:root {
    /* Color Palette - Premium Blue & Gold Theme */
    --primary-color: #0d253f;
    /* Deep Navy */
    --primary-light: #1a4b7c;
    --accent-color: #d4a017;
    /* Metallic Gold */
    --accent-hover: #b8860b;
    --text-dark: #1a1a1a;
    --text-light: #f5f5f5;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

    /* Typography */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

/* Header & Navigation */
header {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-light);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span {
    color: var(--accent-color);
}

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

.main-nav a {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--text-light);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2a3c54 100%);
    color: var(--text-light);
    padding: 4rem 20px 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero h1 {
    color: var(--text-light);
    font-size: 3rem;
    margin-bottom: 1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin: 0 auto;
}

/* Calculator Container */
.calculator-wrapper {
    max-width: 1000px;
    margin: -4rem auto 3rem;
    padding: 0 20px;
    position: relative;
    z-index: 10;
}

.calculator-card {
    background: var(--bg-white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    overflow: hidden;
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: 2px solid #e0e0e0;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-heading);
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-light);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select,
input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-body);
    transition: all 0.2s;
    background-color: #fff;
}

select:focus,
input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(13, 37, 63, 0.1);
}

.action-btn {
    width: 100%;
    padding: 1rem;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.3s, transform 0.1s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.action-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* Results */
.result-box {
    background: linear-gradient(135deg, #f8faff 0%, #e6f0fa 100%);
    border: 1px solid #dbeafe;
    border-radius: 12px;
    padding: 2rem;
    margin-top: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.result-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-color);
}

.result-amount {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 0.5rem 0;
    line-height: 1;
}

.result-label {
    color: #64748b;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Comparison Grid */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.compare-card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid #eee;
}

.compare-card h4 {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* Content Sections */
.section {
    max-width: 1000px;
    margin: 3rem auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
}

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

.feature-card {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s;
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.footer-col h3 {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

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

.footer-col li {
    margin-bottom: 0.8rem;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.2s;
}

.footer-col a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
    }

    .hamburger {
        display: block;
    }

    .main-nav {
        display: none;
        width: 100%;
        margin-top: 1rem;
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
        background: rgba(255, 255, 255, 0.1);
        padding: 1rem;
        border-radius: 8px;
    }

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

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

/* Content & Blog Styles */
.content-wrapper {
    background: #fff;
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    max-width: 900px;
    margin: 0 auto;
}

.article-content {
    line-height: 1.8;
    color: #333;
    font-size: 1.05rem;
}

.article-content h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.article-content h3 {
    font-size: 1.5rem;
    color: var(--primary-light);
    margin-top: 2rem;
    margin-bottom: 0.8rem;
}

.article-content p {
    margin-bottom: 1.5rem;
}

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

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

.table-container {
    overflow-x: auto;
    margin: 2rem 0;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.modern-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

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

.modern-table td {
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

.modern-table tr:last-child td {
    border-bottom: none;
}

.toc-box {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 3rem;
    border-left: 4px solid var(--accent-color);
}

.toc-box h3 {
    margin-top: 0;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.toc-box ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-box li {
    margin-bottom: 0.5rem;
}

.toc-box a {
    text-decoration: none;
    font-weight: 500;
}

.toc-box a:hover {
    text-decoration: underline;
}

/* Blog Index Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.blog-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s, box-shadow 0.3s;
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.blog-img {
    height: 200px;
    background-color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.2);
    font-size: 3rem;
}

.blog-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.blog-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.blog-excerpt {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.read-more {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    align-self: flex-start;
}