/* =========================================================
   SHAH PRECICAST — DESIGN SYSTEM
   Palette: graphite / off-white / industrial grey / rust accent
   Type: Archivo (display) + IBM Plex Sans (body/technical)
   ========================================================= */

:root{
  --graphite: #1B2024;
  --graphite-soft: #2A3136;
  --off-white: #F5F6F3;
  --paper: #FFFFFF;
  --grey-100: #EEF0EF;
  --grey-300: #D6D9D7;
  --grey-500: #8B9390;
  --grey-700: #4B5250;
  --rust: #AD4E20;
  --rust-dark: #8A3E19;
  --line: #DADDDB;
  --ok: #3A6B4C;

  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", Arial, sans-serif;

  --radius-sm: 2px;
  --radius-md: 4px;
  --shadow-card: 0 1px 2px rgba(27,32,36,.06);
  --shadow-hover: 0 8px 24px rgba(27,32,36,.12);

  --container: 1200px;
  --gap: 24px;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --off-white:#14171A; --paper:#1B2024; --grey-100:#20262A;
    --grey-300:#33393D; --grey-700:#C7CBC9; --line:#33393D;
    --graphite:#F5F6F3; --graphite-soft:#E7E9E7;
  }
}
:root[data-theme="dark"]{
  --off-white:#14171A; --paper:#1B2024; --grey-100:#20262A;
  --grey-300:#33393D; --grey-700:#C7CBC9; --line:#33393D;
  --graphite:#F5F6F3; --graphite-soft:#E7E9E7;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0; background:var(--off-white); color:var(--graphite);
  font-family:var(--font-body); font-size:16px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%; display:block;}
a{color:inherit;}
:focus-visible{outline:2px solid var(--rust); outline-offset:2px;}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important; transition-duration:.001ms !important;}
  html{scroll-behavior:auto;}
}

h1,h2,h3,h4{
  font-family:var(--font-display); font-weight:600; letter-spacing:-0.01em;
  margin:0 0 .5em; color:var(--graphite);
}
h1{font-size:clamp(2.1rem,4.2vw,3.4rem); line-height:1.08; font-weight:700;}
h2{font-size:clamp(1.6rem,2.6vw,2.3rem); line-height:1.15;}
h3{font-size:1.2rem; line-height:1.3;}
p{margin:0 0 1em; max-width:62ch; color:var(--grey-700);}
.lede{font-size:1.15rem; color:var(--graphite-soft); max-width:56ch;}

.container{max-width:var(--container); margin:0 auto; padding:0 24px;}
.section{padding:88px 0;}
.section--tight{padding:56px 0;}
.section--alt{background:var(--grey-100);}
.section--dark{background:var(--graphite); color:var(--off-white);}
.section--dark p, .section--dark .lede{color:#C7CBC9;}
.section--dark h2{color:var(--off-white);}

.eyebrow{
  font-size:.78rem; font-weight:600; letter-spacing:.04em;
  color:var(--rust); margin:0 0 10px;
}

.grid{display:grid; gap:var(--gap);}
.grid-2{grid-template-columns:1fr; }
.grid-3{grid-template-columns:1fr; }
.grid-5{grid-template-columns:1fr; }
@media(min-width:720px){
  .grid-2{grid-template-columns:1fr 1fr;}
  .grid-3{grid-template-columns:repeat(3,1fr);}
}
@media(min-width:960px){
  .grid-5{grid-template-columns:repeat(5,1fr);}
}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:14px 24px; font-family:var(--font-body); font-weight:600; font-size:.95rem;
  border-radius:var(--radius-sm); border:1px solid transparent; cursor:pointer;
  text-decoration:none; transition:background-color .15s ease, color .15s ease, border-color .15s ease;
}
.btn-primary{background:var(--rust); color:#fff;}
.btn-primary:hover{background:var(--rust-dark);}
.btn-secondary{background:transparent; color:var(--graphite); border-color:var(--graphite);}
.btn-secondary:hover{background:var(--graphite); color:var(--off-white);}
.section--dark .btn-secondary{color:var(--off-white); border-color:#4B5250;}
.section--dark .btn-secondary:hover{background:var(--off-white); color:var(--graphite);}
.btn-whatsapp{background:#2E5A3E; color:#fff;}
.btn-whatsapp:hover{background:#244A31;}
.btn-block{width:100%; justify-content:center;}

