/* ==========================================================================
   Dunshun Lubricants — shared stylesheet
   Dark industrial theme: deep navy base + cyan accent
   ========================================================================== */

:root{
  --navy-900:#071A26;
  --navy-800:#0B2534;
  --navy-700:#0E3245;
  --navy-600:#14415A;
  --cyan-500:#2E9BC6;
  --cyan-400:#4FB3D8;
  --cyan-300:#8AD0EC;
  --steel-400:#8FA6B4;
  --steel-300:#B9C9D4;
  --line:rgba(143,166,180,.22);
  --line-soft:rgba(143,166,180,.12);
  --card:#0E2C3D;
  --card-2:#123449;
  --text:#E8F1F6;
  --text-dim:#A9C0CE;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,0,0,.32);
}

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

html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--navy-900);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan-400);text-decoration:none}
a:hover{color:var(--cyan-300)}

:focus-visible{outline:3px solid var(--cyan-400);outline-offset:2px;border-radius:4px}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--cyan-500);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;
}
.skip-link:focus{left:0;color:#fff}

/* ---------- topbar ---------- */
.topbar{background:#04121B;color:var(--steel-300);font-size:13px;border-bottom:1px solid var(--line-soft)}
.topbar .in{
  max-width:1220px;margin:0 auto;padding:8px 24px;
  display:flex;gap:22px;flex-wrap:wrap;justify-content:flex-end;
}
.topbar a{color:var(--cyan-300)}

/* ---------- header ---------- */
header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,26,38,.94);
  backdrop-filter:saturate(150%) blur(8px);
  border-bottom:1px solid var(--line);
}
header .in{
  max-width:1220px;margin:0 auto;padding:12px 24px;
  display:flex;align-items:center;gap:28px;flex-wrap:wrap;
}
.logo{display:flex;align-items:center;gap:12px}
.logo img{height:40px;width:auto;border-radius:6px;background:#fff;padding:3px 5px}
.logo b{font-size:17px;color:#fff;letter-spacing:.4px}
nav{display:flex;gap:22px;margin-left:auto;flex-wrap:wrap}
nav a{
  color:var(--steel-300);font-weight:500;font-size:15px;
  padding:5px 0;border-bottom:2px solid transparent;
}
nav a:hover,nav a.active{color:var(--cyan-400);border-bottom-color:var(--cyan-500);text-decoration:none}

.nav-toggle{display:none}

/* ---------- layout ---------- */
.wrap{max-width:1220px;margin:0 auto;padding:0 24px}
main{padding:34px 0 68px;min-height:56vh}

/* ---------- typography ---------- */
h1{font-size:34px;line-height:1.22;margin:0 0 14px;color:#fff;letter-spacing:-.4px}
h2{
  font-size:24px;margin:44px 0 16px;color:#fff;
  border-left:4px solid var(--cyan-500);padding-left:12px;line-height:1.3;
}
h3{font-size:18px;margin:22px 0 8px;color:var(--cyan-300)}
p{margin:12px 0}
ul,ol{padding-left:22px}
li{margin:6px 0}
strong{color:#fff}
small{color:var(--steel-400)}

.eyebrow{
  display:inline-block;font-size:12px;font-weight:700;letter-spacing:1.6px;
  text-transform:uppercase;color:var(--cyan-400);margin-bottom:8px;
}
.lede{font-size:18px;color:var(--text-dim);max-width:760px}
.muted{color:var(--steel-400);font-size:14px}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;padding:13px 26px;border-radius:8px;
  font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;
  transition:transform .16s ease,box-shadow .16s ease,background .16s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:var(--cyan-500);color:#fff}
.btn-primary:hover{background:var(--cyan-400);color:#06202e;box-shadow:0 8px 22px rgba(46,155,198,.34)}
.btn-ghost{border-color:var(--cyan-500);color:var(--cyan-300)}
.btn-ghost:hover{background:rgba(46,155,198,.14);color:#fff}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0}

