/* ==========================================================================
   Lane Aluminum — Responsive Static Site
   Hand-written CSS. Mobile-first, no framework.
   ========================================================================== */

/* ---------- Design tokens ----------
   Palette sampled from the live site's compiled Avada stylesheet:
   --awb-color4 #2998ff / --awb-color5 #171e60 / footer #363839 /
   body text #212934 / primary-link #171e60                       */
:root{
  --navy:#171e60;          /* deep blue — dark sections (awb-color5) */
  --navy-2:#212934;        /* near-black blue — body/headings         */
  --steel:#434549;         /* neutral steel grey                      */
  --alu:#c9d1d9;
  --accent:#171e60;        /* primary blue — links & interaction (主题蓝/Logo同色) */
  --accent-dark:#101440;
  --blue:#2998ff;          /* accent blue (awb-color4)                 */
  --ink:#212934;
  --ink-2:#4a4e57;
  --ink-3:#747474;
  --line:#e5e5e5;
  --bg:#ffffff;
  --bg-soft:#f9f9fb;
  --bg-dark:#363839;       /* footer background                        */
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 1px 2px rgba(16,32,48,.05),0 6px 20px rgba(16,32,48,.06);
  --shadow-lg:0 12px 40px rgba(16,32,48,.12);
  --maxw:1180px;
  --gap:clamp(16px,3vw,28px);
  --header-h:70px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px);}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--navy-2);text-decoration:none;}
a:hover{color:var(--accent);}
ul,ol{margin:0 0 1rem;padding-left:1.25rem;}
li{margin:.35rem 0;}
h1,h2,h3,h4{line-height:1.25;color:var(--navy);margin:0 0 .6em;font-weight:700;letter-spacing:-.01em;}
h1{font-size:clamp(1.85rem,4.5vw,3rem);}
h2{font-size:clamp(1.45rem,3.2vw,2.1rem);}
h3{font-size:clamp(1.15rem,2.2vw,1.4rem);}
h4{font-size:1.05rem;}
p{margin:0 0 1rem;}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0;}

/* ---------- Layout helpers ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(16px,4vw,28px);}
.section{padding-block:clamp(48px,8vw,88px);}
.section--soft{background:var(--bg-soft);}
.section--dark{background:var(--bg-dark);color:#dfe7ef;}
.section--dark h1,.section--dark h2,.section--dark h3{color:#fff;}
.section__head{max-width:720px;margin:0 auto clamp(28px,5vw,48px);text-align:center;}
.section__head p{color:var(--ink-2);margin-bottom:0;}
.grid{display:grid;gap:var(--gap);}
.grid--2{grid-template-columns:1fr;}
.grid--3{grid-template-columns:1fr;}
.grid--4{grid-template-columns:1fr;}
@media(min-width:640px){
  .grid--2{grid-template-columns:repeat(2,1fr);}
  .grid--3{grid-template-columns:repeat(2,1fr);}
  .grid--4{grid-template-columns:repeat(2,1fr);}
}
@media(min-width:960px){
  .grid--3{grid-template-columns:repeat(3,1fr);}
  .grid--4{grid-template-columns:repeat(4,1fr);}
}
.text-center{text-align:center;}
.mt-0{margin-top:0;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.8em 1.6em;border-radius:var(--radius-sm);border:2px solid transparent;
  font-weight:600;font-size:.95rem;cursor:pointer;transition:.18s ease;
  text-align:center;line-height:1.2;
}
.btn--primary{background:var(--accent);color:#fff;}
.btn--primary:hover{background:var(--accent-dark);color:#fff;transform:translateY(-1px);}
.btn--ghost{border-color:var(--navy);color:var(--navy);background:transparent;}
.btn--ghost:hover{background:var(--navy);color:#fff;}
.btn--light{border-color:rgba(255,255,255,.5);color:#fff;background:transparent;}
.btn--light:hover{background:#fff;color:var(--navy);}
.btn--block{width:100%;}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid var(--line);
}
.site-header__bar{
  display:flex;align-items:center;gap:16px;
  min-height:var(--header-h);
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
/* Logo 响应式：手机 34px → 平板 40px → 桌面 44px，高清屏自动加载 2x/3x 图 */
.brand img{height:clamp(34px,4.6vw,44px);width:auto;}
.brand__txt{font-weight:800;color:var(--navy);font-size:1.05rem;letter-spacing:-.02em;display:none;}
@media(min-width:420px){.brand__txt{display:block;}}

.nav{margin-left:auto;display:flex;align-items:center;}
.nav__menu{display:none;list-style:none;margin:0;padding:0;align-items:center;gap:2px;}
.nav__menu a{
  display:block;padding:.55em .8em;border-radius:6px;color:var(--ink);
  font-size:.94rem;font-weight:500;white-space:nowrap;
}
.nav__menu a:hover{color:var(--accent);background:var(--bg-soft);}
.nav__menu a[aria-current="page"]{color:var(--accent);font-weight:700;}

