/* ==========================================================================
   CSDRILL — Heavy Industry Corporate Site
   Design tokens
   ========================================================================== */

:root{
  --ink:        #16110f;
  --ink-2:      #221815;
  --ink-3:      #302622;
  --ink-4:      #443833;

  --accent:     #f5d400;
  --accent-dk:  #d9ba00;
  --accent-lt:  #ffee5c;
  --danger:     #e8503a;

  --paper:      #ffffff;
  --paper-2:    #f9f9f9;
  --paper-3:    #f2f0ee;

  --text:       #2b2522;
  --text-soft:  #5d5551;
  --muted:      #8e8681;
  --line:       #e4e2df;
  --line-dark:  #cfcbc6;

  --shadow-sm:  0 2px 10px rgba(22,17,15,.06);
  --shadow-md:  0 10px 30px rgba(22,17,15,.10);
  --shadow-lg:  0 24px 60px rgba(22,17,15,.16);

  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;

  --wrap: 1320px;
  --pad: 32px;

  --head: "Barlow Condensed", "Arial Narrow", "Haettenschweiler", Impact, sans-serif;
  --body: "Inter", "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;

  --t: .32s cubic-bezier(.22,.61,.36,1);
}

/* ============================ base ============================ */

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

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

body{
  margin:0;
  font-family:var(--body);
  font-size:15px;
  line-height:1.72;
  color:var(--text);
  background:var(--paper);
  overflow-x:hidden;
}

body.is-locked{ overflow:hidden; }

img{ max-width:100%; display:block; border:0; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; border:0; background:none; cursor:pointer; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4,p{ margin:0; }

::selection{ background:var(--accent); color:var(--ink); }

.wrap{ width:100%; max-width:var(--wrap); margin:0 auto; padding:0 var(--pad); }

/* ============================ typography ============================ */

.h-hero{
  font-family:var(--head);
  font-weight:800;
  font-size:clamp(38px,5vw,74px);
  line-height:.98;
  letter-spacing:-.005em;
  text-transform:uppercase;
}

.h-sec{
  font-family:var(--head);
  font-weight:800;
  font-size:clamp(28px,3.4vw,46px);
  line-height:1.04;
  text-transform:uppercase;
  color:var(--ink);
  letter-spacing:.005em;
}

.h-sub{
  font-family:var(--head);
  font-weight:600;
  font-size:clamp(18px,1.9vw,24px);
  line-height:1.25;
  text-transform:uppercase;
  color:var(--ink-3);
}

.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-size:12px; font-weight:700;
  letter-spacing:.22em; text-transform:uppercase;
  color:var(--muted);
  margin-bottom:14px;
}
.eyebrow::before{
  content:""; width:34px; height:2px; background:var(--accent); flex:none;
}
.eyebrow.on-dark{ color:#b9b1ac; }

.lead{ font-size:16px; color:var(--text-soft); max-width:760px; }

/* ============================ buttons ============================ */

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  height:48px; padding:0 28px;
  font-family:var(--head); font-weight:700; font-size:15px;
  letter-spacing:.1em; text-transform:uppercase;
  border-radius:var(--r-sm);
  transition:all var(--t);
  white-space:nowrap;
}
.btn svg{ flex:none; transition:transform var(--t); }
.btn:hover svg{ transform:translateX(4px); }

.btn-primary{ background:var(--accent); color:var(--ink); }
.btn-primary:hover{ background:var(--accent-dk); box-shadow:0 10px 24px rgba(245,212,0,.35); }

.btn-ghost{ border:1.5px solid rgba(255,255,255,.45); color:#fff; }
.btn-ghost:hover{ background:#fff; color:var(--ink); border-color:#fff; }

.btn-dark{ background:var(--ink); color:#fff; }
.btn-dark:hover{ background:var(--ink-3); }

.btn-line{ border:1.5px solid var(--line-dark); color:var(--ink); }
.btn-line:hover{ border-color:var(--ink); background:var(--ink); color:#fff; }

.link-more{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--head); font-weight:700; font-size:14px;
  letter-spacing:.1em; text-transform:uppercase; color:var(--ink);
  transition:color var(--t), gap var(--t);
}
.link-more::after{ content:"→"; font-size:16px; transition:transform var(--t); }
.link-more:hover{ color:var(--accent-dk); }
.link-more:hover::after{ transform:translateX(5px); }
.link-more.on-dark{ color:#fff; }
.link-more.on-dark:hover{ color:var(--accent); }

html{ scroll-padding-top:130px; } /* 锚点定位时避开悬浮页头 */

/* ============================ topbar ============================ */

.topbar{
  background:var(--ink); color:#a49b96;
  font-size:12.5px; letter-spacing:.03em;
}
.topbar .wrap{
  display:flex; align-items:center; justify-content:space-between;
  gap:20px; min-height:40px;
}
.topbar-group{ display:flex; align-items:center; gap:26px; }
.topbar a{ display:inline-flex; align-items:center; gap:7px; transition:color var(--t); }
.topbar a:hover{ color:var(--accent); }
.topbar svg{ color:var(--accent); flex:none; }

