:root {
  --color-bg: #0B0F14;
  --color-panel: #131C24;
  --color-lime: #C8FF2E;
  --color-blue: #00E5FF;
  --color-orange: #FF8A3D;
  --color-text: #E8EEF4;
  --color-muted: #93A1B3;
  --color-grid: rgba(200, 255, 46, 0.2);
  --color-warning: #FFD166;
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --container: 1200px;
  --container-wide: 1440px;
  --header-h: 84px;
  --header-h-mobile: 70px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

ul[role="list"], ol[role="list"] { list-style: none; }

main { display: block; }

button { font: inherit; cursor: pointer; }

address { font-style: normal; }

body {
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(rgba(200, 255, 46, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 255, 46, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

h1 { font-size: clamp(2.4rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.1rem; }

p { margin-bottom: 1em; }

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

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

.container {
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - 48px, var(--container-wide));
  margin-inline: auto;
}

.section { padding-block: 72px; }
.section--tight { padding-block: 40px; }

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.layout-side {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
}

.layout-side__rail {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  display: grid;
  gap: 16px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-muted);
}

.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-lime); }
.breadcrumb [aria-current="page"] { color: var(--color-text); }

.btn {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  border: 0;
  color: var(--color-bg);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 0.2s ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--color-lime);
  border: 1px solid var(--color-lime);
  transform: skewX(-12deg);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover { color: var(--color-bg); }

.btn:hover::before {
  background: var(--color-blue);
  border-color: var(--color-blue);
  box-shadow: 0 10px 24px rgba(0, 229, 255, 0.22);
}

.btn:active::before { transform: skewX(-12deg) scale(0.98); }

.btn__arrow {
  display: inline-block;
  margin-left: 2px;
  transition: transform 0.2s ease;
}

.btn:hover .btn__arrow { transform: translateX(4px); }

.btn--ghost { color: var(--color-text); }
.btn--ghost::before { background: transparent; border-color: var(--color-grid); }
.btn--ghost:hover { color: var(--color-bg); }
.btn--ghost:hover::before { background: var(--color-lime); border-color: var(--color-lime); }
.btn--small { padding: 7px 14px; font-size: 0.8rem; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--color-lime);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-blue);
  transform: skewX(-30deg);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--color-grid);
  background: rgba(200, 255, 46, 0.06);
  color: var(--color-lime);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.tag::before { content: "// "; color: var(--color-blue); }

.panel {
  position: relative;
  padding: 28px;
  background: var(--color-panel);
  border: 1px solid var(--color-grid);
}

.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 44px;
  height: 3px;
  background: var(--color-lime);
  transform: skewX(-30deg);
}

.stat-card {
  position: relative;
  padding: 24px;
  background: var(--color-panel);
  border: 1px solid var(--color-grid);
  overflow: hidden;
}

.stat-card::after {
  content: "";
  position: absolute;
  right: -18px;
  bottom: -18px;
  width: 56px;
  height: 56px;
  border: 3px solid var(--color-grid);
  transform: rotate(45deg);
}

.stat-card__value {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: 2.4rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-lime);
  line-height: 1;
}

.stat-card__label { font-size: 0.85rem; color: var(--color-muted); }

.skill-node {
  position: relative;
  padding: 28px 24px 24px;
  background: var(--color-panel);
  border: 1px solid var(--color-grid);
}

.skill-node::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 24px;
  width: 34px;
  height: 3px;
  background: var(--color-blue);
  transform: skewX(-30deg);
}

.skill-node__step {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--color-orange);
}

.skill-node h3 { margin: 20px 0 8px; }

.note {
  padding: 16px 18px;
  border-left: 3px solid var(--color-warning);
  background: rgba(255, 209, 102, 0.08);
  font-size: 0.9rem;
  color: var(--color-text);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

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

.data-table th {
  font-family: var(--font-data);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-lime);
}

.data-table tbody tr:hover { background: rgba(200, 255, 46, 0.04); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-lime);
  font-weight: 700;
  text-decoration: none;
}

.link-arrow:hover { color: var(--color-blue); }

.link-arrow__icon {
  display: inline-block;
  transition: transform 0.2s ease;
}

.link-arrow:hover .link-arrow__icon { transform: translateX(4px); }

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-panel);
  border: 1px solid var(--color-grid);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.10), rgba(200, 255, 46, 0.04) 45%, transparent 70%),
    repeating-linear-gradient(-45deg, transparent 0 10px, rgba(200, 255, 46, 0.05) 10px 11px);
}

.media-frame::after {
  content: "";
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  width: 32px;
  height: 32px;
  border-top: 2px solid var(--color-lime);
  border-left: 2px solid var(--color-lime);
  pointer-events: none;
}

.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.media-frame:hover img { transform: scale(1.035); }

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--color-muted);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--color-lime);
  color: var(--color-bg);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(calc(-100% - 20px));
  transition: transform 0.2s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 15, 20, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-grid);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 180px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-lime));
  clip-path: polygon(0 0, calc(100% - 12px) 0, calc(100% - 24px) 100%, 0 100%);
}

.site-header__inner {
  max-width: var(--container-wide);
  margin-inline: auto;
  height: var(--header-h);
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.site-header__cta { flex: none; }