/* ==========================================================================
   Homepage showcase carousel (left-to-right switching)
   ========================================================================== */
.showcase{position:relative;background:#04121B;overflow:hidden}
.showcase-track{position:relative;width:100%;height:clamp(280px,42vw,560px)}
.showcase-slide{
  position:absolute;inset:0;
  opacity:0;visibility:hidden;
  transform:translateX(6%);
  transition:opacity .75s ease,transform .75s ease,visibility 0s linear .75s;
}
.showcase-slide.is-active{
  opacity:1;visibility:visible;transform:translateX(0);
  transition:opacity .75s ease,transform .75s ease,visibility 0s;
  z-index:2;
}
.showcase-slide img{width:100%;height:100%;object-fit:cover;object-position:center}
.showcase-captions{
  position:absolute;left:0;right:0;bottom:34px;z-index:3;
  padding:0 24px;pointer-events:none;
}
.showcase-cap{
  padding:0 0 18px;
  background:linear-gradient(to top,rgba(4,18,27,.92) 20%,rgba(4,18,27,.55) 70%,rgba(4,18,27,0));
}
.showcase-cap h2{
  margin:0 0 4px;border-left:0;padding:0;
  font-size:clamp(18px,2.1vw,26px);color:#fff;
}
.showcase-cap p{margin:0;font-size:14px;color:var(--steel-300);max-width:640px}

.showcase-dots{
  position:absolute;left:0;right:0;bottom:0;z-index:4;
  display:flex;justify-content:center;gap:9px;padding:0 24px 12px;
}
.showcase-dot{
  width:34px;height:4px;border-radius:99px;border:0;padding:0;cursor:pointer;
  background:rgba(255,255,255,.32);transition:background .2s ease,width .2s ease;
}
.showcase-dot:hover{background:rgba(255,255,255,.6)}
.showcase-dot[aria-selected="true"]{background:var(--cyan-400);width:52px}

.showcase-arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:5;
  width:44px;height:44px;border-radius:50%;border:1px solid rgba(255,255,255,.34);
  background:rgba(4,18,27,.5);color:#fff;font-size:20px;line-height:1;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background .2s ease,border-color .2s ease;
}
.showcase-arrow:hover{background:var(--cyan-500);border-color:var(--cyan-500)}
.showcase-arrow.prev{left:16px}
.showcase-arrow.next{right:16px}

.showcase-badge{
  position:absolute;top:16px;left:24px;z-index:4;
  background:rgba(4,18,27,.62);border:1px solid rgba(255,255,255,.22);
  color:var(--cyan-300);font-size:12px;font-weight:700;letter-spacing:1.4px;
  text-transform:uppercase;padding:6px 12px;border-radius:99px;
}

@media (prefers-reduced-motion:reduce){
  .showcase-slide{transition:opacity .3s ease;transform:none}
  .btn:hover{transform:none}
}
@media(max-width:860px){
  .showcase-arrow{display:none}
  .showcase-captions{position:static;background:rgba(4,18,27,.92);padding:14px 18px;pointer-events:auto}
  .showcase-cap{background:none;padding:0}
  .showcase-track{height:auto}
  .showcase-slide{position:relative;display:none}
  .showcase-slide.is-active{display:block;position:relative}
  .showcase-slide img{height:auto}
  .showcase-badge{display:none}
}

/* ---------- mobile nav ---------- */
@media(max-width:860px){
  .nav-toggle{
    display:inline-flex;align-items:center;gap:8px;margin-left:auto;
    background:rgba(46,155,198,.14);border:1px solid var(--cyan-500);
    color:var(--cyan-300);border-radius:8px;padding:9px 14px;font-size:14px;cursor:pointer;
  }
  nav{
    display:none;width:100%;margin:0;flex-direction:column;gap:0;
    border-top:1px solid var(--line);padding:6px 0;
  }
  nav.is-open{display:flex}
  nav a{padding:11px 0;border-bottom:1px solid var(--line-soft)}
}

