@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding-top: 80px; /* Account for fixed header */
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* SVG Icons */
.icon-svg {
    width: 2rem;
    height: 2rem;
    fill: currentColor;
}

.feature-icon .icon-svg {
    width: 2rem;
    height: 2rem;
    fill: white;
}

/* Process Animation */
.process-animation {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 4rem 3rem;
    margin: 3rem auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.process-steps {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin: 3rem 0;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.process-step {
    flex: 1;
    min-width: 200px;
    position: relative;
    opacity: 0.3;
    transform: translateY(20px);
    transition: all 0.8s ease;
}

.process-step.active {
    opacity: 1;
    transform: translateY(0);
}

.process-step .step-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.process-step .step-icon svg {
    width: 40px;
    height: 40px;
    fill: white;
}

.process-step h3 {
    color: #1a365d;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.process-step p {
    color: #4a5568;
    font-size: 0.9rem;
    line-height: 1.4;
}

.process-arrow {
    width: 60px;
    height: 20px;
    position: relative;
    opacity: 0;
    animation: fadeInArrow 0.8s ease forwards;
}

.process-arrow svg {
    width: 100%;
    height: 100%;
    fill: #667eea;
}

@keyframes fadeInArrow {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.time-highlight {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 600;
    display: inline-block;
    margin: 1rem 0;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    height: 50px;
    width: auto;
    border-radius: 8px;
}

header h1 {
    color: #1a365d;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
}

.auth-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.auth-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.login-btn {
    color: #667eea;
    border-color: #667eea;
    background: transparent;
}

.login-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.register-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.header-text h1 {
    font-size: 2rem;
    font-weight: 700;
    color: #1a365d;
    margin: 0;
}

.header-text p {
    font-size: 1rem;
    color: #4a5568;
    margin: 0.25rem 0 0 0;
    font-weight: 400;
}

/* Hero Section */
.hero {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    margin: 2rem auto;
    border-radius: 20px;
    padding: 4rem 3rem;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a365d;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: #4a5568;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Content Sections */
.content-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    margin: 2rem auto;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.content-section h2 {
    font-size: 1.875rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.icon {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.content-section p {
    font-size: 1.125rem;
    color: #4a5568;
    margin-bottom: 1.5rem;
}

.content-section ul, .content-section ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.content-section li {
    font-size: 1.125rem;
    color: #4a5568;
    margin-bottom: 0.75rem;
    padding-left: 0.5rem;
}

.content-section ul li {
    list-style: none;
    position: relative;
}

.content-section ul li::before {
    content: "✓";
    position: absolute;
    left: -1.5rem;
    color: #48bb78;
    font-weight: bold;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1rem;
}

.feature-card p {
    font-size: 1rem;
    color: #4a5568;
    line-height: 1.6;
}

.feature-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
    color: white;
    text-align: center;
    padding: 4rem 3rem;
    margin: 3rem auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.cta h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 100px;
    }
    
    .container {
        padding: 0 1.5rem;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .auth-buttons {
        order: -1;
        margin-bottom: 1rem;
    }
    
    .hero {
        padding: 2rem 1.5rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .content-section {
        padding: 2rem 1.5rem;
    }
    
    .cta {
        padding: 2rem 1.5rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-visual {
        margin-top: 2rem;
    }
    
    .invoice-demo {
        width: 100%;
    }
    
    .arrow {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .auth-btn {
        width: 100%;
        text-align: center;
    }
    
    .process-steps {
        flex-direction: column;
    }
    
    .process-arrow {
        transform: rotate(90deg);
        margin: 1rem 0;
    }
}

.highlight-text {
    font-size: 1.2rem;
    color: #48bb78;
    font-weight: 600;
}