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 6;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-lime), var(--color-blue));
  box-shadow: 0 0 12px rgba(200, 255, 46, 0.5);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

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

.brand__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  background: var(--color-lime);
  box-shadow: 7px 0 0 var(--color-blue);
  transform: skewX(-14deg);
  transition: transform 0.25s var(--ease);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 7px 0 0 7px;
  background: var(--color-orange);
}

.brand:hover .brand__mark { transform: skewX(-14deg) scale(1.08); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-text);
  white-space: nowrap;
}

.brand__sub {
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.brand__sub::before { content: "// "; color: var(--color-lime); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 12px;
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav__link:hover {
  color: var(--color-text);
  background: rgba(200, 255, 46, 0.06);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--color-lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease);
}

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

.site-nav__index {
  font-family: var(--font-data);
  font-size: 0.68rem;
  line-height: 1;
  color: var(--color-blue);
  transition: color 0.2s ease;
}

.site-nav__link[aria-current="page"] {
  color: var(--color-text);
  background: rgba(200, 255, 46, 0.06);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--color-lime); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid var(--color-grid);
  color: var(--color-text);
  font-size: 0.88rem;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.nav-toggle__label { line-height: 1; }

.nav-toggle__box {
  position: relative;
  width: 16px;
  height: 12px;
}

.nav-toggle__box::before,
.nav-toggle__box::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform 0.25s var(--ease);
}

.nav-toggle__box::before { top: 0; }
.nav-toggle__box::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__box::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__box::after { transform: translateY(-5px) rotate(-45deg); }

.site-footer {
  position: relative;
  background: var(--color-panel);
  border-top: 1px solid var(--color-grid);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 220px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-lime));
  clip-path: polygon(0 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
}

.site-footer__inner {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: 64px 32px 40px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr;
  gap: 48px;
}

.site-footer__name {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.site-footer__tagline {
  margin-top: 6px;
  font-family: var(--font-data);
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--color-blue);
}

.site-footer__heading {
  margin-bottom: 16px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.site-footer__heading::before { content: "// "; color: var(--color-lime); }

.site-footer__nav {
  display: grid;
  gap: 10px;
}

.site-footer__link {
  color: var(--color-muted);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__link:hover {
  color: var(--color-lime);
  padding-left: 6px;
}

.site-footer__contact {
  display: grid;
  gap: 12px;
}

.site-footer__address {
  display: grid;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.site-footer__contact-item { display: block; }

.site-footer__phone {
  font-family: var(--font-data);
  font-size: 1.3rem;
  letter-spacing: 0.04em;
  color: var(--color-lime);
}

.site-footer__email { color: var(--color-text); }

.site-footer__bar {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: 20px 32px 0;
  border-top: 1px solid var(--color-grid);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--color-muted);
}

.site-footer__icp {
  letter-spacing: 0.08em;
  color: var(--color-blue);
}

.site-footer__disclaimer {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: 12px 32px 28px;
  font-size: 0.75rem;
  color: var(--color-muted);
}

.site-footer__disclaimer::before {
  content: "注意：";
  color: var(--color-warning);
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--reveal-delay, 0ms);
}

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

[data-scrollspy] a { color: var(--color-muted); }
[data-scrollspy] a:hover { color: var(--color-lime); }
[data-scrollspy] a.is-spied {
  color: var(--color-lime);
  background: rgba(200, 255, 46, 0.06);
}

@media (max-width: 1040px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 5;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 24px 20px;
    background: rgba(11, 15, 20, 0.98);
    border-bottom: 3px solid var(--color-lime);
    box-shadow: 0 30px 50px rgba(0, 0, 0, 0.5);
    max-height: calc(100vh - var(--header-h-mobile));
    overflow-y: auto;
  }

  .site-nav[data-open] { display: flex; }

  .site-nav__link {
    padding: 14px 8px;
    border-bottom: 1px solid var(--color-grid);
    gap: 12px;
    font-size: 0.95rem;
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    border-left: 3px solid var(--color-lime);
    padding-left: 14px;
  }

  .site-nav__index { font-size: 0.72rem; }

  .site-header__inner {
    height: var(--header-h-mobile);
    padding: 0 20px;
    gap: 12px;
  }

  .brand__name { font-size: 1.12rem; }
  .brand__sub { font-size: 0.6rem; }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer__brand { grid-column: 1 / -1; }

  .layout-side { grid-template-columns: 1fr; }
  .layout-side__rail { position: static; }

  .section { padding-block: 56px; }
}

@media (max-width: 860px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .section { padding-block: 48px; }

  .site-footer__inner {
    grid-template-columns: 1fr;
    padding: 48px 20px 32px;
  }

  .site-footer__brand { grid-column: auto; }

  .site-footer__bar {
    padding: 16px 20px 0;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer__disclaimer {
    padding: 12px 20px 24px;
  }

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

  .container,
  .container--wide { width: min(100% - 28px, var(--container)); }
}

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

  .site-header__cta {
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  .site-header__cta .btn__arrow { display: none; }
}

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

  *, *::before, *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }

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

  .btn:hover::before { box-shadow: none; }
}