:root {
    --primary: #6C63FF;
    --primary-light: #8A84FF;
    --secondary: #FF6584;
    --accent: #36D1DC;
    --success: #4CAF50;
    --warning: #FF9800;
    --light: #f8f9fa;
    --dark: #2D3748;
    --gray: #718096;
    --light-gray: #E2E8F0;
    --border-radius: 12px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
    --gradient: linear-gradient(135deg, #6C63FF 0%, #36D1DC 100%);
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #f5f7ff 0%, #e6eeff 100%);
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    margin-right: 10px;
    font-size: 1.8rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

nav a:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--gradient);
    transition: var(--transition);
}

nav a:hover:after {
    width: 100%;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(108, 99, 255, 0.4);
}

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

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark);
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 100px 0;
    text-align: center;
    background: var(--gradient);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiB2aWV3Qm94PSIwIDAgMTIwMCA4MDAiIHByZXNlcnZlQXNwZWN0UmF0aW89Im5vbmUiPjxwYXRoIGQ9Ik0wIDBoMTIwMHY4MDBIMHoiIGZpbGw9IiM2QzYzRkYiLz48cGF0aCBkPSJNMCA0MDBjMTUwLTIwMCAzMDAtMjAwIDQ1MC0xMDBzMzAwIDMwMCA0NTAgMzAwIDMwMCAwIDMwMC0yMDB2NDAwSDB6IiBmaWxsLW9wYWNpdHk9Ii4xIiBmaWxsPSIjZmZmIi8+PC9zdmc+');
    opacity: 0.1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    position: relative;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
    position: relative;
}

.cta-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    position: relative;
}

/* Features Section */
.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--dark);
    position: relative;
    display: inline-block;
}

.section-title h2:after {
    content: '';
    position: absolute;
    width: 70px;
    height: 4px;
    background: var(--gradient);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.section-title p {
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

.features {
    padding: 100px 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
    border-top: 4px solid var(--primary);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 1.8rem;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
}

/* Invoice Generator */
.invoice-generator {
    padding: 70px 0;
    background: var(--light-gray);
}

.invoice-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.invoice-form {
    background: white;
    border-radius: var(--border-radius);
    padding: 10px;
    box-shadow: var(--box-shadow);
    flex: 0 0 70%;
}

.invoice-preview {
    background: white;
    border-radius: var(--border-radius);
    padding: 10px;
    box-shadow: var(--box-shadow);
    flex: 0 0 30%;
    display: flex;
    flex-direction: column;
    height: fit-content;
    position: sticky;
    top: 70px;
}

.form-group {
    margin-bottom: 5px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 5px 8px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: 'Poppins', sans-serif;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

/* Logo Upload */
.logo-upload {
    border: 2px dashed var(--light-gray);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    margin-bottom: 15px;
    transition: var(--transition);
    cursor: pointer;
}

.logo-upload:hover, .logo-upload.dragover {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.05);
}

.logo-preview {
    display: none;
    margin-top: 15px;
    text-align: center;
}

.logo-preview img {
    max-height: 100px;
    max-width: 100%;
    border-radius: 8px;
}

.remove-logo {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: var(--border-radius);
    margin-top: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.remove-logo:hover {
    background: #e04e6d;
}

/* Invoice Items */
.invoice-items {
    margin: 30px 0;
}

.invoice-items h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: 10px;
    align-items: end;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--light-gray);
}

.item-row label {
    font-size: 0.85rem;
    margin-bottom: 5px;
    display: block;
}

.remove-item {
    background: var(--secondary);
    color: white;
    border: none;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.remove-item:hover {
    background: #e04e6d;
}

.add-item {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

.add-item:hover {
    background: #2bb9c4;
}

/* Preview Styles */
.preview-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--primary);
}

.preview-header h2 {
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 5px;
}

.preview-details {
    margin-bottom: 30px;
}

.preview-section {
    margin-bottom: 15px;
}

.preview-section h3 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: var(--dark);
}

.preview-section p {
    white-space: pre-line;
    color: var(--gray);
}

.preview-items {
    margin-bottom: 20px;
}

.preview-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--light-gray);
}

.preview-totals {
    margin-bottom: 20px;
    border-top: 2px solid var(--primary);
    padding-top: 15px;
}

.preview-total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.preview-total-row.final {
    font-weight: 700;
    font-size: 1.1rem;
    border-top: 1px solid var(--light-gray);
    padding-top: 10px;
    margin-top: 10px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

/* Testimonials */
.testimonials {
    padding: 100px 0;
    background: white;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    border-left: 4px solid var(--primary);
}

.testimonial-content {
    font-style: italic;
    margin-bottom: 20px;
    color: var(--gray);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.author-info h4 {
    margin-bottom: 5px;
    color: var(--dark);
}

.author-info p {
    color: var(--gray);
    font-size: 0.9rem;
}

/* FAQ */
.faq {
    padding: 100px 0;
    background: var(--light-gray);
}

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

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(108, 99, 255, 0.05);
}

.faq-toggle {
    transition: var(--transition);
}

.faq-toggle.active {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.faq-answer.active {
    padding: 0 20px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--gray);
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h3 {
    margin-bottom: 20px;
    color: white;
    font-size: 1.2rem;
}

.footer-column p {
    color: #CBD5E0;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
}

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

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #CBD5E0;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #CBD5E0;
}

/* AdSense */
.adsense-container {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    margin: 40px 0;
    color: var(--gray);
}

/* Print Page Styles */
.print-page {
    display: none;
    padding: 40px;
    max-width: 800px;
    margin: 0 auto;
    background: white;
}

.print-notice {
    background: #FFF9E6;
    border-left: 4px solid var(--warning);
    padding: 15px;
    margin-bottom: 30px;
    border-radius: 4px;
}

.print-notice i {
    color: var(--warning);
    margin-right: 10px;
}

.print-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

/* Currency Selector */
.currency-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.currency-selector label {
    font-weight: 500;
    color: var(--dark);
}

.currency-selector select {
    padding: 8px 12px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    background: white;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .invoice-container {
        grid-template-columns: 1fr;
    }

    .invoice-preview {
        position: static;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        border-radius: 0 0 var(--border-radius) var(--border-radius);
    }

    nav ul.active {
        display: flex;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .item-row {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}