/* ========================================================
   THE WEMBLEY ROOFING INFRASTRUCTURE STYLE CORE
   ======================================================== */

:root {
    /* Industrial Engineering Palette */
    --bg-dark: #0F1115;              /* Deep Slate Charcoal / Carbon */
    --bg-light: #F8FAFC;             /* Technical Clean Ice White */
    --surface-card: #1E222B;          /* Elevated Carbon Surface */
    --border-clean: rgba(255, 255, 255, 0.08);
    
    --accent-safety: #F59E0B;        /* High-Visibility Structural Amber */
    --text-pure: #FFFFFF;
    --text-muted: #94A3B8;           /* Clean Engineering Silver Gray */

    /* High-Performance Industrial Typography */
    --font-header: 'Space Grotesk', sans-serif;  /* Geometric & precise */
    --font-body: 'Plus Jakarta Sans', sans-serif; /* Clean technical data */

    /* UI Motion Curves */
    --ease-industrial: cubic-bezier(0.2, 0.8, 0.2, 1);
    --t-fast: 200ms;
    --t-normal: 500ms;
}

/* ========================================================
   BASE CANVAS CONFIGURATIONS
   ======================================================== */
html, body {
    margin: 0; padding: 0; width: 100%;
    background-color: var(--bg-dark);
    color: var(--text-pure);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container { width: 90%; max-width: 1400px; margin: 0 auto; }

/* ========================================================
   INITIAL SITE CURTAIN LOADER
   ======================================================== */
.load-curtain {
    position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
    background-color: #0B0C0E; z-index: 10000; pointer-events: none;
    display: flex; align-items: center; justify-content: center;
    transform-origin: top; transform: scaleY(1);
    transition: transform 800ms var(--send-industrial);
}
.load-curtain.is-loaded { transform: scaleY(0); }
.curtain-text { font-family: var(--font-header); font-size: 2.5rem; font-weight: 700; color: var(--accent-safety); letter-spacing: -1px; }

/* ========================================================
   HARDWARE SCROLL REVEALS
   ======================================================== */
.reveal {
    opacity: 0; transform: translateY(30px);
    will-change: transform, opacity;
    transition: opacity 800ms var(--ease-industrial), transform 800ms var(--ease-industrial);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 100ms; }
.delay-2 { transition-delay: 200ms; }

/* ========================================================
   FIXED TECHNICAL HEADER
   ======================================================== */
.site-header {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 999;
    border-bottom: 1px solid var(--border-clean);
    background: rgba(15, 17, 21, 0.85);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    padding: 1.5rem 0; transition: padding var(--t-fast) ease;
}
.site-header.scrolled { padding: 1rem 0; background: #0F1115; }

.header-grid { display: flex; justify-content: space-between; align-items: center; }
.brand-anchor { text-decoration: none; display: flex; align-items: center; gap: 0.75rem; }
.brand-mark { background: var(--accent-safety); width: 12px; height: 12px; transform: rotate(45deg); }
.brand-text { font-family: var(--font-header); font-size: 1.5rem; font-weight: 700; color: var(--text-pure); letter-spacing: -0.5px; }
.brand-text span { color: var(--accent-safety); }

.navigation-links { display: flex; gap: 3rem; }
.navigation-links a {
    text-decoration: none; color: var(--text-muted); font-size: 0.9rem; font-weight: 500;
    letter-spacing: 0.5px; transition: color var(--t-fast) ease; position: relative;
}
.navigation-links a:hover, .navigation-links a.active { color: var(--text-pure); }
.navigation-links a::after {
    content: ''; position: absolute; bottom: -6px; left: 0; width: 0; height: 2px;
    background: var(--accent-safety); transition: width var(--t-fast) ease;
}
.navigation-links a:hover::after, .navigation-links a.active::after { width: 100%; }

/* ========================================================
   HIGH-CONTRAST DYNAMIC HOVER INTERFACE (FIXED HOVER LEGIBILITY)
   ======================================================== */
.btn-action {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 1rem 2.2rem; font-family: var(--font-header); font-size: 0.9rem;
    font-weight: 600; letter-spacing: 0.5px; text-decoration: none;
    border: 2px solid transparent; position: relative; overflow: hidden; z-index: 1;
    transition: border-color var(--t-fast) ease, transform var(--t-fast) ease;
}
.btn-action span { position: relative; z-index: 3; transition: color var(--t-fast) ease; }
.btn-action::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 2; transform: scaleY(0); transform-origin: bottom center;
    transition: transform var(--t-normal) var(--ease-industrial);
}

