/* Trustworthy Digital Signature App Theme - Updated with #20A3E5 (Strong Blue) */
:root {
    --primary: #1a365d; /* Deep blue */
    --secondary: #20A3E5; /* Strong blue (user's choice) */
    --accent: #20A3E5; /* Use strong blue for accent */
    --background: #f7fafc; /* Light background */
    --surface: #ffffff; /* Card background */
    --text: #222b45; /* Main text */
    --muted: #718096; /* Muted text */
    --success: #38a169; /* Green for success */
}
body {
    background: var(--background);
    color: var(--text);
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
}
.hero {
    background: #1A365D;
    color: #fff;
    padding: 3rem 1rem 2rem 1rem;
    text-align: center;
}
.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}
.button-container .btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    margin: 0 0.5rem;
    transition: background 0.2s, color 0.2s;
}
.btn.primary {
    background: var(--accent);
    color: #fff;
}
.btn.primary:hover {
    background: var(--success);
}
.btn.secondary {
    background: #fff;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn.secondary:hover {
    background: var(--primary);
    color: #fff;
}
.features {
    background: var(--surface);
    padding: 2rem 1rem;
    text-align: center;
}
.features h2 {
    color: var(--primary);
    margin-bottom: 2rem;
}
.feature-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}
.feature-card {
    background: var(--background);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(32,163,229,0.10); /* Use new blue for shadow */
    padding: 2rem 1.5rem;
    max-width: 300px;
    flex: 1 1 250px;
}
.feature-icon, .feature-card i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 1rem;
}
.feature-card h3 {
    color: var(--secondary);
    margin-bottom: 0.5rem;
}
.feature-card p {
    color: var(--muted);
}
@media (max-width: 800px) {
    .feature-container {
        flex-direction: column;
        align-items: center;
    }
}
footer, .footer-content, .footer-section, .footer-bottom {
    background: var(--primary);
    color: #fff;
}
.footer-section h3 {
    color: var(--accent);
}
.footer-section p, .footer-bottom p {
    color: #e2e8f0;
}
.social-icons a {
    color: var(--accent);
    transition: color 0.2s;
}
.social-icons a:hover {
    color: var(--success);
}
.logo-container h1 {
    color: var(--secondary);
}
nav ul li a {
    color: var(--secondary);
    transition: color 0.2s;
}
nav ul li a:hover {
    color: var(--accent);
}
header {
    background: var(--surface);
    border-bottom: 1px solid var(--secondary);
}
.cta {
    background: linear-gradient(120deg, #e9ecef 60%, #bfc9d1 100%); /* Grayish gradient */
    color: var(--primary);
    padding: 3rem 1rem 2rem 1rem;
    text-align: center;
    border-radius: 12px;
    margin: 2rem 0;
}
.cta .btn.primary {
    background: var(--secondary);
    color: #fff;
}
.cta .btn.secondary {
    background: #fff;
    color: var(--secondary);
    border: 2px solid var(--secondary);
}
.cta .btn.secondary:hover {
    background: var(--secondary);
    color: #fff;
}
section {
    border-bottom: 1px solid #d1d5db;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
}
section:last-of-type {
    border-bottom: none;
}