/* 
========================================================================
   SKETCH CONSTRUCTION - MODERN INDUSTRIAL STYLING
   Author: Antigravity AI
   Color Palette: Deep Charcoal Gray, Stark White, Structural Amber/Gold
========================================================================
*/

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
    --bg-dark: #121212;
    --bg-surface: #1A1A1A;
    --bg-surface-elevated: #262626;
    
    --primary: #FFB800; /* Safety Amber / Structural Gold */
    --primary-hover: #E0A200;
    --primary-rgb: 255, 184, 0;
    
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0A0;
    --text-muted: #666666;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(255, 184, 0, 0.2);
    
    --font-heading: 'Outfit', sans-serif;
    --font-technical: 'Space Grotesk', sans-serif;
    
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    --container-max-width: 1200px;
    --header-height: 80px;
}

/* --- Base Resets & Typography --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-heading);
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

p {
    font-family: var(--font-heading);
    font-weight: 400;
    color: var(--text-secondary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    background: none;
    border: none;
    outline: none;
    color: inherit;
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Layout Components --- */

/* Announcement Bar */
.announcement-bar {
    background-color: #0d0d0d;
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
    font-family: var(--font-technical);
    color: var(--text-secondary);
    padding: 8px 0;
}

.bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.bar-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.bar-item .icon {
    width: 14px;
    height: 14px;
    fill: var(--primary);
}

.highlight-badge {
    background-color: rgba(255, 184, 0, 0.1);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.pulse-dot {
    width: 6px;
    height: 6px;
    background-color: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(255, 184, 0, 0.7);
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(255, 184, 0, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(255, 184, 0, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(255, 184, 0, 0);
    }
}

/* Header & Navigation */
.main-header {
    height: var(--header-height);
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    transition: var(--transition-smooth);
}

.main-header.scrolled {
    height: 70px;
    background-color: rgba(13, 13, 13, 0.95);
    border-bottom-color: rgba(255, 184, 0, 0.15);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-symbol {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-symbol.small-logo {
    width: 44px;
    height: 44px;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: invert(0.9) contrast(1.1) brightness(1.2);
    transition: var(--transition-fast);
}

.logo:hover .logo-img {
    transform: scale(1.05);
    filter: invert(0.9) contrast(1.1) brightness(1.4) drop-shadow(0 0 8px rgba(255, 184, 0, 0.3));
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    line-height: 1;
}

.logo-subtitle {
    font-family: var(--font-technical);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--primary);
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Custom Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-technical);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background-color: var(--primary);
    color: #000000;
    box-shadow: 0 4px 15px rgba(255, 184, 0, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 184, 0, 0.35);
}

.btn-hero-primary {
    background-color: #F59E0B;
    color: #FFFFFF;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.2);
    border: 1px solid #F59E0B;
}

.btn-hero-primary:hover {
    background-color: #D97706;
    border-color: #D97706;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
}

.btn-hero-secondary {
    background-color: transparent;
    border: 1px solid #1E293B;
    color: var(--text-primary);
}

.btn-hero-secondary:hover {
    background-color: rgba(30, 41, 59, 0.1);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary);
    background-color: rgba(255, 184, 0, 0.05);
    color: var(--primary);
}

.btn-text {
    color: var(--text-primary);
    padding: 12px 0;
}

.btn-text .arrow-icon {
    width: 16px;
    height: 16px;
    fill: var(--primary);
    transition: var(--transition-fast);
}

.btn-text:hover {
    color: var(--primary);
}

.btn-text:hover .arrow-icon {
    transform: translateX(6px);
}

.btn-block {
    width: 100%;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-toggle .bar {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-fast);
}

/* --- Hero Section & Interactive Slider --- */
.hero-section {
    position: relative;
    padding: 100px 0 120px;
    min-height: calc(100vh - var(--header-height) - 40px);
    display: flex;
    align-items: center;
    background-color: #0F0F0F;
    overflow: hidden;
}

.blueprint-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 184, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 184, 0, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 1;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.tagline-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(255, 184, 0, 0.08);
    border: 1px solid var(--border-accent);
    color: var(--primary);
    font-family: var(--font-technical);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 6px 14px;
    border-radius: 4px;
    margin-bottom: 24px;
}

.badge-icon {
    width: 14px;
    height: 14px;
    fill: var(--primary);
}

.hero-content h1 {
    font-size: clamp(48px, 6vw, 76px);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    text-transform: uppercase;
}

.accent-text {
    color: var(--primary);
    position: relative;
}

.hero-lead {
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

/* Blueprint-to-Reality Interactive Slider */
.hero-visual {
    width: 100%;
}

.split-slider-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    border: 1px solid var(--border-color);
    user-select: none;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blueprint-slide {
    z-index: 5;
    background-color: var(--bg-dark);
}

