:root {
  --ink-0: #071713;
  --ink-1: #0E2A22;
  --ink-2: #111413;
  --ink-3: #1E3B31;
  --lime: #C8FF3D;
  --lime-soft: #E9FFB0;
  --alert: #FF5A3C;
  --paper: #F3F6EE;
  --muted: #8EA69C;
  --line-lime: rgba(200, 255, 61, 0.16);
  --line-soft: rgba(142, 166, 156, 0.26);
  --font-display: -apple-system, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --step-0: clamp(1rem, 0.96rem + 0.18vw, 1.0625rem);
  --step-1: clamp(1.125rem, 1.04rem + 0.4vw, 1.375rem);
  --step-2: clamp(1.5rem, 1.28rem + 0.95vw, 2.125rem);
  --step-3: clamp(1.9rem, 1.4rem + 2.2vw, 3.25rem);
  --step-4: clamp(2.6rem, 1.4rem + 5.4vw, 6.5rem);
  --radius-l: 28px;
  --radius-m: 18px;
  --radius-s: 12px;
  --radius-pill: 999px;
  --gutter: clamp(16px, 4vw, 44px);
  --shell-max: 1240px;
  --head-max: 1420px;
  --shadow-lift: 0 18px 44px rgba(0, 0, 0, 0.42);
}

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

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

body {
  margin: 0;
  background: var(--ink-0);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: var(--step-0);
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.025em;
}

p { margin: 0 0 1em; }

a { color: var(--lime); text-decoration-thickness: 1px; text-underline-offset: 3px; }

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

ul, ol { margin: 0; padding: 0; }

button { font: inherit; color: inherit; }

::selection { background: var(--lime); color: var(--ink-0); }

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 外壳：页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(7, 23, 19, 0.98), rgba(14, 42, 34, 0.94));
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-shell {
  width: 100%;
  max-width: var(--head-max);
  margin-inline: auto;
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(10px, 1.6vw, 32px);
  min-height: 74px;
}

.brand-cluster {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  text-decoration: none;
  color: var(--paper);
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-0);
  background: var(--lime);
  padding: 4px 7px 5px;
  border-radius: 9px;
  transform: rotate(-4deg) translateY(-1px);
  display: inline-block;
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

.brand-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.09em;
  color: var(--muted);
  white-space: nowrap;
}

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

.nav-stair {
  list-style: none;
  display: flex;
  align-items: center;
  gap: clamp(4px, 0.9vw, 14px);
  margin: 0;
  padding: 0;
}

.stair-item {
  --stair: 0;
  transform: translateY(calc(var(--stair) * 2px));
  transition: transform 0.35s ease;
}

.stair-item:nth-child(1) { --stair: 0; }
.stair-item:nth-child(2) { --stair: 1; }
.stair-item:nth-child(3) { --stair: 2; }
.stair-item:nth-child(4) { --stair: 3; }
.stair-item:nth-child(5) { --stair: 4; }
.stair-item:nth-child(6) { --stair: 5; }

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color 0.22s ease, background-color 0.22s ease, border-color 0.22s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.22s ease;
}

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

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--lime);
  border-color: rgba(200, 255, 61, 0.45);
  background: rgba(200, 255, 61, 0.06);
}

.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index { color: var(--lime); }

.nav-link[aria-current="page"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink-0);
}

.nav-link[aria-current="page"] .nav-index { color: rgba(7, 23, 19, 0.62); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--lime);
  background: rgba(200, 255, 61, 0.07);
  color: var(--lime);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.22s ease, color 0.22s ease, box-shadow 0.22s ease;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: var(--lime);
  color: var(--ink-0);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.14);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-soft);
  background: rgba(30, 59, 49, 0.6);
  color: var(--paper);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.22s ease, color 0.22s ease;
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
  height: 14px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

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

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

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(142, 166, 156, 0.16);
  overflow: hidden;
}

.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--lime), var(--lime-soft));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--lime);
  color: var(--ink-0);
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 10px;
  outline: 2px solid var(--paper);
  outline-offset: 2px;
}

/* ---------- 外壳：页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: var(--ink-2);
  border-top: 1px solid var(--line-soft);
  padding-block: clamp(38px, 6vw, 76px) 22px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--lime) 22%, var(--alert) 22%, var(--alert) 28%, rgba(142, 166, 156, 0.22) 28%, rgba(142, 166, 156, 0.22) 100%);
}

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

.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1.05fr) minmax(0, 2fr) minmax(230px, 0.95fr);
  gap: clamp(24px, 3.6vw, 60px);
  align-items: start;
}

.footer-brand-name {
  margin: 0 0 6px;
  font-size: clamp(1.7rem, 1.2rem + 1.6vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--paper);
}

.footer-brand-tag {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.footer-note {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 30ch;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 34px);
}

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

.footer-col-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-link {
  display: inline-block;
  color: var(--paper);
  font-size: 0.92rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

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

.footer-contact-list {
  list-style: none;
  display: grid;
  gap: 14px;
  margin-bottom: 16px;
}

.footer-contact-item { display: grid; gap: 2px; }

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-contact-value {
  color: var(--paper);
  font-size: 0.94rem;
  line-height: 1.6;
  word-break: break-word;
}