/* Header */
.site-header{
  position:sticky; top:0; z-index:50; background:rgba(245,246,243,.92);
  backdrop-filter:blur(6px); border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 24px; max-width:var(--container); margin:0 auto; gap:20px;
}
.logo{font-family:var(--font-display); font-weight:700; font-size:1.05rem; letter-spacing:.01em; text-decoration:none; color:var(--graphite); white-space:nowrap;}
.logo span{color:var(--rust);}
.main-nav{display:none;}
.main-nav ul{list-style:none; display:flex; gap:28px; margin:0; padding:0;}
.main-nav a{text-decoration:none; font-size:.92rem; font-weight:500; color:var(--graphite-soft); padding:8px 0;}
.main-nav a:hover{color:var(--rust);}
.header-cta{display:none; gap:10px; align-items:center;}
.menu-toggle{
  display:inline-flex; background:none; border:1px solid var(--line); border-radius:var(--radius-sm);
  padding:9px 11px; cursor:pointer;
}
.menu-toggle span, .menu-toggle span::before, .menu-toggle span::after{
  display:block; width:18px; height:2px; background:var(--graphite); position:relative; content:"";
}
.menu-toggle span::before{position:absolute; top:-6px;}
.menu-toggle span::after{position:absolute; top:6px;}
@media(min-width:1040px){
  .main-nav{display:block;}
  .header-cta{display:flex;}
  .menu-toggle{display:none;}
}

/* Mobile nav panel */
.mobile-nav{
  display:none; flex-direction:column; gap:2px; padding:8px 24px 20px; border-top:1px solid var(--line);
  background:var(--paper);
}
.mobile-nav.is-open{display:flex;}
.mobile-nav a{display:block; padding:12px 4px; text-decoration:none; color:var(--graphite); border-bottom:1px solid var(--line); font-size:.98rem;}
@media(min-width:1040px){.mobile-nav{display:none !important;}}

/* Hero */
.hero{
  position:relative; color:#fff; background:linear-gradient(180deg, rgba(20,24,27,.72), rgba(20,24,27,.82)), var(--graphite);
  background-size:cover; background-position:center;
  padding:110px 0 80px;
}
.hero-inner{max-width:720px;}
.hero .eyebrow{color:#E7A87E;}
.hero p.lede{color:#D9DBD8;}
.hero-actions{display:flex; flex-wrap:wrap; gap:14px; margin:28px 0 40px;}
.trust-strip{
  display:flex; flex-wrap:wrap; gap:10px 28px; padding-top:26px; border-top:1px solid rgba(255,255,255,.18);
  font-size:.85rem; color:#C7CBC9;
}
.trust-strip strong{color:#fff; font-weight:600;}

/* Cards */
.card{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius-md);
  padding:26px; box-shadow:var(--shadow-card); transition:box-shadow .15s ease, transform .15s ease;
}
.card:hover{box-shadow:var(--shadow-hover); transform:translateY(-2px);}
.card h3{margin-bottom:8px;}
.card p{margin-bottom:0; font-size:.95rem;}
.card-link{display:inline-block; margin-top:14px; font-size:.88rem; font-weight:600; color:var(--rust); text-decoration:none;}
.card-link:hover{text-decoration:underline;}

.product-card{position:relative; overflow:hidden; border-radius:var(--radius-md); background:var(--graphite); color:#fff; min-height:280px; display:flex; align-items:flex-end; padding:26px; border:1px solid var(--line);}
.product-card::before{content:""; position:absolute; inset:0; background:linear-gradient(180deg, rgba(27,32,36,.15), rgba(15,17,19,.86));}
.product-card-content{position:relative; z-index:1;}
.product-card h3{color:#fff; margin-bottom:6px;}
.product-card p{color:#D9DBD8; font-size:.9rem;}

/* Process strip */
.process-strip{display:flex; flex-wrap:wrap; gap:0; border:1px solid var(--line); border-radius:var(--radius-md); overflow:hidden; background:var(--paper);}
.process-step{flex:1 1 130px; padding:18px 16px; border-right:1px solid var(--line); border-bottom:1px solid var(--line); font-size:.85rem;}
.process-step:last-child{border-right:none;}
.process-step .num{font-family:var(--font-display); font-weight:700; color:var(--rust); font-size:.85rem; display:block; margin-bottom:6px;}

/* Stat */
.stat{padding:20px 0;}
.stat .value{font-family:var(--font-display); font-weight:700; font-size:2.1rem; color:var(--graphite); display:block; line-height:1;}
.section--dark .stat .value{color:#fff;}
.stat .label{font-size:.85rem; color:var(--grey-700); margin-top:6px;}
.section--dark .stat .label{color:#B9BEBB;}

