:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-bg: #f8f9fa;
    --dark-bg: #1a1d20;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light-bg);
    color: #333;
    line-height: 1.6;
}

.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 0.8rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
}

.navbar-brand i {
    margin-right: 0.5rem;
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem;
    margin: 0 0.2rem;
    border-radius: 0.375rem;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover, 
.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,197.3C1248,203,1344,149,1392,122.7L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn-hero {
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

.btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.section-title {
    font-weight: 700;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.section-title.center::after {
    left: 50%;
    transform: translateX(-50%);
}

.feature-card {
    background: white;
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    height: 100%;
    text-align: center;
}

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

.feature-icon {
    width: 70px;
    height: 70px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
    font-size: 1.75rem;
}

.feature-title {
    font-weight: 600;
    margin-bottom: 1rem;
}

.card {
    border: none;
    border-radius: 0.75rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--hover-shadow);
}

.card-header {
    background-color: white;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.25rem 1.5rem;
    border-radius: 0.75rem 0.75rem 0 0 !important;
}

.stats-card {
    color: white;
    border-radius: 0.75rem;
    padding: 1.5rem;
    height: 100%;
}

.stats-card.bg-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
}

.stats-card.bg-success {
    background: linear-gradient(135deg, #27ae60, #219653) !important;
}

.stats-card.bg-info {
    background: linear-gradient(135deg, #17a2b8, #138496) !important;
}

.stats-card.bg-warning {
    background: linear-gradient(135deg, #f39c12, #e67e22) !important;
}

.table th {
    border-top: none;
    font-weight: 600;
    color: var(--secondary-color);
    background-color: #f8f9fa;
}

.badge {
    font-weight: 500;
    padding: 0.4em 0.6em;
}

.invoice-preview {
    border: 1px solid #e9ecef;
    border-radius: 0.5rem;
    padding: 2rem;
    background: white;
}

.invoice-header {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer h5 {
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin-right: 0.5rem;
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* Pricing Section */
.pricing-card {
    border: 1px solid #e9ecef;
    border-radius: 0.75rem;
    overflow: hidden;
    transition: var(--transition);
    background: white;
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.pricing-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 2rem;
    text-align: center;
}

.pricing-header.featured {
    background: linear-gradient(135deg, var(--warning-color), #e67e22);
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 1rem 0;
}

.pricing-period {
    font-size: 1rem;
    opacity: 0.8;
}

.pricing-features {
    padding: 2rem;
}

.pricing-features ul {
    list-style: none;
    padding: 0;
}

.pricing-features li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
}

.pricing-features li i {
    color: var(--success-color);
    margin-right: 0.75rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .navbar-nav {
        text-align: center;
        margin-top: 1rem;
    }
    
    .pricing-card.featured {
        transform: none;
        margin: 1rem 0;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .btn-hero {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    body {
        background-color: var(--dark-bg);
        color: #e9ecef;
    }
    
    .card, .feature-card, .invoice-preview {
        background-color: #2d3035;
        color: #e9ecef;
    }
    
    .table {
        --bs-table-bg: #2d3035;
        --bs-table-color: #e9ecef;
    }
    
    .table th {
        background-color: #343a40;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

.pulse {
    animation: pulse 2s infinite;
}

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

/* Additional utility classes */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.page-container {
    display: none;
}

.active-page {
    display: block;
}

.currency-symbol {
    font-weight: 600;
}

.input-group-text.currency-symbol {
    background-color: #f8f9fa;
    border-color: #dee2e6;
    font-weight: 600;
    min-width: 40px;
    justify-content: center;
}

.currency-display {
    display: flex;
    align-items: center;
    gap: 4px;
}

.currency-card {
    transition: transform 0.2s ease-in-out;
}

.currency-card:hover {
    transform: translateY(-2px);
}

/* Print styles */
@media print {
    .navbar, .btn-group, .alert, .no-print {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
        font-size: 12pt;
    }
    
    .card {
        border: none !important;
        box-shadow: none !important;
    }
    
    .table {
        border: 1px solid #000 !important;
    }
    
    .table th, .table td {
        border: 1px solid #000 !important;
        background: white !important;
        color: black !important;
    }
    
    .text-primary {
        color: #000 !important;
    }
    
    a {
        color: #000 !important;
        text-decoration: none !important;
    }
    
    .invoice-table {
        border: 1px solid #000 !important;
    }
    
    .invoice-table th {
        background-color: #f0f0f0 !important;
        -webkit-print-color-adjust: exact;
    }
    
    .total-amount {
        color: #000 !important;
    }
    
    .payment-instructions {
        background-color: #f0f0f0 !important;
        -webkit-print-color-adjust: exact;
    }

    .currency-symbol {
        font-weight: bold !important;
    }
    
    .input-group-text {
        background-color: #f0f0f0 !important;
        -webkit-print-color-adjust: exact;
    }
}