/* ============================================================
   page-home —— 首页专属样式（全部限定在 .page-home 作用域内）
   ============================================================ */

.page-home{
  background: var(--yw-graphite);
  color: var(--yw-paper);
  overflow-x: hidden;
  overflow-x: clip;
}

.page-home .yw-wrap{ position: relative; }

/* ---------- 色带分隔 ---------- */
.page-home .ph-band{
  height: 4px;
  margin: 0 var(--yw-gutter);
  border-radius: var(--yw-radius);
  background:
    linear-gradient(90deg,
      var(--yw-signal) 0 16%,
      transparent 16% 20%,
      var(--yw-electric) 20% 44%,
      transparent 44% 48%,
      var(--yw-signal) 48% 62%,
      transparent 62% 66%,
      var(--yw-electric) 66% 100%);
  opacity: .8;
}

/* ============================================================
   首屏：目录 + 材质特写
   ============================================================ */
.page-home .ph-hero{
  padding-top: clamp(26px, 4.6vw, 62px);
  background:
    radial-gradient(115% 85% at 90% -6%, rgba(46,155,255,.11), transparent 62%),
    radial-gradient(85% 70% at 2% 22%, rgba(255,106,26,.09), transparent 62%),
    var(--yw-graphite);
}

.page-home .ph-hero__grid{
  display: grid;
  gap: clamp(26px, 4vw, 54px);
  align-items: start;
}

.page-home .ph-hero__lede .yw-kicker{
  color: var(--yw-signal);
  margin: 0 0 14px;
  display: block;
}

.page-home .ph-hero__lede .yw-h1{
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(29px, 5vw, 58px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--yw-paper);
  max-width: 22ch;
}

.page-home .ph-hero__lede .yw-lead{
  margin: 0;
  max-width: 34em;
  font-size: clamp(14.5px, 1.12vw, 17px);
  line-height: 1.85;
  color: rgba(241,237,228,.76);
}

.page-home .ph-hero__fig{
  margin: 0;
  width: 100%;
}

.page-home .ph-hero__fig img{
  display: block;
  width: 100%;
  height: auto;
}

/* 目录索引 */
.page-home .ph-index{
  list-style: none;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--yw-line);
}

.page-home .ph-index li{ border-bottom: 1px solid var(--yw-line); }

.page-home .ph-index a{
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  color: var(--yw-paper);
  text-decoration: none;
  transition: color .18s ease, padding-left .18s ease;
}

.page-home .ph-index a:hover,
.page-home .ph-index a:focus-visible{
  color: var(--yw-signal);
  padding-left: 6px;
}

.page-home .ph-index a.is-active{ color: var(--yw-signal); }

.page-home .ph-index a.is-active .ph-index__n{
  background: var(--yw-signal);
  border-color: var(--yw-signal);
  color: var(--yw-graphite);
}

.page-home .ph-index__n{
  flex: 0 0 auto;
  font-family: var(--yw-font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  line-height: 1;
  padding: 3px 6px;
  border: 1px solid var(--yw-line);
  border-radius: var(--yw-radius);
  color: var(--yw-muted);
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.page-home .ph-index__t{
  font-size: clamp(14px, 1.06vw, 16px);
}

/* 首屏数据条 */
.page-home .ph-tally{
  list-style: none;
  margin: clamp(30px, 4vw, 54px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  background: var(--yw-line);
  border: 1px solid var(--yw-line);
  border-radius: var(--yw-radius);
  overflow: hidden;
}

.page-home .ph-tally li{
  background: var(--yw-graphite-2);
  padding: 15px 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-home .ph-tally__n{
  font-family: var(--yw-font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.3vw, 28px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--yw-paper);
}

.page-home .ph-tally__l{
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--yw-muted);
}

/* ============================================================
   章节通用头部：大编号 + 标题
   ============================================================ */
.page-home .ph-head{
  display: grid;
  gap: 6px;
  margin-bottom: clamp(26px, 3.6vw, 52px);
}

.page-home .ph-num{
  display: block;
  font-family: var(--yw-font-mono);
  font-weight: 700;
  font-size: clamp(50px, 7vw, 104px);
  line-height: .8;
  letter-spacing: -.04em;
  color: rgba(255,106,26,.14);
  -webkit-text-stroke: 1px rgba(255,106,26,.55);
  margin-bottom: 2px;
}

