:root {
    --bg-color: #F0F4F8;
    --surface-color: #FFFFFF;
    --border-color: #CBD5E1;
    --primary-color: #0F2C59;
    --primary-hover: #1E4072;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --hero-bg: #DAE4F0;
    --btn-gradient: linear-gradient(135deg, #FF416C 0%, #FF4B2B 100%);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

/* 1. Navigation Header (Sticky) */
.nav-header {
    position: sticky;
    top: 0;
    height: 64px;
    background-color: var(--surface-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 1000;
}

.nav-logo {
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.5rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    height: 32px;
    width: 32px;
    background-color: white;
    border-radius: 50%;
    padding: 2px;
    border: 1px solid var(--border-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.nav-cta {
    background: var(--btn-gradient);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0 4px 6px rgba(255, 75, 43, 0.2);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: background-color 0.2s;
    margin-left: auto;
    order: 2;
}

.mobile-menu-toggle:hover {
    background-color: rgba(15, 44, 89, 0.1);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* 2. Hero Section */
.hero-section {
    background: var(--hero-bg);
    display: flex;
    min-height: 80vh;
    align-items: center;
    padding: 4rem 2rem;
    gap: 2rem;
}

.hero-content {
    flex: 0 0 40%;
}

.hero-visual {
    flex: 0 0 60%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.hero-cta-block {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
}

.btn-primary {
    background: var(--btn-gradient);
    color: white;
    padding: 1rem 2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    display: inline-block;
}

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

.link-secondary {
    color: var(--primary-color);
    text-decoration: underline;
    cursor: pointer;
}

.mockup-container {
    width: 100%;
    max-width: 800px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.3s ease;
}
.mockup-container:hover {
    transform: perspective(1000px) rotateY(0) rotateX(0);
}

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

.mockup-placeholder {
    width: 100%;
    height: 400px;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ccc;
}

/* 3. Trust Bar */
.trust-bar {
    background-color: var(--surface-color);
    padding: 2rem;
    text-align: center;
}

.trust-label {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.trust-logos {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    opacity: 0.6;
    filter: grayscale(100%);
}

.trust-logo-placeholder {
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* 4. Problem/Solution Bridge */
.bridge-section {
    background-color: var(--bg-color);
    padding: 4rem 2rem;
}

.bridge-block {
    display: flex;
    align-items: center;
    gap: 4rem;
    margin-bottom: 4rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.bridge-block.reverse {
    flex-direction: row-reverse;
}

.bridge-text {
    flex: 1;
}

.bridge-visual {
    flex: 1;
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.visual-placeholder {
    width: 100%;
    height: 300px;
    background: #eee;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
}

.bridge-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 5. Core Features Showcase */
.features-section {
    background-color: var(--surface-color);
    padding: 4rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-title {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: bold;
    font-size: 1.25rem;
}

/* 6. Use Cases / Persona Cards */
.use-cases-section {
    background-color: var(--bg-color);
    padding: 4rem 2rem;
}

.persona-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.persona-card {
    padding: 2rem;
    border-radius: 8px;
}

.persona-card.engineer { background-color: #E0F2F1; }
.persona-card.writer { background-color: #FFF8E1; }
.persona-card.qa { background-color: #E3F2FD; }

.persona-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: bold;
    font-size: 1.25rem;
}

/* 7. Final CTA */
.final-cta-section {
    background-color: var(--primary-color);
    padding: 4rem 2rem;
    text-align: center;
    color: white;
}

.final-cta-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        flex-direction: column-reverse;
        text-align: center;
        padding: 2rem 1rem;
    }
    
    .hero-content, .hero-visual {
        flex: 1 1 100%;
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        line-height: 1.5;
    }
    
    .hero-cta-block {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .bridge-block, .bridge-block.reverse {
        flex-direction: column;
        text-align: center;
        padding: 2rem 1rem;
    }
    
    .bridge-content {
        order: 2;
    }
    
    .bridge-visual {
        order: 1;
        margin-bottom: 2rem;
    }
    
    .nav-header {
        padding: 1rem;
        flex-wrap: wrap;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--primary-color);
        flex-direction: column;
        gap: 0;
        padding: 16px 0;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }
    
    .nav-links.mobile-open {
        display: flex;
    }
    
    .nav-links a {
        padding: 12px 24px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        color: white;
        text-decoration: none;
        font-size: 1rem;
    }
    
    .nav-links a:last-child {
        border-bottom: none;
    }
    
    .nav-cta {
        margin-left: auto;
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
        order: 3;
    }
    
    .trust-bar {
        padding: 1.5rem 1rem;
    }
    
    .features-section {
        padding: 2rem 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .testimonials-section {
        padding: 2rem 1rem;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-section {
        padding: 2rem 1rem;
    }
    
    .footer-section {
        padding: 2rem 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
}