/* ==========================================================================
   SRI RENUKA YELLAMMA ENGINEERING — Design System
   Concept: "Shop-floor nameplate + blueprint." Every panel reads like a
   stamped machine plate; every diagram borrows the vocabulary of a
   technical drawing (dimension lines, tolerance callouts, crosshairs).
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  /* Color tokens */
  --graphite:      #14171A;   /* primary dark bg */
  --panel:         #1E2226;   /* raised dark panel */
  --panel-line:    #2C3136;   /* hairline on dark */
  --steel:         #9BA3AC;   /* muted steel gray text on dark */
  --paper:         #EDEAE2;   /* warm steel/paper light bg */
  --paper-panel:   #FFFFFF;
  --ink:           #1A1D21;   /* body text on light */
  --ink-soft:      #565D64;
  --orange:        #E8600C;   /* safety-orange accent */
  --orange-dark:   #C24E08;
  --blue:          #2F5D9B;   /* blueprint blue, used sparingly */
  --line:          #D8D3C7;   /* hairline on light */

  --font-display: 'Oswald', 'Arial Narrow', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --container: 1180px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family:var(--font-body);
  background:var(--paper);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
button{ font-family:inherit; cursor:pointer; }
.container{ max-width:var(--container); margin:0 auto; padding:0 24px; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

/* ---------- Blueprint grid background ---------- */
.blueprint-bg{
  background-color:var(--graphite);
  background-image:
    linear-gradient(rgba(155,163,172,.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155,163,172,.09) 1px, transparent 1px),
    linear-gradient(rgba(155,163,172,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155,163,172,.16) 1px, transparent 1px);
  background-size:14px 14px, 14px 14px, 70px 70px, 70px 70px;
}

/* ---------- Eyebrow / tags ---------- */
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--orange); font-weight:500;
}
.eyebrow::before{ content:''; width:18px; height:2px; background:var(--orange); display:inline-block; }

h1,h2,h3,h4{ font-family:var(--font-display); font-weight:600; letter-spacing:.01em; line-height:1.12; color:var(--ink); }
.on-dark h1,.on-dark h2,.on-dark h3,.on-dark h4,.on-dark p,.on-dark span{ color:var(--paper); }

h1{ font-size:clamp(38px,6vw,68px); text-transform:uppercase; }
h2{ font-size:clamp(28px,4vw,42px); text-transform:uppercase; }
h3{ font-size:20px; text-transform:uppercase; }

p{ color:var(--ink-soft); }
.on-dark p{ color:var(--steel); }

/* =========================== HEADER / NAV =========================== */
.topbar{
  background:var(--graphite); color:var(--steel);
  font-family:var(--font-mono); font-size:12px; letter-spacing:.04em;
}
.topbar .container{
  display:flex; justify-content:space-between; align-items:center;
  padding-top:8px; padding-bottom:8px; flex-wrap:wrap; gap:6px;
}
.topbar a{ color:var(--steel); }
.topbar .topbar-orange{ color:var(--orange); }

.site-header{
  background:var(--paper);
  border-bottom:1px solid var(--line);
  position:sticky; top:0; z-index:100;
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  height:78px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:42px; height:42px; border:2px solid var(--ink); border-radius:4px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-display); font-weight:700; font-size:16px;
  transform:rotate(0deg); position:relative;
}
.brand-mark::after{
  content:''; position:absolute; inset:-6px; border:1px dashed var(--orange);
  border-radius:8px; opacity:.6;
}
.brand-name{ font-family:var(--font-display); font-size:16px; letter-spacing:.03em; text-transform:uppercase; line-height:1.15; }
.brand-name small{ display:block; font-family:var(--font-mono); font-size:10px; color:var(--ink-soft); letter-spacing:.12em; font-weight:400; text-transform:uppercase; margin-top:2px; }

.main-nav{ display:flex; align-items:center; gap:2px; }
.main-nav > ul{ display:flex; align-items:center; gap:2px; }
.main-nav a{
  display:flex; align-items:center; gap:4px;
  padding:10px 16px; font-family:var(--font-mono); font-size:12.5px;
  letter-spacing:.06em; text-transform:uppercase; color:var(--ink); font-weight:500;
  border-radius:3px; transition:background .15s,color .15s;
}
.main-nav a:hover, .main-nav li.active > a{ background:var(--graphite); color:var(--paper); }
.has-sub{ position:relative; }
.sub-nav{
  display:none; position:absolute; top:100%; left:0; min-width:230px;
  background:var(--graphite); border:1px solid var(--panel-line); border-top:2px solid var(--orange);
  padding:6px; z-index:50; box-shadow:0 18px 34px rgba(0,0,0,.25);
}
.has-sub:hover .sub-nav{ display:block; }
.sub-nav a{ color:var(--steel); padding:9px 12px; border-radius:2px; font-size:12px; }
.sub-nav a:hover{ background:var(--panel); color:var(--paper); }