.reality-slide {
    z-index: 10;
    width: 50%; /* JS updates this */
    overflow: hidden;
}

.reality-slide img {
    /* Maintain full width image offset */
    width: 100%;
    min-width: 100%;
    max-width: none;
    height: 100%;
}

.slide-label {
    position: absolute;
    bottom: 20px;
    font-family: var(--font-technical);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.1em;
    background-color: rgba(0,0,0,0.7);
    padding: 4px 10px;
    border-radius: 4px;
    z-index: 15;
}

.blueprint-label {
    left: 20px;
    color: var(--primary);
    border-left: 2px solid var(--primary);
}

.reality-label {
    right: 20px;
    color: #FFFFFF;
    border-right: 2px solid #FFFFFF;
    /* Label stays on right inside container, hide when cropped */
    white-space: nowrap;
}

.slider-handle {
    position: absolute;
    top: 0;
    left: 50%; /* JS updates this */
    width: 40px;
    height: 100%;
    transform: translateX(-50%);
    z-index: 20;
    cursor: ew-resize;
    display: flex;
    align-items: center;
    justify-content: center;
}

.handle-line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--primary);
    box-shadow: 0 0 10px var(--primary);
}

.handle-button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    border: 2px solid #121212;
    transition: transform 0.15s ease;
}

.slider-handle:hover .handle-button {
    transform: scale(1.1);
}

.handle-arrow {
    width: 20px;
    height: 20px;
    fill: #121212;
}

/* --- Compliance Banner --- */
.compliance-section {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 40px 0;
}

.compliance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.compliance-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.comp-icon-box {
    background-color: rgba(255, 184, 0, 0.08);
    border: 1px solid var(--border-accent);
    padding: 10px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.comp-icon {
    width: 22px;
    height: 22px;
    fill: var(--primary);
}

.comp-info h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.comp-info p {
    font-size: 14px;
    line-height: 1.4;
    color: var(--text-secondary);
}

/* --- About Us & Pillars Section --- */
.about-section {
    padding: 120px 0;
}

.text-center {
    text-align: center;
}

.section-title {
    font-size: clamp(32px, 4vw, 42px);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-line {
    width: 60px;
    height: 3px;
    background-color: var(--primary);
    margin: 0 auto 24px;
}

.section-line.left-aligned {
    margin: 0 0 24px 0;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.about-content-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 64px;
    align-items: center;
    margin-top: 64px;
}

.about-image-wrapper {
    position: relative;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.about-image {
    width: 100%;
    aspect-ratio: 1.1;
    object-fit: cover;
    filter: grayscale(1) brightness(0.9);
    transition: var(--transition-smooth);
}

.about-image-wrapper:hover .about-image {
    filter: grayscale(0.2) brightness(0.95);
}

.about-experience-badge {
    position: absolute;
    bottom: -1px;
    right: -1px;
    background-color: var(--primary);
    color: #121212;
    padding: 24px 32px;
    border-top-left-radius: var(--border-radius-md);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.exp-number {
    font-family: var(--font-technical);
    font-size: 40px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 4px;
}

.exp-text {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.about-pillars {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.pillar-card {
    display: flex;
    gap: 24px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 28px;
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
}

.pillar-card:hover {
    border-color: var(--primary);
    transform: translateX(10px);
    box-shadow: -4px 4px 15px rgba(255,184,0,0.05);
}

.pillar-number {
    font-family: var(--font-technical);
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.pillar-body h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.pillar-body p {
    font-size: 15px;
    line-height: 1.5;
}

/* --- Services Section --- */
.services-section {
    background-color: var(--bg-surface);
    padding: 120px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
    margin-top: 64px;
}

.service-card {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 40px 32px;
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
}

.service-card:hover {
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.service-icon {
    width: 48px;
    height: 48px;
    background-color: rgba(255,184,0,0.08);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    border: 1px solid var(--border-accent);
}

.service-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--primary);
}

.service-card h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.service-card p {
    font-size: 15px;
    margin-bottom: 24px;
}

.service-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-specs span {
    font-family: var(--font-technical);
    font-size: 11px;
    font-weight: 500;
    background-color: rgba(255,255,255,0.05);
    padding: 4px 8px;
    border-radius: 4px;
    color: var(--text-secondary);
}

/* --- Portfolio Grid Section --- */
.portfolio-section {
    padding: 120px 0;
}

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 40px 0 20px;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-technical);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 10px 20px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--primary);
    color: #121212;
    border-color: var(--primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 40px;
}