.lang{
  display:inline-flex; align-items:center; gap:2px;
  border:1px solid rgba(255,255,255,.18); border-radius:100px; padding:2px;
}
.lang button{
  padding:3px 11px; border-radius:100px; font-size:11.5px; font-weight:600;
  letter-spacing:.06em; color:#a49b96; transition:all var(--t);
}
.lang button.on{ background:var(--accent); color:var(--ink); }

/* ============================ header ============================ */

.header{
  position:fixed; top:40px; left:0; right:0; z-index:900;
  background:transparent; border-bottom:1px solid transparent;
  transition:background var(--t), border-color var(--t), box-shadow var(--t), top var(--t);
}
/* 滚动后：白底 + 阴影，吸顶 */
.header.is-stuck{
  top:0;
  background:#fff;
  border-bottom-color:var(--line);
  box-shadow:var(--shadow-md);
}
/* 顶部透明态：文字与图标用白色，压在首屏大图上（带轻微渐变压暗保证可读性） */
.header:not(.is-stuck){
  background:linear-gradient(to bottom, rgba(16,12,10,.52), rgba(16,12,10,.18) 70%, rgba(16,12,10,0));
}
.header:not(.is-stuck) .logo-name{ color:#fff; }
.header:not(.is-stuck) .logo-tag{ color:rgba(255,255,255,.62); }
.header:not(.is-stuck) .nav > li > a{ color:rgba(255,255,255,.85); }
.header:not(.is-stuck) .nav > li > a:hover,
.header:not(.is-stuck) .nav > li.active > a{ color:#fff; background:rgba(255,255,255,.14); }
.header:not(.is-stuck) .burger{ border-color:rgba(255,255,255,.35); }
.header:not(.is-stuck) .burger span{ background:#fff; }

.header .wrap{
  display:flex; align-items:center; justify-content:space-between; gap:18px;
  height:82px;
  transition:height var(--t);
}
.header.is-stuck .wrap{ height:66px; }

.logo{ display:flex; align-items:center; gap:11px; flex:none; }
.logo-mark{
  width:40px; height:40px; flex:none;
  background:var(--ink); border-radius:6px;
  display:grid; place-items:center;
  position:relative; overflow:hidden;
}
.logo-mark::after{
  content:""; position:absolute; inset:auto -6px -6px auto;
  width:22px; height:22px; background:var(--accent); transform:rotate(45deg);
}
.logo-mark svg{ position:relative; z-index:1; }
.logo-txt{ line-height:1; }
.logo-name{
  font-family:var(--head); font-weight:800; font-size:23px;
  letter-spacing:.06em; color:var(--ink);
}
.logo-tag{
  font-size:9.5px; letter-spacing:.19em; text-transform:uppercase;
  color:var(--muted); margin-top:3px;
}

.nav{ display:flex; align-items:center; gap:2px; }
.nav > li{ position:relative; }
.nav > li > a{
  display:flex; align-items:center; gap:5px;
  padding:10px 14px; border-radius:var(--r-sm);
  font-family:var(--head); font-weight:600; font-size:14.5px;
  letter-spacing:.075em; text-transform:uppercase; color:var(--ink-2);
  transition:color var(--t), background var(--t);
}
.nav > li > a:hover,
.nav > li.active > a{ color:var(--ink); background:var(--paper-2); }
.nav > li > a::after{
  content:""; position:absolute;
}
.nav .caret{
  width:8px; height:8px; border-right:1.6px solid currentColor; border-bottom:1.6px solid currentColor;
  transform:rotate(45deg) translateY(-2px); transition:transform var(--t);
}
.nav li:hover .caret{ transform:rotate(225deg) translateY(-2px); }

.drop{
  position:absolute; top:calc(100% + 10px); left:-10px;
  min-width:260px; background:#fff;
  border:1px solid var(--line); border-radius:var(--r-md);
  box-shadow:var(--shadow-lg);
  padding:10px;
  opacity:0; visibility:hidden; transform:translateY(10px);
  transition:all var(--t);
}
.drop::before{
  content:""; position:absolute; top:-11px; left:0; right:0; height:12px;
}
.nav li:hover .drop{ opacity:1; visibility:visible; transform:translateY(0); }
.drop a{
  display:flex; align-items:center; justify-content:space-between; gap:14px;
  padding:10px 13px; border-radius:var(--r-sm);
  font-size:13.5px; font-weight:500; color:var(--text-soft);
  transition:all var(--t);
}
.drop a::after{ content:"→"; opacity:0; color:var(--accent-dk); transition:all var(--t); }
.drop a:hover{ background:var(--paper-2); color:var(--ink); padding-left:17px; }
.drop a:hover::after{ opacity:1; }

.header-cta{ display:flex; align-items:center; gap:12px; flex:none; }
.header-cta .btn{ height:44px; padding:0 22px; font-size:14px; }

