/* ===========================================================
   kenduan.com — 安阳超高 · 工程耐磨配套
   设计体系：「工况选择器」米白 + 工程青，先选场景再出方案。
   与 A 站（单栏论文）、B 站（深色行式目录）结构均不同。
   =========================================================== */
:root{
  --paper:#f7f5ef;
  --paper-2:#efece2;
  --ink:#1b231f;
  --ink-2:#47514c;
  --ink-3:#7c857f;
  --line:#ddd8ca;
  --line-2:#c8c2b1;
  --green:#14524f;
  --green-2:#1c6b66;
  --green-soft:#e3ece9;
  --sand:#c9a06a;
  --col:clamp(20px,3.6vw,56px);
  --max:1360px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--paper);color:var(--ink);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:var(--green);color:#fff}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--col)}
.num{font-variant-numeric:tabular-nums}

/* ---------- 顶栏 ---------- */
.top{position:sticky;top:0;z-index:60;background:rgba(247,245,239,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:74px;gap:28px}
.logo{display:flex;align-items:center;gap:12px}
.logo .mk{width:38px;height:38px;background:var(--green);color:var(--paper);display:grid;place-items:center;font-weight:700;font-size:17px}
.logo b{font-size:20px;letter-spacing:.06em}
.logo i{font-style:normal;display:block;font-size:10.5px;letter-spacing:.28em;color:var(--ink-3);text-transform:uppercase}
.top nav{display:flex;gap:26px;font-size:13.5px;color:var(--ink-2)}
.top nav a{transition:color .25s;padding:3px 0;border-bottom:1px solid transparent}
.top nav a:hover{color:var(--green);border-color:var(--green)}
.top .cta{display:flex;align-items:center;gap:14px}
.top .cta .tel{font-size:14px;font-weight:600;letter-spacing:.02em}
.top .cta .tel span{display:block;font-size:10.5px;font-weight:400;color:var(--ink-3);letter-spacing:.18em}

/* ---------- HERO ---------- */
.hero{position:relative;border-bottom:1px solid var(--line);overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(26px,4vw,60px);align-items:center;padding-top:clamp(44px,5.5vw,80px);padding-bottom:clamp(44px,5.5vw,76px)}
.hero .tag{display:inline-flex;align-items:center;gap:9px;font-size:11.5px;letter-spacing:.26em;color:var(--green);text-transform:uppercase;margin-bottom:24px}
.hero .tag::before{content:"";width:26px;height:2px;background:var(--green)}
.hero h1{font-size:clamp(1.75rem,3.3vw,2.95rem);line-height:1.3;font-weight:800;letter-spacing:-.03em;text-wrap:balance}
.hero h1 u{text-decoration:none;color:var(--green);white-space:nowrap;box-shadow:inset 0 -0.16em 0 rgba(201,160,106,.38)}
.hero p{margin-top:22px;font-size:16.5px;line-height:1.9;color:var(--ink-2);max-width:32em}
.hero p b{color:var(--ink);font-weight:600}
.hero .acts{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.shot{position:relative;overflow:hidden;border:1px solid var(--line)}
.shot img{width:100%;aspect-ratio:3/2;object-fit:cover}
.shot .badge{
  position:absolute;left:0;bottom:0;background:var(--green);color:#fff;padding:11px 16px;
  font-size:12px;letter-spacing:.14em;
}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:9px;height:50px;padding:0 26px;font-size:14.5px;font-weight:600;
  transition:.28s cubic-bezier(.16,1,.3,1);border:1px solid var(--line-2);background:transparent;color:var(--ink);cursor:pointer;font-family:inherit}
.btn:hover{transform:translateY(-2px);border-color:var(--ink)}
.btn:active{transform:scale(.985)}
.btn.fill{background:var(--green);border-color:var(--green);color:#fff}
.btn.fill:hover{background:var(--green-2);border-color:var(--green-2)}
.btn svg{width:14px;height:14px}

/* ---------- 场景选择器 ---------- */
.scenes{padding:clamp(44px,5vw,74px) 0;border-bottom:1px solid var(--line);background:var(--paper-2)}
.scenes .head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:26px}
.scenes .head h2{font-size:clamp(1.35rem,2.4vw,1.85rem);font-weight:800;letter-spacing:-.02em}
.scenes .head p{font-size:13.5px;color:var(--ink-3);max-width:26em}
.tabs{display:flex;gap:8px;flex-wrap:wrap;border-bottom:1px solid var(--line-2);padding-bottom:0}
.tab{
  appearance:none;background:transparent;border:0;border-bottom:2px solid transparent;color:var(--ink-2);
  font-family:inherit;font-size:14.5px;font-weight:600;padding:12px 18px;cursor:pointer;
  display:inline-flex;align-items:center;gap:8px;transition:.25s;margin-bottom:-1px;
}
.tab span{font-size:11px;color:var(--ink-3);letter-spacing:.1em;font-weight:400}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{color:var(--green);border-color:var(--green)}
.tab[aria-selected="true"] span{color:var(--green-2)}