/* ==========================================================================
   Cards & product catalogue
   ========================================================================== */
.card-grid{
  display:grid;gap:18px;margin:22px 0;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
}
.card{
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,var(--card) 0%,var(--navy-800) 100%);
  border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
  color:var(--text);
}
.card:hover{
  transform:translateY(-4px);border-color:var(--cyan-500);
  box-shadow:0 14px 34px rgba(0,0,0,.42);text-decoration:none;color:var(--text);
}
.card-media{
  background:#fff;padding:16px;height:190px;
  display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--line-soft);
}
.card-media img{max-height:100%;width:auto;object-fit:contain}
.card-body{padding:16px 18px 20px;display:flex;flex-direction:column;gap:6px;flex:1}
.card-body h3{margin:0;color:#fff;font-size:17px}
.card-body p{margin:0;font-size:14px;color:var(--text-dim);flex:1}
.badge{
  align-self:flex-start;background:rgba(46,155,198,.16);color:var(--cyan-300);
  font-size:11px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;
  padding:4px 10px;border-radius:99px;border:1px solid rgba(46,155,198,.34);
}
.card-cta{
  margin-top:8px;font-size:14px;font-weight:600;color:var(--cyan-400);
  display:inline-flex;align-items:center;gap:6px;
}
.card:hover .card-cta{color:var(--cyan-300)}

/* category section */
.cat-block{margin:0 0 46px}
.cat-head{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:20px;
}
.cat-head h2{margin:0;border-left:0;padding:0}
.cat-num{
  font-size:13px;font-weight:700;letter-spacing:1.4px;color:var(--cyan-400);
  border:1px solid rgba(46,155,198,.4);border-radius:6px;padding:3px 9px;
}
.cat-desc{color:var(--text-dim);font-size:15px;margin:0 0 18px}

/* product table */
.table-wrap{overflow-x:auto;margin:20px 0;border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
th{
  background:var(--navy-700);color:#fff;text-align:left;
  padding:12px 14px;font-weight:600;white-space:nowrap;
}
td{border-bottom:1px solid var(--line-soft);padding:11px 14px;vertical-align:top}
tr:last-child td{border-bottom:0}
tbody tr:nth-child(even){background:rgba(255,255,255,.022)}
tbody tr:hover{background:rgba(46,155,198,.08)}

/* stat row */
.stats{
  display:grid;gap:16px;margin:26px 0;
  grid-template-columns:repeat(auto-fit,minmax(170px,1fr));
}
.stat{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:20px 14px;text-align:center;
}
.stat b{display:block;font-size:26px;color:var(--cyan-400);line-height:1.2}
.stat span{font-size:13px;color:var(--steel-400)}

/* banner band */
.band{
  background:linear-gradient(120deg,var(--navy-700),var(--navy-800));
  border:1px solid var(--line);border-left:4px solid var(--cyan-500);
  border-radius:var(--radius);padding:26px 30px;margin:28px 0;color:var(--text-dim);
}
.band h2{color:#fff;margin-top:0}
.band strong{color:#fff}

.note{
  border-left:4px solid var(--cyan-500);background:rgba(46,155,198,.09);
  padding:14px 18px;border-radius:0 10px 10px 0;margin:18px 0;
}
.note-title{display:block;font-weight:700;color:#fff;margin-bottom:4px}

.flow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:20px 0}
.flow span{
  background:rgba(46,155,198,.12);border:1px solid rgba(46,155,198,.3);
  color:var(--text);border-radius:8px;padding:10px 14px;font-size:14px;font-weight:600;
}
.flow i{color:var(--cyan-400);font-style:normal;font-weight:700}

pre{
  background:#04121B;color:#CFE4EF;padding:16px 18px;border-radius:10px;
  overflow-x:auto;font-size:13px;line-height:1.6;border:1px solid var(--line-soft);
}
code{font-family:Consolas,Monaco,monospace}

/* ---------- footer ---------- */
footer{background:#04121B;color:var(--steel-400);padding:46px 0 26px;margin-top:44px;border-top:1px solid var(--line)}
footer .cols{
  max-width:1220px;margin:0 auto;padding:0 24px;
  display:grid;gap:30px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
}
footer h4{color:#fff;margin:0 0 12px;font-size:15px}
footer p,footer li{font-size:14px;margin:5px 0}
footer ul{list-style:none;padding:0;margin:0}
footer a{color:var(--steel-400)}
footer a:hover{color:var(--cyan-300)}
footer .cp{
  max-width:1220px;margin:28px auto 0;padding:18px 24px 0;
  border-top:1px solid var(--line-soft);font-size:13px;text-align:center;
}
.cat-links{columns:2;column-gap:24px}
.cat-links li{break-inside:avoid}