.burger{
  display:none; width:44px; height:44px; border:1px solid var(--line);
  border-radius:var(--r-sm); place-items:center; gap:0;
}
.burger span{
  display:block; width:19px; height:2px; background:var(--ink);
  transition:all var(--t); position:relative;
}
.burger span + span{ margin-top:5px; }
.burger.on span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.burger.on span:nth-child(2){ opacity:0; }
.burger.on span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* mobile nav */
.mnav{
  position:fixed; inset:0 0 0 auto; width:min(400px,88vw);
  background:var(--ink); z-index:1000;
  transform:translateX(100%); transition:transform var(--t);
  display:flex; flex-direction:column;
  overflow-y:auto; padding:26px 0 40px;
}
.mnav.open{ transform:translateX(0); }
.mnav-head{
  display:flex; align-items:center; justify-content:space-between;
  padding:0 24px 22px; border-bottom:1px solid rgba(255,255,255,.1);
}
.mnav-close{ color:#fff; font-size:26px; line-height:1; }
.mnav-list{ padding:12px 0; }
.mnav-list > li > a,
.mnav-list > li > button{
  display:flex; align-items:center; justify-content:space-between;
  width:100%; padding:14px 24px; text-align:left;
  font-family:var(--head); font-weight:600; font-size:17px;
  letter-spacing:.08em; text-transform:uppercase; color:#fff;
}
.mnav-list .sub{ display:none; padding:0 0 8px; }
.mnav-list .sub.open{ display:block; }
.mnav-list .sub a{
  display:block; padding:9px 24px 9px 40px;
  font-size:14px; color:#a49b96; border-left:2px solid transparent;
}
.mnav-list .sub a:hover{ color:var(--accent); }
.mnav-foot{ margin-top:auto; padding:22px 24px 0; border-top:1px solid rgba(255,255,255,.1); color:#a49b96; font-size:13px; }
.mnav-foot a{ display:block; padding:6px 0; }
.scrim{
  position:fixed; inset:0; background:rgba(10,8,7,.62); z-index:999;
  opacity:0; visibility:hidden; transition:all var(--t);
  backdrop-filter:blur(2px);
}
.scrim.on{ opacity:1; visibility:visible; }

/* ============================ hero ============================ */

.hero{ position:relative; background:var(--ink); overflow:hidden; }
.hero-track{ position:relative; height:clamp(560px,84vh,860px); }

.slide{
  position:absolute; inset:0;
  opacity:0; visibility:hidden;
  transition:opacity 1s ease, visibility 1s;
}
.slide.on{ opacity:1; visibility:visible; }

.slide-bg{
  position:absolute; inset:0;
  background-size:cover; background-position:center;
  transform:scale(1.06);
}
.slide.on .slide-bg{ animation:kenburns 7s ease-out forwards; }
@keyframes kenburns{ from{ transform:scale(1.12);} to{ transform:scale(1);} }

.slide::before{
  content:""; position:absolute; inset:0; z-index:1;
  background:linear-gradient(100deg, rgba(16,12,10,.92) 0%, rgba(16,12,10,.78) 38%, rgba(16,12,10,.34) 68%, rgba(16,12,10,.5) 100%);
}
.slide::after{
  content:""; position:absolute; inset:auto 0 0 0; height:180px; z-index:1;
  background:linear-gradient(to top, rgba(16,12,10,.85), transparent);
}

.slide-inner{
  position:relative; z-index:2; height:100%;
  display:flex; align-items:center;
}
.slide-inner .wrap{ width:100%; }
.slide-body{ max-width:800px; }
.slide-tag{
  display:inline-flex; align-items:center; gap:9px;
  height:30px; padding:0 14px; margin-bottom:22px;
  background:rgba(245,212,0,.14); border:1px solid rgba(245,212,0,.5);
  border-radius:100px;
  font-size:11.5px; font-weight:700; letter-spacing:.18em;
  text-transform:uppercase; color:var(--accent);
}
.slide-tag::before{ content:""; width:6px; height:6px; border-radius:50%; background:var(--accent); }
.slide h1{ color:#fff; margin-bottom:20px; max-width:16ch; }
.slide h1 em{ font-style:normal; color:var(--accent); }
.slide p{
  color:#cfc8c3; font-size:16.5px; max-width:600px; margin-bottom:32px;
}
.slide-actions{ display:flex; align-items:center; gap:14px; flex-wrap:wrap; }

.slide.on .slide-tag,
.slide.on .slide h1,
.slide.on .slide p,
.slide.on .slide-actions{ animation:rise .85s cubic-bezier(.22,.61,.36,1) both; }
.slide.on .slide h1{ animation-delay:.08s; }
.slide.on .slide p{ animation-delay:.16s; }
.slide.on .slide-actions{ animation-delay:.24s; }
@keyframes rise{ from{ opacity:0; transform:translateY(26px);} to{ opacity:1; transform:none;} }