.portfolio-item {
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    aspect-ratio: 4/3;
    position: relative;
    transition: var(--transition-smooth);
}

/* Hide animations for filtering */
.portfolio-item.hidden {
    display: none;
}

.portfolio-image-box {
    width: 100%;
    height: 100%;
    position: relative;
}

.portfolio-image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(0.5);
    transition: var(--transition-smooth);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(13,13,13,0.95) 20%, rgba(13,13,13,0.3) 100%);
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    opacity: 0.9;
    transition: var(--transition-smooth);
}

.portfolio-item:hover img {
    transform: scale(1.05);
    filter: grayscale(0);
}

.portfolio-item:hover .portfolio-overlay {
    background: linear-gradient(to top, rgba(13,13,13,0.98) 35%, rgba(13,13,13,0.5) 100%);
}

.project-tag {
    font-family: var(--font-technical);
    font-size: 11px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.portfolio-overlay h4 {
    font-size: 24px;
    margin-bottom: 8px;
}

.project-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-smooth);
}

.portfolio-item:hover .project-desc {
    opacity: 1;
    transform: translateY(0);
}

.project-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-technical);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #FFFFFF;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-smooth);
    transition-delay: 0.05s;
}

.project-more svg {
    width: 16px;
    height: 16px;
    fill: var(--primary);
}

.portfolio-item:hover .project-more {
    opacity: 1;
    transform: translateY(0);
}

/* --- Tender / Inquiry Section --- */
.tender-section {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 120px 0;
}

.tender-container {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 64px;
    align-items: start;
}

.tender-info h2 {
    font-size: clamp(32px, 4vw, 42px);
    text-transform: uppercase;
    margin-bottom: 24px;
}

.tender-info p {
    font-size: 16px;
    margin-bottom: 40px;
}

.tender-contact-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    width: 24px;
    height: 24px;
    fill: var(--primary);
}

.contact-card h5 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.contact-card p {
    font-family: var(--font-technical);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* Tender Inquiry Form */
.tender-form-box {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 48px;
    border-radius: var(--border-radius-md);
    position: relative;
    overflow: hidden;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input, 
.form-group select, 
.form-group textarea {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 14px 18px;
    border-radius: var(--border-radius-sm);
    font-size: 15px;
    transition: var(--transition-fast);
    width: 100%;
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(255, 184, 0, 0.1);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23FFB800'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 18px center;
    background-size: 18px;
}

.custom-file-label {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.custom-file-label:hover {
    border-color: var(--primary);
    background-color: rgba(255,184,0,0.02);
}

.custom-file-label:hover .file-icon {
    fill: var(--primary);
}

.file-icon {
    width: 32px;
    height: 32px;
    fill: var(--text-secondary);
    transition: var(--transition-fast);
}

.custom-file-label span {
    font-size: 13px;
    color: var(--text-secondary);
}

.hidden-input {
    display: none;
}

.submit-arrow {
    width: 16px;
    height: 16px;
    fill: #121212;
    transition: var(--transition-fast);
}

.btn-primary:hover .submit-arrow {
    transform: translateX(4px);
}

/* Success Overlay */
.form-success-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #121212;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    z-index: 30;
    padding: 48px;
    text-align: center;
}

.form-success-overlay.active {
    opacity: 1;
    visibility: visible;
}

.success-content {
    transform: translateY(20px);
    transition: var(--transition-smooth);
    transition-delay: 0.1s;
    max-width: 380px;
}

.form-success-overlay.active .success-content {
    transform: translateY(0);
}

.success-checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
}

.success-checkmark svg {
    width: 100%;
    height: 100%;
}

.success-checkmark circle {
    stroke: var(--primary);
    stroke-width: 3;
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    animation: drawCircle 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.success-checkmark path {
    stroke: var(--primary);
    stroke-width: 3;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    animation: drawCheck 0.4s cubic-bezier(0.65, 0, 0.45, 1) 0.5s forwards;
}

@keyframes drawCircle {
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes drawCheck {
    100% {
        stroke-dashoffset: 0;
    }
}

.success-content h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.success-content p {
    font-size: 15px;
    margin-bottom: 32px;
}

/* --- Footer --- */
.site-footer {
    background-color: #0B0B0B;
    border-top: 1px solid var(--border-color);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr 1fr;
    gap: 64px;
    margin-bottom: 64px;
}

.footer-desc {
    font-size: 14px;
    margin-top: 20px;
    margin-bottom: 24px;
    max-width: 380px;
}

.footer-certs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.cert-tag {
    font-family: var(--font-technical);
    font-size: 10px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    padding: 4px 8px;
    border-radius: 4px;
    color: var(--text-secondary);
}

