/* 墨纸 · E-Ink 哑光高对比慢读版式 */

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

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

body {
  margin: 0;
  background: #fdfbf7;
  color: #1a1a1a;
  font-family: Georgia, "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: .004em;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: .05;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
p { margin: 0; }

h1, h2, h3, dt, .brand, .cta-btn, .strip, nav a, .side a,
.foot-kw, .foot-host, .foot-bar {
  font-family: Outfit, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

/* 顶部细条 */
.strip {
  background: #1a1a1a;
  color: #fdfbf7;
}
.strip-in {
  max-width: 1100px;
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .16em;
  text-align: center;
  line-height: 1.4;
}

/* 品牌行 */
.head-top {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px 14px;
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 4px 0;
  text-decoration: none;
  color: #1a1a1a;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .03em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  border: 1.5px solid #1a1a1a;
  border-radius: 4px;
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  background: #1a1a1a;
  border-radius: 1px;
}
.brand-img { width: 26px; height: 26px; }

.brand:hover .brand-mark { background: #1a1a1a; }
.brand:hover .brand-mark::after { background: #fdfbf7; }

/* 导航 */
.nav { border-top: 1px solid #e0e0e0; }
.nav ol {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid #1a1a1a;
  counter-reset: n;
}
.nav li { counter-increment: n; }
.nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 14px;
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  color: #1a1a1a;
  border-bottom: 2px solid transparent;
}
.nav a::before {
  content: counter(n, decimal-leading-zero);
  font-size: 10px;
  letter-spacing: .1em;
  color: #9a9a9a;
  margin-right: 8px;
}
.nav a:hover { background: #f5f5f5; border-bottom-color: #1a1a1a; }

/* 首屏 */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid #1a1a1a;
}
.hero-in {
  max-width: 1100px;
  margin: 0 auto;
  padding: 54px 24px 52px;
  min-height: 62vh;
  display: flex;
  align-items: center;
  gap: 36px;
}
.hero-fig {
  margin: 0;
  flex: 0 0 108px;
  width: 108px;
  height: 144px;
  border: 1px solid #1a1a1a;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(255, 255, 255, .5);
  backdrop-filter: blur(5px);
}
.hero-fig span {
  display: block;
  width: 18px;
  height: 18px;
  margin: 20px auto 0;
  background: #1a1a1a;
  border-radius: 2px;
}
.hero-img { width: 100%; height: 100%; object-fit: cover; }

.hero-copy { flex: 1 1 auto; text-align: right; }
.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(27px, 4.6vw, 46px);
  line-height: 1.26;
  font-weight: 600;
  letter-spacing: -.012em;
}
.hero-lead {
  margin: 0 0 0 auto;
  max-width: 52ch;
  color: #3d3d3d;
  font-size: 16px;
  line-height: 1.72;
}

.hero-num {
  position: absolute;
  right: 10px;
  bottom: -14px;
  z-index: 0;
  font-size: clamp(120px, 25vw, 290px);
  font-weight: 700;
  line-height: .78;
  letter-spacing: -.045em;
  color: #1a1a1a;
  pointer-events: none;
}
.hero-num span {
  position: absolute;
  right: 0;
  bottom: 0;
  opacity: 0;
  animation: numswap 21s linear infinite;
}
.hero-num span:nth-child(1) { opacity: 1; }
.hero-num span:nth-child(2) { animation-delay: 7s; }
.hero-num span:nth-child(3) { animation-delay: 14s; }

@keyframes numswap {
  0%, 33.32% { opacity: 1; }
  33.33%, 100% { opacity: 0; }
}

/* 正文区 */
.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 44px 24px 84px;
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 46px;
  align-items: start;
}

.side { position: sticky; top: 22px; }
.side-card {
  background: rgba(255, 255, 255, .55);
  backdrop-filter: blur(6px) saturate(1.1);
  border: 1px solid #e0e0e0;
  border-radius: 10px;
  padding: 16px 14px 14px;
}
.side small {
  display: block;
  font-family: Outfit, "PingFang SC", sans-serif;
  font-size: 11px;
  letter-spacing: .24em;
  color: #9a9a9a;
  margin-bottom: 4px;
}
.side h2 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .02em;
}
.side ul {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid #1a1a1a;
}
.side li { border-bottom: 1px solid #e6e6e6; }
.side a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 7px 2px;
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  color: #4a4a4a;
  border-left: 2px solid transparent;
  padding-left: 8px;
}
.side a:hover { color: #1a1a1a; background: #f5f5f5; }
.side a[aria-current="true"] {
  color: #1a1a1a;
  font-weight: 600;
  border-left-color: #1a1a1a;
}