/* Safety Filled Variant: Flips to hyper-contrast crisp white on absolute dark background when hovered */
.btn-safety { background: var(--accent-safety); border-color: var(--accent-safety); }
.btn-safety span { color: #000000; }
.btn-safety::before { background: #FFFFFF; }
.btn-safety:hover border-color: #FFFFFF;
.btn-safety:hover span { color: #000000; font-weight: 700; }
.btn-safety:hover::before { transform: scaleY(1); transform-origin: top center; }

/* Outline Structural Variant: Fills completely white with dark text on hover */
.btn-structural { border-color: rgba(255, 255, 255, 0.2); }
.btn-structural span { color: var(--text-pure); }
.btn-structural::before { background: var(--text-pure); }
.btn-structural:hover span { color: #0F1115; font-weight: 700; }
.btn-structural:hover::before { transform: scaleY(1); transform-origin: top center; }

/* ========================================================
   INDUSTRIAL HERO PLATFORM
   ======================================================== */
.hero-viewport {
    height: 100vh; display: flex; align-items: center; position: relative;
    overflow: hidden; background: #07080A;
}
.hero-canvas-wrapper { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; }
.hero-canvas-wrapper img { width: 100%; height: 100%; object-fit: cover; opacity: 0.35; mix-blend-mode: luminosity; }
.hero-gradient-shield {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(90deg, #0F1115 20%, rgba(15,17,21,0.6) 60%, rgba(15,17,21,0.1) 100%);
}

.hero-layout-box { position: relative; z-index: 5; max-width: 850px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 0.5rem; background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3); padding: 0.5rem 1rem; border-radius: 4px;
    font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px; color: var(--accent-safety);
    font-weight: 600; margin-bottom: 2rem;
}
.hero-layout-box h1 { font-family: var(--font-header); font-size: 4.8rem; font-weight: 700; line-height: 1.05; margin: 0 0 1.5rem; letter-spacing: -2px; }
.hero-layout-box p { font-size: 1.15rem; color: var(--text-muted); line-height: 1.7; margin: 0 0 3.5rem; max-width: 650px; }
.hero-button-row { display: flex; gap: 1.5rem; }

/* ========================================================
   SYSTEMS SUMMARY METRICS & SPECIFICATIONS
   ======================================================== */
.spec-section { padding: 8rem 0; background: #0B0C0E; border-bottom: 1px solid var(--border-clean); }
.grid-three-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
.spec-card { background: var(--surface-card); border: 1px solid var(--border-clean); padding: 3rem; position: relative; transition: border-color var(--t-fast) ease; }
.spec-card h3 { font-family: var(--font-header); font-size: 1.8rem; margin: 0 0 1rem; color: var(--text-pure); }
.spec-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; margin: 0; }
.spec-card:hover { border-color: var(--accent-safety); }

/* ========================================================
   SUBPAGE ARCHITECTURE & STRUCTURAL CARD OVERLAYS
   ======================================================== */
.subpage-banner { padding: 12rem 0 6rem; background: linear-gradient(180deg, #07080A 0%, #0F1115 100%); border-bottom: 1px solid var(--border-clean); }
.subpage-banner h2 { font-family: var(--font-header); font-size: 3.5rem; font-weight: 700; margin: 0 0 1rem; letter-spacing: -1px; }
.subpage-banner p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0; }

.structural-systems-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(400px, 1fr)); gap: 2.5rem; padding: 6rem 0; }

/* SYSTEM CARD HOVER LOGIC - COMPLETE FLIP TO ABSOLUTE HIGH CONTRAST */
.system-card {
    background: var(--surface-card); border: 1px solid var(--border-clean);
    position: relative; overflow: hidden; height: 480px; display: flex; flex-direction: column;
    justify-content: flex-end; padding: 3rem; box-sizing: border-box; text-decoration: none;
    transition: transform var(--t-normal) var(--ease-industrial), border-color var(--t-fast) ease;
}
.system-card-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; transition: transform var(--t-normal) var(--ease-industrial); }
.system-card-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.25; mix-blend-mode: luminosity; }
.system-card-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 2; background: linear-gradient(to top, #0F1115 30%, rgba(15,17,21,0) 80%); transition: background var(--t-fast) ease; }