.page-home .ph-head__txt .yw-h2{
  margin: 0 0 10px;
  font-size: clamp(21px, 2.9vw, 38px);
  line-height: 1.26;
  letter-spacing: -.015em;
  color: var(--yw-paper);
}

.page-home .ph-head__sub{
  margin: 0;
  max-width: 42em;
  font-size: clamp(14px, 1.04vw, 16px);
  line-height: 1.85;
  color: rgba(241,237,228,.66);
}

/* 纸感区内的头部配色 */
.page-home .yw-paper .ph-num{
  color: rgba(194,71,10,.12);
  -webkit-text-stroke-color: rgba(194,71,10,.5);
}

.page-home .yw-paper .ph-head__txt .yw-h2{ color: var(--yw-ink); }
.page-home .yw-paper .ph-head__sub{ color: var(--yw-paper-muted); }

/* 分栏容器 */
.page-home .ph-split{
  display: grid;
  gap: clamp(24px, 3.6vw, 48px);
  align-items: start;
}

/* ============================================================
   01 三条产品线
   ============================================================ */
.page-home .ph-lines{ background: var(--yw-graphite); }

.page-home .ph-lines__wide{ margin-top: clamp(26px, 4vw, 60px); }

.page-home .ph-line{
  padding: clamp(18px, 2.2vw, 26px) 0;
  border-top: 1px solid var(--yw-line);
}

.page-home .ph-lines__text .ph-line:last-child{ border-bottom: 1px solid var(--yw-line); }

.page-home .ph-line--wide{
  border-top: 1px solid var(--yw-line);
  border-bottom: 1px solid var(--yw-line);
}

.page-home p.ph-line__k{
  margin: 0 0 10px;
  font-family: var(--yw-font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--yw-signal);
}

.page-home .ph-line .yw-h3{
  margin: 0 0 10px;
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--yw-paper);
}

.page-home .ph-line p{
  margin: 0;
  font-size: clamp(14px, 1.02vw, 15.5px);
  line-height: 1.85;
  color: rgba(241,237,228,.72);
}

.page-home .ph-tags{
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-home .ph-tag{
  font-family: var(--yw-font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  line-height: 1;
  padding: 6px 10px;
  border: 1px solid rgba(46,155,255,.34);
  border-radius: var(--yw-radius);
  color: var(--yw-electric);
  background: rgba(46,155,255,.07);
}

.page-home .ph-lines__fig,
.page-home .ph-lines__fig2{
  margin: 0;
  width: 100%;
}

.page-home .ph-lines__fig img,
.page-home .ph-lines__fig2 img{
  display: block;
  width: 100%;
  height: auto;
}

/* ============================================================
   02 接口标准与核参数（纸感区）
   ============================================================ */
.page-home .ph-std{ position: relative; }

.page-home .ph-std__index{
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 40px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--yw-paper-line);
  border: 1px solid var(--yw-paper-line);
  border-radius: var(--yw-radius);
  overflow: hidden;
}

.page-home .ph-std__index li{
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: var(--yw-paper-2);
  font-size: 14px;
  color: var(--yw-ink);
  min-width: 0;
}

.page-home .ph-std__i{
  font-family: var(--yw-font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--yw-signal-deep);
  flex: 0 0 auto;
}

.page-home .ph-std__fig{
  margin: 0 0 clamp(20px, 2.6vw, 32px);
}

.page-home .ph-std__fig img{
  display: block;
  width: 100%;
  height: clamp(170px, 24vw, 330px);
  object-fit: cover;
  border-radius: var(--yw-radius);
}

.page-home .ph-tblWrap{
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--yw-paper-line);
  border-radius: var(--yw-radius);
  background: var(--yw-paper-2);
}

.page-home .ph-tblWrap:focus-visible{
  outline: 2px solid var(--yw-signal-deep);
  outline-offset: 2px;
}

.page-home .ph-tbl{
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-home .ph-tbl__cap{
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--yw-paper-muted);
  border-bottom: 1px solid var(--yw-paper-line);
}

