/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

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

/* Header and Navigation */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo h1 {
    font-size: 1.5rem;
    color: #2563eb;
    font-weight: 600;
}

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

.nav-links a {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s ease;
    cursor: pointer;
}

.nav-links a:hover,
.nav-links a.active {
    color: #2563eb;
}

.lang-btn {
    background: #f3f4f6;
    border: 1px solid #d1d5db;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: #e5e7eb;
}

/* Main Content */
main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

.section {
    display: none;
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

.section.active {
    display: block;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #1f2937;
    font-weight: 700;
}

.hero h2.app-highlight {
    font-size: 3.5rem;
    color: #2563eb;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    color: #6b7280;
    margin-bottom: 3rem;
}

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

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: #f8fafc;
    color: #475569;
    border: 2px solid #e2e8f0;
}

.btn-secondary:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Content Cards */
.content-card {
    background: white;
    border-radius: 12px;
    padding: 3rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin: 2rem auto;
    max-width: 800px;
}

.content-card h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #1f2937;
    text-align: center;
}

.content-card h2 {
    font-size: 1.8rem;
    margin: 2rem 0 1rem 0;
    color: #374151;
}

.content-card h3 {
    font-size: 1.3rem;
    margin: 1.5rem 0 0.5rem 0;
    color: #4b5563;
}

.content-card p {
    margin-bottom: 1rem;
    color: #6b7280;
    line-height: 1.7;
}

.content-card ul {
    margin: 1rem 0 1rem 2rem;
    color: #6b7280;
}

.content-card li {
    margin-bottom: 0.5rem;
}

/* App Name Highlighting */
.app-name-placeholder {
    color: #2563eb;
    font-weight: 600;
}

/* Contact Methods */
.contact-methods {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.contact-item h3 {
    color: #374151;
    margin-bottom: 0.5rem;
}

.contact-item a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
}

.contact-item a:hover {
    text-decoration: underline;
}

.response-time {
    background: #f0f9ff;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
    border-left: 4px solid #2563eb;
}

.update-info {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e5e7eb;
    color: #9ca3af;
    font-size: 0.9rem;
}

/* Footer */
footer {
    background: #1f2937;
    color: #9ca3af;
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    main {
        margin-top: 120px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero h2.app-highlight {
        font-size: 2.5rem;
    }

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

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

    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 280px;
    }

    .content-card {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }

    .content-card h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 2rem 0;
    }

    .content-card {
        padding: 1.5rem 1rem;
    }
}

/* Smooth Transitions */
.section {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.section.active {
    opacity: 1;
    transform: translateY(0);
}

/* Loading Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-card {
    animation: fadeIn 0.6s ease-out;
}