: 2px solid var(--color-pink);
  padding-left: 0.75rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid #24304a;
  padding-top: 1.5rem;
  font-size: 0.8125rem;
  color: #8b97a9;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
}

.copyright {
  color: #8b97a9;
}

.footer-bottom a {
  color: #aab4c5;
  transition: color 0.3s var(--ease-standard);
}

.footer-bottom a:hover {
  color: var(--color-pink);
}

.legal-sep {
  color: #3b485e;
}

.footer-icp {
  font-family: var(--font-meta);
  color: #8b97a9;
}

@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

.container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.section {
  padding-block: clamp(3rem, 6vw, 5rem);
}

.content {
  max-width: 72ch;
  color: var(--color-muted);
  font-size: 1rem;
}

.content p {
  margin-bottom: 1rem;
}

.content h2,
.content h3 {
  margin: 2rem 0 0.75rem;
  color: var(--color-ink);
  font-family: var(--font-title);
}

.content ul,
.content ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

.content ul {
  list-style: square;
}

.content ol {
  list-style: decimal;
}

.content a {
  color: var(--color-purple);
  border-bottom: 1px solid rgba(106, 13, 173, 0.3);
  transition: color 0.3s var(--ease-standard), border-color 0.3s var(--ease-standard);
}

.content a:hover {
  color: var(--color-pink);
  border-color: var(--color-pink);
}

.headline {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.lead {
  font-size: 1.125rem;
  color: var(--color-muted);
  max-width: 65ch;
}

.text-accent {
  color: var(--color-pink);
}

.text-num {
  font-variant-numeric: tabular-nums;
  font-weight: 900;
  color: var(--color-pink);
}

.divider {
  border: 0;
  border-top: 1px solid var(--color-grid);
  margin-block: 2rem;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.section-heading::before {
  content: "//";
  color: var(--color-pink);
  font-family: var(--font-meta);
}

.section-index {
  font-family: var(--font-meta);
  font-size: 0.875rem;
  color: var(--color-purple);
  letter-spacing: 0.08em;
}

.section-title {
  font-family: var(--font-title);
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.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));
}

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

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

.card {
  position: relative;
  background: var(--color-panel-light);
  border: 1px solid var(--color-grid);
  color: var(--color-ink);
  transition: transform 0.3s var(--ease-standard), box-shadow 0.3s var(--ease-standard), border-color 0.3s var(--ease-standard);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.12);
  border-color: var(--color-purple);
}

.card-pad {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.card-label {
  font-family: var(--font-meta);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-purple);
  text-transform: uppercase;
}

.card-title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.3;
  margin: 0.35rem 0 0.5rem;
}

.card-desc {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.card-footer {
  margin-top: 1rem;
  font-family: var(--font-meta);
  font-size: 0.75rem;
  color: var(--color-muted);
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.panel {
  background: var(--color-panel-dark);
  border: 1px solid #2a3c58;
  color: var(--color-paper);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  border: 0;
  background: var(--color-purple);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.3s var(--ease-standard), transform 0.3s var(--ease-standard), filter 0.3s var(--ease-standard);
}

.btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-green);
  color: var(--color-ink);
}

.btn-ghost {
  background: transparent;
  box-shadow: inset 0 0 0 2px var(--color-purple);
  color: var(--color-purple);
}

.btn-ghost:hover {
  background: rgba(106, 13, 173, 0.08);
  filter: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  background: var(--color-purple);
  color: #ffffff;
  font-family: var(--font-meta);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  line-height: 1;
}

.badge-green {
  background: var(--color-green);
  color: var(--color-ink);
}

.status-dot {
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5);
  animation: status-pulse 2s infinite;
}

@keyframes status-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(57, 255, 20, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0);
  }
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  padding: 1rem 0;
  font-family: var(--font-meta);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb a {
  color: var(--color-purple);
  transition: color 0.3s var(--ease-standard);
}

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

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

.breadcrumb-sep::before {
  content: "/";
  color: var(--color-grid);
}

.media-frame {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-panel-dark);
  border: 1px solid var(--color-grid);
  color: var(--color-grid);
  font-family: var(--font-meta);
  font-size: 0.75rem;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(217, 199, 159, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 199, 159, 0.14) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.media-frame[data-media-label]::after {
  content: attr(data-media-label);
  position: relative;
  padding: 0.4rem 0.7rem;
  background: var(--color-ink);
  color: var(--color-grid);
}

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

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

.step-list {
  counter-reset: step-counter;
}

.step-list li {
  position: relative;
  counter-increment: step-counter;
  padding: 0 0 1.75rem 3rem;
  list-style: none;
}

.step-list li:not(:last-child) {
  border-left: 1px solid var(--color-grid);
  margin-left: 1.1rem;
}

.step-list li::before {
  content: counter(step-counter, decimal-leading-zero);
  position: absolute;
  left: -1.1rem;
  top: 0;
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  background: var(--color-ink);
  color: var(--color-green);
  font-family: var(--font-meta);
  font-size: 0.8rem;
}

details.acc {
  border: 1px solid var(--color-grid);
  background: var(--color-panel-light);
  color: var(--color-ink);
  margin-bottom: 1rem;
}

details.acc summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  font-weight: 700;
  font-size: 1rem;
  transition: background 0.3s var(--ease-standard);
}

details.acc summary::-webkit-details-marker {
  display: none;
}

details.acc summary:hover {
  background: rgba(106, 13, 173, 0.06);
}

details.acc summary::after {
  content: "＋";
  color: var(--color-purple);
  font-family: var(--font-meta);
  font-size: 1.25rem;
  flex-shrink: 0;
}

details.acc[open] summary {
  border-bottom: 1px solid var(--color-grid);
}

details.acc[open] summary::after {
  content: "－";
}

.acc-content {
  padding: 1rem 1.25rem;
  color: var(--color-muted);
}

.slice {
  clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.geo-grid {
  background-image:
    linear-gradient(rgba(27, 59, 111, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 59, 111, 0.1) 1px, transparent 1px);
  background-size: 32px 32px;
}

.geo-stripe {
  background: repeating-linear-gradient(135deg, rgba(106, 13, 173, 0.12) 0 2px, transparent 2px 16px);
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s var(--ease-standard), transform 0.3s var(--ease-standard);
}

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

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 150;
  width: 2.75rem;
  height: 2.75rem;
  background: var(--color-blue);
  color: var(--color-green);
  border: 2px solid var(--color-green);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition: opacity 0.3s var(--ease-standard), transform 0.3s var(--ease-standard), background 0.3s var(--ease-standard), color 0.3s var(--ease-standard);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.back-to-top:hover {
  background: var(--color-pink);
  border-color: var(--color-pink);
  color: var(--color-ink);
}

@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;
  }

  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .status-dot {
    animation: none;
  }
}