:root {
    --primary-color: #3b82f6;
    --secondary-color: #1d4ed8;
    --text-color: #f1f5f9;
    --text-secondary: #cbd5e1;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --border-color: #475569;
    --white: #ffffff;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --card-bg: #1e293b;
    --card-border: #334155;
}

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

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

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

/* Header */
header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

.logo img {
    height: 40px;
    margin-right: 10px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--white);
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

.cta-button {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: 1px solid var(--primary-color);
}

.cta-button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-color);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('images/background.jpg') center/cover;
    opacity: 0.05;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

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

.hero-image {
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 1rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* App Information Section */
.app-info {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

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

.info-card {
    padding: 2rem;
    border-radius: 1rem;
    background: var(--card-bg);
    border-left: 4px solid var(--primary-color);
    border: 1px solid var(--card-border);
}

.info-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: var(--bg-primary);
}

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

.section-header h2 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

.feature-card {
    padding: 2rem;
    border-radius: 1rem;
    background: var(--card-bg);
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--card-border);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.4);
    border-color: var(--primary-color);
}

.feature-card h3 {
    margin: 1rem 0;
    color: var(--text-color);
    font-size: 1.2rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Data Usage Section */
.data-usage {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.data-usage-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.data-usage h2 {
    color: var(--text-color);
    margin-bottom: 2rem;
}

.data-usage p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.data-list {
    text-align: left;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    margin-top: 2rem;
    border: 1px solid var(--card-border);
}

.data-list h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.data-list ul {
    list-style: none;
    padding: 0;
}

.data-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.data-list li:before {
    content: "✓";
    color: var(--success-color);
    font-weight: bold;
    margin-right: 1rem;
}

/* Testimonials */
.testimonials {
    padding: 4rem 0;
    background: var(--bg-primary);
}

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

.testimonial-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    border: 1px solid var(--card-border);
}

.testimonial-card p {
    font-style: italic;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.testimonial-card cite {
    font-style: normal;
    font-weight: 600;
    color: var(--primary-color);
}

/* FAQ Styles */
.faq {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

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

.faq-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    transition: transform 0.3s ease;
    border: 1px solid var(--card-border);
}

.faq-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* CTA Section */
.cta-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: var(--text-color);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.cta-section p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.download-button {
    display: inline-block;
    transition: transform 0.3s;
}

.download-button:hover {
    transform: scale(1.05);
}

.app-store-button {
    opacity: 0.6;
    cursor: not-allowed;
}

.app-store-button:hover {
    transform: none;
    opacity: 0.6;
}

/* Contact Section */
.contact {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.contact-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--card-border);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.contact-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.contact-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.contact-link:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.contact-form {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--card-border);
}

.contact-form h3 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 1.3rem;
}

.contact-form-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--bg-primary);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.submit-btn {
    background: var(--primary-color);
    color: var(--white);
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.submit-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

/* Footer */
footer {
    background: var(--bg-primary);
    color: var(--text-color);
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-links h4 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.5rem;
    display: block;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .nav-links {
        display: none;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-form {
        padding: 1.5rem;
    }

    .submit-btn {
        padding: 0.875rem 1.5rem;
    }

    .download-buttons {
        flex-direction: column;
        gap: 1.5rem;
    }

    .download-button img {
        height: 60px !important;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}