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

:root {
    --primary-bg: #0f1419;
    --secondary-bg: #1a2332;
    --accent-blue: #ff9900;
    --accent-blue-light: #ffcc00;
    --accent-green: #ff9900;
    --text-primary: #ffffff;
    --text-secondary: #d1d5db;
    --border-color: #374151;
    --card-bg: #1f2937;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background-color: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.navbar-brand h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-blue-light);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.nav-menu a:hover {
    color: var(--accent-blue-light);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--primary-bg) 100%);
    padding: 80px 20px;
    border-bottom: 1px solid var(--border-color);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h2 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-blue-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-blue-light);
    margin-bottom: 0.5rem;
}

.hero-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.version-info {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--accent-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    border-radius: 40px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--secondary-bg);
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Sections */
section {
    padding: 60px 20px;
}

section h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.section-intro {
    color: var(--text-secondary);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
}

/* Overview Section */
.overview {
    background-color: var(--primary-bg);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    background: var(--secondary-bg);
    border-color: var(--accent-blue);
    box-shadow: 0 20px 40px rgba(37, 99, 235, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Details Table */
.details-table {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.specs-table {
    width: 100%;
    margin-top: 2rem;
    border-collapse: collapse;
}

.specs-table tr {
    border-bottom: 1px solid var(--border-color);
}

.specs-table tr:last-child {
    border-bottom: none;
}

.specs-table td {
    padding: 1.25rem;
    color: var(--text-secondary);
}

.specs-table td:first-child {
    font-weight: 600;
    color: var(--accent-blue-light);
    width: 40%;
}

.specs-table tr:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

/* Installation Section */
.installation {
    background-color: var(--primary-bg);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.step-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    position: relative;
    transition: all 0.3s ease;
}

.step-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-light));
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.step-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.note {
    background: rgba(37, 99, 235, 0.1);
    border-left: 4px solid var(--accent-blue);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
    color: var(--text-secondary);
}

.note strong {
    color: var(--accent-blue-light);
}

/* Content Features */
.content-features {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.content-item {
    background: rgba(0, 0, 0, 0.3);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.content-item:hover {
    background: var(--card-bg);
    border-color: var(--accent-blue);
    transform: translateY(-4px);
}

.content-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.content-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Compatibility */
.compatibility {
    background-color: var(--primary-bg);
}

.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.device-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
}

.device-card:hover {
    background: var(--secondary-bg);
    border-color: var(--accent-green);
    transform: translateY(-4px);
}

.device-card h3 {
    font-size: 1.15rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.device-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Troubleshooting */
.troubleshooting {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
}

.trouble-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.trouble-item {
    background: rgba(0, 0, 0, 0.3);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--accent-blue);
    transition: all 0.3s ease;
}

.trouble-item:hover {
    background: var(--card-bg);
    transform: translateX(4px);
}

.trouble-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.trouble-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Safety */
.safety {
    background-color: var(--primary-bg);
}

.safety-dos {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--accent-green);
    margin-top: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.safety-dos h3 {
    color: var(--accent-green);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.safety-dos ul {
    list-style: none;
    color: var(--text-secondary);
}

.safety-dos li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.safety-dos li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: bold;
}

/* FAQ */
.faq {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
}

.faq-item {
    background: var(--card-bg);
    padding: 1.75rem;
    margin: 1rem 0;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--accent-blue);
    background: rgba(37, 99, 235, 0.05);
}

.faq-item h3 {
    font-size: 1.1rem;
    color: var(--accent-blue-light);
    margin-bottom: 0.75rem;
    cursor: pointer;
}

.faq-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* CTA Final */
.cta-final {
    background: linear-gradient(135deg, var(--secondary-bg) 0%, rgba(37, 99, 235, 0.1) 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.cta-final h2 {
    margin-bottom: 1rem;
}

.cta-final p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
.footer {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 20px 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--accent-blue-light);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
    color: var(--text-secondary);
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--accent-blue-light);
}

.footer-section li {
    padding: 0.5rem 0;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    section h2 {
        font-size: 1.75rem;
    }

    .feature-grid,
    .steps,
    .content-grid,
    .device-grid,
    .trouble-grid {
        grid-template-columns: 1fr;
    }

    .specs-table td {
        padding: 0.75rem;
        font-size: 0.9rem;
    }

    .btn-lg {
        padding: 0.85rem 2rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 0.5rem 0;
    }

    .hero {
        padding: 40px 20px;
    }

    .hero-content h2 {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

    section {
        padding: 40px 20px;
    }

    section h2 {
        font-size: 1.5rem;
    }
}