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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #e4e4e7;
    background-color: #0a0a0a;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0f172a 100%);
    color: white;
    padding: 120px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero > .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.35rem;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 16px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: #06b6d4;
    color: #0a0a0a;
    font-weight: 700;
}

.btn-primary:hover {
    background-color: #0891b2;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid #06b6d4;
}

.btn-secondary:hover {
    background-color: rgba(6, 182, 212, 0.1);
    border-color: #0891b2;
    transform: translateY(-2px);
}

/* Sections */
section {
    padding: 80px 0;
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
    font-weight: 700;
    color: #f4f4f5;
}

section p {
    font-size: 1.2rem;
    color: #a1a1aa;
    margin-bottom: 16px;
}

.section-gray {
    background-color: #141414;
}

/* What is Section */
.what-is {
    text-align: center;
}

.what-is p {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Problem Section */
.problem {
    background-color: #141414;
}

.problem h2 {
    margin-bottom: 32px;
}

.problem p {
    margin-bottom: 20px;
}

/* Benefits Section */
.benefits ul {
    list-style: none;
    margin-top: 32px;
}

.benefits li {
    font-size: 1.2rem;
    margin-bottom: 24px;
    padding-left: 40px;
    position: relative;
    color: #d4d4d8;
}

.benefits li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #06b6d4;
    font-weight: bold;
    font-size: 1.5rem;
}

.benefits strong {
    color: #f4f4f5;
    font-weight: 600;
}

/* How it Works */
.how-it-works {
    background-color: #141414;
}

.steps {
    margin-top: 48px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.step {
    text-align: center;
}

.step-number {
    display: inline-block;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    color: #0a0a0a;
    border-radius: 50%;
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 60px;
    margin-bottom: 20px;
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: #f4f4f5;
}

.step p {
    font-size: 1.1rem;
    color: #a1a1aa;
}

/* Installation Gallery */
.installation-gallery {
    background-color: #0a0a0a;
    text-align: center;
}

.installation-gallery h2 {
    margin-bottom: 16px;
}

.gallery-intro {
    font-size: 1.15rem;
    color: #a1a1aa;
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.gallery-container {
    width: 100%;
    overflow: hidden;
    margin-bottom: 24px;
}

.gallery-scroll {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    padding: 20px 0;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: #27272a #141414;
}

.gallery-scroll::-webkit-scrollbar {
    height: 8px;
}

.gallery-scroll::-webkit-scrollbar-track {
    background: #141414;
    border-radius: 4px;
}

.gallery-scroll::-webkit-scrollbar-thumb {
    background: #27272a;
    border-radius: 4px;
}

.gallery-scroll::-webkit-scrollbar-thumb:hover {
    background: #3f3f46;
}

.gallery-item {
    flex: 0 0 auto;
    width: 500px;
    background-color: #141414;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #27272a;
    transition: all 0.3s ease;
}

.gallery-item:hover {
    border-color: #06b6d4;
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.2);
}

.gallery-item img {
    width: 100%;
    height: 320px;
    object-fit: contain;
    background-color: #1a1a1a;
    display: block;
    border-bottom: 1px solid #27272a;
}

.gallery-caption {
    padding: 20px;
    text-align: left;
}

.step-label {
    display: inline-block;
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    color: #0a0a0a;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.gallery-caption p {
    color: #e4e4e7;
    font-size: 1.1rem;
    font-weight: 500;
    margin: 8px 0 0 0;
}

.gallery-note {
    color: #71717a;
    font-size: 0.95rem;
    font-style: italic;
    margin-top: 16px;
}

/* Usage Gallery */
.usage-gallery {
    background-color: #141414;
    text-align: center;
}

.usage-gallery h2 {
    margin-bottom: 16px;
}

/* For Whom */
.for-whom ul {
    list-style: none;
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.for-whom li {
    font-size: 1.2rem;
    padding: 20px;
    background-color: #1a1a1a;
    border-radius: 8px;
    padding-left: 50px;
    position: relative;
    border: 1px solid #27272a;
}

.for-whom li:before {
    content: "→";
    position: absolute;
    left: 20px;
    color: #06b6d4;
    font-weight: bold;
    font-size: 1.5rem;
}

/* Free Section */
.free {
    background: linear-gradient(135deg, #0a0a0a 0%, #0f172a 50%, #1a1a1a 100%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.free:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(14, 165, 233, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.free > .container-narrow {
    position: relative;
    z-index: 1;
}

.free h2 {
    color: white;
    margin-bottom: 24px;
}

.free p {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 20px;
    color: rgba(255,255,255,0.95);
}

.free .highlight {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 32px;
    display: block;
}

/* Final CTA */
.final-cta {
    text-align: center;
    padding: 100px 0;
}

.final-cta h2 {
    margin-bottom: 20px;
}

.final-cta p {
    font-size: 1.3rem;
    color: #a1a1aa;
    margin-bottom: 40px;
}

/* Footer */
footer {
    background-color: #0a0a0a;
    color: white;
    text-align: center;
    padding: 60px 0;
    border-top: 1px solid #27272a;
}

footer h3 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

footer .version {
    color: #71717a;
    margin-bottom: 16px;
    font-size: 0.95rem;
}

footer .tagline {
    font-style: italic;
    color: #a1a1aa;
    font-size: 1.1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.15rem;
    }

    section h2 {
        font-size: 2rem;
    }

    section p, .benefits li, .for-whom li {
        font-size: 1.1rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .gallery-item {
        width: 320px;
    }

    .gallery-item img {
        height: 240px;
    }
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}