:root {
    /* Theme Variables - Light Mode (Default) */
    --primary: #FFD700; /* Safety Yellow */
    --primary-dark: #e6c200;
    --secondary: #1a1a1a; /* Asphalt */
    --text-main: #1a1a1a;
    --text-muted: #666666;
    --bg-body: #ffffff;
    --bg-surface: #f4f4f4;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-glass: rgba(255, 255, 255, 0.3);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --font-heading: 'Oswald', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

[data-theme="dark"] {
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --bg-body: #121212;
    --bg-surface: #1e1e1e;
    --bg-glass: rgba(30, 30, 30, 0.7);
    --border-glass: rgba(255, 255, 255, 0.1);
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    text-transform: uppercase;
    font-weight: 700;
    line-height: 1.1;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Utilities */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    font-family: var(--font-heading);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    background-color: var(--primary);
    color: var(--secondary);
    border: none;
    clip-path: polygon(10% 0, 100% 0, 100% 70%, 90% 100%, 0 100%, 0 30%);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.2);
    transform: translateX(-100%);
    transition: transform 0.4s ease;
}

.btn:hover::before {
    transform: translateX(0);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 215, 0, 0.3);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary);
    color: var(--text-main);
    clip-path: none;
    border-radius: 0;
}

.btn-outline:hover {
    background-color: var(--primary);
    color: var(--secondary);
}

/* Glassmorphism Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    padding: 1rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--transition);
}

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--primary);
    transform: rotate(15deg);
}

/* Hero Section with Parallax */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 110%; /* For parallax */
    background-image: url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=2400&q=80');
    background-size: cover;
    background-position: center;
    z-index: -1;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 100%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    color: #ffffff;
}

.hero-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--primary);
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    line-height: 1;
}

.hero-desc {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
}

/* Stats Section (Glassmorphism) */
.stats-section {
    margin-top: -100px;
    position: relative;
    z-index: 2;
    padding-bottom: 4rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-glass);
    padding: 3rem;
    border-radius: 4px;
}

.stat-item {
    text-align: center;
    border-right: 1px solid var(--border-glass);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    color: var(--primary);
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

/* Services Grid (CSS Grid) */
.services-section {
    padding: 6rem 0;
    background-color: var(--bg-surface);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--primary);
    margin: 1rem auto 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--bg-body);
    padding: 3rem 2rem;
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.service-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.service-link {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.service-link i {
    transition: transform 0.3s ease;
}

.service-card:hover .service-link i {
    transform: translateX(5px);
}

/* Projects Gallery (Masonry-ish) */
.projects-section {
    padding: 6rem 0;
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.filter-btn {
    background: none;
    border: none;
    font-family: var(--font-heading);
    font-size: 1rem;
    text-transform: uppercase;
    color: var(--text-muted);
    cursor: pointer;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.filter-btn.active, .filter-btn:hover {
    color: var(--text-main);
    border-color: var(--primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.project-item {
    position: relative;
    height: 400px;
    overflow: hidden;
    cursor: pointer;
}

.project-item:nth-child(2) {
    grid-column: span 2;
}

.project-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2rem;
    opacity: 0;
    transition: var(--transition);
}

.project-item:hover img {
    transform: scale(1.1);
}

.project-item:hover .project-overlay {
    opacity: 1;
}

.project-info h3 {
    color: #fff;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    transform: translateY(20px);
    transition: transform 0.4s ease 0.1s;
}

.project-info p {
    color: var(--primary);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
    transform: translateY(20px);
    transition: transform 0.4s ease 0.2s;
}

.project-item:hover h3,
.project-item:hover p {
    transform: translateY(0);
}

/* Quote Calculator */
.quote-section {
    padding: 6rem 0;
    background-color: var(--secondary);
    color: #fff;
    position: relative;
    clip-path: polygon(0 10%, 100% 0, 100% 100%, 0 90%);
}

.quote-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.quote-form-container {
    background: #fff;
    padding: 3rem;
    border-radius: 4px;
    color: var(--text-main);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ddd;
    background: #f9f9f9;
    font-family: var(--font-body);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
}

.range-slider {
    width: 100%;
    margin: 1rem 0;
    -webkit-appearance: none;
    height: 4px;
    background: #ddd;
    outline: none;
}

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

.estimated-cost {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
    text-align: center;
}

.cost-display {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--primary-dark);
    display: block;
}

/* Footer */
footer {
    background-color: #111;
    color: #fff;
    padding: 6rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.footer-about p {
    color: #888;
    margin-top: 1rem;
}

.footer-col h4 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: #888;
}

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

.footer-bottom {
    border-top: 1px solid #222;
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #666;
    font-size: 0.9rem;
}

/* Animations */
[data-scroll] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-scroll].visible {
    opacity: 1;
    transform: translateY(0);
}

/* Mobile Responsive */
@media (max-width: 1024px) {
    .hero-title { font-size: 3.5rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .project-item:nth-child(2) { grid-column: auto; }
}

@media (max-width: 768px) {
    .nav-links { display: none; } /* Simplified for mobile demo */
    .hero { clip-path: none; height: auto; padding: 8rem 0 4rem; }
    .hero-title { font-size: 2.5rem; }
    .quote-section { clip-path: none; }
    .quote-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; padding: 2rem; }
    .stat-item { border-right: none; border-bottom: 1px solid var(--border-glass); padding-bottom: 1rem; margin-bottom: 1rem; }
    .stat-item:last-child { border-bottom: none; margin-bottom: 0; }
    .footer-grid { grid-template-columns: 1fr; }
}