/* =========================================================
   ELS PERFORMANCE MAIN STYLESHEET
   ========================================================= */

/* 1. CUSTOM PROPERTIES / TOKENS */
:root {
  --els-bg:         #050505;
  --els-bg-alt:     #0f1012;
  --els-surface:    #15171a;
  --els-surface-hl: #1d2024;
  --els-border:     #2a2d33;

  --els-primary:    #e60000;
  --els-primary-hover:#ff1a1a;
  --els-secondary:  #4a90e2;
  --els-titanium:   #5b7a99;
  --els-carbon:     #111;

  --els-text:       #e0e0e0;
  --els-text-dim:   #9ca3af;
  --els-white:      #ffffff;

  --font-heading:   'Bebas Neue', sans-serif;
  --font-body:      'Barlow', sans-serif;
  --font-condensed: 'Barlow Condensed', sans-serif;

  --radius-sm:      4px;
  --radius-md:      8px;
  --radius-lg:      16px;

  --shadow-main:    0 10px 30px rgba(0,0,0,0.5);
  --shadow-red:     0 0 20px rgba(230,0,0,0.3);

  --max-width:      1320px;
  --transition:     all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. BASE STYLES */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  background: var(--els-bg);
  color: var(--els-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img, video { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; outline: none; background: transparent; }
input, select, textarea { font-family: inherit; }

/* 3. TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); color: var(--els-white); text-transform: uppercase; letter-spacing: 0.05em; line-height: 1.1; }
h1 { font-size: clamp(3rem, 6vw, 5rem); }
h2 { font-size: clamp(2.5rem, 4.5vw, 4rem); }
h3 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
h4 { font-size: 1.5rem; }

.text-red { color: var(--els-primary); }
.text-titanium { color: var(--els-titanium); }
.text-dim { color: var(--els-text-dim); }

/* 4. LAYOUT UTILITIES */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 6rem 0; }
.section-sm { padding: 3rem 0; }
.section-dark { background: var(--els-bg-alt); border-top: 1px solid var(--els-border); border-bottom: 1px solid var(--els-border); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }
.text-center { text-align: center; }

/* 5. BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.5rem;
  font-family: var(--font-condensed);
  font-weight: 700;
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  z-index: 1;
}
.btn::before {
  content: ''; position: absolute; inset: 0; z-index: -1;
  background: rgba(0,0,0,0.2); transform: skewX(-15deg) translateX(-150%);
  transition: transform 0.4s ease;
}
.btn:hover::before { transform: skewX(-15deg) translateX(0); }

.btn-primary { background: var(--els-primary); color: #fff; box-shadow: var(--shadow-red); }
.btn-primary:hover { background: var(--els-primary-hover); transform: translateY(-2px); box-shadow: 0 4px 25px rgba(230,0,0,0.5); }

.btn-outline { border: 2px solid var(--els-primary); color: var(--els-white); }
.btn-outline:hover { background: var(--els-primary); color: #fff; }

.btn-white { background: var(--els-white); color: var(--els-bg); }
.btn-white:hover { background: #e0e0e0; }
.btn-full { width: 100%; }

/* 6. HEADER */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(5,5,5,0.85); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition);
}
.site-header.scrolled { background: rgba(5,5,5,0.98); box-shadow: 0 4px 20px rgba(0,0,0,0.8); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; }

.site-logo { font-family: var(--font-heading); font-size: 2.2rem; letter-spacing: 0.05em; color: var(--els-white); }
.logo-highlight { color: var(--els-primary); }

.main-nav ul { display: flex; gap: 2rem; align-items: center; }
.main-nav a { font-family: var(--font-condensed); font-weight: 600; font-size: 1.1rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--els-text); position: relative; }
.main-nav a:hover, .main-nav a.current { color: var(--els-white); }
.main-nav a::after { content:''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--els-primary); transition: width 0.3s; }
.main-nav a:hover::after, .main-nav a.current::after { width: 100%; }

.mobile-menu-toggle { display: none; color: #fff; font-size: 1.5rem; }
.mobile-nav { display: none; position: fixed; inset: 0; top: 80px; background: var(--els-bg); z-index: 999; padding: 2rem; flex-direction: column; gap: 1rem; }
.mobile-nav.active { display: flex; }
.mobile-nav a { font-family: var(--font-heading); font-size: 2rem; color: #fff; border-bottom: 1px solid var(--els-border); padding-bottom: 0.5rem; }

/* 7. HERO SECTION */
.hero {
  height: 100vh; min-height: 600px;
  display: flex; align-items: center; position: relative;
  background: url('/assets/images/hero-bg.jpg') center/cover no-repeat;
  background-color: var(--els-bg);
}
/* If no image exists, fallback gradient */
.hero::before { content:''; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,5,5,0.9) 0%, rgba(5,5,5,0.4) 100%); z-index: 1; }
.hero-content { position: relative; z-index: 2; max-width: 800px; }
.hero-tagline { font-family: var(--font-condensed); font-weight: 700; font-size: 1.2rem; color: var(--els-primary); letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 1rem; display: block; }
.hero h1 { margin-bottom: 1.5rem; text-shadow: 0 4px 20px rgba(0,0,0,0.8); }
.hero p { font-size: 1.2rem; color: var(--els-text-dim); margin-bottom: 2.5rem; max-width: 600px; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* 8. SECTION HEADERS */
.section-header { margin-bottom: 4rem; text-align: center; }
.section-header .sub-title { font-family: var(--font-condensed); color: var(--els-primary); font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 0.5rem; display: block; }
.section-header h2 { position: relative; display: inline-block; }