/* Certification badges */
.cert-badge{border:1px solid var(--line); border-radius:var(--radius-md); background:var(--paper); padding:18px; text-align:left;}
.cert-badge .code{font-family:var(--font-display); font-weight:700; font-size:1.05rem;}
.cert-badge .desc{font-size:.82rem; color:var(--grey-700); margin-top:4px;}
.cert-badge.is-pending{border-style:dashed; opacity:.6;}

/* Footer */
.site-footer{background:var(--graphite); color:#C7CBC9; padding:64px 0 28px; font-size:.9rem;}
.site-footer a{color:#E7E9E7; text-decoration:none;}
.site-footer a:hover{color:var(--rust);}
.footer-grid{display:grid; gap:32px; grid-template-columns:1fr; margin-bottom:40px;}
@media(min-width:760px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;}}
.footer-grid h4{color:#fff; font-family:var(--font-display); font-size:.9rem; letter-spacing:.02em; margin-bottom:14px;}
.footer-grid ul{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:8px;}
.footer-bottom{border-top:1px solid #33393D; padding-top:24px; display:flex; flex-wrap:wrap; gap:12px; justify-content:space-between; font-size:.8rem; color:#8B9390;}

/* Floating contact widget */
.floating-contact{
  position:fixed; right:22px; bottom:22px; z-index:60; display:none; flex-direction:column; gap:10px;
}
@media(min-width:760px){.floating-contact{display:flex;}}
.fc-btn{
  width:48px; height:48px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  background:var(--paper); border:1px solid var(--line); box-shadow:var(--shadow-card); cursor:pointer; text-decoration:none;
  color:var(--graphite); font-size:1rem; transition:transform .15s ease, background .15s ease;
}
.fc-btn:hover{transform:scale(1.06); background:var(--grey-100);}
.fc-btn.fc-rfq{background:var(--rust); color:#fff; border-color:var(--rust);}
.fc-btn.fc-whatsapp{background:#2E5A3E; color:#fff; border-color:#2E5A3E;}

.mobile-bottom-bar{
  display:flex; position:fixed; left:0; right:0; bottom:0; z-index:60; background:var(--paper);
  border-top:1px solid var(--line); padding:8px 6px calc(8px + env(safe-area-inset-bottom));
  box-shadow:0 -4px 16px rgba(0,0,0,.08);
}
@media(min-width:760px){.mobile-bottom-bar{display:none;}}
.mbb-item{flex:1; display:flex; flex-direction:column; align-items:center; gap:4px; text-decoration:none; color:var(--graphite-soft); font-size:.72rem; font-weight:600; padding:6px 0;}
.mbb-item.mbb-primary{color:var(--rust);}

/* Forms */
.field{margin-bottom:18px;}
.field label{display:block; font-size:.85rem; font-weight:600; margin-bottom:6px; color:var(--graphite);}
.field .hint{font-size:.78rem; color:var(--grey-500); margin-top:4px;}
.field input, .field select, .field textarea{
  width:100%; padding:12px 14px; border:1px solid var(--grey-300); border-radius:var(--radius-sm);
  font-family:var(--font-body); font-size:.95rem; background:var(--paper); color:var(--graphite);
}
.field input:focus, .field select:focus, .field textarea:focus{border-color:var(--rust);}
.field-row{display:grid; gap:18px; grid-template-columns:1fr;}
@media(min-width:640px){.field-row-2{grid-template-columns:1fr 1fr;}}
fieldset{border:none; padding:0; margin:0 0 36px;}
legend{font-family:var(--font-display); font-weight:700; font-size:1.05rem; margin-bottom:18px; padding:0; color:var(--graphite);}
.upload-zone{
  border:1.5px dashed var(--grey-300); border-radius:var(--radius-md); padding:32px 20px; text-align:center;
  background:var(--grey-100); cursor:pointer;
}
.upload-zone.is-dragover{border-color:var(--rust); background:#FBEFE6;}
.upload-list{list-style:none; margin:14px 0 0; padding:0; font-size:.85rem;}
.upload-list li{display:flex; justify-content:space-between; padding:8px 10px; border:1px solid var(--line); border-radius:var(--radius-sm); margin-bottom:6px; background:var(--paper);}
.upload-list button{background:none; border:none; color:var(--rust); cursor:pointer; font-size:.85rem;}
.honeypot{position:absolute; left:-9999px; opacity:0;}
.form-status{padding:16px 18px; border-radius:var(--radius-sm); margin-top:20px; font-size:.92rem; display:none;}
.form-status.is-visible{display:block;}
.form-status.is-success{background:#E7F0EA; border:1px solid var(--ok); color:#20402C;}
.form-status.is-error{background:#FBEBE4; border:1px solid var(--rust); color:var(--rust-dark);}