.copy-btn {
  border: 1px solid var(--line-soft);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  padding: 2px 8px 3px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.copy-btn:hover,
.copy-btn:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(200, 255, 61, 0.08);
}

.copy-btn[data-copied="true"] {
  color: var(--ink-0);
  background: var(--lime);
  border-color: var(--lime);
}

.footer-bottom {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 16px;
  border-top: 1px solid rgba(142, 166, 156, 0.2);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 通用内容组件 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack { display: grid; gap: clamp(16px, 2.4vw, 30px); }

.grid-split {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(14px, 2vw, 26px);
}

.band {
  border-radius: var(--radius-l);
  background: var(--ink-1);
  border: 1px solid var(--line-lime);
  padding: clamp(20px, 3vw, 40px);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.display {
  font-size: var(--step-4);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 800;
  margin: 0 0 0.35em;
}

.lede {
  font-size: var(--step-1);
  line-height: 1.8;
  color: rgba(243, 246, 238, 0.82);
  max-width: 46ch;
  margin: 0 0 1em;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 2vw, 22px);
  margin-bottom: clamp(16px, 2.4vw, 30px);
  flex-wrap: wrap;
}

.section-num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 4.4rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(200, 255, 61, 0.55);
  display: inline-block;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.btn--primary { background: var(--lime); color: var(--ink-0); }
.btn--primary:hover,
.btn--primary:focus-visible { background: var(--lime-soft); box-shadow: 0 0 0 5px rgba(200, 255, 61, 0.16); }

.btn--ghost {
  background: rgba(243, 246, 238, 0.03);
  border-color: rgba(243, 246, 238, 0.28);
  color: var(--paper);
}
.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--lime); color: var(--lime); }

.btn--alert { background: var(--alert); color: #1a0703; }
.btn--alert:hover,
.btn--alert:focus-visible { background: #ff7a61; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 1.5;
  white-space: nowrap;
}

.tag--lime { background: var(--lime); color: var(--ink-0); }
.tag--soft { background: var(--lime-soft); color: #1d2a08; }
.tag--alert { background: rgba(255, 90, 60, 0.12); color: var(--alert); border: 1px solid rgba(255, 90, 60, 0.5); }
.tag--mute { background: rgba(142, 166, 156, 0.14); color: var(--muted); }
.tag--outline {
  background: transparent;
  border: 1px solid var(--paper);
  color: var(--paper);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.countdown {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 90, 60, 0.45);
  background: rgba(255, 90, 60, 0.1);
  color: var(--alert);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.countdown::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--alert);
  animation: ho-pulse 2.6s ease-in-out infinite;
}

@keyframes ho-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

.card {
  background: var(--ink-3);
  border: 1px solid var(--line-lime);
  border-radius: var(--radius-l);
  padding: clamp(18px, 2.6vw, 30px);
  transition: box-shadow 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
}

.card:hover {
  border-color: rgba(200, 255, 61, 0.45);
  box-shadow: var(--shadow-lift);
}

.breadcrumb { padding-block: clamp(14px, 2vw, 22px); }

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.breadcrumb-list li { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb-list li + li::before {
  content: "/";
  color: rgba(142, 166, 156, 0.45);
}

.breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb-link:hover,
.breadcrumb-link:focus-visible { color: var(--lime); }

.breadcrumb-list [aria-current="page"] { color: var(--lime); }

.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--radius-l);
  background: linear-gradient(140deg, var(--ink-3), var(--ink-1));
  aspect-ratio: 16 / 10;
  box-shadow: inset 0 0 0 1px rgba(200, 255, 61, 0.14);
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame--tilt { transform: rotate(-1.6deg); }

.media-caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 显现动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s cubic-bezier(0.2, 0.7, 0.2, 1), transform 0.55s cubic-bezier(0.2, 0.7, 0.2, 1);
  will-change: opacity, transform;
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1079px) {
  .nav-toggle { display: inline-flex; }

  .site-header { position: sticky; }

  .header-shell { min-height: 66px; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    padding: 14px var(--gutter) 20px;
    background: linear-gradient(180deg, #0b211a, var(--ink-0));
    border-bottom: 1px solid var(--line-soft);
    box-shadow: 0 26px 44px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.26s ease, transform 0.26s ease, visibility 0.26s ease;
  }

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

  .nav-stair {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .stair-item { transform: none; }

  .nav-link {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 12px;
    padding: 13px 16px;
    border-radius: var(--radius-m);
    font-size: 1rem;
    border-color: rgba(142, 166, 156, 0.16);
  }

  .nav-index { font-size: 0.66rem; }
}

@media (max-width: 980px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-note { max-width: 46ch; }

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

@media (max-width: 620px) {
  .brand-name { font-size: 1.12rem; }
  .brand-tag { font-size: 0.6rem; letter-spacing: 0.06em; }
  .header-cta { padding: 8px 11px; font-size: 0.76rem; }
  .nav-toggle { padding: 8px 10px; }
  .nav-toggle-text { display: none; }
  .footer-columns { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .display { font-size: clamp(2.2rem, 11vw, 3.4rem); }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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

  .stair-item,
  .media-frame--tilt { transform: none; }
}