@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@700&display=swap');

:root {
  --cream: #F5EFDF;
  --cream-2: #EFE6D0;
  --ink: #111111;
  --zap: #E8FF3A;
  --rail: 244px;
  --dock: 78px;
  --r: 10px;
}

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

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

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: "Space Grotesk", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
}

img { max-width: 100%; }

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}

/* ---------- 角落品牌标记 ---------- */
.mark {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 90;
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  border-radius: 12px;
  background: var(--zap);
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  box-shadow: 4px 4px 0 var(--ink);
}
.mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 9px;
  display: block;
}

/* ---------- 左侧栏 ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 82px 16px calc(var(--dock) + 22px);
  background: var(--cream);
  border-right: 2px solid var(--ink);
  overflow-y: auto;
}

.rail-title {
  margin: 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .18em;
}

.rail nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rail nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border: 2px solid transparent;
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}
.rail nav a:hover,
.rail nav a:focus-visible {
  background: var(--zap);
  border-color: var(--ink);
  transform: translateX(2px);
}

/* ---------- 主区 ---------- */
main {
  margin-left: var(--rail);
  min-width: 0;
}

/* ---------- 首屏 ---------- */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  align-items: stretch;
  padding-bottom: var(--dock);
}

.hero-media {
  background: var(--zap);
  border-right: 2px solid var(--ink);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 26px;
  min-height: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  max-height: 68vh;
  object-fit: cover;
  border: 2px solid var(--ink);
  border-radius: var(--r);
  display: block;
  will-change: transform;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  text-align: right;
  padding: 44px 30px 44px 26px;
  min-width: 0;
}

.hero-h1 {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 5rem);
  line-height: 1.03;
  letter-spacing: -.035em;
  font-weight: 700;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

.ch {
  display: inline-block;
  opacity: 0;
  transform: translateY(.55em) rotate(6deg);
  animation: chIn .62s cubic-bezier(.2, .85, .25, 1) forwards;
  animation-delay: calc(var(--i, 0) * 38ms);
  white-space: pre;
}
@keyframes chIn {
  to { opacity: 1; transform: none; }
}

.hero-desc {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: 17px;
  line-height: 1.65;
  color: #2a2a26;
}

/* ---------- 正文壳 ---------- */
.wrap {
  padding: 0 30px calc(var(--dock) + 46px);
  max-width: 1000px;
}

.shell { display: block; }

.prose {
  display: block;
}

.prose div {
  padding: 56px 0;
  border-top: 2px solid var(--ink);
  scroll-margin-top: 18px;
}
.prose div:first-child { border-top: 0; padding-top: 44px; }
.prose div:nth-child(even) {
  background: var(--cream-2);
  margin: 0 -30px;
  padding-left: 30px;
  padding-right: 30px;
}

.prose h2 {
  margin: 0 0 .55em;
  font-size: clamp(1.45rem, 3.1vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -.022em;
  font-weight: 700;
}
.prose h3 {
  margin: 1.7em 0 .5em;
  font-size: clamp(1.1rem, 2.1vw, 1.42rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  font-weight: 700;
}

.prose h2 > span,
.prose h3 > span,
.rail-title > span,
.foot-h > span {
  background-image: linear-gradient(var(--zap), var(--zap));
  background-repeat: no-repeat;
  background-size: 100% .4em;
  background-position: 0 86%;
  padding: 0 .08em;
}

.prose p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.78;
}
.prose ul, .prose ol { margin: 0 0 1.1em; padding-left: 1.35em; }
.prose li { margin: .38em 0; }
.prose li::marker { color: var(--ink); font-weight: 700; }
.prose strong { font-weight: 700; }

.prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  background: var(--zap);
  padding: 0 .1em;
}
.prose a:hover { background: var(--ink); color: var(--zap); }