.hero-nav{
  position:absolute; z-index:5; left:0; right:0; bottom:0;
}
.hero-nav .wrap{
  display:flex; align-items:center; justify-content:space-between;
  padding-bottom:34px; gap:20px;
}
@media (min-width:1024px){
  .hero-nav .wrap{ padding-right:280px; }
}
.hero-dots{ display:flex; align-items:center; gap:10px; }
.hero-dots button{
  width:38px; height:3px; background:rgba(255,255,255,.32);
  border-radius:2px; transition:all var(--t); position:relative; overflow:hidden;
}
.hero-dots button.on{ background:rgba(255,255,255,.28); }
.hero-dots button.on::after{
  content:""; position:absolute; inset:0; background:var(--accent);
  transform-origin:left; animation:fillbar 6s linear forwards;
}
@keyframes fillbar{ from{ transform:scaleX(0);} to{ transform:scaleX(1);} }

.hero-arrows{ display:flex; gap:10px; }
.hero-arrows button{
  width:50px; height:50px; border:1.5px solid rgba(255,255,255,.35);
  border-radius:50%; display:grid; place-items:center; color:#fff;
  transition:all var(--t);
}
.hero-arrows button:hover{ background:var(--accent); border-color:var(--accent); color:var(--ink); }

.hero-strip{
  position:absolute; z-index:6; right:0; bottom:0;
  background:var(--accent); color:var(--ink);
  padding:16px 30px 16px 34px;
  display:flex; align-items:center; gap:16px;
  clip-path:polygon(28px 0, 100% 0, 100% 100%, 0 100%);
}
.hero-strip b{ font-family:var(--head); font-weight:800; font-size:26px; line-height:1; }
.hero-strip span{ font-size:11.5px; font-weight:600; letter-spacing:.1em; text-transform:uppercase; opacity:.75; line-height:1.3; }
.hero-strip i{ width:1px; height:34px; background:rgba(22,17,15,.22); }

/* ============================ section frame ============================ */

.sec{ padding:96px 0; }
.sec-tight{ padding:72px 0; }
.sec-grey{ background:var(--paper-2); }
.sec-dark{ background:var(--ink); color:#fff; }
.sec-3{ background:var(--paper-3); }

.sec-head{ max-width:820px; margin-bottom:52px; }
.sec-head.center{ margin-left:auto; margin-right:auto; text-align:center; }
.sec-head.center .eyebrow{ justify-content:center; }
.sec-head .h-sub{ margin-top:12px; color:var(--muted); font-weight:600; }
.sec-head .lead{ margin-top:18px; }
.sec-head-row{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap:30px; margin-bottom:52px; flex-wrap:wrap;
}
.sec-head-row .sec-head{ margin-bottom:0; }

/* ============================ category grid ============================ */

.cats{
  display:grid; grid-template-columns:repeat(3,1fr); gap:20px;
}
.cat{
  position:relative; display:block;
  background:#fff; border:1px solid var(--line); border-radius:var(--r-md);
  padding:34px 30px 30px;
  transition:all var(--t); overflow:hidden;
}
.cat::after{
  content:""; position:absolute; left:0; bottom:0; width:100%; height:3px;
  background:var(--accent); transform:scaleX(0); transform-origin:left;
  transition:transform var(--t);
}
.cat:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); border-color:transparent; }
.cat:hover::after{ transform:scaleX(1); }

.cat-ico{
  width:52px; height:52px; border-radius:var(--r-sm);
  background:var(--paper-2); display:grid; place-items:center;
  color:var(--ink); margin-bottom:22px; transition:all var(--t);
}
.cat:hover .cat-ico{ background:var(--accent); }
.cat-ico svg{ width:26px; height:26px; }
.cat h3{
  font-family:var(--head); font-weight:700; font-size:21px;
  text-transform:uppercase; letter-spacing:.03em; color:var(--ink);
  margin-bottom:9px;
}
.cat p{ font-size:13.8px; color:var(--text-soft); margin-bottom:18px; }
.cat-num{
  position:absolute; top:22px; right:26px;
  font-family:var(--head); font-weight:800; font-size:38px;
  color:var(--paper-3); line-height:1; transition:color var(--t);
}
.cat:hover .cat-num{ color:rgba(245,212,0,.4); }

/* ============================ product carousel ============================ */

.pgroup{ padding:44px 0; border-bottom:1px solid var(--line); }
.pgroup:last-child{ border-bottom:0; }
.sec-dark .pgroup{ border-color:rgba(255,255,255,.1); }

.pgroup-head{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap:24px; margin-bottom:28px; flex-wrap:wrap;
}
.pgroup-head .h-sub{ color:var(--ink); }
.sec-dark .pgroup-head .h-sub{ color:#fff; }
.pgroup-meta{
  font-size:12px; font-weight:700; letter-spacing:.18em;
  text-transform:uppercase; color:var(--muted); margin-bottom:8px;
}
.pgroup-tools{ display:flex; align-items:center; gap:10px; }
.pgroup-tools .count{
  font-family:var(--head); font-weight:700; font-size:14px;
  letter-spacing:.1em; color:var(--muted); margin-right:6px;
}
.arrow-btn{
  width:46px; height:46px; border:1.5px solid var(--line-dark);
  border-radius:var(--r-sm); display:grid; place-items:center;
  color:var(--ink); transition:all var(--t);
}
.arrow-btn:hover{ background:var(--ink); border-color:var(--ink); color:#fff; }
.arrow-btn:disabled{ opacity:.3; cursor:not-allowed; }
.sec-dark .arrow-btn{ border-color:rgba(255,255,255,.25); color:#fff; }
.sec-dark .arrow-btn:hover{ background:var(--accent); border-color:var(--accent); color:var(--ink); }