.nav-cta{
  background:var(--orange); color:#fff !important; padding:10px 20px !important;
  border-radius:2px; margin-left:6px;
}
.nav-cta:hover{ background:var(--orange-dark) !important; color:#fff !important; }

.nav-toggle{ display:none; background:none; border:2px solid var(--ink); padding:8px 10px; border-radius:3px; }
.nav-toggle span{ display:block; width:20px; height:2px; background:var(--ink); margin:4px 0; }

@media (max-width: 980px){
  .main-nav{ display:none; position:absolute; top:78px; left:0; right:0; background:var(--paper); border-bottom:1px solid var(--line); flex-direction:column; padding:10px; }
  .main-nav.open{ display:flex; }
  .main-nav > ul{ flex-direction:column; width:100%; align-items:stretch; }
  .sub-nav{ position:static; display:block; border:none; background:var(--panel); margin:2px 0 8px 12px; }
  .nav-toggle{ display:block; }
  .nav-cta{ margin:8px 0 0; text-align:center; }
}

/* =========================== BUTTONS =========================== */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--font-mono); font-size:13px; letter-spacing:.06em; text-transform:uppercase;
  font-weight:500; padding:14px 26px; border-radius:2px; border:1px solid transparent;
  transition:transform .15s ease, background .15s, color .15s, border-color .15s;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{ background:var(--orange); color:#fff; }
.btn-primary:hover{ background:var(--orange-dark); }
.btn-outline{ border-color:currentColor; color:var(--paper); }
.btn-outline:hover{ background:var(--paper); color:var(--ink); }
.btn-outline-dark{ border-color:var(--ink); color:var(--ink); }
.btn-outline-dark:hover{ background:var(--ink); color:var(--paper); }
.btn-arrow{ font-size:16px; transition:transform .15s; }
.btn:hover .btn-arrow{ transform:translateX(4px); }

/* =========================== HERO =========================== */
.hero{ position:relative; padding:96px 0 110px; overflow:hidden; }
.hero .container{ position:relative; z-index:2; display:grid; grid-template-columns:1.15fr .85fr; gap:40px; align-items:center; }
.hero h1{ margin:16px 0 22px; }
.hero h1 .accent{ color:var(--orange); }
.hero-lede{ font-size:17px; max-width:46ch; margin-bottom:34px; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }

.hero-plate{
  border:1px solid var(--panel-line); background:var(--panel);
  padding:26px; position:relative;
}
.hero-plate::before,.hero-plate::after,.hero-plate .bolt{ content:''; }
.corner-bolt{
  position:absolute; width:10px; height:10px; border-radius:50%;
  background:radial-gradient(circle at 35% 30%, #C9CDD3, #5b6167 70%);
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.4);
}
.corner-bolt.tl{ top:10px; left:10px; } .corner-bolt.tr{ top:10px; right:10px; }
.corner-bolt.bl{ bottom:10px; left:10px; } .corner-bolt.br{ bottom:10px; right:10px; }
.plate-label{ font-family:var(--font-mono); font-size:11px; letter-spacing:.14em; color:var(--orange); text-transform:uppercase; margin-bottom:14px; }
.plate-grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px 20px; }
.plate-stat b{ display:block; font-family:var(--font-mono); font-size:28px; color:var(--paper); }
.plate-stat span{ font-size:11px; letter-spacing:.06em; text-transform:uppercase; color:var(--steel); }
.plate-divider{ grid-column:1/-1; border-top:1px dashed var(--panel-line); margin:2px 0; }
.plate-tolerance{ font-family:var(--font-mono); font-size:12px; color:var(--steel); grid-column:1/-1; }
.plate-tolerance b{ color:var(--orange); }

@media (max-width:900px){
  .hero .container{ grid-template-columns:1fr; }
  .hero{ padding:56px 0 60px; }
}

/* =========================== SECTION SHELLS =========================== */
section{ padding:88px 0; }
.section-dark{ background:var(--graphite); }
.section-head{ display:flex; justify-content:space-between; align-items:flex-end; gap:24px; margin-bottom:48px; flex-wrap:wrap; }
.section-head h2{ margin-top:12px; max-width:640px; }
.section-head p{ max-width:420px; }

/* =========================== ICONS (line-art, blueprint style) =========================== */
.icon{ width:46px; height:46px; }
.icon path,.icon circle,.icon rect,.icon line,.icon polygon{ stroke:currentColor; fill:none; stroke-width:1.6; }

/* =========================== SERVICE CARDS =========================== */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:26px; }
.grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:22px; }
@media (max-width:980px){ .grid-3,.grid-4{ grid-template-columns:repeat(2,1fr);} }
@media (max-width:620px){ .grid-3,.grid-4,.grid-2{ grid-template-columns:1fr;} }