.panel{padding-top:30px}
.panel[hidden]{display:none}
.panel .grid{display:grid;grid-template-columns:1.1fr 1.3fr;gap:clamp(24px,3.4vw,52px);align-items:start}
.panel .say h3{font-size:clamp(1.15rem,1.9vw,1.45rem);font-weight:700;line-height:1.5;margin-bottom:14px;letter-spacing:-.01em}
.panel .say p{font-size:14.5px;color:var(--ink-2);line-height:1.9}
.panel .say .kv{margin-top:24px;display:grid;gap:0;border-top:1px solid var(--line-2)}
.panel .say .kv div{display:flex;justify-content:space-between;gap:16px;padding:11px 0;border-bottom:1px solid var(--line);font-size:13.5px}
.panel .say .kv dt{color:var(--ink-3)}
.panel .say .kv dd{font-weight:600;text-align:right}
.panel .combos{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.combo{background:var(--paper);border:1px solid var(--line);display:flex;flex-direction:column;transition:.3s cubic-bezier(.16,1,.3,1)}
.combo:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:0 14px 30px -18px rgba(20,82,79,.5)}
.combo figure{aspect-ratio:3/2;overflow:hidden;background:var(--paper-2)}
.combo img{width:100%;height:100%;object-fit:cover}
.combo .t{padding:12px 14px 14px;flex:1;display:flex;flex-direction:column;gap:5px}
.combo b{font-size:13.5px;line-height:1.5}
.combo em{font-style:normal;font-size:11.5px;color:var(--ink-3)}

/* ---------- 产品矩阵 ---------- */
.prods{padding:clamp(50px,6vw,92px) 0;border-bottom:1px solid var(--line)}
.phead{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:clamp(26px,3vw,40px)}
.phead h2{font-size:clamp(1.5rem,2.7vw,2.2rem);font-weight:800;letter-spacing:-.025em;line-height:1.2}
.phead p{font-size:14px;color:var(--ink-2);max-width:30em}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,1.6vw,22px)}
.card{border:1px solid var(--line);background:var(--paper);display:flex;flex-direction:column;transition:.35s cubic-bezier(.16,1,.3,1);position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 40px -24px rgba(27,35,31,.45)}
.card figure{aspect-ratio:3/2;overflow:hidden;background:var(--paper-2)}
.card img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.16,1,.3,1)}
.card:hover img{transform:scale(1.05)}
.card .body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:9px;flex:1}
.card .k{font-size:11px;letter-spacing:.2em;color:var(--green);text-transform:uppercase}
.card h3{font-size:16.5px;font-weight:700;line-height:1.45}
.card p{font-size:13.5px;color:var(--ink-2);line-height:1.8;flex:1}
.card .more{font-size:12.5px;color:var(--green);display:inline-flex;align-items:center;gap:6px;font-weight:600}
.card .more svg{width:12px;height:12px;transition:transform .3s}
.card:hover .more svg{transform:translateX(4px)}

/* ---------- 为什么 ---------- */
.why{padding:clamp(50px,6vw,92px) 0;background:var(--green);color:#eef3f1;border-bottom:0}
.why .wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(28px,4vw,64px)}
.why h2{font-size:clamp(1.5rem,2.7vw,2.15rem);font-weight:800;letter-spacing:-.025em;line-height:1.25}
.why .lead{margin-top:16px;font-size:14.5px;color:rgba(238,243,241,.78);line-height:1.9;max-width:26em}
.why .metrics{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:rgba(255,255,255,.16)}
.why .metrics div{background:var(--green);padding:clamp(18px,2.2vw,28px)}
.why .metrics b{display:block;font-size:clamp(1.6rem,2.8vw,2.3rem);font-weight:700;letter-spacing:-.03em;line-height:1.05}
.why .metrics b i{font-style:normal;font-size:.42em;font-weight:400;color:rgba(238,243,241,.6);margin-left:4px;letter-spacing:0}
.why .metrics span{display:block;margin-top:8px;font-size:12.5px;color:rgba(238,243,241,.7);line-height:1.6}