.footer-links h4, .footer-contact h4 {
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 24px;
    color: var(--primary);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-contact p {
    font-size: 14px;
    margin-bottom: 12px;
}

.footer-contact strong {
    color: #FFFFFF;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    font-size: 12px;
    color: var(--text-muted);
}

.bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.licensing {
    font-family: var(--font-technical);
}

/* --- Responsive Media Queries --- */

@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }
    
    .tagline-badge {
        margin: 0 auto 24px;
    }
    
    .hero-lead {
        margin: 0 auto 40px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-visual {
        max-width: 580px;
        margin: 0 auto;
    }
    
    .about-content-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .about-image-wrapper {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .tender-container {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 48px;
    }
    
    .footer-about {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .main-header.scrolled {
        height: 60px;
    }
    
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #0F0F0F;
        border-bottom: 1px solid var(--border-color);
        padding: 24px;
        gap: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.5);
    }
    
    .nav-menu.mobile-active {
        display: flex;
    }
    
    .nav-btn {
        width: 100%;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .compliance-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .tender-form-box {
        padding: 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-about {
        grid-column: span 1;
    }
}

/* --- Core Expertise (About Grid Layout) --- */
.about-intro-col {
    display: flex;
    flex-direction: column;
}

.about-lead-text {
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.about-cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* Adjust pillar card for grid context */
.about-cards-grid .pillar-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
}

.about-cards-grid .pillar-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(255, 184, 0, 0.06);
}

/* --- Material Estimation Calculator --- */
.calculator-section {
    padding: 120px 0;
    background-color: var(--bg-dark);
}

.calculator-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 48px;
    border-radius: var(--border-radius-md);
    margin-top: 64px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.calc-inputs, .calc-outputs {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.calc-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.calc-group label {
    font-family: var(--font-technical);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.calc-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #2C2C2C;
    outline: none;
}

.calc-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 10px var(--primary);
}

.slider-marks {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-technical);
    font-size: 11px;
    color: var(--text-muted);
}

.floor-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.floor-btn {
    font-family: var(--font-technical);
    font-size: 13px;
    font-weight: 600;
    padding: 12px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
    background-color: var(--bg-dark);
    color: var(--text-secondary);
}

.floor-btn.active, .floor-btn:hover {
    background-color: var(--primary);
    color: #121212;
    border-color: var(--primary);
}

.calc-select {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 14px;
    border-radius: var(--border-radius-sm);
    font-size: 15px;
    color: #FFFFFF;
}

/* Outputs column */
.calc-outputs {
    background-color: rgba(255, 184, 0, 0.02);
    border: 1px dashed var(--border-accent);
    padding: 40px;
    border-radius: var(--border-radius-md);
}

.output-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 12px;
}

.output-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.out-label {
    font-family: var(--font-technical);
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.out-val {
    font-size: 32px;
    font-weight: 800;
    color: #FFFFFF;
}

.out-brand {
    font-size: 11px;
    color: var(--text-muted);
}

.font-highlight {
    grid-column: span 2;
    background-color: rgba(255, 184, 0, 0.05);
    border: 1px solid var(--border-accent);
    padding: 16px;
    border-radius: var(--border-radius-sm);
}

.highlight-val {
    font-size: 36px;
    color: var(--primary);
}

.calc-cta {
    margin-top: auto;
}

/* --- Project Workflow --- */
.workflow-section {
    padding: 120px 0;
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.workflow-timeline {
    position: relative;
    max-width: 800px;
    margin: 64px auto 0;
    padding-left: 48px;
}

.timeline-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 20px;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-step {
    position: relative;
    margin-bottom: 48px;
}

.timeline-step:last-child {
    margin-bottom: 0;
}

.step-marker {
    position: absolute;
    left: -48px;
    top: 4px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #121212;
    font-family: var(--font-technical);
    font-weight: 700;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 10px rgba(255, 184, 0, 0.3);
    z-index: 5;
}

.step-card {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 28px 32px;
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
}

.step-card:hover {
    border-color: var(--primary);
    transform: translateX(10px);
    box-shadow: -4px 4px 15px rgba(255, 184, 0, 0.05);
}

.step-card h4 {
    font-size: 18px;
    color: #FFFFFF;
    margin-bottom: 8px;
}

.step-card p {
    font-size: 14px;
    line-height: 1.5;
}

/* Responsiveness overrides for calculator */
@media (max-width: 1024px) {
    .calculator-box {
        grid-template-columns: 1fr;
        padding: 32px;
        gap: 32px;
    }
}

/* --- Social Icons Hover Effect --- */
.social-link-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.social-link-icon:hover svg {
    fill: var(--primary) !important;
    transform: scale(1.15);
}