:root {
  --c-bg-deep: #0B1026;
  --c-accent-purple: #7B2FEF;
  --c-accent-green: #C6FF3D;
  --c-teal: #0D4A5A;
  --c-wine: #5E1B3A;
  --c-indigo: #1A1B4B;
  --c-text-light: #F2F4F8;
  --c-text-muted: #A0A8B8;
  --c-panel: rgba(16, 20, 40, 0.75);
  --font-heading: 'Rajdhani', 'Exo 2', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'JetBrains Mono', 'IBM Plex Mono', monospace;
  --header-width: 260px;
  --rail-width: 64px;
  --content-max: 1240px;
  --border-purple: 1px solid rgba(123, 47, 239, 0.45);
  --border-green: 1px solid rgba(198, 255, 61, 0.55);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text-light);
  background-color: var(--c-bg-deep);
  background-image:
    linear-gradient(rgba(11, 16, 38, 0.9), rgba(11, 16, 38, 0.9)),
    linear-gradient(rgba(123, 47, 239, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123, 47, 239, 0.1) 1px, transparent 1px);
  background-size: auto, 48px 48px, 48px 48px;
  padding-left: var(--header-width);
  padding-right: var(--rail-width);
  min-height: 100vh;
}

:focus {
  outline: 2px solid var(--c-accent-green);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

a {
  color: var(--c-text-light);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: var(--c-accent-green);
}

/* ===== Skip Link ===== */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 1400;
  padding: 12px 20px;
  background: var(--c-accent-green);
  color: var(--c-bg-deep);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: top 0.2s var(--ease);
  pointer-events: auto;
}

.skip-link:focus {
  top: 16px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
}

.header-aside {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-width);
  display: flex;
  flex-direction: column;
  padding: 28px 20px 24px;
  background: rgba(16, 20, 40, 0.88);
  border-right: 1px solid rgba(123, 47, 239, 0.5);
  pointer-events: auto;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border: 2px solid var(--c-accent-green);
  color: var(--c-accent-green);
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  font-style: italic;
  transform: rotate(-3deg);
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.brand-tagline {
  font-size: 12px;
  color: var(--c-text-muted);
  letter-spacing: 0.28em;
}

.brand-domain {
  display: block;
  margin-top: 12px;
  margin-left: 3px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--c-text-muted);
  letter-spacing: 0.02em;
}

.site-nav {
  margin-top: 40px;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 600;
  font-style: italic;
  letter-spacing: 0.03em;
  color: var(--c-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transform: rotate(-1deg);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 100%;
  bottom: 4px;
  height: 1px;
  background: var(--c-accent-green);
  transition: right 0.25s var(--ease);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--c-text-light);
  border-left-color: var(--c-accent-green);
  background: linear-gradient(90deg, rgba(198, 255, 61, 0.07), transparent);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  right: 0;
}

.nav-index {
  font-family: var(--font-data);
  font-size: 12px;
  font-style: normal;
  color: var(--c-accent-purple);
  min-width: 24px;
  transition: color 0.2s var(--ease);
}

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

.nav-item {
  line-height: 1.2;
}

.header-status {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-text-muted);
  border-top: 1px solid rgba(160, 168, 184, 0.18);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent-green);
  box-shadow: 0 0 8px rgba(198, 255, 61, 0.8);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: 1px solid rgba(123, 47, 239, 0.6);
  padding: 10px 12px;
  cursor: pointer;
  color: var(--c-text-light);
  font-family: var(--font-heading);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-accent-green);
}

.nav-toggle-label {
  font-size: 11px;
  color: var(--c-text-muted);
  letter-spacing: 0.08em;
}

.header-right {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--rail-width);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(16, 20, 40, 0.6);
  border-left: 1px solid rgba(123, 47, 239, 0.25);
  pointer-events: auto;
}

.feedback-rail {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  text-align: center;
  padding: 16px 8px;
  color: var(--c-accent-green);
  text-decoration: none;
  font-family: var(--font-heading);
  font-style: italic;
  letter-spacing: 0.08em;
  font-size: 15px;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.feedback-rail:hover {
  background: rgba(198, 255, 61, 0.08);
  color: var(--c-accent-green);
}

.feedback-rail-dot {
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent-green);
  box-shadow: 0 0 10px var(--c-accent-green);
  margin: 6px auto 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--c-accent-green);
  box-shadow: 0 0 12px rgba(198, 255, 61, 0.9);
  pointer-events: none;
  z-index: 1300;
}

/* ===== Footer ===== */
.site-footer {
  margin-top: 80px;
  background:
    linear-gradient(180deg, rgba(26, 27, 75, 0.85), rgba(13, 74, 90, 0.75)),
    var(--c-bg-deep);
  border-top: 2px solid var(--c-accent-purple);
  color: var(--c-text-muted);
}