/* ---------- 流程 ---------- */
.flow{padding:clamp(50px,6vw,88px) 0;border-bottom:1px solid var(--line)}
.flow ol{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(14px,2vw,26px);counter-reset:s}
.flow li{position:relative;padding-top:26px;border-top:2px solid var(--line-2)}
.flow li::before{
  counter-increment:s;content:"0" counter(s);position:absolute;top:-2px;left:0;
  font-size:12px;letter-spacing:.18em;color:var(--green);background:var(--paper);padding-right:10px;
  transform:translateY(-50%);line-height:1;
}
.flow h4{font-size:15.5px;font-weight:700;margin-bottom:8px}
.flow p{font-size:13.5px;color:var(--ink-2);line-height:1.85}

/* ---------- FAQ ---------- */
.faq{padding:clamp(50px,6vw,88px) 0;border-bottom:1px solid var(--line)}
.faq .wrap{display:grid;grid-template-columns:.6fr 1.4fr;gap:clamp(24px,3.4vw,56px)}
.faq h2{font-size:clamp(1.35rem,2.2vw,1.8rem);font-weight:800;letter-spacing:-.02em}
.faq details{border-bottom:1px solid var(--line)}
.faq details:first-of-type{border-top:1px solid var(--line-2)}
.faq summary{list-style:none;cursor:pointer;padding:18px 34px 18px 0;position:relative;font-size:15.5px;font-weight:600;transition:color .25s}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:50%;width:8px;height:8px;border-right:1.5px solid var(--ink-3);border-bottom:1.5px solid var(--ink-3);transform:translateY(-70%) rotate(45deg);transition:.35s}
.faq details[open] summary{color:var(--green)}
.faq details[open] summary::after{transform:translateY(-30%) rotate(225deg);border-color:var(--green)}
.faq .a{padding:0 8px 20px 0;font-size:14.5px;color:var(--ink-2);line-height:1.9}

/* ---------- 询价 ---------- */
.inq{padding:clamp(50px,6vw,92px) 0;background:var(--paper-2)}
.inq .wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(28px,4vw,64px)}
.inq h2{font-size:clamp(1.5rem,2.7vw,2.15rem);font-weight:800;letter-spacing:-.025em;line-height:1.25}
.inq p{margin-top:16px;font-size:14.5px;color:var(--ink-2);line-height:1.9;max-width:26em}
.inq .lines{margin-top:26px;border-top:1px solid var(--line-2)}
.inq .lines div{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13.5px}
.inq .lines span{color:var(--ink-3)}
form{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.f{display:flex;flex-direction:column;gap:7px}
.f.full{grid-column:1/-1}
.f label{font-size:11.5px;letter-spacing:.16em;color:var(--ink-3)}
.f input,.f select,.f textarea{
  background:var(--paper);border:1px solid var(--line-2);color:var(--ink);padding:12px 13px;
  font-size:14.5px;font-family:inherit;transition:border-color .25s,box-shadow .25s;
}
.f input:focus,.f select:focus,.f textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(20,82,79,.1)}
.f textarea{resize:vertical;min-height:92px}
.act{grid-column:1/-1;display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:6px}
.act p{font-size:12px;color:var(--ink-3);line-height:1.7;max-width:24em;margin:0}

/* ---------- 页脚 ---------- */
footer{padding:clamp(40px,5vw,64px) 0 24px;font-size:13.5px;color:var(--ink-3)}
footer .cols{display:grid;grid-template-columns:1.7fr .85fr .95fr 1.15fr;gap:clamp(20px,2.6vw,36px);padding-bottom:32px}
footer b{display:block;font-size:13px;color:var(--ink);letter-spacing:.06em;margin-bottom:12px}
footer p,footer li{line-height:2;font-size:13px}
footer ul{list-style:none}
footer a:hover{color:var(--green)}
footer .cp{border-top:1px solid var(--line);padding-top:18px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12px}

/* 进场 */
.rv{opacity:0;transform:translateY(20px);transition:opacity .85s cubic-bezier(.16,1,.3,1),transform .85s cubic-bezier(.16,1,.3,1)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

@media (max-width:1080px){
  .hero .wrap{grid-template-columns:1fr}
  .panel .grid{grid-template-columns:1fr}
  .why .wrap{grid-template-columns:1fr}
  .faq .wrap{grid-template-columns:1fr}
  .inq .wrap{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr 1fr}
  .flow ol{grid-template-columns:1fr 1fr;gap:24px 20px}
}
@media (max-width:820px){
  .top nav{display:none}
  footer .cols{grid-template-columns:1fr 1fr}
  .panel .combos{grid-template-columns:1fr 1fr}
}
@media (max-width:620px){
  .hero h1{font-size:2rem}
  .cards{grid-template-columns:1fr}
  .panel .combos{grid-template-columns:1fr}
  .flow ol{grid-template-columns:1fr}
  form{grid-template-columns:1fr}
  .why .metrics{grid-template-columns:1fr 1fr}
  footer .cols{grid-template-columns:1fr}
  .top .cta .tel span{display:none}
}