.page-home .ph-tbl th,
.page-home .ph-tbl td{
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--yw-paper-line);
}

.page-home .ph-tbl thead th{
  font-family: var(--yw-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  font-weight: 500;
  color: var(--yw-paper-muted);
  background: var(--yw-paper);
}

.page-home .ph-tbl tbody th{
  font-weight: 600;
  font-size: 14px;
  color: var(--yw-electric-deep);
}

.page-home .ph-tbl tbody td{
  font-family: var(--yw-font-mono);
  font-size: 13.5px;
  color: var(--yw-ink);
}

.page-home .ph-tbl tbody tr:nth-child(even){ background: rgba(18,21,26,.035); }
.page-home .ph-tbl tbody tr:last-child th,
.page-home .ph-tbl tbody tr:last-child td{ border-bottom: 0; }

.page-home .ph-std__more{ margin: clamp(20px, 2.6vw, 32px) 0 0; }

.page-home .yw-paper .yw-btn--signal{
  background: var(--yw-signal-deep);
  border-color: var(--yw-signal-deep);
  color: #FFFFFF;
}

.page-home .ph-link{
  color: var(--yw-electric-deep);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============================================================
   03 年份脉络
   ============================================================ */
.page-home .ph-timeline{
  background: linear-gradient(180deg, var(--yw-graphite) 0%, var(--yw-graphite-2) 100%);
}

.page-home .ph-years{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-home .ph-years__item{
  display: grid;
  gap: 6px 24px;
  padding: clamp(18px, 2.4vw, 28px) 0;
  border-top: 1px solid var(--yw-line);
}

.page-home .ph-years__item:last-child{ border-bottom: 1px solid var(--yw-line); }

.page-home .ph-years__item--now{
  background: linear-gradient(90deg, rgba(255,106,26,.09), transparent 62%);
  padding-left: clamp(10px, 1.6vw, 20px);
  padding-right: clamp(10px, 1.6vw, 20px);
  border-left: 2px solid var(--yw-signal);
}

.page-home .ph-years__y{
  font-family: var(--yw-font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--yw-signal);
}

.page-home .ph-years__b .yw-h3{
  margin: 0 0 8px;
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.35;
  color: var(--yw-paper);
}

.page-home .ph-years__b p{
  margin: 0;
  font-size: clamp(13.8px, 1vw, 15.5px);
  line-height: 1.85;
  color: rgba(241,237,228,.68);
}

.page-home .ph-patent{
  margin-top: clamp(28px, 4vw, 52px);
  padding: clamp(22px, 2.8vw, 34px);
  max-width: 880px;
}

.page-home .ph-patent .yw-h3{
  margin: 0 0 10px;
  font-size: clamp(17px, 1.5vw, 21px);
  color: var(--yw-ink);
}

.page-home .ph-patent p{
  margin: 0 0 14px;
  font-size: clamp(14px, 1vw, 15.5px);
  line-height: 1.85;
  color: var(--yw-paper-muted);
}

.page-home .ph-patent p:last-child{ margin-bottom: 0; }

/* ============================================================
   04 询价流程
   ============================================================ */
.page-home .ph-flow{
  background: linear-gradient(180deg, var(--yw-graphite-2) 0%, var(--yw-graphite) 100%);
  border-top: 1px solid var(--yw-line);
}

.page-home .ph-steps{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--yw-line);
}

.page-home .ph-steps li{
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--yw-line);
}

.page-home .ph-steps__n{
  display: inline-block;
  font-family: var(--yw-font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--yw-signal);
  margin-bottom: 10px;
}

.page-home .ph-steps h3{
  margin: 0 0 8px;
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.35;
  color: var(--yw-paper);
}

.page-home .ph-steps p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(241,237,228,.7);
}

.page-home .ph-flow__acts{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 44px);
}

/* ============================================================
   05 常见疑问与最近登记
   ============================================================ */
.page-home .ph-qa{ background: var(--yw-graphite); }

.page-home .ph-q{ border-top: 1px solid var(--yw-line); }

.page-home .ph-q:last-child{ border-bottom: 1px solid var(--yw-line); }

.page-home .ph-q summary{
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 15px 36px 15px 0;
  font-size: clamp(14.5px, 1.08vw, 16px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--yw-paper);
  transition: color .18s ease;
}

