/* 
  CSS Design System for Modern Modular Housing Website
  Style: Modern Minimalism / Professional / Architectural
*/

:root {
    /* Color Palette */
    --primary-color: #000000;
    --secondary-bg: #F5F5F5;
    --white: #FFFFFF;
    --text-main: #1A1A1A;
    --text-body: #4A4A4A;
    --text-muted: #999999;
    --accent-green: #00C853;
    --border-color: #E0E0E0;

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    --line-height-heading: 1.2;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* UI Details */
    --border-radius: 16px;
    --transition-fast: 0.2s ease;
    --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --container-width: 1280px;
}

/* --- Global Reset & Base Styles --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-main);
    color: var(--text-main);
    background-color: var(--white);
    line-height: var(--line-height-base);
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

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

/* --- Layout Components --- */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
}

.section-padding {
    padding: var(--spacing-lg) 0;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 100px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-slow);
    border: none;
    font-size: 0.95rem;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--secondary-bg);
    color: var(--text-main);
}

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

.btn-ghost {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

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

/* --- Header / Navigation --- */
.header {
    width: 100%;
    height: 80px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

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

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-body);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.lang-switch {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.lang-switch span.active {
    color: var(--primary-color);
}

/* --- Hero Section --- */
.hero {
    display: flex;
    align-items: center;
    min-height: 80vh;
    padding: var(--spacing-lg) 0;
}

.hero-content {
    flex: 1;
    padding-right: var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    margin-bottom: var(--spacing-sm);
}

.hero-title span {
    color: var(--text-muted);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-body);
    max-width: 480px;
    margin-bottom: var(--spacing-md);
}

.hero-image-wrapper {
    flex: 1;
    position: relative;
}

.hero-image {
    border-radius: var(--border-radius);
    width: 100%;
    height: 500px;
    object-fit: cover;
}

.status-card {
    position: absolute;
    bottom: 20px;
    left: -20px;
    background: var(--white);
    padding: 15px 20px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

/* --- Product Cards --- */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition-slow);
}

.card:hover {
    transform: translateY(-10px);
}

.card-img {
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--border-radius);
}

.card-info {
    padding: var(--spacing-sm) 0;
}

.card-tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.card-title {
    margin: 4px 0;
    font-size: 1.25rem;
}

/* --- Form Styles --- */
.contact-section {
    background: var(--primary-color);
    color: var(--white);
    border-radius: 24px;
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: #AAA;
}

.form-input {
    width: 100%;
    padding: 16px;
    background: #1A1A1A;
    border: 1px solid #333;
    border-radius: 8px;
    color: var(--white);
    outline: none;
    transition: var(--transition-fast);
}

.form-input:focus {
    border-color: var(--white);
}

/* --- Footer --- */
.footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid var(--secondary-bg);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-legal a {
    margin-left: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-body);
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mt-1 { margin-top: var(--spacing-sm); }
.bg-light { background-color: var(--secondary-bg); }

/* --- Animations --- */
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.4; }
    100% { opacity: 1; }
}

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

/* Tablet (1024px) */
@media (max-width: 1024px) {
    .grid-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-desc {
        margin: 0 auto var(--spacing-md);
    }
    
    .contact-section {
        grid-template-columns: 1fr;
    }
}

/* Mobile (768px) */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-links {
        display: none; /* Usually hidden behind a burger menu */
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .grid-cards {
        grid-template-columns: 1fr;
    }
    
    .footer-inner {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .footer-legal a {
        margin: 0 10px;
    }

    .status-card {
        left: 10px;
        bottom: 10px;
    }
}