.breadcrumb{font-size:.82rem; color:var(--grey-500); margin-bottom:18px;}
.breadcrumb a{text-decoration:none; color:var(--grey-500);}
.breadcrumb a:hover{color:var(--rust);}

table{width:100%; border-collapse:collapse; font-size:.9rem;}
th,td{text-align:left; padding:12px 14px; border-bottom:1px solid var(--line);}
th{font-family:var(--font-display); font-weight:600; color:var(--graphite); background:var(--grey-100);}
.table-scroll{overflow-x:auto; border:1px solid var(--line); border-radius:var(--radius-md);}
.table-scroll table{margin:0; border:none;}

.skip-link{position:absolute; left:-9999px; top:0; background:var(--rust); color:#fff; padding:10px 16px; z-index:100;}
.skip-link:focus{left:12px; top:12px;}

/* =========================================================
   MEGA MENU (added Phase 2 continuation)
   ========================================================= */
.mega-nav{list-style:none; display:flex; gap:26px; margin:0; padding:0;}
.mega-nav > li{position:relative;}
.mega-nav > li > a{text-decoration:none; font-size:.92rem; font-weight:500; color:var(--graphite-soft); padding:8px 0; display:inline-block;}
.mega-nav > li > a:hover{color:var(--rust);}
.has-mega .mega-panel{
  display:none; position:absolute; top:100%; left:50%; transform:translateX(-50%);
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius-md);
  box-shadow:var(--shadow-hover); padding:22px 26px; gap:32px; z-index:70;
  min-width:520px;
}
.has-mega:hover .mega-panel,
.has-mega:focus-within .mega-panel{display:flex;}
.mega-panel{display:none;}
.mega-col{min-width:150px;}
.mega-col h4{font-family:var(--font-display); font-size:.78rem; font-weight:700; letter-spacing:.03em; color:var(--rust); margin:0 0 10px;}
.mega-col a{display:block; text-decoration:none; color:var(--graphite-soft); font-size:.87rem; padding:5px 0;}
.mega-col a:hover{color:var(--rust);}

/* Mobile accordion nav */
.mobile-accordion{border-bottom:1px solid var(--line);}
.mobile-accordion summary{padding:12px 4px; cursor:pointer; font-size:.98rem; color:var(--graphite); list-style:none; display:flex; justify-content:space-between;}
.mobile-accordion summary::after{content:"+"; color:var(--grey-500);}
.mobile-accordion[open] summary::after{content:"–";}
.mobile-accordion summary::-webkit-details-marker{display:none;}
.mobile-accordion a{display:block; padding:10px 16px; text-decoration:none; color:var(--grey-700); font-size:.92rem;}

/* Machine gallery filter chips */
.filter-bar{display:flex; flex-wrap:wrap; gap:8px; margin-bottom:28px;}
.filter-chip{
  border:1px solid var(--line); background:var(--paper); border-radius:20px; padding:8px 16px;
  font-size:.82rem; font-weight:500; cursor:pointer; color:var(--grey-700);
}
.filter-chip.is-active{background:var(--graphite); color:#fff; border-color:var(--graphite);}
.machine-card{display:none;}
.machine-card.is-visible{display:block;}

/* Gallery tiles */
.gallery-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(220px,1fr)); gap:16px;}
.gallery-tile{
  aspect-ratio:4/3; border-radius:var(--radius-md); border:1px solid var(--line); background:var(--grey-100);
  display:flex; align-items:center; justify-content:center; text-align:center; padding:16px; position:relative;
}
.gallery-tile .cat{position:absolute; top:10px; left:10px; font-size:.7rem; background:var(--graphite); color:#fff; padding:3px 9px; border-radius:20px;}
.gallery-tile .pending{font-size:.8rem; color:var(--grey-500);}

/* Cert card pending state */
.cert-card{border:1px solid var(--line); border-radius:var(--radius-md); padding:24px; background:var(--paper);}
.cert-card .code{font-family:var(--font-display); font-weight:700; font-size:1.1rem;}
.cert-card .scope{font-size:.88rem; color:var(--grey-700); margin:8px 0 14px;}
.cert-card .pending-state{border:1px dashed var(--grey-300); border-radius:var(--radius-sm); padding:12px; font-size:.8rem; color:var(--grey-500); text-align:center;}

/* Data table filter (materials grade matrix) */
.matrix-controls{display:flex; gap:12px; flex-wrap:wrap; margin-bottom:18px;}
.matrix-controls input, .matrix-controls select{padding:10px 14px; border:1px solid var(--grey-300); border-radius:var(--radius-sm); font-family:var(--font-body); font-size:.9rem;}