.prose blockquote {
  margin: 0 0 1.2em;
  padding: 14px 18px;
  border-left: 6px solid var(--ink);
  background: #fff;
  border-radius: 0 var(--r) var(--r) 0;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.2em;
  font-size: 16px;
}
.prose th, .prose td {
  border: 2px solid var(--ink);
  padding: 8px 10px;
  text-align: left;
}
.prose th { background: var(--zap); }
.prose code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 15px;
  background: #fff;
  border: 1px solid var(--ink);
  border-radius: 4px;
  padding: 0 4px;
}

/* ---------- 滚动渐显 ---------- */
html.js .prose div.rv {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .52s ease, transform .52s cubic-bezier(.2, .85, .25, 1);
}
html.js .prose div.rv.in {
  opacity: 1;
  transform: none;
}

/* ---------- 页脚 ---------- */
.foot {
  border-top: 2px solid var(--ink);
  max-width: 1000px;
  padding: 42px 30px calc(var(--dock) + 34px);
  display: block;
}

.foot-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px 24px;
  background: var(--zap);
  border: 2px solid var(--ink);
  border-bottom-width: 8px;
  border-radius: var(--r);
}

.foot-h {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  font-weight: 700;
}

.foot-go {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 26px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--zap);
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
}
.foot-go:hover { background: var(--cream); color: var(--ink); }

.foot-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding-top: 24px;
  margin-top: 26px;
  border-top: 2px dashed var(--ink);
}
.foot-bar address {
  font-style: normal;
  font-weight: 700;
  font-size: 16px;
}
.foot-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
}
.foot-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--ink);
  font-size: 16px;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.foot-links a:hover { background: var(--zap); }
.copy {
  margin: 0 0 0 auto;
  font-size: 16px;
}

/* ---------- 底部固定条 ---------- */
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  height: var(--dock);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--cream);
  border-top: 2px solid var(--ink);
}

.dock nav {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.dock nav::-webkit-scrollbar { display: none; }

.dock nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.dock nav a {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 16px;
  white-space: nowrap;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--cream);
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: background .16s ease, color .16s ease;
}
.dock nav a:hover,
.dock nav a:focus-visible {
  background: var(--zap);
}

.dock .cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--zap);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 3px 3px 0 var(--zap);
}
.dock .cta:hover { background: var(--zap); color: var(--ink); box-shadow: 3px 3px 0 var(--ink); }

/* ---------- 窄屏 ---------- */
@media (max-width: 880px) {
  .rail { display: none; }
  main { margin-left: 0; }

  .mark { top: 12px; left: 12px; width: 44px; height: 44px; }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 68px;
    min-height: 100svh;
  }
  .hero-media {
    border-right: 0;
    border-bottom: 2px solid var(--ink);
    height: 40svh;
    min-height: 210px;
    padding: 16px;
  }
  .hero-media img { max-height: 100%; }
  .hero-copy {
    text-align: right;
    align-items: flex-end;
    padding: 26px 18px 34px;
    flex: 1;
  }
  .hero-h1 { font-size: clamp(1.9rem, 9.5vw, 3rem); }
  .hero-desc { font-size: 16px; }

  .wrap { padding: 0 18px calc(var(--dock) + 34px); }
  .prose div { padding: 42px 0; }
  .prose div:nth-child(even) { margin: 0 -18px; padding-left: 18px; padding-right: 18px; }

  .foot { padding: 32px 18px calc(var(--dock) + 28px); }
  .copy { margin-left: 0; width: 100%; }

  .dock { padding: 8px 12px; gap: 8px; }
  .dock nav a { min-height: 44px; padding: 0 13px; font-size: 16px; }
  .dock .cta { min-height: 46px; padding: 0 15px; }
}

@media (max-width: 420px) {
  .hero-desc { display: block; }
  .foot-cta { padding: 20px 16px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .ch { opacity: 1 !important; transform: none !important; }
  html.js .prose div.rv { opacity: 1 !important; transform: none !important; }
}

button[aria-expanded]{min-width:44px;min-height:44px}