.system-card-contents { position: relative; z-index: 3; transition: color var(--t-fast) ease; }
.system-card-contents h4 { font-family: var(--font-header); font-size: 2rem; margin: 0 0 0.75rem; color: var(--text-pure); transition: color var(--t-fast) ease; }
.system-card-contents p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; margin: 0; transition: color var(--t-fast) ease; }

/* THE HOVER INTERVERSION STATE (Text turns pitch black against absolute high-contrast safety yellow background) */
.system-card:hover { border-color: var(--accent-safety); transform: translateY(-4px); }
.system-card:hover .system-card-overlay { background: var(--accent-safety); opacity: 0.96; }
.system-card:hover .system-card-bg { transform: scale(1.05); }
.system-card:hover .system-card-contents h4 { color: #000000; font-weight: 700; }
.system-card:hover .system-card-contents p { color: #1E222B; font-weight: 500; }

/* ========================================================
   ESTIMATOR COMPONENT SLOT
   ======================================================== */
.interactive-calc-slot { background: #13161C; border: 2px dashed rgba(245, 158, 11, 0.2); padding: 3rem; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; }
.calc-icon { font-size: 2.5rem; margin-bottom: 1rem; color: var(--accent-safety); }
.interactive-calc-slot h4 { font-family: var(--font-header); font-size: 1.8rem; margin: 0 0 0.5rem; }
.interactive-calc-slot p { color: var(--text-muted); font-size: 0.9rem; max-width: 280px; margin: 0 0 1.5rem; }

/* ========================================================
   ESTIMATION CONTROL PORTAL FORM
   ======================================================== */
.portal-split-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 5rem; padding: 6rem 0; }
.estimation-form { display: flex; flex-direction: column; gap: 2.5rem; }
.form-field-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-field-group label { font-family: var(--font-header); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); }
.form-field-group input, .form-field-group select, .form-field-group textarea {
    background: var(--surface-card); border: 1px solid var(--border-clean); padding: 1.2rem;
    color: var(--text-pure); font-family: var(--font-body); font-size: 1rem; border-radius: 4px;
    transition: border-color var(--t-fast) ease, outline var(--t-fast) ease;
}
.form-field-group input:focus, .form-field-group select:focus, .form-field-group textarea:focus { outline: none; border-color: var(--accent-safety); }

.side-info-panel { background: var(--surface-card); border: 1px solid var(--border-clean); padding: 3.5rem; border-radius: 4px; height: fit-content; }
.side-info-panel h5 { font-family: var(--font-header); font-size: 1.4rem; margin: 0 0 1.5rem; color: var(--text-pure); }
.contact-meta-row { display: flex; flex-direction: column; gap: 1.5rem; margin-bottom: 2.5rem; }
.meta-block span { display: block; font-size: 0.75rem; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.5px; margin-bottom: 0.25rem; }
.meta-block p { margin: 0; font-size: 1.1rem; font-weight: 600; color: var(--text-pure); }
.meta-block a { color: var(--text-pure); text-decoration: none; }
.meta-block a:hover { color: var(--accent-safety); }

/* ========================================================
   INDUSTRIAL FOOTER ELEMENT
   ======================================================== */
.footer-wrapper { background: #090A0C; border-top: 1px solid var(--border-clean); padding: 6rem 0 3rem; }
.footer-layout { display: grid; grid-template-columns: 2fr repeat(2, 1fr); gap: 4rem; margin-bottom: 4rem; }
.footer-column p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; max-width: 400px; margin-top: 1rem; }
.footer-column h6 { font-family: var(--font-header); font-size: 1rem; margin: 0 0 1.5rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-pure); }
.footer-column ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.75rem; }
.footer-column ul li a { color: var(--text-muted); text-decoration: none; font-size: 0.95rem; transition: color var(--t-fast) ease; }
.footer-column ul li a:hover { color: var(--text-pure); }

.footer-bottom-bar { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border-clean); padding-top: 2rem; font-size: 0.85rem; color: var(--text-muted); }

/* ========================================================
   RESPONSIVE LAYOUT ENGINE
   ======================================================== */
@media (max-width: 1024px) {
    .hero-layout-box h1 { font-size: 3.5rem; }
    .grid-three-col, .portal-split-grid { grid-template-columns: 1fr; gap: 3rem; }
    .footer-layout { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .hero-layout-box h1 { font-size: 2.5rem; }
    .navigation-links { display: none; }
    .structural-systems-grid { grid-template-columns: 1fr; }
}