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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 1.5rem;
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
a { color: inherit; }

:root {
  --ink-950: #07130F;
  --ink-900: #0B1F1A;
  --ink-800: #12332A;
  --ink-750: #17402F;
  --line: #2A4A3E;
  --lime: #C6FF3D;
  --lime-dim: #8FBF1F;
  --orange: #FF8A3D;
  --orange-deep: #C25A1E;
  --paper: #F2F5E9;
  --muted: #9DB3A6;

  --font-display: "Oswald", "Barlow Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Noto Sans Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --shell: 1280px;
  --gutter: clamp(1.1rem, 4vw, 3.5rem);

  --radius-sm: 6px;
  --radius-md: 14px;
  --radius-lg: 28px;

  --ease: cubic-bezier(.22, .68, .28, 1);
  --dur: .2s;

  --shadow-panel: 0 18px 44px -28px rgba(0, 0, 0, .9);
}

body {
  background-color: var(--ink-950);
  background-image:
    radial-gradient(1100px 620px at 84% -12%, rgba(198, 255, 61, .10), transparent 62%),
    radial-gradient(880px 520px at 4% 6%, rgba(255, 138, 61, .08), transparent 66%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.66;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ============ 基础排版 ============ */

.display-xl {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 10.5vw, 7.5rem);
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--paper);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 3rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.lede {
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.72;
  color: var(--muted);
  max-width: 46ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.tag-mono {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lime);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
}

/* ============ 布局工具 ============ */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section {
  padding-block: clamp(2.4rem, 6vw, 4.6rem);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.6rem);
}

/* ============ 按钮 ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6em;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn--primary { background: var(--lime); color: var(--ink-950); }
.btn--primary:hover { background: #d8ff74; transform: translateY(-2px); }

.btn--ghost { background: transparent; color: var(--paper); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--lime); color: var(--lime); transform: translateY(-2px); }

.btn--score { background: var(--orange); color: #201006; }
.btn--score:hover { background: #ffa066; transform: translateY(-2px); }

/* ============ 面板 / 路径条 / 媒体容器 ============ */

.panel {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: clamp(1.1rem, 2.4vw, 1.7rem);
  box-shadow: var(--shadow-panel);
}

.path-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

.path-bar a { color: var(--muted); text-decoration: none; transition: color var(--dur) var(--ease); }
.path-bar a:hover { color: var(--lime); }
.path-bar__sep { color: var(--line); }
.path-bar [aria-current="page"] { color: var(--lime); }

.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 10;
  background-color: var(--ink-800);
  background-image:
    linear-gradient(135deg, rgba(198, 255, 61, .16), rgba(255, 138, 61, .13) 58%, transparent 88%),
    repeating-linear-gradient(135deg, rgba(242, 245, 233, .05) 0 2px, transparent 2px 9px);
}

.media > img,
.media > picture > img,
.media > video,
.media > canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1; }
.media--portrait { aspect-ratio: 4 / 5; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  position: absolute;
  inset: auto 0 0 0;
  margin: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper);
  background: linear-gradient(to top, rgba(7, 19, 15, .94), transparent);
}

/* ============ 跳转链接 ============ */

.skip-link {
  position: absolute;
  left: 14px;
  top: -80px;
  z-index: 140;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus-visible { top: 0; }

/* ============ 页头 ============ */

.site-header {
  position: relative;
  z-index: 60;
  background: var(--ink-950);
  color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.path-rail {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 120;
  pointer-events: none;
  background: rgba(42, 74, 62, .5);
}

.path-rail__fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--lime) 0%, var(--lime-dim) 62%, var(--orange) 100%);
  box-shadow: 0 0 16px rgba(198, 255, 61, .45);
  transition: width .1s linear;
}

.header-utility {
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.header-utility__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .45rem 1.6rem;
  padding-block: 9px;
}

.header-utility__note {
  display: flex;
  align-items: center;
  gap: .55rem;
  color: var(--muted);
  letter-spacing: .12em;
}

.header-utility__list {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem 1.5rem;
}

.header-utility__list a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

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

.masthead {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "toggle brand cta";
  align-items: center;
  gap: 12px 14px;
  padding-block: 18px 16px;
}

.nav-toggle {
  grid-area: toggle;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--dur) var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

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

.brand {
  grid-area: brand;
  justify-self: center;
  display: grid;
  justify-items: center;
  gap: 5px;
  text-align: center;
  text-decoration: none;
  color: var(--paper);
  line-height: 1;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  letter-spacing: -.02em;
  white-space: nowrap;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.header-cta {
  grid-area: cta;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: 10px 16px;
  background: var(--lime);
  color: var(--ink-950);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.header-cta::after { content: "→"; }