.page-home .ph-q summary::-webkit-details-marker{ display: none; }

.page-home .ph-q summary:hover,
.page-home .ph-q summary:focus-visible{ color: var(--yw-signal); }

.page-home .ph-q summary::after{
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--yw-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--yw-signal);
}

.page-home .ph-q[open] summary::after{ content: "–"; }

.page-home .ph-q__a{
  padding: 0 36px 18px 0;
}

.page-home .ph-q__a p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(241,237,228,.72);
}

.page-home .ph-latest{
  border-left: 2px solid var(--yw-signal);
  padding-left: clamp(16px, 2vw, 26px);
}

.page-home .ph-latest__t{
  display: block;
  margin: 0 0 14px;
  color: var(--yw-muted);
}

.page-home .ph-latest__list{
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-home .ph-latest__list li{ border-top: 1px solid var(--yw-line); }

.page-home .ph-latest__list a{
  display: block;
  padding: 12px 0;
  text-decoration: none;
  color: var(--yw-paper);
  transition: color .18s ease;
}

.page-home .ph-latest__list a:hover,
.page-home .ph-latest__list a:focus-visible{ color: var(--yw-electric); }

.page-home .ph-latest__d{
  display: block;
  margin-bottom: 4px;
  font-family: var(--yw-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--yw-muted);
}

.page-home .ph-latest__x{
  display: block;
  font-size: 14px;
  line-height: 1.65;
}

/* ============================================================
   收尾询价
   ============================================================ */
.page-home .ph-cta{
  background:
    linear-gradient(120deg, rgba(255,106,26,.12), transparent 58%),
    var(--yw-graphite-2);
  border-top: 1px solid var(--yw-line);
}

.page-home .ph-cta__box{
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  align-items: center;
}

.page-home .ph-cta h2{
  margin: 0 0 10px;
  font-size: clamp(21px, 2.7vw, 33px);
  line-height: 1.3;
  letter-spacing: -.015em;
  color: var(--yw-paper);
}

.page-home .ph-cta p{
  margin: 0;
  max-width: 42em;
  font-size: clamp(14px, 1.02vw, 15.5px);
  line-height: 1.85;
  color: rgba(241,237,228,.72);
}

.page-home .ph-cta__acts{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 540px){
  .page-home .ph-tally{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-home .ph-std__index{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 760px){
  .page-home .ph-years__item{
    grid-template-columns: minmax(0, 170px) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 820px){
  .page-home .ph-head{
    grid-template-columns: minmax(0, 178px) minmax(0, 1fr);
    align-items: end;
    gap: clamp(18px, 3vw, 52px);
  }
}

@media (min-width: 900px){
  .page-home .ph-split--7-5{ grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
  .page-home .ph-split--5-7{ grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .page-home .ph-cta__box{ grid-template-columns: minmax(0, 1fr) auto; }
}

@media (min-width: 960px){
  .page-home .ph-hero__grid{
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-home .ph-hero__fig{
    margin-top: clamp(22px, 5vw, 84px);
  }
}

@media (min-width: 1000px){
  .page-home .ph-tally{ grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-home .ph-std__index{ grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-home .ph-steps{ grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-home .ph-steps li{
    padding-right: clamp(16px, 1.8vw, 26px);
    border-bottom: 0;
    border-top: 1px solid var(--yw-line);
    border-bottom: 1px solid var(--yw-line);
  }
  .page-home .ph-steps li + li{
    border-left: 1px solid var(--yw-line);
    padding-left: clamp(16px, 1.8vw, 26px);
  }
  .page-home .ph-steps li:first-child{ padding-left: 0; }
  .page-home .ph-steps li:last-child{ padding-right: 0; }
}

@media (min-width: 1240px){
  .page-home .ph-years__item{ grid-template-columns: minmax(0, 200px) minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce){
  .page-home .ph-index a,
  .page-home .ph-q summary,
  .page-home .ph-latest__list a{
    transition: none;
  }
  .page-home .ph-index a:hover,
  .page-home .ph-index a:focus-visible{ padding-left: 0; }
}