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

:root {
    --primary-color: #C62E2E;
    --secondary-color: #1e1e1e;
    --accent-color: #C1E172;
    --background-color: #f8f9fa;
    --text-color: #1e1e1e;
    --text-muted: #6c757d;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    font-size: 1rem;
}

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

/* Header Styles */
.header {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    opacity: 0.8;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #a82525 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-badges {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Main Content */
.main-content {
    padding: 3rem 0;
}

.tool-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.invoice-form-card {
    background-color: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 2.5rem;
}

/* Form Sections */
.form-section {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 2px solid var(--background-color);
}

.form-section:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.form-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.form-section h2 i {
    color: var(--primary-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    margin-bottom: 0;
}

/* Form Grid */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(198, 46, 46, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Line Items */
#lineItems {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.line-item {
    padding: 1.5rem;
    background-color: var(--background-color);
    border-radius: var(--radius-sm);
    position: relative;
}

.line-item-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
}

.line-item .form-group label {
    font-size: 0.85rem;
}

.btn-remove {
    background-color: transparent;
    border: none;
    color: var(--primary-color);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.75rem;
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

.btn-remove:hover {
    background-color: rgba(198, 46, 46, 0.1);
    transform: scale(1.1);
}

/* Totals Section */
.totals-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.totals-summary {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    font-size: 1.1rem;
}

.total-row:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.total-final {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    justify-content: center;
}

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

.btn-primary:hover {
    background-color: #a82525;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

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

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* Features Section */
.features {
    padding: 5rem 0;
    background-color: var(--white);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

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

.feature-card {
    padding: 2rem;
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* How to Use Section */
.how-to-use {
    padding: 5rem 0;
    background-color: var(--background-color);
}

.how-to-use h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.step p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #2d2d2d 100%);
    color: var(--white);
}

.cta-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.cta-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.cta-text p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.8;
}

.cta-features {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
}

.cta-feature i {
    color: var(--accent-color);
    font-size: 1.25rem;
}

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

.cta-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.cta-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: var(--radius-md);
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.cta-card i {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.cta-card h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

/* Content Section */
.content-section {
    padding: 5rem 0;
    background-color: var(--white);
}

.content-article {
    max-width: 800px;
    margin: 0 auto;
}

.content-article h2 {
    font-size: 2.25rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

.content-article h3 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.content-article p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
    color: var(--text-muted);
}

/* FAQ Section */
.faq-section {
    padding: 5rem 0;
    background-color: var(--background-color);
}

.faq-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background-color: transparent;
    border: none;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-color);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-question i {
    transition: var(--transition);
    color: var(--primary-color);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand p {
    margin: 1rem 0;
    opacity: 0.8;
    line-height: 1.7;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-column ul {
    list-style: none;
}

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

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .invoice-form-card {
        padding: 1.5rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .line-item-grid {
        grid-template-columns: 1fr;
    }
    
    .totals-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-content {
        grid-template-columns: 1fr;
    }
    
    .cta-visual {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .features h2,
    .how-to-use h2,
    .faq-section h2 {
        font-size: 1.75rem;
    }
    
    .cta-text h2 {
        font-size: 1.75rem;
    }
    
    .cta-features {
        flex-direction: column;
        gap: 1rem;
    }
}