:root {
    --primary-color: #ff6b9d;
    --secondary-color: #4ecdc4;
    --accent-color: #ffe66d;
    --text-dark: #2c3e50;
    --text-light: #ecf0f1;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e9ecef;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

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

/* GDPR Notice */
.gdpr-notice {
    position: fixed;
    bottom: 20px;
    left: 20px;
    background: var(--text-dark);
    color: var(--text-light);
    padding: 15px 20px;
    border-radius: var(--border-radius);
    z-index: 1000;
    max-width: 400px;
    box-shadow: var(--shadow);
    animation: slideIn 0.5s ease-out;
}

.gdpr-notice p {
    margin-bottom: 10px;
    font-size: 14px;
}

.gdpr-notice a {
    color: var(--accent-color);
    text-decoration: none;
}

.gdpr-notice button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.gdpr-notice button:hover {
    background: #e55a87;
}

.gdpr-notice.hidden {
    display: none;
}

/* Navigation */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 999;
}

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

.logo h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
}

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

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

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.calculator-container {
    max-width: 500px;
    margin: 0 auto;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.calculator {
    background: var(--bg-white);
    color: var(--text-dark);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.calculator h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.result {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 1rem;
    animation: fadeIn 0.5s ease-out;
}

.result h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.result p {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-top: 70px;
}

.breadcrumb {
    list-style: none;
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}

.breadcrumb li {
    margin-right: 0.5rem;
}

.breadcrumb li:not(:last-child)::after {
    content: '>';
    margin-left: 0.5rem;
    color: #666;
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb li:last-child {
    color: #666;
}

/* Main Content */
.main-content {
    padding: 60px 0;
}

.article-content {
    background: var(--bg-white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
}

.article-content h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 2.5rem;
}

.article-content h3 {
    color: var(--text-dark);
    margin: 2rem 0 1rem;
    font-size: 1.8rem;
}

.article-content h4 {
    color: var(--text-dark);
    margin: 1.5rem 0 1rem;
    font-size: 1.3rem;
}

.article-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    text-align: justify;
}

.article-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.article-content a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.article-content ul, .article-content ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content strong {
    color: var(--primary-color);
}

.article-content mark {
    background: var(--accent-color);
    padding: 2px 6px;
    border-radius: 4px;
}

.article-content blockquote {
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.conversion-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.conversion-table th {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.conversion-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.conversion-table tr:nth-child(even) {
    background: var(--bg-light);
}

.conversion-table tr.highlight {
    background: rgba(255, 107, 157, 0.1);
    font-weight: 600;
}

/* Articles Section */
.articles-section {
    margin-top: 3rem;
}

.articles-section h2 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 2.5rem;
    text-align: center;
}

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

.article-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.article-card h3 {
    margin-bottom: 1rem;
}

.article-card h3 a {
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition);
}

.article-card h3 a:hover {
    color: var(--primary-color);
}

.article-card p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--text-light);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

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

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

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #444;
    color: #aaa;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #e55a87;
    transform: translateY(-2px);
}

/* Animations - optimized for performance */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 30px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes slideIn {
    from {
        transform: translate3d(-100%, 0, 0);
    }
    to {
        transform: translate3d(0, 0, 0);
    }
}

/* Performance optimizations */
.article-card,
.calculator,
.nav-menu,
.back-to-top {
    will-change: auto;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

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

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

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

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

    .calculator {
        margin: 0 1rem;
        padding: 1.5rem;
    }

    .article-content {
        padding: 2rem;
        margin: 0 1rem;
    }

    .article-content h2 {
        font-size: 2rem;
    }

    .article-content h3 {
        font-size: 1.5rem;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin: 0 1rem;
    }

    .conversion-table {
        font-size: 0.9rem;
    }

    .conversion-table th,
    .conversion-table td {
        padding: 0.5rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .calculator {
        margin: 0 0.5rem;
        padding: 1rem;
    }

    .article-content {
        padding: 1.5rem;
        margin: 0 0.5rem;
    }

    .articles-grid {
        margin: 0 0.5rem;
    }
}