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

:root {
  --color-accent: #E63946;
  --color-bg: #0D0D0D;
  --color-surface: #141414;
  --color-line: #2A2A2A;
  --color-line-deep: #3A3A3A;
  --color-link: #4DA8DA;
  --color-green: #39FF14;
  --color-warning: #FFD60A;
  --color-text: #F5F5F5;
  --color-text-secondary: #B0B0B0;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Source Code Pro", Menlo, Consolas, "Courier New", monospace;
  --content-max: 1200px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  --shadow-panel: 8px 8px 0 rgba(0, 0, 0, 0.55);
  --shadow-nav: 0 12px 28px rgba(0, 0, 0, 0.6);
  --ease-out: 200ms ease-out;
}

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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
}

main {
  display: block;
  flex: 1;
  width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  line-height: 1.2;
  color: var(--color-text);
  font-weight: 800;
  overflow-wrap: break-word;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

h3 {
  font-size: 1.25rem;
}

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

ul, ol {
  padding-left: 1.25rem;
  margin-bottom: var(--space-lg);
}

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

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  padding: 0.125rem 0.375rem;
  border-radius: 2px;
}

blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-lg);
  margin: var(--space-lg) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  margin-bottom: var(--space-xl);
}

th, td {
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-line);
  text-align: left;
  font-size: 0.875rem;
}

th {
  background: rgba(255, 255, 255, 0.03);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

td {
  color: var(--color-text);
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--ease-out), border-color var(--ease-out);
}

a:hover,
a:focus-visible {
  color: var(--color-accent);
}

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

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

.content-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl) var(--space-4xl);
  width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-line);
}

.scroll-progress {
  height: 3px;
  background: var(--color-line);
  overflow: hidden;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--color-accent);
  transition: width 80ms linear;
}

.skip-link {
  position: absolute;
  left: -10000px;
  top: 0;
  z-index: 1000;
  padding: 0.6rem 1rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
}

.skip-link:focus-visible {
  left: 0;
  color: var(--color-bg);
  outline: none;
}

.header-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--color-accent);
  color: #000000;
  font-weight: 900;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  transform: skewX(-5deg);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.6);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: 1.0625rem;
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.brand-slogan::before {
  content: "› ";
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 1px solid var(--color-line);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle-line {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 200ms ease-out, opacity 200ms ease-out;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--ease-out), border-color var(--ease-out);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
  border-bottom-color: var(--color-line-deep);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 700;
}

.nav-index {
  font-size: 0.625rem;
  color: var(--color-text-secondary);
}

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

.site-footer {
  margin-top: auto;
  background: var(--color-surface);
  border-top: 2px solid var(--color-line);
  border-bottom: 4px solid var(--color-accent);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 120px;
  height: 4px;
  background: var(--color-accent);
}

.footer-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl) var(--space-xl);
  width: 100%;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 0.8fr 1.2fr;
  gap: var(--space-3xl) var(--space-2xl);
  padding-bottom: var(--space-3xl);
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  margin-bottom: var(--space-lg);
}

.footer-about {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 42ch;
  margin-bottom: var(--space-lg);
}

.footer-trust {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-line-deep);
  padding-left: var(--space-lg);
  max-width: 56ch;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-line);
}

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

.footer-list li {
  margin-bottom: var(--space-sm);
}

.footer-list a {
  color: var(--color-link);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--ease-out);
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--color-accent);
}

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

.footer-contact-list li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
  overflow-wrap: anywhere;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-line);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-secondary);
}

.breadcrumb {
  margin-bottom: var(--space-3xl);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  margin: 0;
}

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

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

.breadcrumb-item a:hover,
.breadcrumb-item a:focus-visible {
  color: var(--color-accent);
}

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

.panel {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-panel);
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-line);
  background: rgba(255, 255, 255, 0.02);
}

.panel-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 700;
}

.panel-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.01em;
}

.panel-body {
  padding: var(--space-xl);
}

.panel-body > :last-child {
  margin-bottom: 0;
}

.section-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-line);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(230, 57, 70, 0.12);
  border: 1px solid var(--color-accent);
  padding: 0.2rem 0.5rem;
}

.section-title {
  font-family: var(--font-sans);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 900;
  line-height: 1.1;
  transform: skewX(-5deg);
  margin: 0;
}

.section-status {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-green);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.tag-red {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(230, 57, 70, 0.1);
}

.tag-blue {
  color: var(--color-link);
  border-color: var(--color-link);
  background: rgba(77, 168, 218, 0.1);
}

.tag-green {
  color: var(--color-green);
  border-color: var(--color-green);
  background: rgba(57, 255, 20, 0.06);
}

.tag-yellow {
  color: var(--color-warning);
  border-color: var(--color-warning);
  background: rgba(255, 214, 10, 0.08);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 6px rgba(57, 255, 20, 0.6);
  animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 6px rgba(57, 255, 20, 0.6);
  }
  50% {
    opacity: 0.4;
    box-shadow: 0 0 2px rgba(57, 255, 20, 0.2);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border: 2px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  line-height: 1.4;
  transition: background var(--ease-out), color var(--ease-out), border-color var(--ease-out);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--color-link);
  color: var(--color-link);
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #000000;
  font-weight: 700;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-line-deep);
  color: var(--color-text-secondary);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-link);
  color: var(--color-link);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-panel);
  padding: var(--space-xl);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.card-text {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0;
}

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

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

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

.img-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background:
    linear-gradient(45deg, var(--color-surface) 25%, transparent 25%),
    linear-gradient(-45deg, var(--color-surface) 25%, transparent 25%),
    var(--color-bg);
  background-size: 16px 16px;
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.img-frame::before {
  content: attr(data-label);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

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

.img-frame-wide {
  aspect-ratio: 16 / 9;
  min-height: 0;
}

@media (max-width: 900px) {
  .header-shell {
    min-height: 56px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-line);
    border-bottom: 2px solid var(--color-line);
    box-shadow: var(--shadow-nav);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 200ms ease-out, opacity 200ms ease-out, visibility 200ms ease-out;
  }

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

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

  .nav-item {
    border-bottom: 1px solid var(--color-line);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem var(--space-xl);
    border-bottom: none;
    font-size: 0.875rem;
  }

  .nav-link[aria-current="page"] {
    background: rgba(230, 57, 70, 0.08);
  }

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

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

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

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

  .img-frame-wide {
    aspect-ratio: 4 / 3;
  }
}

@media (max-width: 640px) {
  .content-shell {
    padding: var(--space-2xl) var(--space-lg) var(--space-3xl);
  }

  .header-shell {
    padding: 0 var(--space-lg);
  }

  .brand-slogan {
    display: none;
  }

  .footer-shell {
    padding: var(--space-2xl) var(--space-lg) var(--space-lg);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

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

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

  .section-head {
    gap: 0.5rem;
  }

  .section-status {
    margin-left: 0;
  }
}

@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-bar {
    transition: none;
  }
}