/* 杭州鹿效科技有限公司 · 官网
   风格：Claude / Anthropic 气质 —— 米白纸感、衬线大字、细线分隔、无卡片、克制动效
   手写 CSS，零构建、零外链。字体全部走系统栈。 */

:root {
  --paper: #F0EDE4;
  --paper-hi: #FAF8F2;
  --paper-lo: #E8E4D8;

  --ink: #141413;
  --ink-2: #33312C;
  --ink-3: #6B665A;
  --ink-4: #918B7C;

  --line: #D8D2C2;
  --line-2: #C3BBA5;

  --clay: #C15F3C;
  --clay-deep: #A34E2E;

  --serif: Georgia, "Times New Roman", "Songti SC", "STSong", "SimSun",
    "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --gut: clamp(20px, 5vw, 56px);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a { color: inherit; text-decoration: none; }

h1, h2, h3, p, dl, dd, blockquote { margin: 0; }

::selection { background: var(--clay); color: var(--paper-hi); }

/* ---------- 通用容器 ---------- */

.wrap,
.nav-inner {
  width: 100%;
  max-width: 1232px;
  margin-inline: auto;
  padding-inline: var(--gut);
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 12px 18px;
  background: var(--ink);
  color: var(--paper-hi);
  font-size: 14px;
}
.skip:focus { left: 12px; top: 12px; }

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

/* ---------- 导航 ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background-color .4s var(--ease), box-shadow .4s var(--ease);
}
.nav.is-scrolled {
  background: rgba(240, 237, 228, .88);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  backdrop-filter: blur(14px) saturate(1.15);
  box-shadow: inset 0 -1px 0 var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 20px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 11px;
  flex: none;
}
.brand-cn {
  font-family: var(--serif);
  font-size: 19px;
  letter-spacing: .06em;
}
.brand-en {
  font-size: 10px;
  letter-spacing: .3em;
  color: var(--ink-4);
}

.nav-links {
  display: flex;
  gap: clamp(18px, 3vw, 38px);
  margin-left: auto;
  margin-right: clamp(18px, 3vw, 40px);
}
.nav-links a {
  position: relative;
  font-size: 14px;
  letter-spacing: .03em;
  color: var(--ink-3);
  transition: color .3s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 1px;
  background: var(--clay);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .45s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  flex: none;
  padding: 9px 17px;
  font-size: 13px;
  letter-spacing: .06em;
  border: 1px solid var(--ink);
  border-radius: 2px;
  transition: background-color .35s var(--ease), color .35s var(--ease);
}
.nav-cta:hover { background: var(--ink); color: var(--paper-hi); }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: clamp(112px, 14vh, 158px) 0 clamp(56px, 7vh, 80px);
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: min(72vw, 900px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(193, 95, 60, .07), transparent 62%);
  pointer-events: none;
}

.orbit {
  position: absolute;
  top: 50%;
  right: max(-11vw, -130px);
  width: min(37vw, 540px);
  aspect-ratio: 1;
  height: auto;
  transform: translateY(-53%);
  color: var(--clay);
  opacity: .62;
  pointer-events: none;
}
.orbit-beads {
  transform-box: view-box;
  transform-origin: 50% 50%;
  animation: spin 180s linear infinite;
}
.orbit-line {
  transform-box: view-box;
  transform-origin: 50% 50%;
  animation: spin-rev 240s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes spin-rev { to { transform: rotate(-360deg); } }

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.tick {
  width: 26px;
  height: 1px;
  background: var(--clay);
  flex: none;
}

.hero-title {
  margin-top: clamp(22px, 3vh, 34px);
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(44px, 5.2vw + 18px, 86px);
  line-height: 1.12;
  letter-spacing: -.01em;
  max-width: 15em;
}
.hero-title .line {
  display: block;
  overflow: hidden;
  padding-bottom: .06em;
  margin-bottom: -.06em;
}
.hero-title .line-in {
  display: inline-block;
  transform: translateY(112%);
  animation: rise 1s var(--ease) .1s forwards;
}
.hero-title .line:nth-child(2) .line-in { animation-delay: .24s; }