/* ---------- brand film video ---------- */
.video-block{margin:22px 0 34px}
.brand-film{
  display:block;width:100%;height:auto;
  background:#04121B;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.video-block figcaption{
  margin-top:10px;font-size:14px;color:var(--steel-400);font-style:italic;
}

/* ---------- legacy aliases (kept so preserved content renders) ---------- */
.dsh-cards{display:grid;gap:18px;margin:22px 0;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.dsh-card{
  display:flex;flex-direction:column;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;color:var(--text);
}
.dsh-card:hover{
  transform:translateY(-4px);border-color:var(--cyan-500);
  box-shadow:0 14px 34px rgba(0,0,0,.42);text-decoration:none;color:var(--text);
}
.dsh-card img{width:100%;height:170px;object-fit:contain;background:#fff;padding:12px}
.dsh-card .body{padding:14px 16px 18px;display:flex;flex-direction:column;gap:6px}
.dsh-card .tag{
  align-self:flex-start;background:rgba(46,155,198,.16);color:var(--cyan-300);
  font-size:11px;font-weight:700;letter-spacing:.6px;padding:4px 10px;border-radius:99px;
  border:1px solid rgba(46,155,198,.34);
}
.dsh-card .body b,.dsh-card .body h3{display:block;color:#fff;font-size:16px;margin:0}
.dsh-card .body span,.dsh-card .body p{margin:0;font-size:14px;color:var(--text-dim)}
.dsh-cards .dsh-card .body p{color:var(--text-dim)}

.dsh-numbers{display:grid;gap:16px;margin:24px 0;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.dsh-numbers .n{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:18px 12px;text-align:center;
}
.dsh-numbers b{display:block;font-size:24px;color:var(--cyan-400)}
.dsh-numbers span{font-size:13px;color:var(--steel-400)}

.dsh-band{
  background:linear-gradient(120deg,var(--navy-700),var(--navy-800));
  border:1px solid var(--line);border-left:4px solid var(--cyan-500);
  border-radius:var(--radius);padding:26px 30px;margin:26px 0;color:var(--text-dim);
}
.dsh-band h2{color:#fff;margin-top:0}
.dsh-band strong{color:#fff}

.dsh-cta{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}
.dsh-cta a{
  padding:13px 24px;border-radius:8px;font-weight:600;font-size:15px;
  display:inline-block;transition:transform .16s ease,box-shadow .16s ease;
}
.dsh-cta a:hover{text-decoration:none;transform:translateY(-2px)}
.dsh-cta .primary{background:var(--cyan-500);color:#fff}
.dsh-cta .primary:hover{background:var(--cyan-400);color:#06202e}
.dsh-cta .ghost{border:1px solid var(--cyan-500);color:var(--cyan-300)}
.dsh-cta .ghost:hover{background:rgba(46,155,198,.14);color:#fff}

.VPButton{display:inline-block;padding:13px 26px;border-radius:8px;font-weight:600;font-size:15px}
.VPButton.brand{background:var(--cyan-500);color:#fff}
.VPButton.alt{background:rgba(46,155,198,.14);color:var(--cyan-300);border:1px solid var(--cyan-500)}
.VPButton:hover{text-decoration:none}
.VPHero{padding:10px 0 26px}
.VPHero h1{font-size:40px}
.VPHero .name.clip{
  position:absolute;width:1px;height:1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;
}
.VPHero .tagline{font-size:18px;color:var(--text-dim);max-width:720px}
.VPHero .actions{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}
.VPHero .image-src{max-width:480px;margin:0 auto}

.tip{
  border-left:4px solid var(--cyan-500);background:rgba(46,155,198,.09);
  padding:14px 18px;border-radius:0 10px 10px 0;margin:18px 0;color:var(--text-dim);
}
.vp-doc p{color:var(--text-dim)}
.vp-doc strong,.vp-doc b{color:#fff}
.vp-doc a{color:var(--cyan-400)}
.language-mermaid{
  background:#04121B;border:1px solid var(--line-soft);border-radius:10px;
  padding:16px 18px;overflow-x:auto;font-size:13px;line-height:1.6;color:#CFE4EF;
}
@media(max-width:860px){
  .VPHero h1{font-size:28px}
}
@media(max-width:560px){
  h1{font-size:26px}
  h2{font-size:20px}
  .cat-links{columns:1}
  .card-media{height:165px}
}