/* 9. PRODUCT CARDS */
.category-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 2rem; }
.cat-card {
  background: var(--els-surface); border: 1px solid var(--els-border);
  border-radius: var(--radius-sm); overflow: hidden;
  transition: var(--transition); position: relative; display: flex; flex-direction: column;
}
.cat-card:hover { transform: translateY(-5px); border-color: var(--els-primary); box-shadow: 0 10px 30px rgba(230,0,0,0.15); }
.cat-badge { position: absolute; top: 1rem; right: 1rem; background: var(--els-primary); color: #fff; font-family: var(--font-condensed); font-weight: 700; font-size: 0.9rem; padding: 0.25rem 0.75rem; border-radius: 100px; z-index: 2; }
.cat-icon { font-size: 3rem; padding: 2rem 2rem 1rem; line-height: 1; }
.cat-body { padding: 0 2rem 2rem; flex: 1; display: flex; flex-direction: column; }
.cat-title { font-family: var(--font-condensed); font-size: 1.8rem; margin-bottom: 0.5rem; }
.cat-desc { color: var(--els-text-dim); margin-bottom: 1.5rem; flex: 1; font-size: 0.95rem; }
.cat-price { font-family: var(--font-heading); font-size: 1.5rem; color: var(--els-white); display: flex; justify-content: space-between; align-items: center; }
.cat-price span { color: var(--els-primary); font-size: 1.8rem; }

/* 10. COST CALCULATOR */
.calc-wrap { background: var(--els-surface); border: 1px solid var(--els-border); border-radius: var(--radius-md); padding: 3rem; box-shadow: var(--shadow-main); }
.calc-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 3rem; }
.calc-form .form-group { margin-bottom: 1.5rem; }
.form-label { display: block; font-family: var(--font-condensed); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.5rem; color: var(--els-text); }
.form-control { width: 100%; background: var(--els-bg); border: 1px solid var(--els-border); color: #fff; padding: 1rem; border-radius: var(--radius-sm); transition: var(--transition); }
.form-control:focus { border-color: var(--els-primary); outline: none; box-shadow: 0 0 0 2px rgba(230,0,0,0.2); }
.calc-summary { background: var(--els-bg-alt); padding: 2rem; border-radius: var(--radius-sm); border: 1px solid var(--els-border); }
.summary-item { display: flex; justify-content: space-between; margin-bottom: 1rem; color: var(--els-text-dim); border-bottom: 1px dashed rgba(255,255,255,0.1); padding-bottom: 0.5rem; }
.summary-total { margin-top: 2rem; display: flex; justify-content: space-between; align-items: center; border-top: 2px solid var(--els-primary); padding-top: 1rem; }
.summary-total-label { font-family: var(--font-heading); font-size: 2rem; }
.summary-total-price { font-family: var(--font-heading); font-size: 3rem; color: var(--els-primary); }

/* 11. CUSTOM ORDER BANNER */
.custom-banner { background: linear-gradient(135deg, #1a0505 0%, #050505 100%); border: 1px solid var(--els-primary); padding: 4rem 2rem; border-radius: var(--radius-lg); text-align: center; position: relative; overflow: hidden; }
.custom-banner::before { content:'⚙️'; position: absolute; font-size: 20rem; opacity: 0.03; right: -5%; top: -20%; }
.custom-banner h2 { margin-bottom: 1rem; }

/* 12. BRANDS LOGOS */
.brands-marquee { display: flex; gap: 3rem; overflow: hidden; padding: 2rem 0; opacity: 0.6; }
.brand-item { font-family: var(--font-heading); font-size: 2.5rem; color: var(--els-text-dim); white-space: nowrap; }

/* 13. MATERIAL CARDS */
.material-card { background: var(--els-surface); padding: 2rem; border-radius: var(--radius-sm); border: 1px solid var(--els-border); transition: var(--transition); }
.material-card:hover { border-color: var(--els-titanium); }
.mat-name { font-family: var(--font-condensed); font-size: 1.8rem; color: var(--els-white); margin-bottom: 0.5rem; display: flex; justify-content: space-between; }
.mat-code { color: var(--els-primary); font-size: 1.2rem; }

/* 14. FOOTER */
.site-footer { background: #000; border-top: 2px solid var(--els-primary); padding-top: 4rem; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 4rem; }
.fw-title { font-family: var(--font-condensed); font-size: 1.4rem; margin-bottom: 1.5rem; color: var(--els-white); letter-spacing: 0.05em; }
.footer-links li { margin-bottom: 0.8rem; }
.footer-links a { color: var(--els-text-dim); font-size: 0.95rem; }
.footer-links a:hover { color: var(--els-primary); padding-left: 5px; }
.footer-bottom { border-top: 1px solid var(--els-border); padding: 1.5rem 0; text-align: center; color: var(--els-text-dim); font-size: 0.9rem; }

/* 15. RESPONSIVE */
@media (max-width: 992px) {
  .main-nav { display: none; }
  .mobile-menu-toggle { display: block; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .calc-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 3.5rem; }
  h2 { font-size: 2.5rem; }
  .section { padding: 4rem 0; }
  .hero { min-height: 500px; text-align: center; }
  .hero-actions { justify-content: center; }
}

/* 16. PAGE HEADER */
.page-header { padding: 8rem 0 4rem; background: var(--els-bg-alt); border-bottom: 1px solid var(--els-border); text-align: center; }
.page-header h1 { margin-bottom: 1rem; }
.breadcrumbs { font-family: var(--font-condensed); letter-spacing: 0.05em; color: var(--els-text-dim); text-transform: uppercase; }
.bc-sep { margin: 0 0.5rem; color: var(--els-primary); }