.footer-shell {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.4fr;
  gap: 40px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 56px 32px;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  font-style: italic;
  color: var(--c-text-light);
  text-decoration: none;
}

.footer-about {
  margin-top: 14px;
  max-width: 360px;
  font-size: 15px;
  color: var(--c-text-muted);
}

.footer-col {
  min-width: 0;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-light);
  margin-bottom: 16px;
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link-list a {
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 14px;
}

.footer-link-list a:hover {
  color: var(--c-accent-green);
  text-decoration: underline dotted;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--c-text-muted);
}

.footer-bottom {
  border-top: 1px solid rgba(160, 168, 184, 0.15);
  padding: 16px 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  color: var(--c-text-muted);
}

/* ===== Layout & Common ===== */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 56px 0;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
}

.section-index {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--c-accent-purple);
  flex-shrink: 0;
}

.page-head {
  padding: 56px 0 28px;
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 700;
  line-height: 1.04;
  transform: rotate(-1deg);
  letter-spacing: 0.01em;
  color: var(--c-text-light);
}

.page-lead {
  margin-top: 16px;
  max-width: 70ch;
  font-size: 18px;
  color: var(--c-text-muted);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin-bottom: 20px;
  font-size: 14px;
}

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

.breadcrumb a:hover {
  color: var(--c-accent-green);
}

.breadcrumb-item::after {
  content: "/";
  margin-left: 10px;
  color: rgba(160, 168, 184, 0.5);
}

.breadcrumb-current {
  color: var(--c-text-light);
}

.panel {
  background: var(--c-panel);
  border: var(--border-purple);
  padding: 28px;
}

.panel--teal {
  background: rgba(13, 74, 90, 0.5);
  border-color: rgba(13, 74, 90, 0.9);
}

.panel--wine {
  background: rgba(94, 27, 58, 0.42);
  border-color: rgba(94, 27, 58, 0.9);
}

.panel--indigo {
  background: rgba(26, 27, 75, 0.7);
  border-color: rgba(123, 47, 239, 0.4);
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border: 2px solid var(--c-accent-purple);
  background: transparent;
  color: var(--c-text-light);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 16px;
  font-style: italic;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.btn:hover {
  background: var(--c-accent-purple);
  color: var(--c-text-light);
}

.btn--accent {
  border-color: var(--c-accent-green);
  color: var(--c-accent-green);
}

.btn--accent:hover {
  background: var(--c-accent-green);
  color: var(--c-bg-deep);
}

.btn--ghost {
  border-color: rgba(160, 168, 184, 0.5);
}

.btn--ghost:hover {
  background: rgba(160, 168, 184, 0.15);
  color: var(--c-text-light);
}

.data-num {
  font-family: var(--font-data);
  font-size: 30px;
  font-variant-numeric: tabular-nums;
  color: var(--c-accent-green);
}

.img-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  overflow: hidden;
  border: 1px solid rgba(123, 47, 239, 0.45);
  background: linear-gradient(135deg, rgba(123, 47, 239, 0.15), rgba(13, 74, 90, 0.45));
}

.img-frame::before {
  content: attr(data-caption);
  display: block;
  padding: 6px 14px;
  border: 1px dashed rgba(160, 168, 184, 0.5);
  color: var(--c-text-muted);
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.img-frame--hero {
  min-height: 340px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root {
    --header-width: 220px;
    --rail-width: 52px;
  }

  .nav-link {
    font-size: 17px;
  }

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

@media (max-width: 768px) {
  body {
    padding-left: 0;
    padding-right: 0;
  }

  .site-header {
    position: sticky;
    top: 0;
    width: 100%;
    height: auto;
    display: flex;
    align-items: center;
  }

  .header-aside {
    position: relative;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    padding: 12px 16px;
    background: rgba(16, 20, 40, 0.92);
    border-right: none;
    border-bottom: 1px solid rgba(123, 47, 239, 0.4);
  }

  .brand-link {
    flex-shrink: 0;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

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

  .brand-tagline {
    display: none;
  }

  .brand-domain {
    display: none;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    margin-top: 0;
    padding: 16px;
    background: rgba(16, 20, 40, 0.96);
    border-bottom: 1px solid rgba(123, 47, 239, 0.4);
    display: block;
  }

  html.has-js .site-nav {
    display: none;
  }

  html.has-js .site-nav[data-open] {
    display: block;
  }

  .header-status {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .header-right {
    position: static;
    width: auto;
    height: auto;
    border: none;
    background: none;
    margin-left: 8px;
  }

  .feedback-rail {
    writing-mode: horizontal-tb;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid rgba(198, 255, 61, 0.5);
    font-size: 13px;
  }

  .feedback-rail-dot {
    margin: 0;
    width: 6px;
    height: 6px;
  }

  .container {
    padding: 0 20px;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 24px;
  }

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