.rail{
  display:flex; gap:20px; overflow-x:auto; scroll-behavior:smooth;
  scroll-snap-type:x mandatory; padding-bottom:6px;
  scrollbar-width:none;
}
.rail::-webkit-scrollbar{ display:none; }
.rail > *{ scroll-snap-align:start; }

.pcard{
  flex:0 0 calc((100% - 60px) / 4);
  background:#fff; border:1px solid var(--line); border-radius:var(--r-md);
  overflow:hidden; display:flex; flex-direction:column;
  transition:all var(--t);
}
.pcard:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); border-color:transparent; }

.pcard-media{
  position:relative; aspect-ratio:4/3;
  background-size:cover; background-position:center; background-color:var(--ink);
}
.pcard-media::before{
  content:""; position:absolute; inset:0;
  background:linear-gradient(160deg, rgba(16,12,10,.55), rgba(16,12,10,.78));
  transition:opacity var(--t);
}
.pcard:hover .pcard-media::before{ opacity:.72; }
.pcard-series{
  position:absolute; top:12px; left:12px;
  padding:4px 10px; border-radius:100px;
  background:var(--accent); color:var(--ink);
  font-size:10.5px; font-weight:800; letter-spacing:.12em; text-transform:uppercase;
}
.pcard-model{
  position:absolute; left:16px; right:16px; bottom:14px;
  font-family:var(--head); font-weight:800; font-size:25px;
  letter-spacing:.03em; color:#fff; line-height:1;
  text-shadow:0 2px 12px rgba(0,0,0,.55);
}
.pcard-body{ padding:18px 18px 20px; display:flex; flex-direction:column; flex:1; }
.pcard-body p{ font-size:13px; color:var(--text-soft); flex:1; margin-bottom:14px; }
.pcard-body .link-more{ font-size:12.5px; }

/* ======================= 首页九大系列九宫格 ======================= */

.series-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:22px;
}

.scard{
  display:flex; flex-direction:column; overflow:hidden;
  background:#fff; border:1px solid var(--line); border-radius:var(--r-md);
  transition:all var(--t);
}
.scard:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); border-color:transparent; }

.scard-media{
  position:relative; aspect-ratio:16/10;
  background-size:cover; background-position:center; background-color:var(--ink);
}
.scard-media::before{
  content:""; position:absolute; inset:0;
  background:linear-gradient(165deg, rgba(16,12,10,.34), rgba(16,12,10,.84));
  transition:opacity var(--t);
}
.scard:hover .scard-media::before{ opacity:.76; }

.scard-idx{
  position:absolute; top:12px; left:12px;
  width:30px; height:30px; border-radius:100px;
  display:grid; place-items:center;
  background:var(--accent); color:var(--ink);
  font-family:var(--head); font-weight:800; font-size:13px; letter-spacing:.04em;
}
.scard-code{
  position:absolute; left:18px; right:18px; bottom:14px;
  font-family:var(--head); font-weight:800; font-size:20px;
  letter-spacing:.04em; text-transform:uppercase; color:#fff; line-height:1.15;
  text-shadow:0 2px 12px rgba(0,0,0,.55);
}

.scard-body{ padding:20px 20px 18px; display:flex; flex-direction:column; flex:1; }
.scard-body h3{
  font-family:var(--head); font-weight:800; font-size:20px; line-height:1.2;
  color:var(--ink); margin-bottom:9px;
}
.scard-body p{ font-size:13px; color:var(--text-soft); flex:1; margin-bottom:16px; }
.scard-foot{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  border-top:1px solid var(--line); padding-top:13px;
}
.scard-count{
  font-size:11.5px; font-weight:700; letter-spacing:.13em;
  text-transform:uppercase; color:var(--muted);
}
.scard-foot .link-more{ font-size:12.5px; }

/* ============================ applications ============================ */

.apps{ display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.app{
  position:relative; display:block; overflow:hidden;
  border-radius:var(--r-md); min-height:330px;
  background-size:cover; background-position:center; background-color:var(--ink-2);
}
.app::before{
  content:""; position:absolute; inset:0;
  background:linear-gradient(to top, rgba(16,12,10,.94) 4%, rgba(16,12,10,.42) 52%, rgba(16,12,10,.22));
  transition:all var(--t);
}
.app:hover::before{ background:linear-gradient(to top, rgba(16,12,10,.96) 4%, rgba(16,12,10,.6) 56%, rgba(16,12,10,.35)); }
.app-body{
  position:relative; z-index:1; height:100%;
  display:flex; flex-direction:column; justify-content:flex-end;
  padding:28px 26px;
}
.app-body h3{
  font-family:var(--head); font-weight:800; font-size:24px;
  text-transform:uppercase; letter-spacing:.03em; color:#fff; margin-bottom:8px;
}
.app-body p{ font-size:13.5px; color:#bdb6b1; margin-bottom:16px; }
.app-body .link-more{ color:#fff; font-size:13px; }
.app:hover .app-body .link-more{ color:var(--accent); }
.app-idx{
  position:absolute; top:20px; right:22px; z-index:1;
  font-family:var(--head); font-weight:800; font-size:14px;
  letter-spacing:.14em; color:rgba(255,255,255,.55);
}