@keyframes rise { to { transform: translateY(0); } }

.hero-lead {
  margin-top: clamp(24px, 3.4vh, 34px);
  max-width: 34em;
  font-size: clamp(16px, .8vw + 10px, 18px);
  line-height: 1.85;
  color: var(--ink-2);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(30px, 4.2vh, 42px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 27px;
  font-size: 15px;
  letter-spacing: .04em;
  border-radius: 2px;
  border: 1px solid transparent;
  transition: background-color .35s var(--ease), border-color .35s var(--ease),
    color .35s var(--ease), transform .35s var(--ease);
}
.btn-solid { background: var(--ink); color: var(--paper-hi); }
.btn-solid:hover {
  background: var(--clay-deep);
  border-color: var(--clay-deep);
  transform: translateY(-1px);
}
.btn-line { border-color: var(--line-2); color: var(--ink); }
.btn-line:hover {
  border-color: var(--ink);
  background: rgba(20, 20, 19, .035);
  transform: translateY(-1px);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 clamp(24px, 4vw, 56px);
  margin-top: clamp(44px, 6.4vh, 64px);
  border-top: 1px solid var(--line);
  padding-top: 16px;
  max-width: 760px;
}
.fact dt {
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--ink-4);
}
.fact dd {
  margin-top: 6px;
  font-size: 15px;
  color: var(--ink-2);
  letter-spacing: .01em;
}

/* ---------- 主张 ---------- */

.statement {
  padding: clamp(64px, 9vw, 112px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-hi);
}
.statement-inner {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: clamp(16px, 4vw, 40px);
  align-items: start;
}
.statement-label {
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--clay);
  padding-top: 14px;
}
.statement blockquote {
  font-family: var(--serif);
  font-size: clamp(24px, 2.4vw + 14px, 42px);
  line-height: 1.48;
  letter-spacing: -.005em;
  max-width: 22em;
  line-break: strict;
}
.q-line { display: block; }

/* ---------- 分节 ---------- */

.section { padding: clamp(64px, 9vw, 116px) 0; }
.section-alt {
  background: var(--paper-hi);
  border-block: 1px solid var(--line);
}

.sec-head {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: clamp(16px, 4vw, 40px);
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line-2);
}
.sec-num {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--clay);
  padding-top: .7em;
}
.sec-head h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(29px, 2.2vw + 18px, 46px);
  line-height: 1.24;
  letter-spacing: -.005em;
}
.sec-desc {
  margin-top: 14px;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-3);
}

/* ---------- 能力 ---------- */

.cap-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.cap {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: clamp(16px, 4vw, 40px);
  padding: clamp(28px, 3.6vw, 40px) 0;
  border-bottom: 1px solid var(--line);
}
.cap:last-child { border-bottom: 0; padding-bottom: 0; }

.cap-idx,
.series-idx {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--ink-4);
  padding-top: .55em;
  transition: color .4s var(--ease);
}
.cap-idx::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 1px;
  background: var(--clay);
  vertical-align: middle;
  transition: width .45s var(--ease), margin-right .45s var(--ease);
}
.cap:hover .cap-idx { color: var(--clay); }
.cap:hover .cap-idx::before { width: 15px; margin-right: 9px; }

.cap-main h3,
.series-main h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(21px, 1.1vw + 15px, 28px);
  line-height: 1.4;
  letter-spacing: .01em;
}
.cap-main p,
.series-main p {
  margin-top: 11px;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}
.cap-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--ink-4);
  margin-top: 16px;
}
.cap-tags span { color: var(--line-2); }