.nav__cta{display:none;margin-left:10px;padding:.6em 1.2em;font-size:.9rem;}
@media(min-width:1080px){
  .nav__menu{display:flex;}
  .nav__cta{display:inline-flex;}
}

/* Dropdown */
.has-drop{position:relative;}
.has-drop>a::after{content:"";display:inline-block;width:.42em;height:.42em;
  margin-left:.42em;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
  transform:rotate(45deg) translateY(-.12em);}
.drop{
  position:absolute;top:100%;left:0;min-width:210px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);
  padding:8px;margin:6px 0 0;list-style:none;
  opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s ease;
}
.has-drop:hover .drop,.has-drop:focus-within .drop{opacity:1;visibility:visible;transform:translateY(0);}
.drop a{display:block;padding:.5em .8em;border-radius:6px;font-size:.9rem;}
.drop a:hover{background:var(--bg-soft);}

/* Burger */
.burger{
  margin-left:auto;display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:10px;background:transparent;border:1px solid var(--line);
  border-radius:8px;cursor:pointer;
}
.burger span{display:block;height:2px;background:var(--navy);border-radius:2px;transition:.2s;}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
@media(min-width:1080px){.burger{display:none;}}

/* Mobile drawer */
.nav__mobile{
  display:none;border-top:1px solid var(--line);background:#fff;
  max-height:calc(100vh - var(--header-h));overflow-y:auto;
}
.nav__mobile.is-open{display:block;}
.nav__mobile ul{list-style:none;margin:0;padding:8px 0;}
.nav__mobile>ul>li>a{display:block;padding:.75em 0;font-weight:600;color:var(--navy);border-bottom:1px solid var(--line);}
.nav__mobile .sub{list-style:none;margin:0;padding:4px 0 8px 14px;}
.nav__mobile .sub a{padding:.35em 0;font-size:.92rem;color:var(--ink-2);}
.nav__mobile .nav__cta{display:inline-flex;margin:12px 0 20px;}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 60%,#2a3372 100%);
  padding-block:clamp(56px,10vw,110px);
}
.hero::after{
  content:"";position:absolute;inset:0;opacity:.14;pointer-events:none;
  background:repeating-linear-gradient(115deg,transparent 0 18px,rgba(255,255,255,.5) 18px 20px);
}
.hero__inner{position:relative;z-index:1;max-width:760px;}
.hero h1{color:#fff;margin-bottom:.35em;}
.hero__eyebrow{
  display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:#c3cbf7;background:rgba(255,255,255,.10);border:1px solid rgba(195,203,247,.45);
  padding:.4em 1em;border-radius:999px;margin-bottom:1.2em;
}
.hero p{color:#d5e0ea;font-size:clamp(1rem,1.6vw,1.15rem);max-width:620px;}
.hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:1.8em;}

/* ---------- Cards ---------- */
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);transition:.2s ease;height:100%;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#d3dbe3;}
.card__media{aspect-ratio:4/3;background:var(--bg-soft);overflow:hidden;}
.card__media img{width:100%;height:100%;object-fit:cover;transition:.4s ease;}
.card:hover .card__media img{transform:scale(1.05);}
.card__body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1;}
.card__body h3{margin-bottom:.4em;}
.card__body p{color:var(--ink-2);font-size:.94rem;flex:1;}
.card__link{font-weight:600;color:var(--accent);font-size:.92rem;}
.card__link::after{content:" \2192";}

/* Icon feature */
.feature{padding:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);height:100%;}
.feature__ico{
  width:46px;height:46px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;font-weight:800;
  font-size:1.05rem;margin-bottom:14px;
}
.feature h3{font-size:1.08rem;margin-bottom:.35em;}
.feature p{color:var(--ink-2);font-size:.92rem;margin:0;}

/* ---------- Split (image + text) ---------- */
.split{display:grid;gap:clamp(24px,5vw,56px);align-items:center;}
@media(min-width:900px){.split{grid-template-columns:1fr 1fr;}.split--rev .split__media{order:2;}}
.split__media img{border-radius:var(--radius);box-shadow:var(--shadow-lg);width:100%;}
.split__body ul{padding-left:1.1rem;}
.split__body li{color:var(--ink-2);}

/* ---------- Checklist ---------- */
.ticks{list-style:none;padding:0;margin:0;}
.ticks li{position:relative;padding-left:1.75em;color:var(--ink-2);}
.ticks li::before{
  content:"";position:absolute;left:0;top:.55em;width:.55em;height:.3em;
  border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg);
}

