/* ===================================
   BuildAssist.tech - Liquid Glass Design System
   =================================== */

/* CSS Variables */
:root {
    /* Construction-themed Color Palette */
    --primary-orange: #FF6B35;
    --primary-blue: #004E89;
    --accent-orange: #F7931E;
    --accent-blue: #1B98E0;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF6B35 0%, #F7931E 50%, #1B98E0 100%);
    --gradient-secondary: linear-gradient(135deg, #004E89 0%, #1B98E0 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius - Only two values allowed */
    --radius-large: 24px; /* rounded-2xl */
    --radius-full: 9999px; /* rounded-full */
    
    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ===================================
   Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: #fff;
    background: linear-gradient(135deg, #0a1128 0%, #1c2541 25%, #3a506b 50%, #5e7392 75%, #8da9c4 100%);
    background-attachment: fixed;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Navigation
   =================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s var(--transition-smooth);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-large);
}

.nav-menu a:hover {
    color: #fff;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
}

.nav-cta {
    background: var(--gradient-primary) !important;
    color: #fff !important;
    padding: 0.75rem 1.5rem !important;
    border-radius: var(--radius-full) !important;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #fff;
    border-radius: var(--radius-full);
    transition: all 0.3s var(--transition-smooth);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    border-radius: var(--radius-full);
    filter: blur(80px);
    opacity: 0.3;
    pointer-events: none;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: var(--gradient-primary);
    top: -10%;
    left: -10%;
    animation: float 20s infinite ease-in-out;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: var(--gradient-secondary);
    top: 30%;
    right: -5%;
    animation: float 15s infinite ease-in-out reverse;
}

.shape-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #F7931E 0%, #FF6B35 100%);
    bottom: -10%;
    left: 30%;
    animation: float 18s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(20px, -30px) rotate(5deg); }
    50% { transform: translate(-15px, 20px) rotate(-5deg); }
    75% { transform: translate(30px, 15px) rotate(3deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s var(--transition-smooth);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s 0.2s var(--transition-smooth) backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s 0.4s var(--transition-smooth) backwards;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s 0.6s var(--transition-smooth) backwards;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-large);
    box-shadow: var(--glass-shadow);
    min-width: 150px;
    transition: all 0.4s var(--transition-smooth);
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15), inset 0 0 20px rgba(255, 255, 255, 0.1);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 0.5rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: all 0.3s var(--transition-smooth);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4), inset 0 0 20px rgba(255, 255, 255, 0.2);
}

.btn-secondary {
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    color: #fff;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15), inset 0 0 20px rgba(255, 255, 255, 0.1);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.2rem;
}

/* ===================================
   Section Styles
   =================================== */

section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Features Section
   =================================== */

.features {
    background: rgba(0, 0, 0, 0.1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    padding: var(--spacing-md);
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-large);
    box-shadow: var(--glass-shadow);
    transition: all 0.4s var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2), inset 0 0 30px rgba(255, 255, 255, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: inline-block;
    transition: transform 0.3s var(--transition-bounce);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: #fff;
}

.feature-description {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

/* ===================================
   How It Works Section
   =================================== */

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.step-item {
    flex: 1;
    min-width: 250px;
    padding: var(--spacing-md);
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-large);
    box-shadow: var(--glass-shadow);
    transition: all 0.4s var(--transition-smooth);
}

.step-item:hover {
    transform: translateY(-5px) scale(1.02);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2), inset 0 0 30px rgba(255, 255, 255, 0.1);
}

.step-number {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-size: 1.8rem;
    font-weight: 800;
    color: #fff;
    margin: 0 auto var(--spacing-sm);
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}

.step-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    text-align: center;
}

.step-description {
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    line-height: 1.6;
}

.step-connector {
    width: 50px;
    height: 2px;
    background: var(--gradient-primary);
    flex-shrink: 0;
}

/* ===================================
   Use Cases Section
   =================================== */

.use-cases {
    background: rgba(0, 0, 0, 0.1);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.use-case-card {
    padding: var(--spacing-md);
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-large);
    box-shadow: var(--glass-shadow);
    transition: all 0.4s var(--transition-smooth);
    text-align: center;
}

.use-case-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2), inset 0 0 30px rgba(255, 255, 255, 0.1);
}

.use-case-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    display: inline-block;
    transition: transform 0.3s var(--transition-bounce);
}

.use-case-card:hover .use-case-icon {
    transform: scale(1.15) rotate(-5deg);
}

.use-case-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: #fff;
}

.use-case-description {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

/* ===================================
   CTA Section
   =================================== */

.cta {
    background: rgba(0, 0, 0, 0.2);
    padding: var(--spacing-xl) 0;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-large);
    box-shadow: var(--glass-shadow);
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-md);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.cta-note {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: #fff;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s var(--transition-smooth);
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(20px);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    color: #fff;
    text-decoration: none;
    transition: all 0.3s var(--transition-smooth);
}

.footer-social a:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* ===================================
   Fade In Animation
   =================================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--transition-smooth), transform 0.6s var(--transition-smooth);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        backdrop-filter: blur(20px) saturate(180%);
        background: rgba(10, 17, 40, 0.95);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        transition: left 0.3s var(--transition-smooth);
        border-bottom: 1px solid var(--glass-border);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .step-connector {
        display: none;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}