.paper { border-top: 2px solid #1a1a1a; padding-top: 8px; min-width: 0; }

.body { display: block; }

.body section {
  padding: 36px 0 30px;
  border-bottom: 1px solid #e0e0e0;
  scroll-margin-top: 24px;
}
.body section:last-child { border-bottom: 0; padding-bottom: 8px; }

.body h2 {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.5vw, 26px);
  line-height: 1.38;
  font-weight: 600;
  letter-spacing: -.008em;
}
.body h3 {
  margin: 26px 0 10px;
  font-size: 18px;
  line-height: 1.5;
  font-weight: 600;
}
.body p { margin: 0 0 16px; max-width: 66ch; }
.body ul, .body ol { margin: 0 0 16px; padding-left: 1.3em; }
.body li { margin: 0 0 6px; max-width: 64ch; }
.body blockquote {
  margin: 0 0 18px;
  padding: 6px 0 6px 18px;
  border-left: 2px solid #1a1a1a;
  color: #3d3d3d;
  background: #f5f5f5;
}
.body a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.body a:hover { background: #1a1a1a; color: #fdfbf7; text-decoration: none; }
.body img { border: 1px solid #e0e0e0; border-radius: 10px; margin: 0 0 16px; }
.body hr { border: 0; border-top: 1px solid #e0e0e0; margin: 26px 0; }
.body code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 15px; background: #f5f5f5; padding: 1px 5px; border-radius: 3px; }

/* 页脚 */
.foot { border-top: 2px solid #1a1a1a; background: #f5f5f5; }

.foot-cta { background: #1a1a1a; color: #fdfbf7; }
.foot-cta-in {
  max-width: 1100px;
  margin: 0 auto;
  padding: 58px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}
.cta-line {
  margin: 0;
  font-size: clamp(25px, 5.4vw, 50px);
  line-height: 1.14;
  font-weight: 600;
  letter-spacing: -.02em;
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  min-height: 52px;
  padding: 13px 26px;
  border: 1px solid #fdfbf7;
  border-radius: 10px;
  color: #fdfbf7;
  text-decoration: none;
  font-size: 15px;
  letter-spacing: .1em;
}
.cta-btn:hover { background: #fdfbf7; color: #1a1a1a; }

.foot-cols {
  max-width: 1100px;
  margin: 0 auto;
  padding: 44px 24px 34px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) 1.3fr;
  gap: 26px;
}
.foot-cols dl { margin: 0; }
.foot-cols dt {
  font-size: 11px;
  letter-spacing: .22em;
  color: #9a9a9a;
  margin-bottom: 8px;
}
.foot-cols dd { margin: 0; }
.foot-cols dd a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 4px 0;
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  color: #1a1a1a;
  border-bottom: 1px solid transparent;
}
.foot-cols dd a:hover { border-bottom-color: #1a1a1a; }

.foot-note p { margin: 0 0 6px; }
.foot-kw {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.6;
}
.foot-host { font-size: 13px; color: #6f6f6f; letter-spacing: .04em; }

.foot-bar {
  border-top: 1px solid #e0e0e0;
  padding: 20px 24px 26px;
  text-align: center;
  font-size: 13px;
  color: #6f6f6f;
  letter-spacing: .05em;
}
.foot-bar p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-num span { animation: none; opacity: 0; }
  .hero-num span:nth-child(1) { opacity: 1; }
}

/* 移动端 */
@media (max-width: 760px) {
  body { font-size: 16.5px; }

  .strip-in { font-size: 11px; letter-spacing: .12em; padding: 8px 16px; }
  .head-top { padding: 10px 16px; }
  .brand { font-size: 17px; }
  .nav ol { padding: 0 12px; }
  .nav a { min-height: 42px; padding: 9px 10px; font-size: 13px; }
  .nav a::before { margin-right: 6px; }

  .hero-in {
    min-height: 0;
    padding: 26px 16px 30px;
    gap: 16px;
  }
  .hero-fig { display: none; }
  .hero-copy { text-align: left; }
  .hero-copy h1 { font-size: clamp(24px, 7.4vw, 32px); margin-bottom: 12px; }
  .hero-lead { font-size: 15px; max-width: none; }
  .hero-num { font-size: clamp(96px, 34vw, 170px); bottom: -10px; }

  .wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 26px 16px 56px;
  }
  .side { position: static; order: 2; }
  .paper { order: 1; }
  .side-card { padding: 14px 12px; }
  .side a { min-height: 42px; font-size: 14px; }

  .body section { padding: 28px 0 24px; }

  .foot-cta-in { padding: 38px 16px; }
  .cta-btn { width: 100%; justify-content: center; }
  .foot-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
    padding: 34px 16px 24px;
  }
  .foot-note { grid-column: 1 / -1; }
  .foot-note p { min-height: 40px; display: flex; align-items: center; }
  .foot-bar { padding: 18px 16px 24px; }
}

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