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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8fafc;
}

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

/* Navigation */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #2563eb;
    font-weight: 700;
    font-size: 1.5rem;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0 40px;
    text-align: center;
}

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

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Calculator Section */
.calculator-section {
    padding: 40px 0;
    background: white;
}

.calculator-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.calculator-form {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.calculator-form h2 {
    color: #1e293b;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    font-weight: 600;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #374151;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix {
    position: absolute;
    left: 12px;
    color: #6b7280;
    font-weight: 500;
    z-index: 1;
}

.input-suffix {
    position: absolute;
    right: 12px;
    color: #6b7280;
    font-weight: 500;
    z-index: 1;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input[type="number"] {
    padding-left: 40px;
    padding-right: 40px;
}

.calculate-btn {
    width: 100%;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    border: none;
    padding: 16px 24px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.calculate-btn:active {
    transform: translateY(0);
}

/* Calculator Results */
.calculator-results {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid #e5e7eb;
    position: relative;
    overflow: hidden;
}

.calculator-results::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #2563eb, #1d4ed8, #3b82f6);
}

.calculator-results h3 {
    color: #1e293b;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.results-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.advanced-results {
    margin-top: 1rem;
    padding: 1rem;
    background: #f0f9ff;
    border-radius: 8px;
    border-left: 4px solid #2563eb;
}

.advanced-results h4 {
    color: #1e40af;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.result-item {
    background: #f8fafc;
    padding: 0.5rem;
    border-radius: 8px;
    text-align: center;
}

.result-label {
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 0.25rem;
}

.result-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1e293b;
}

.chart-container {
    margin: 0.5rem 0;
    height: 150px;
}

.additional-info {
    background: #fef3c7;
    padding: 0.5rem;
    border-radius: 8px;
    border-left: 4px solid #f59e0b;
    margin-top: 0.25rem;
}

.additional-info h4 {
    color: #92400e;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.additional-info ul {
    list-style: none;
    padding: 0;
}

.additional-info li {
    color: #92400e;
    margin-bottom: 0.25rem;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9rem;
}

.additional-info li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #f59e0b;
    font-weight: bold;
}

/* Features Section */
.features-section {
    padding: 60px 0;
    background: #f8fafc;
}

.features-section .hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
}

.features-section .stat {
    text-align: center;
}

.features-section .stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #2563eb;
}

.features-section .stat-label {
    font-size: 0.9rem;
    color: #6b7280;
}

.features-section h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #1e293b;
    font-weight: 600;
}

.feature-card p {
    color: #6b7280;
    line-height: 1.6;
}

/* Blog Section */
.blog-section {
    padding: 80px 0;
    background: white;
}

.blog-section h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.blog-image {
    height: 200px;
    overflow: hidden;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.blog-card:hover .blog-image img {
    transform: scale(1.05);
}

.blog-content {
    padding: 1.5rem;
}

.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.blog-date {
    color: #6b7280;
}

.blog-category {
    color: #2563eb;
    font-weight: 500;
}

.blog-content h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
}

.blog-content h3 a {
    color: #1e293b;
    text-decoration: none;
    transition: color 0.3s ease;
}

.blog-content h3 a:hover {
    color: #2563eb;
}

.blog-content p {
    color: #6b7280;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.read-more {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #1d4ed8;
}

/* About Section */
.about-section {
    padding: 80px 0;
    background: #f8fafc;
}

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

.about-content h2 {
    margin-bottom: 2rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
}

.about-content p {
    font-size: 1.1rem;
    color: #6b7280;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.about-features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #059669;
    font-weight: 500;
}

.about-feature i {
    font-size: 1.2rem;
}

/* Contact Section */
.contact-section {
    padding: 80px 0;
    background: white;
    text-align: center;
}

.contact-section h2 {
    margin-bottom: 1rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
}

.contact-section p {
    font-size: 1.1rem;
    color: #6b7280;
    margin-bottom: 3rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #374151;
    font-weight: 500;
}

.contact-item i {
    color: #2563eb;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section p {
    color: #94a3b8;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #94a3b8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .hero {
        padding: 80px 0 20px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .calculator-section {
        padding: 20px 0;
    }

    .features-section .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .calculator-wrapper {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .results-container {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .blog-grid {
        grid-template-columns: 1fr;
    }

    .about-features {
        flex-direction: column;
        gap: 1rem;
    }

    .contact-info {
        flex-direction: column;
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .calculator-form,
    .calculator-results {
        padding: 1.5rem;
    }

    .features-section,
    .blog-section,
    .about-section,
    .contact-section {
        padding: 60px 0;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #2563eb;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Print Styles */
@media print {
    .navbar,
    .hero,
    .features-section,
    .blog-section,
    .about-section,
    .contact-section,
    .footer {
        display: none;
    }

    .calculator-section {
        padding: 0;
    }

    .calculator-wrapper {
        grid-template-columns: 1fr;
    }
}