:root {
  --color-primary: #2563EB;
  --color-primary-deep: #1D4ED8;
  --color-purple: #7C3AED;
  --color-accent: #F97316;
  --color-accent-deep: #D85F0A;
  --color-bg: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-bg-alt: #E2E8F0;
  --color-dark: #0B1120;
  --color-text: #1E293B;
  --color-text-soft: #475569;
  --color-muted: #64748B;
  --color-border: #334155;
  --color-line: #E2E8F0;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-head: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Impact, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", "Liberation Mono", Consolas, monospace;
  --page-max: 1240px;
  --page-gutter: 1rem;
  --header-h: 72px;
  --radius: 4px;
  --shadow-strong: 10px 10px 0 rgba(37, 99, 235, 0.14), 0 20px 50px rgba(2, 6, 23, 0.12);
  --shadow-soft: 6px 6px 0 rgba(124, 58, 237, 0.12);
}

@media (min-width: 640px) {
  :root {
    --page-gutter: 1.5rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --page-gutter: 2.5rem;
    --header-h: 80px;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

button {
  font: inherit;
  cursor: pointer;
}

#main-content {
  outline: none;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 2000;
  display: inline-block;
  background: var(--color-dark);
  color: #FFFFFF;
  border: 2px solid var(--color-accent);
  padding: 0.75rem 1rem;
  text-decoration: none;
  transition: top 0.2s ease;
}

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

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

.container,
.header-shell,
.footer-shell {
  width: min(calc(100% - var(--page-gutter) - var(--page-gutter)), var(--page-max));
  margin-inline: auto;
}

.page {
  padding-block: clamp(2rem, 6vw, 4.5rem);
}

.section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.section--dark {
  background-color: var(--color-dark);
  color: #E2E8F0;
}

.page-header {
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: 1.5rem;
  border-bottom: 3px solid var(--color-purple);
}

.page-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin: 0.4rem 0 0.8rem;
  color: var(--color-text);
}

.page-lead {
  max-width: 68ch;
  color: var(--color-text-soft);
  font-size: 1.1rem;
  line-height: 1.7;
}

.section-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 0.8rem;
  color: var(--color-text);
}

.section--dark .section-title {
  color: #FFFFFF;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-purple);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 2.2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-purple));
  margin-right: 0.7rem;
  vertical-align: middle;
}

.breadcrumb {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  color: var(--color-text-soft);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--color-purple);
}

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

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

.editorial {
  display: grid;
  grid-template-columns: minmax(160px, 0.75fr) minmax(0, 2.25fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}

.note-column {
  border-left: 3px solid var(--color-purple);
  padding-left: 1.1rem;
  color: var(--color-text-soft);
  font-size: 0.92rem;
  line-height: 1.7;
}

.content-column {
  min-width: 0;
}

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

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

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

.panel {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: clamp(1.2rem, 3vw, 2rem);
  box-shadow: var(--shadow-strong);
}

.panel--strong {
  border-color: var(--color-purple);
  background: linear-gradient(145deg, #FFFFFF 0%, var(--color-bg-alt) 100%);
}

.data-text {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--color-primary);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.65rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

.tag--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #FFFFFF;
}

.tag--purple {
  background: rgba(124, 58, 237, 0.12);
  border-color: var(--color-purple);
  color: var(--color-purple);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  list-style: none;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-soft);
}

.legend-item::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  background: var(--color-primary);
  border: 2px solid var(--color-purple);
  transform: rotate(45deg);
}

.legend-item--accent::before {
  background: var(--color-accent);
  border-color: var(--color-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  padding: 0.85rem 1.4rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.95rem;
  line-height: 1;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: #FFFFFF;
  box-shadow: 6px 6px 0 rgba(37, 99, 235, 0.22);
}

.btn-accent {
  background: var(--color-accent);
  color: #FFFFFF;
  box-shadow: 6px 6px 0 rgba(249, 115, 22, 0.25);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
  box-shadow: none;
}

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

.btn-primary:hover {
  box-shadow: 10px 10px 0 rgba(37, 99, 235, 0.25);
}

.btn-accent:hover {
  box-shadow: 10px 10px 0 rgba(249, 115, 22, 0.3);
}

.btn-ghost:hover {
  border-color: var(--color-purple);
  color: var(--color-purple);
}

.media-frame {
  display: block;
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: var(--color-dark);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-strong);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.35), rgba(124, 58, 237, 0.2));
  mix-blend-mode: overlay;
}

.media-frame--screen {
  aspect-ratio: 16 / 9;
}

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

.media-frame--terrace {
  background:
    radial-gradient(circle at 20% 30%, rgba(124, 58, 237, 0.35) 0 6%, transparent 6.5%),
    radial-gradient(circle at 35% 38%, rgba(37, 99, 235, 0.3) 0 8%, transparent 8.5%),
    radial-gradient(circle at 55% 55%, rgba(249, 115, 22, 0.25) 0 4%, transparent 4.5%),
    repeating-linear-gradient(155deg, transparent 0 42px, rgba(124, 58, 237, 0.1) 42px 44px, transparent 44px 88px, rgba(37, 99, 235, 0.08) 88px 91px),
    linear-gradient(145deg, #0B1120, #1E293B);
}

.media-frame--data {
  background-color: var(--color-dark);
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 58, 237, 0.18) 1px, transparent 1px);
  background-size: 28px 28px;
}