.header-cta:hover {
  background: #d8ff74;
  transform: translateY(-1px);
}

.site-nav {
  display: none;
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.site-nav[data-open="true"] { display: block; }

.site-nav__list {
  display: flex;
  flex-direction: column;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 6px var(--gutter) 18px;
}

.site-nav__link {
  position: relative;
  display: block;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  text-decoration: none;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.site-nav__link:hover { color: var(--paper); }

.site-nav__link::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: var(--lime);
  box-shadow: 0 0 14px rgba(198, 255, 61, .6);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__link:last-child { border-bottom: 0; }
.site-nav__link:hover::after { transform: scaleX(1); }

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

/* ============ 页脚 ============ */

.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(2.4rem, 7vw, 6rem);
  background: var(--ink-950);
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: -46% -12% auto auto;
  width: min(700px, 82vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(255, 138, 61, .17), transparent 66%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: auto auto -30% -10%;
  width: min(560px, 70vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(198, 255, 61, .10), transparent 68%);
  pointer-events: none;
}

.footer-shell {
  position: relative;
  z-index: 1;
  padding-block: clamp(2.6rem, 6vw, 4.4rem) 1.7rem;
}

.footer-lead {
  display: grid;
  gap: 12px;
  padding-bottom: clamp(1.5rem, 3vw, 2.3rem);
  border-bottom: 1px solid var(--line);
}

.footer-lead__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--lime);
}

.footer-lead__line {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.6vw, 3rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 14em;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  padding-block: clamp(1.8rem, 4vw, 2.8rem);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--paper);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.footer-brand-link {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  letter-spacing: -.01em;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.footer-brand-link:hover { color: var(--lime); }

.footer-brand-note {
  max-width: 30ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.footer-links { display: grid; gap: 9px; }

.footer-links a {
  display: inline-flex;
  align-items: baseline;
  gap: .45em;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-links a::before {
  content: "→";
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line);
  transition: color var(--dur) var(--ease);
}

.footer-links a:hover { color: var(--paper); transform: translateX(3px); }
.footer-links a:hover::before { color: var(--lime); }

.footer-contact { font-size: 13.5px; }

.footer-contact dt {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-contact dt:first-of-type { margin-top: 0; }

.footer-contact dd {
  margin-top: 2px;
  color: var(--paper);
  line-height: 1.55;
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .55rem 1.6rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

.footer-bottom__meta { letter-spacing: .08em; }
.footer-bottom__icp { color: var(--lime-dim); }

.footer-bottom__note {
  flex: 1 1 100%;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0;
  line-height: 1.7;
  color: var(--muted);
  opacity: .88;
}

/* ============ 显现协议 ============ */

[data-reveal="pending"] {
  opacity: 0;
  transform: translate3d(-12px, 0, 0);
}

[data-reveal="in"] {
  opacity: 1;
  transform: none;
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

/* ============ 平板 ============ */

@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ============ 桌面 ============ */

@media (min-width: 861px) {
  .masthead {
    grid-template-columns: 1fr auto 1fr;
    grid-template-areas: "toggle brand cta";
    padding-block: 22px 18px;
  }

  .nav-toggle { display: none; }

  .site-nav {
    display: block;
    border-top: 1px solid var(--line);
  }

  .site-nav__list {
    flex-direction: row;
    justify-content: center;
    gap: clamp(1rem, 2.6vw, 2.8rem);
    padding: 0 var(--gutter);
  }

  .site-nav__link {
    padding: 17px 2px 15px;
    border-bottom: 0;
    border-top: 2px solid transparent;
  }
}

@media (min-width: 1000px) {
  .footer-grid { grid-template-columns: 1.5fr .8fr .8fr 1.35fr; }
}

/* ============ 小屏微调 ============ */

@media (max-width: 560px) {
  .masthead {
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "toggle cta"
      "brand brand";
  }

  .brand { justify-self: center; padding-top: 4px; }

  .header-cta {
    font-size: 10px;
    padding: 9px 13px;
    letter-spacing: .06em;
  }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 400px) {
  .header-utility__note { display: none; }
  .header-utility__inner { justify-content: flex-start; }
}

/* ============ 动效克制 ============ */

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

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  [data-reveal="pending"] {
    opacity: 1;
    transform: none;
  }

  .path-rail__fill { transition: none; }
}