/* ============================ advantages ============================ */

.advs{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; }
.adv{
  padding:0 30px; border-left:1px solid var(--line);
  display:flex; flex-direction:column;
}
.adv:first-child{ border-left:0; padding-left:0; }
.adv:last-child{ padding-right:0; }
.adv-ico{
  width:44px; height:44px; color:var(--accent-dk); margin-bottom:20px;
}
.adv-ico svg{ width:100%; height:100%; }
.adv h3{
  font-family:var(--head); font-weight:700; font-size:20px;
  text-transform:uppercase; letter-spacing:.03em; color:var(--ink);
  margin-bottom:10px;
}
.adv p{ font-size:13.8px; color:var(--text-soft); }

/* ============================ who we are ============================ */

.split{ display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; }
.split-media{ position:relative; }
.split-media img{ border-radius:var(--r-md); width:100%; }
.split-media::before{
  content:""; position:absolute; left:-18px; top:-18px;
  width:130px; height:130px; border-left:4px solid var(--accent);
  border-top:4px solid var(--accent); border-radius:var(--r-md) 0 0 0;
}
.split-media .badge{
  position:absolute; right:-16px; bottom:-16px;
  background:var(--ink); color:#fff; border-radius:var(--r-md);
  padding:20px 24px; text-align:center;
}
.split-media .badge b{
  display:block; font-family:var(--head); font-weight:800;
  font-size:38px; color:var(--accent); line-height:1;
}
.split-media .badge span{
  font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:#a49b96;
}
.split-body .h-sec{ margin-bottom:20px; }
.split-body p{ color:var(--text-soft); margin-bottom:18px; }
.slogan{
  font-family:var(--head); font-weight:700; font-size:22px;
  text-transform:uppercase; color:var(--ink);
  padding-left:18px; border-left:3px solid var(--accent);
  margin:26px 0 28px; line-height:1.3;
}

/* ============================ stats ============================ */

.stats{ display:grid; grid-template-columns:repeat(4,1fr); }
.stat{
  padding:10px 26px; border-left:1px solid rgba(255,255,255,.13);
  text-align:center;
}
.stat:first-child{ border-left:0; }
.stat b{
  display:block; font-family:var(--head); font-weight:800;
  font-size:clamp(40px,4.6vw,62px); color:var(--accent);
  line-height:1; letter-spacing:-.01em;
}
.stat span{
  display:block; margin-top:12px; font-size:12px; font-weight:600;
  letter-spacing:.13em; text-transform:uppercase; color:#a49b96;
}

/* ============================ global reach ============================ */

.reach{ display:grid; grid-template-columns:280px 1fr; gap:52px; align-items:start; }
.reach-list{ display:flex; flex-wrap:wrap; gap:9px; }
.chip{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 15px; border:1px solid var(--line); border-radius:100px;
  font-size:13px; color:var(--text-soft); background:#fff;
  transition:all var(--t);
}
.chip:hover{ border-color:var(--accent); background:#fffbe0; color:var(--ink); }
.chip i{ font-style:normal; font-size:15px; line-height:1; }

/* ============================ news ============================ */

.news{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.ncard{
  background:#fff; border:1px solid var(--line); border-radius:var(--r-md);
  overflow:hidden; display:flex; flex-direction:column;
  transition:all var(--t);
}
.ncard:hover{ transform:translateY(-6px); box-shadow:var(--shadow-md); border-color:transparent; }
.ncard-media{
  aspect-ratio:16/10; background-size:cover; background-position:center;
  background-color:var(--ink-2); position:relative;
}
.ncard-tag{
  position:absolute; top:14px; left:14px;
  padding:5px 12px; border-radius:100px;
  background:rgba(22,17,15,.82); color:var(--accent);
  font-size:10.5px; font-weight:700; letter-spacing:.14em; text-transform:uppercase;
  backdrop-filter:blur(4px);
}
.ncard-body{ padding:24px 24px 26px; display:flex; flex-direction:column; flex:1; }
.ncard-date{
  font-size:11.5px; font-weight:700; letter-spacing:.14em;
  text-transform:uppercase; color:var(--muted); margin-bottom:10px;
}
.ncard h3{
  font-family:var(--head); font-weight:700; font-size:19px;
  line-height:1.24; text-transform:uppercase; letter-spacing:.02em;
  color:var(--ink); margin-bottom:12px; flex:1;
}
.ncard:hover h3{ color:var(--accent-dk); }