/* ---------- Stats band ---------- */
.stats{display:grid;gap:20px;grid-template-columns:repeat(2,1fr);}
@media(min-width:760px){.stats{grid-template-columns:repeat(4,1fr);}}
.stat{text-align:center;padding:20px 12px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);}
.stat b{display:block;font-size:clamp(1.5rem,4vw,2.3rem);color:#fff;line-height:1.15;}
.stat span{font-size:.85rem;color:#b9c8d6;}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{
  background:linear-gradient(135deg,var(--navy),var(--navy-2));
  color:#fff;padding-block:clamp(40px,7vw,72px);
}
.page-hero h1{color:#fff;margin-bottom:.25em;}
.page-hero p{color:#cfdbe6;margin:0;max-width:680px;}
.breadcrumb{font-size:.85rem;color:#9fb3c6;margin-bottom:1em;}
.breadcrumb a{color:#cfdbe6;}
.breadcrumb a:hover{color:#fff;}

/* ---------- Prose (article body) ---------- */
.prose{max-width:820px;margin-inline:auto;font-size:1.02rem;}
.prose h2{margin-top:2em;}
.prose h3{margin-top:1.6em;color:var(--navy-2);}
.prose ul,.prose ol{color:var(--ink-2);}
.prose strong{color:var(--navy);}
.prose .lead{font-size:1.12rem;color:var(--ink-2);}

/* ---------- FAQ accordion ---------- */
.faq{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;}
.faq details{border-bottom:1px solid var(--line);}
.faq details:last-child{border-bottom:0;}
.faq summary{
  cursor:pointer;padding:18px 22px;font-weight:600;color:var(--navy);
  list-style:none;position:relative;padding-right:52px;font-size:1rem;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{
  content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);
  font-size:1.4rem;font-weight:400;color:var(--accent);transition:.2s;line-height:1;
}
.faq details[open] summary::after{content:"\2013";}
.faq summary:hover{background:var(--bg-soft);}
.faq .faq__a{padding:0 22px 20px;color:var(--ink-2);font-size:.96rem;}

/* ---------- Table ---------- */
.spec{width:100%;border-collapse:collapse;font-size:.94rem;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
.spec th,.spec td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top;}
.spec th{background:var(--bg-soft);font-weight:600;color:var(--navy);white-space:nowrap;}
.spec tr:last-child td{border-bottom:0;}

/* ---------- Contact ---------- */
.contact-grid{display:grid;gap:var(--gap);}
@media(min-width:900px){.contact-grid{grid-template-columns:1.1fr .9fr;}}
.form-field{margin-bottom:16px;}
.form-field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px;color:var(--navy);}
.form-field input,.form-field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);
  font:inherit;font-size:.95rem;background:#fff;transition:.15s;
}
.form-field input:focus,.form-field textarea:focus{outline:none;border-color:var(--steel);box-shadow:0 0 0 3px rgba(65,100,140,.15);}
.info-list{list-style:none;padding:0;margin:0;}
.info-list li{padding:16px 0;border-bottom:1px solid var(--line);}
.info-list li:last-child{border-bottom:0;}
.info-list b{display:block;color:var(--navy);font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px;}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;}
.cta-band h2{color:#fff;margin-bottom:.3em;}
.cta-band p{color:#dfe4fb;margin-bottom:1.4em;}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-dark);color:#a9bbc9;padding-block:clamp(44px,6vw,64px) 0;font-size:.92rem;}
.site-footer h4{color:#fff;font-size:.95rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:1em;}
.site-footer a{color:#c2d2df;}
.site-footer a:hover{color:#fff;}
.footer-grid{display:grid;gap:30px;grid-template-columns:1fr;}
@media(min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:960px){.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;}}
.footer-list{list-style:none;padding:0;margin:0;}
.footer-list li{margin:.45rem 0;}
.footer-bottom{
  margin-top:clamp(32px,5vw,52px);border-top:1px solid rgba(255,255,255,.12);
  padding-block:22px;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:.85rem;color:#8296a6;
}
.social{display:flex;gap:10px;flex-wrap:wrap;}
.social a{
  display:grid;place-items:center;width:36px;height:36px;border-radius:8px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);
  font-size:.78rem;font-weight:700;color:#dfe9f1;
}
.social a:hover{background:var(--accent);color:#fff;border-color:var(--accent);}

/* ---------- Utilities ---------- */
.skip-link{
  position:absolute;left:-999px;top:0;z-index:200;background:var(--accent);color:#fff;
  padding:10px 18px;border-radius:0 0 8px 0;font-weight:600;
}
.skip-link:focus{left:0;}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

/* Product grid on products page */
.prod-card{display:flex;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);transition:.2s;height:100%;}
.prod-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:#d3dbe3;}
.prod-card__img{width:84px;height:84px;flex-shrink:0;border-radius:10px;overflow:hidden;background:var(--bg-soft);}
.prod-card__img img{width:100%;height:100%;object-fit:cover;}
.prod-card__body h3{font-size:1.02rem;margin-bottom:.2em;}
.prod-card__body p{font-size:.86rem;color:var(--ink-3);margin:0;}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
}