/* ---------- 工作方式 ---------- */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 clamp(20px, 3vw, 40px);
  margin: clamp(32px, 4.4vw, 52px) 0 0;
  padding: 0;
}
.step {
  padding-top: 18px;
  border-top: 1px solid var(--line-2);
}
.step-idx {
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--clay);
}
.step h3 {
  margin-top: 14px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.5;
}
.step p {
  margin-top: 9px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-3);
}

/* ---------- 边界 ---------- */

.boundary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(28px, 6vw, 88px);
  margin-top: clamp(32px, 4.4vw, 48px);
}
.bcol h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 20px;
  letter-spacing: .02em;
}
.blist {
  list-style: none;
  margin-top: 18px;
  padding: 0;
}
.blist li {
  position: relative;
  padding: 13px 0 13px 26px;
  border-top: 1px solid var(--line);
  font-size: 15.5px;
  color: var(--ink-2);
}
.blist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 13px;
  height: 1px;
  background: var(--clay);
}
.bcol-no h3 { color: var(--ink-3); }
.blist-no li { color: var(--ink-3); }
.blist-no li::before { background: var(--line-2); }

/* ---------- 图版 ---------- */

.plate {
  margin: clamp(30px, 4.2vw, 48px) 0 0;
}
.plate img {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  object-position: 38% 50%;
  border: 1px solid var(--line);
  background: var(--paper-lo);
}
.plate figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--ink-4);
}

/* ---------- 款式列表 ---------- */

.series {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
}
.series-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) 190px;
  gap: clamp(16px, 4vw, 40px);
  padding: clamp(26px, 3.4vw, 36px) 0;
  border-top: 1px solid var(--line);
  align-items: start;
}
.series-item:last-child { padding-bottom: 0; }
.series-thumb {
  margin: 0;
  width: 100%;
}
.series-thumb img {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--paper-lo);
}

.series-main .series-spec {
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--ink-4);
  font-variant-numeric: tabular-nums;
}

/* ---------- 关于 ---------- */

.section-about { border-top: 1px solid var(--line); }
.about {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: clamp(16px, 4vw, 40px);
}
.about-label {
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--clay);
  padding-top: .5em;
}
.about-lead {
  font-family: var(--serif);
  font-size: clamp(21px, 1.1vw + 15px, 30px);
  line-height: 1.6;
  max-width: 24em;
  text-wrap: pretty;
}
.about-text {
  margin-top: 22px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-2);
}
.facts {
  margin-top: clamp(34px, 4.6vw, 48px);
  border-top: 1px solid var(--line);
  max-width: 46em;
}
.fact-row {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.fact-row dt {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--ink-4);
  padding-top: 2px;
}
.fact-row dd {
  font-size: 15.5px;
  color: var(--ink-2);
}

/* ---------- 开始之前 ---------- */

.start {
  background: var(--clay-deep);
  color: #F7F5EF;
  padding: clamp(64px, 8.5vw, 116px) 0;
}
.start-label {
  font-size: 11px;
  letter-spacing: .26em;
  color: rgba(247, 245, 239, .64);
}
.start-title {
  margin-top: 20px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(29px, 2.4vw + 20px, 54px);
  line-height: 1.32;
  letter-spacing: -.005em;
  max-width: 22em;
  text-wrap: pretty;
}
.start-lead {
  margin-top: 26px;
  max-width: 40em;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(247, 245, 239, .84);
}
.start-steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 clamp(20px, 3vw, 44px);
  margin: clamp(38px, 5vw, 58px) 0 0;
  padding: 0;
}
.start-steps li {
  border-top: 1px solid rgba(247, 245, 239, .3);
  padding-top: 16px;
}
.s-idx {
  font-size: 11px;
  letter-spacing: .24em;
  color: rgba(247, 245, 239, .66);
}
.start-steps p {
  margin-top: 10px;
  font-size: 15.5px;
  line-height: 1.7;
  color: #F7F5EF;
}