.service-card{
  background:var(--paper-panel); border:1px solid var(--line); padding:30px 26px;
  position:relative; transition:transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.service-card:hover{ transform:translateY(-5px); box-shadow:0 20px 40px rgba(20,23,26,.10); border-color:var(--orange); }
.service-card .icon{ color:var(--orange); margin-bottom:18px; }
.service-card .index{ position:absolute; top:22px; right:24px; font-family:var(--font-mono); font-size:12px; color:var(--line); }
.service-card h3{ margin-bottom:10px; font-size:18px; }
.service-card p{ font-size:14.5px; margin-bottom:16px; }
.service-card .more{ font-family:var(--font-mono); font-size:12px; letter-spacing:.06em; text-transform:uppercase; color:var(--ink); border-bottom:1px solid var(--ink); padding-bottom:2px; }
.service-card:hover .more{ color:var(--orange); border-color:var(--orange); }

/* =========================== ABOUT / SPLIT =========================== */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
@media (max-width:900px){ .split{ grid-template-columns:1fr; gap:36px; } }
.diagram-frame{
  border:1px solid var(--line); background:var(--paper-panel); padding:20px; position:relative;
}
.diagram-frame .plate-label{ color:var(--blue); }
.dim-line{ stroke:var(--ink-soft); stroke-width:1; }

.checklist{ margin-top:22px; }
.checklist li{ display:flex; align-items:flex-start; gap:12px; padding:9px 0; border-bottom:1px solid var(--line); font-size:14.5px; color:var(--ink-soft); }
.checklist li:last-child{ border-bottom:none; }
.checklist .tick{ color:var(--orange); font-family:var(--font-mono); font-weight:600; }

/* =========================== STATS STRIP =========================== */
.stats-strip{ background:var(--ink); }
.stats-strip .grid-4{ text-align:center; }
.stat b{ display:block; font-family:var(--font-mono); font-size:44px; color:var(--paper); }
.stat span{ font-family:var(--font-mono); font-size:11.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--steel); }

/* =========================== PROCESS =========================== */
.process-strip{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; border:1px solid var(--panel-line); }
.process-step{ padding:30px 24px; border-right:1px solid var(--panel-line); position:relative; }
.process-step:last-child{ border-right:none; }
.process-step .num{ font-family:var(--font-mono); font-size:34px; color:var(--panel-line); display:block; margin-bottom:14px; }
.process-step h4{ font-size:15px; margin-bottom:8px; letter-spacing:.03em; }
.process-step p{ font-size:13.5px; }
@media (max-width:900px){ .process-strip{ grid-template-columns:1fr 1fr;} .process-step{ border-bottom:1px solid var(--panel-line);} }
@media (max-width:600px){ .process-strip{ grid-template-columns:1fr;} }

/* =========================== TESTIMONIALS =========================== */
.testi-card{ background:var(--paper-panel); border:1px solid var(--line); padding:30px; position:relative; }
.testi-card .quote-mark{ font-family:var(--font-display); font-size:52px; color:var(--orange); line-height:1; opacity:.4; }
.testi-card p{ margin:10px 0 18px; font-size:14.5px; color:var(--ink); }
.testi-who{ display:flex; align-items:center; gap:12px; }
.testi-avatar{ width:42px; height:42px; border-radius:50%; background:var(--graphite); color:var(--orange); display:flex; align-items:center; justify-content:center; font-family:var(--font-mono); font-weight:600; }
.testi-name{ font-family:var(--font-mono); font-size:13px; text-transform:uppercase; letter-spacing:.05em; }
.testi-role{ font-size:12px; color:var(--ink-soft); }

/* =========================== BLOG =========================== */
.blog-card{ background:var(--paper-panel); border:1px solid var(--line); }
.blog-thumb{ height:170px; position:relative; overflow:hidden; }
.blog-body{ padding:22px 24px 26px; }
.blog-date{ font-family:var(--font-mono); font-size:11px; color:var(--orange); letter-spacing:.08em; text-transform:uppercase; margin-bottom:10px; display:block; }
.blog-card h3{ font-size:17px; margin-bottom:10px; }
.blog-card p{ font-size:14px; }

/* =========================== CTA BAND =========================== */
.cta-band{ background:var(--orange); padding:64px 0; }
.cta-band .container{ display:flex; align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap; }
.cta-band h2{ color:#fff; margin:0; max-width:560px; }
.cta-band p{ color:rgba(255,255,255,.85); }