.coordinate-grid {
  background-image:
    linear-gradient(to right, rgba(37, 99, 235, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124, 58, 237, 0.16) 1px, transparent 1px);
  background-size: 56px 56px;
}

.terrain-bg {
  background-color: var(--color-dark);
  background-image:
    radial-gradient(circle at 20% 15%, rgba(124, 58, 237, 0.28), transparent 32%),
    radial-gradient(circle at 85% 20%, rgba(37, 99, 235, 0.22), transparent 36%),
    repeating-linear-gradient(115deg, transparent 0 34px, rgba(124, 58, 237, 0.06) 34px 36px),
    repeating-linear-gradient(20deg, transparent 0 58px, rgba(37, 99, 235, 0.05) 58px 60px);
  color: #E2E8F0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 17, 32, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 2px solid rgba(124, 58, 237, 0.55);
  box-shadow: 0 1px 0 rgba(37, 99, 235, 0.25), 0 14px 30px rgba(2, 6, 23, 0.35);
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: #FFFFFF;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  color: #FFFFFF;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.25rem;
  border-radius: 50%;
  box-shadow: 4px 4px 0 rgba(249, 115, 22, 0.8);
}

.brand-info {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.25rem;
  line-height: 1;
  letter-spacing: 0.02em;
}

.brand-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  background: transparent;
  border: 0;
  border-radius: var(--radius);
  color: #FFFFFF;
}

.nav-toggle-box {
  position: relative;
  display: block;
  width: 1.1rem;
  height: 0.8rem;
}

.nav-toggle-box span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: #FFFFFF;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

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

.nav-toggle-box span:nth-child(2) {
  top: 0.35rem;
}

.nav-toggle-box span:nth-child(3) {
  top: 0.7rem;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(1) {
  top: 0.35rem;
  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: 0.35rem;
  transform: rotate(-45deg);
}

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-item {
  display: flex;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.95rem 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 700;
  font-size: 0.94rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-purple), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: #FFFFFF;
}

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

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  opacity: 0.65;
  transform: translateY(0.1em);
}

.nav-label {
  display: inline-block;
}

.site-footer {
  position: relative;
  overflow: hidden;
  background-color: var(--color-dark);
  color: #E2E8F0;
  font-size: 0.95rem;
  background-image:
    radial-gradient(circle at 12% 20%, rgba(124, 58, 237, 0.32), transparent 30%),
    radial-gradient(circle at 85% 10%, rgba(37, 99, 235, 0.28), transparent 32%),
    repeating-linear-gradient(120deg, transparent 0 36px, rgba(37, 99, 235, 0.07) 36px 38px);
}

.footer-shell {
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.footer-brand .brand-name {
  font-size: 1.5rem;
}

.brand--footer .brand-mark {
  width: 2.9rem;
  height: 2.9rem;
  font-size: 1.4rem;
}

.brand--footer .brand-tag {
  color: #94A3B8;
}

.footer-statement {
  margin: 1.25rem 0 1rem;
  max-width: 34rem;
  border-left: 3px solid var(--color-accent);
  padding-left: 0.9rem;
  color: #94A3B8;
  line-height: 1.7;
}

.footer-coordinate {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  font-size: 0.78rem;
}

.coordinate-index {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.coordinate-label {
  color: #64748B;
}

.footer-heading {
  margin: 0 0 1rem;
  color: #FFFFFF;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-list {
  display: grid;
  gap: 0.55rem;
  list-style: none;
}

.footer-list a {
  color: #CBD5E1;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-list a:hover {
  color: #FFFFFF;
  border-color: var(--color-accent);
}

.footer-contact-list {
  display: grid;
  gap: 0.5rem;
  list-style: none;
  color: #CBD5E1;
  line-height: 1.5;
}

.footer-contact-list li::before {
  content: "→";
  margin-right: 0.5rem;
  color: var(--color-purple);
}

.footer-service-note {
  margin-top: 0.9rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  color: #64748B;
  font-size: 0.8rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #94A3B8;
}

.footer-icp a {
  color: #94A3B8;
  text-decoration: none;
}

.footer-icp a:hover {
  color: #FFFFFF;
}

.footer-meta {
  letter-spacing: 0.04em;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  width: 0;
  height: 4px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--color-primary), var(--color-purple), var(--color-accent));
}

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .header-shell {
    min-height: 64px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    background: rgba(11, 17, 32, 0.97);
    border-top: 2px solid var(--color-purple);
    border-bottom: 2px solid rgba(37, 99, 235, 0.5);
    box-shadow: 0 24px 48px rgba(2, 6, 23, 0.4);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.3s ease, visibility 0s linear 0.3s;
  }

  .site-nav[data-open] {
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    visibility: visible;
    transition: max-height 0.3s ease, visibility 0s linear 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 1rem;
  }

  .nav-link {
    padding: 0.95rem 1rem;
  }

  .nav-link::after {
    left: 1rem;
    right: 1rem;
  }

  .nav-link[aria-current="page"] {
    background: rgba(37, 99, 235, 0.16);
  }

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

  .note-column {
    border-left: 0;
    border-top: 3px solid var(--color-purple);
    padding: 1rem 0 0;
  }

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

@media (max-width: 600px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: auto;
  }

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

@media (max-width: 480px) {
  .nav-toggle-text {
    display: none;
  }

  .brand-tag {
    display: none;
  }
}

@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;
  }

  .scroll-progress {
    display: none;
  }
}