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

:root {
    --primary-color: #1a7ca8;
    --primary-dark: #155d7f;
    --primary-light: #2196c7;
    --secondary-color: #2c3e50;
    --text-dark: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
}

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

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

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 20px 0;
    box-shadow: var(--shadow);
}

.logo {
    height: 50px;
    filter: brightness(0) invert(1);
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 20px 30px;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.3rem;
    color: var(--text-light);
    font-weight: 400;
}

/* Description Section */
.description {
    max-width: 800px;
    margin: 0 auto 50px;
    padding: 0 20px;
    text-align: center;
}

.description p {
    font-size: 1.05rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* Download Section */
.download-section {
    display: flex;
    justify-content: center;
    margin: 50px 0;
    padding: 0 20px;
}

.download-card {
    background: var(--white);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 400px;
    width: 100%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.card-icon {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 25px;
    font-weight: 600;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--white);
    padding: 15px 40px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(26, 124, 168, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 124, 168, 0.4);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
}

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

/* Steps Section */
.steps {
    max-width: 900px;
    margin: 60px auto;
    padding: 0 20px;
}

.steps h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 40px;
    font-weight: 700;
}

.steps-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.step {
    display: flex;
    gap: 25px;
    background: var(--white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(26, 124, 168, 0.3);
}

.step-content h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 10px;
    font-weight: 600;
}

.step-content p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1rem;
}

/* Security Note */
.security-note {
    max-width: 900px;
    margin: 50px auto;
    padding: 25px;
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border-left: 5px solid var(--success-color);
    border-radius: 8px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.note-icon {
    flex-shrink: 0;
    color: var(--success-color);
}

.note-content p {
    color: var(--text-dark);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: var(--secondary-color);
    color: var(--white);
    text-align: center;
    padding: 30px 20px;
    margin-top: 80px;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .download-card {
        padding: 30px 20px;
    }

    .step {
        flex-direction: column;
        gap: 15px;
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    .security-note {
        flex-direction: column;
        gap: 15px;
    }

    .steps h2 {
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .download-btn {
        padding: 12px 30px;
        font-size: 1rem;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero, .description, .download-section, .steps, .security-note {
    animation: fadeIn 0.6s ease-out;
}

.step:nth-child(1) {
    animation-delay: 0.1s;
}

.step:nth-child(2) {
    animation-delay: 0.2s;
}

.step:nth-child(3) {
    animation-delay: 0.3s;
}