/* ---------- 页脚 ---------- */

.foot {
  background: var(--paper);
  border-top: 1px solid var(--line);
  padding: 42px 0 50px;
}
.foot-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
}
.foot-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.foot-brand .brand-cn { font-size: 20px; }
.foot-meta {
  text-align: right;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-3);
}
.foot-corp { color: var(--ink-2); }
.foot-meta p + p { margin-top: 6px; }
.foot-icp {
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--ink-2);
  border-bottom: 1px solid var(--line-2);
  transition: color .3s var(--ease), border-color .3s var(--ease);
}
.foot-icp:hover {
  color: var(--clay-deep);
  border-color: var(--clay);
}
.foot-note {
  max-width: 34em;
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-3);
}
.foot-copy {
  margin-top: 4px;
  font-size: 12px;
  color: var(--ink-4);
}

/* ---------- 入场 ---------- */

/* 入场：只用位移，不使用 opacity:0 ——
   备案站的内容必须在任何情况下都读得到（脚本失败 / 观察器不触发 / 自动化截图停留首屏），
   用隐藏换来的淡入不值得。 */
.js .reveal {
  transform: translateY(16px);
  transition: transform .9s var(--ease);
}
.js .reveal.in { transform: none; }

/* ---------- 响应式 ---------- */

@media (max-width: 1000px) {
  .orbit {
    right: max(-24vw, -220px);
    width: min(64vw, 560px);
    opacity: .3;
  }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px clamp(20px, 4vw, 40px); }
}

@media (max-width: 860px) {
  html { scroll-padding-top: 78px; }
  .nav-links { display: none; }
  .nav-cta { margin-left: auto; }
  .nav-inner { padding-block: 16px; }

  .hero { padding-top: 104px; }
  .orbit {
    top: 8%;
    right: -30vw;
    width: 88vw;
    transform: none;
    opacity: .18;
  }
  .hero::after { inset: -10% -30% auto auto; }

  .statement-inner,
  .sec-head,
  .cap,
  .about {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .statement-label,
  .sec-num,
  .cap-idx,
  .about-label { padding-top: 0; }
  .statement blockquote { max-width: none; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .hero-facts {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 0;
  }
  .fact {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 18px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }
  .fact dt { flex: none; font-size: 10.5px; }
  .fact dd { margin-top: 0; font-size: 14.5px; text-align: right; }

  /* 手机上保持三行断句，只把字号收到能放下最长一句的大小——
     让浏览器自然换取会把「三五年」「能读懂」拆开，比小一号字难看得多。 */
  .statement blockquote { font-size: 21px; line-height: 1.66; max-width: none; }
  .q-line { display: block; }

  .steps { grid-template-columns: 1fr; gap: 0; }
  .step { padding: 16px 0 22px; }
  .step h3 { font-size: 18px; }

  .plate img { aspect-ratio: 4 / 3; object-position: 42% 50%; }

  .series-item {
    grid-template-columns: minmax(0, 1fr) 96px;
    gap: 6px 18px;
  }
  .series-idx { grid-column: 1 / -1; padding-top: 0; }
  .series-main { grid-column: 1; grid-row: 2; }
  .series-thumb { grid-column: 2; grid-row: 2; }
  .series-item:last-child { padding-bottom: 0; }

  .boundary { grid-template-columns: 1fr; gap: 34px; }

  .start-steps { grid-template-columns: 1fr; gap: 0; }
  .start-steps li { padding: 14px 0 18px; }

  .foot-inner { flex-direction: column; align-items: flex-start; }
  .foot-meta { text-align: left; }

  .br-desk { display: none; }

  .hero-actions .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .hero-title .line-in { transform: none; }
  .js .reveal { transform: none; }
}

/* 360px 级窄屏（部分安卓机）：标题与引用各降一档，避免断行失控 */
@media (max-width: 380px) {
  .hero-title { font-size: 38px; }
  .statement blockquote { font-size: 19px; }
  .hero-actions { gap: 10px; }
  .btn { padding: 14px 18px; font-size: 14px; }
}