/* =========================== FOOTER =========================== */
.site-footer{ background:var(--graphite); color:var(--steel); padding-top:70px; }
.footer-top{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:40px; padding-bottom:50px; border-bottom:1px solid var(--panel-line); }
.footer-top h4{ color:var(--paper); font-size:13px; letter-spacing:.08em; margin-bottom:18px; }
.footer-top ul li{ margin-bottom:10px; }
.footer-top a{ color:var(--steel); font-size:14px; }
.footer-top a:hover{ color:var(--orange); }
.footer-brand p{ font-size:14px; margin:16px 0 20px; max-width:32ch; }
.footer-social{ display:flex; gap:10px; }
.footer-social a{ width:34px; height:34px; border:1px solid var(--panel-line); display:flex; align-items:center; justify-content:center; border-radius:2px; font-family:var(--font-mono); font-size:12px; }
.footer-social a:hover{ border-color:var(--orange); color:var(--orange); }
.footer-bottom{ display:flex; justify-content:space-between; padding:22px 0; font-size:12.5px; flex-wrap:wrap; gap:8px; }
.footer-bottom a{ color:var(--steel); }
@media (max-width:900px){ .footer-top{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .footer-top{ grid-template-columns:1fr; } }

/* =========================== PAGE HEADER (inner pages) =========================== */
.page-head{ padding:60px 0 54px; position:relative; }
.page-head .container{ position:relative; z-index:2; }
.breadcrumb{ font-family:var(--font-mono); font-size:12px; letter-spacing:.06em; text-transform:uppercase; color:var(--steel); margin-bottom:14px; }
.breadcrumb a{ color:var(--steel); } .breadcrumb a:hover{ color:var(--orange); }
.breadcrumb .sep{ margin:0 8px; color:var(--panel-line); }
.page-head h1{ margin:0; }

/* =========================== SPEC TABLE =========================== */
.spec-table{ width:100%; border-collapse:collapse; font-family:var(--font-mono); font-size:13.5px; }
.spec-table th,.spec-table td{ text-align:left; padding:12px 16px; border-bottom:1px solid var(--line); }
.spec-table th{ text-transform:uppercase; letter-spacing:.06em; font-size:11px; color:var(--ink-soft); font-weight:600; }

/* =========================== CONTACT =========================== */
.contact-grid{ display:grid; grid-template-columns:1fr 1.2fr; gap:50px; }
@media (max-width:900px){ .contact-grid{ grid-template-columns:1fr; } }
.contact-info-item{ display:flex; gap:16px; padding:18px 0; border-bottom:1px solid var(--panel-line); }
.contact-info-item .icon{ color:var(--orange); width:26px; height:26px; flex:none; }
.contact-info-item h4{ font-size:12.5px; color:var(--steel); letter-spacing:.08em; margin-bottom:4px; }
.contact-info-item p, .contact-info-item a{ color:var(--paper); font-size:15px; }

.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.form-grid .full{ grid-column:1/-1; }
label{ display:block; font-family:var(--font-mono); font-size:11px; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-soft); margin-bottom:6px; }
input,textarea,select{
  width:100%; border:1px solid var(--line); background:var(--paper-panel); padding:13px 14px;
  font-family:var(--font-body); font-size:14.5px; color:var(--ink); border-radius:2px;
}
input:focus,textarea:focus,select:focus{ outline:2px solid var(--orange); outline-offset:1px; border-color:var(--orange); }
textarea{ resize:vertical; min-height:120px; }
.form-note{ font-size:12.5px; margin-top:10px; color:var(--ink-soft); }
.form-success{ background:#eef7ef; border:1px solid #bfe3c4; color:#2b6b34; padding:14px 16px; font-size:14px; margin-bottom:18px; border-radius:2px; }

.map-frame{ border:1px solid var(--line); height:100%; min-height:280px; }
.map-frame iframe{ width:100%; height:100%; min-height:280px; border:0; filter:grayscale(.3) contrast(1.05); }

/* =========================== GALLERY =========================== */
.gallery-item{ position:relative; border:1px solid var(--line); background:var(--paper-panel); aspect-ratio:4/3; overflow:hidden; }
.gallery-item svg{ width:100%; height:100%; }
.gallery-cap{ position:absolute; left:0; right:0; bottom:0; padding:12px 14px; background:linear-gradient(0deg,rgba(20,23,26,.88),transparent); }
.gallery-cap span{ color:#fff; font-family:var(--font-mono); font-size:11.5px; letter-spacing:.06em; text-transform:uppercase; }

/* utility */
.mt-0{margin-top:0;} .text-center{text-align:center;margin-left:auto;margin-right:auto;}
.tag-row{ display:flex; gap:10px; flex-wrap:wrap; margin-top:22px; }
.tag{ font-family:var(--font-mono); font-size:11.5px; letter-spacing:.05em; text-transform:uppercase; border:1px solid var(--line); padding:7px 12px; color:var(--ink-soft); }