/* ============================ cta band ============================ */

.cta{
  background:var(--accent); color:var(--ink);
  position:relative; overflow:hidden;
}
.cta::after{
  content:"CSDRILL"; position:absolute; right:-20px; top:50%;
  transform:translateY(-50%);
  font-family:var(--head); font-weight:800; font-size:190px;
  color:rgba(22,17,15,.055); line-height:1; pointer-events:none;
  letter-spacing:.02em;
}
.cta .wrap{
  display:flex; align-items:center; justify-content:space-between;
  gap:36px; padding-top:62px; padding-bottom:62px; flex-wrap:wrap;
  position:relative; z-index:1;
}
.cta h2{
  font-family:var(--head); font-weight:800; font-size:clamp(28px,3.6vw,46px);
  text-transform:uppercase; line-height:1.04; margin-bottom:10px;
}
.cta p{ font-size:15px; color:rgba(22,17,15,.72); max-width:560px; }

/* ============================ footer ============================ */

.footer{ background:var(--ink); color:#9c948f; font-size:13.5px; }
.footer-top{
  display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr 1.3fr;
  gap:40px; padding:76px 0 56px;
}
.footer h4{
  font-family:var(--head); font-weight:700; font-size:16px;
  text-transform:uppercase; letter-spacing:.11em; color:#fff;
  margin-bottom:22px;
}
.footer-brand .logo-name{ color:#fff; }
.footer-brand .logo-tag{ color:#8b837e; }
.footer-brand p{ margin:22px 0 24px; line-height:1.75; }
.footer ul a{ display:block; padding:6px 0; transition:all var(--t); }
.footer ul a:hover{ color:var(--accent); padding-left:5px; }
.footer-contact li{ display:flex; gap:11px; padding:8px 0; align-items:flex-start; }
.footer-contact svg{ color:var(--accent); flex:none; margin-top:4px; }
.footer-contact b{ color:#fff; font-weight:600; }

.socials{ display:flex; gap:10px; }
.socials a{
  width:38px; height:38px; border:1px solid rgba(255,255,255,.16);
  border-radius:var(--r-sm); display:grid; place-items:center; color:#9c948f;
  transition:all var(--t);
}
.socials a:hover{ background:var(--accent); border-color:var(--accent); color:var(--ink); }

.footer-bot{
  border-top:1px solid rgba(255,255,255,.1);
  padding:24px 0; display:flex; align-items:center; justify-content:space-between;
  gap:20px; flex-wrap:wrap; font-size:12.5px;
}
.footer-bot nav{ display:flex; gap:22px; flex-wrap:wrap; }
.footer-bot nav a:hover{ color:var(--accent); }

/* ============================ page hero (inner pages) ============================ */

.phero{
  position:relative; background:var(--ink); color:#fff;
  padding:170px 0 78px; overflow:hidden; /* 顶部给固定悬浮页头让位 */
}
.phero-bg{
  position:absolute; inset:0; background-size:cover; background-position:center;
  opacity:.34;
}
.phero::before{
  content:""; position:absolute; inset:0;
  background:linear-gradient(90deg, rgba(16,12,10,.94), rgba(16,12,10,.6));
}
.phero .wrap{ position:relative; z-index:1; }
.phero h1{
  font-family:var(--head); font-weight:800;
  font-size:clamp(34px,4.6vw,60px); text-transform:uppercase; line-height:1;
  margin-bottom:14px;
}
.phero p{ color:#c0b9b4; max-width:640px; }
.crumb{
  display:flex; align-items:center; gap:9px; margin-top:22px;
  font-size:12.5px; letter-spacing:.06em; color:#8b837e;
}
.crumb a:hover{ color:var(--accent); }
.crumb span{ color:var(--accent); }

/* ============================ misc blocks ============================ */

.tabs{ display:flex; flex-wrap:wrap; gap:10px; margin-bottom:44px; }
.tab{
  padding:11px 22px; border:1.5px solid var(--line); border-radius:100px;
  font-family:var(--head); font-weight:600; font-size:14.5px;
  letter-spacing:.07em; text-transform:uppercase; color:var(--text-soft);
  transition:all var(--t);
}
.tab:hover{ border-color:var(--ink); color:var(--ink); }
.tab.on{ background:var(--ink); border-color:var(--ink); color:var(--accent); }

.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:28px; }

.info-card{
  background:#fff; border:1px solid var(--line); border-radius:var(--r-md);
  padding:32px 30px; transition:all var(--t);
}
.info-card:hover{ box-shadow:var(--shadow-md); border-color:transparent; transform:translateY(-4px); }
.info-card h3{
  font-family:var(--head); font-weight:700; font-size:19px;
  text-transform:uppercase; letter-spacing:.03em; margin-bottom:10px; color:var(--ink);
}
.info-card p{ font-size:13.8px; color:var(--text-soft); }
.info-card .ico{ color:var(--accent-dk); margin-bottom:18px; }

