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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #ffffff;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Navigation */
nav {
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid #e8e8e8;
}

.logo {
    font-size: 1.5em;
    font-weight: 700;
    color: #2563eb;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: #4a4a4a;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    padding: 120px 40px 80px;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    text-align: center;
}

.hero h1 {
    font-size: 3.5em;
    margin-bottom: 20px;
    font-weight: 700;
    color: #0f172a;
    letter-spacing: -1px;
    line-height: 1.1;
}

.hero .subtitle {
    font-size: 1.4em;
    color: #475569;
    margin-bottom: 15px;
    font-weight: 400;
}

.hero .credentials {
    font-size: 1em;
    color: #64748b;
    margin-bottom: 40px;
}

.cta-primary {
    background: #2563eb;
    color: white;
    padding: 16px 40px;
    border: none;
    border-radius: 8px;
    font-size: 1.05em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.cta-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
}

/* Features Section */
.features {
    padding: 100px 40px;
    background: #ffffff;
}

.section-title {
    text-align: center;
    font-size: 2.5em;
    margin-bottom: 20px;
    color: #0f172a;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2em;
    color: #64748b;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-card {
    background: #f8fafc;
    padding: 40px 30px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: #cbd5e1;
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.06);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border-radius: 10px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: white;
    fill: none;
    stroke-width: 2;
}

.feature-card h3 {
    font-size: 1.4em;
    margin-bottom: 12px;
    color: #0f172a;
    font-weight: 600;
}

.feature-card p {
    color: #475569;
    line-height: 1.7;
}

/* Tools Section */
.tools {
    padding: 100px 40px;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.tool-calculator {
    background: white;
    padding: 50px;
    border-radius: 16px;
    max-width: 600px;
    margin: 40px auto;
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    border: 1px solid #e2e8f0;
}

.tool-calculator h3 {
    font-size: 1.8em;
    margin-bottom: 12px;
    color: #0f172a;
    font-weight: 600;
}

.tool-description {
    color: #64748b;
    margin-bottom: 40px;
    line-height: 1.6;
}

.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #334155;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #2563eb;
}

.calculate-btn {
    width: 100%;
    background: #2563eb;
    color: white;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 1.05em;
    font-weight: 600;
    cursor: pointer;
    margin-top: 10px;
    transition: all 0.3s;
}

.calculate-btn:hover {
    background: #1d4ed8;
}

.result {
    margin-top: 30px;
    padding: 24px;
    background: #f0f9ff;
    border: 2px solid #bfdbfe;
    border-radius: 8px;
    display: none;
    color: #0c4a6e;
}

.result strong {
    font-size: 1.3em;
    display: block;
    margin-bottom: 8px;
}

.disclaimer {
    text-align: center;
    color: #64748b;
    margin-top: 24px;
    font-size: 0.9em;
}

/* About Section */
.about {
    padding: 100px 40px;
    background: #ffffff;
}

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

.about-content p {
    font-size: 1.2em;
    margin-bottom: 24px;
    line-height: 1.8;
    color: #475569;
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.credential-badge {
    background: #f8fafc;
    padding: 30px 20px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
}

.credential-badge strong {
    display: block;
    font-size: 1.1em;
    margin-bottom: 8px;
    color: #0f172a;
}

.credential-badge span {
    color: #64748b;
    font-size: 0.95em;
}

/* CTA Section */
.cta-section {
    padding: 100px 40px;
    background: linear-gradient(135deg, #1e40af 0%, #2563eb 100%);
    color: white;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5em;
    margin-bottom: 20px;
    font-weight: 700;
}

.cta-section p {
    font-size: 1.2em;
    margin-bottom: 40px;
    opacity: 0.95;
}

.email-signup {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
}

.email-signup input {
    flex: 1;
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
}

.email-signup button {
    background: #0f172a;
    color: white;
    padding: 14px 32px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.email-signup button:hover {
    background: #1e293b;
}

.benefits-list {
    margin-top: 30px;
    color: rgba(255,255,255,0.9);
}

/* Footer */
footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 40px 40px 30px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    margin: 20px 0;
}

.footer-links a {
    color: #cbd5e1;
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #ffffff;
}

.copyright {
    margin-top: 20px;
    opacity: 0.7;
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        padding: 20px;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: 80px 20px 60px;
    }
    
    .hero h1 {
        font-size: 2.2em;
    }
    
    .features, .tools, .about, .cta-section {
        padding: 60px 20px;
    }
    
    .email-signup {
        flex-direction: column;
    }
    
    .tool-calculator {
        padding: 30px 20px;
    }
    
    .section-title {
        font-size: 2em;
    }
}