.form{ display:grid; gap:16px; }
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.field label{
  display:block; font-size:12px; font-weight:700; letter-spacing:.12em;
  text-transform:uppercase; color:var(--muted); margin-bottom:8px;
}
.field input,.field select,.field textarea{
  width:100%; padding:13px 15px; font:inherit; font-size:14px;
  color:var(--text); background:#fff;
  border:1px solid var(--line); border-radius:var(--r-sm);
  transition:border-color var(--t), box-shadow var(--t);
}
.field textarea{ min-height:130px; resize:vertical; }
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(245,212,0,.22);
}
.form .btn{ justify-self:start; }
.form-note{ font-size:12.5px; color:var(--muted); }

/* ============================ reveal ============================ */

.reveal{ opacity:0; transform:translateY(28px); transition:opacity .7s ease, transform .7s cubic-bezier(.22,.61,.36,1); }
.reveal.in{ opacity:1; transform:none; }

/* ============================ responsive ============================ */

@media (max-width:1180px){
  .nav > li > a{ padding:10px 10px; font-size:13.5px; letter-spacing:.05em; }
  .pcard{ flex-basis:calc((100% - 40px) / 3); }
  .footer-top{ grid-template-columns:1.4fr 1fr 1fr 1.2fr; }
  .footer-top > *:nth-child(4){ display:none; }
}

@media (max-width:1024px){
  :root{ --pad:24px; }
  .nav,.header-cta .btn{ display:none; }
  .burger{ display:grid; }
  .sec{ padding:74px 0; }
  .cats{ grid-template-columns:repeat(2,1fr); }
  .series-grid{ grid-template-columns:repeat(2,1fr); gap:18px; }
  .apps{ grid-template-columns:repeat(2,1fr); }
  .advs{ grid-template-columns:repeat(2,1fr); gap:36px 0; }
  .adv:nth-child(3){ border-left:0; padding-left:0; }
  .split{ grid-template-columns:1fr; gap:44px; }
  .stats{ grid-template-columns:repeat(2,1fr); gap:34px 0; }
  .stat:nth-child(3){ border-left:0; }
  .reach{ grid-template-columns:1fr; gap:30px; }
  .news{ grid-template-columns:1fr 1fr; }
  .grid-3,.grid-4{ grid-template-columns:repeat(2,1fr); }
  .footer-top{ grid-template-columns:1fr 1fr; }
  .footer-top > *:nth-child(4){ display:block; }
  .hero-strip{ display:none; }
}

@media (max-width:768px){
  .topbar .wrap{ justify-content:center; }
  .topbar-group:first-child{ display:none; }
  .pcard{ flex-basis:calc((100% - 20px) / 2); }
  .apps{ grid-template-columns:1fr; }
  .cats{ grid-template-columns:1fr; }
  .series-grid{ grid-template-columns:1fr; gap:16px; }
  .news{ grid-template-columns:1fr; }
  .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; }
  .form-row{ grid-template-columns:1fr; }
  .advs{ grid-template-columns:1fr; gap:34px; }
  .adv{ border-left:0; padding:0 0 0 18px; border-left:3px solid var(--line); }
  .adv:first-child{ border-left:3px solid var(--accent); padding-left:18px; }
  .hero-track{ height:auto; min-height:600px; }
  .slide{ position:relative; }
  .slide:not(.on){ display:none; }
  .slide-inner{ padding:130px 0 120px; }
  .hero-nav .wrap{ padding-bottom:22px; }
  .hero-dots button{ width:26px; }
  .split-media::before,.split-media .badge{ display:none; }
  .footer-top{ grid-template-columns:1fr; padding:56px 0 40px; }
  .cta::after{ display:none; }
  .sec-head-row{ align-items:flex-start; }
}

@media (max-width:560px){
  .pcard{ flex-basis:86%; }
  .stats{ grid-template-columns:1fr; }
  .stat{ border-left:0; padding:18px 0; border-bottom:1px solid rgba(255,255,255,.13); }
  .stat:last-child{ border-bottom:0; }
  .hero-arrows button{ width:42px; height:42px; }
}

/* ==========================================================================
   后台可控外观：Logo 图片模式 / 区块开关
   ========================================================================== */
.logo.has-img .logo-mark{
  background:transparent; border-radius:0; overflow:visible;
  width:auto; height:var(--logo-h,40px);
}
.logo.has-img .logo-mark::after{ display:none; }
.logo.has-img .logo-mark img.logo-img{
  height:var(--logo-h,40px); width:auto; max-width:none; display:block;
  object-fit:contain;
}
.footer-brand .logo.has-img .logo-mark{
  background:transparent; height:var(--logo-h,40px);
}
.footer-brand .logo.has-img .logo-mark img.logo-img{ height:var(--logo-h,40px); }
.mnav-head .logo-name{ font-family:var(--head); font-weight:800; font-size:19px; letter-spacing:.06em; }

/* 后台可在「页面布局」里关闭首页区块 */
[data-block][hidden]{ display:none !important; }