/* Accounting Helper - Professional Design */
:root {
    --primary: #1e3a5f;
    --secondary: #2d5a87;
    --accent: #4a90d9;
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
    --light: #f8f9fa;
    --dark: #2c3e50;
    --gray: #6c757d;
    --border: #dee2e6;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
}

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

/* Header */
.site-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.8rem;
}

.main-nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.main-nav a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s;
    font-size: 0.95rem;
}

.main-nav a:hover, .main-nav a.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

/* Dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-content {
    display: none;
    position: absolute;
    background: white;
    min-width: 200px;
    top: 100%;
    left: 0;
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
    border-radius: 8px;
    overflow: hidden;
    z-index: 1001;
}

.nav-dropdown:hover .nav-dropdown-content {
    display: block;
}

.nav-dropdown-content a {
    color: var(--dark) !important;
    padding: 0.75rem 1rem;
    display: block;
    border-bottom: 1px solid var(--border);
}

.nav-dropdown-content a:hover {
    background: var(--light);
}

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

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto 2rem;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: 0.5rem;
}

.search-box input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
}

.search-box button {
    padding: 1rem 2rem;
    background: var(--success);
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.2s;
}

.search-box button:hover {
    transform: scale(1.05);
}

/* Section Titles */
.section-title {
    text-align: center;
    margin: 3rem 0 2rem;
    color: var(--primary);
}

.section-title h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.section-title p {
    color: var(--gray);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.tool-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    transition: all 0.3s;
    border: 1px solid var(--border);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.tool-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.tool-card h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.tool-card p {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.tool-link {
    display: inline-block;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.tool-link:hover {
    text-decoration: underline;
}

/* Articles */
.articles-section {
    background: white;
    padding: 3rem 0;
}

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

.article-card {
    background: var(--light);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s;
    border: 1px solid var(--border);
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.article-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.article-content {
    padding: 1.5rem;
}

.article-category {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    margin-bottom: 0.75rem;
}

.article-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.article-card h3 a {
    color: inherit;
    text-decoration: none;
}

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

.article-card p {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.read-more {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Article Page */
.article-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 20px;
}

.article-header {
    margin-bottom: 2rem;
}

.article-header h1 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-meta {
    color: var(--gray);
    font-size: 0.9rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.article-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--dark);
}

.article-body h2 {
    color: var(--primary);
    margin: 2rem 0 1rem;
    font-size: 1.5rem;
}

.article-body h3 {
    color: var(--secondary);
    margin: 1.5rem 0 0.75rem;
    font-size: 1.25rem;
}

.article-body p {
    margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

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

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.article-body th, .article-body td {
    border: 1px solid var(--border);
    padding: 0.75rem;
    text-align: left;
}

.article-body th {
    background: var(--primary);
    color: white;
}

.article-body blockquote {
    border-left: 4px solid var(--accent);
    padding: 1rem 1.5rem;
    background: var(--light);
    margin: 1.5rem 0;
    font-style: italic;
}

/* Related Articles */
.related-articles {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border);
}

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

.related-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.related-item {
    background: var(--light);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.related-item a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.related-item a:hover {
    text-decoration: underline;
}

/* Page Content */
.page-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 20px;
}

.page-content h1 {
    color: var(--primary);
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
}

.page-content h2 {
    color: var(--secondary);
    margin: 2rem 0 1rem;
    font-size: 1.5rem;
}

.page-content p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.page-content ul, .page-content ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

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

/* Contact Form */
.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    max-width: 600px;
    margin: 2rem auto;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary);
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.btn-primary {
    background: var(--accent);
    color: white;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background 0.3s;
}

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

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary);
    margin-bottom: 0.75rem;
}

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

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

.footer-col h4 {
    color: var(--accent);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

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

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

.footer-col a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

/* Breadcrumb */
.breadcrumb {
    padding: 1rem 0;
    font-size: 0.9rem;
    color: var(--gray);
}

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

.breadcrumb span {
    margin: 0 0.5rem;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 2rem 0;
}

.pagination a, .pagination span {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 5px;
    text-decoration: none;
    color: var(--dark);
}

.pagination a:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.pagination .active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Internal Links */
.internal-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dotted var(--accent);
}

.internal-link:hover {
    border-bottom-style: solid;
}

/* Callout Box */
.callout {
    background: linear-gradient(135deg, rgba(74,144,217,0.1), rgba(30,58,95,0.1));
    border-left: 4px solid var(--accent);
    padding: 1.5rem;
    border-radius: 0 8px 8px 0;
    margin: 1.5rem 0;
}

.callout h4 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
    }
    
    .main-nav {
        width: 100%;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .search-box button {
        width: 100%;
    }
    
    .tools-grid, .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 1.5rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .article-header h1 {
        font-size: 1.5rem;
    }
}

/* Tool Detail Page */
.tool-detail {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    margin: 2rem 0;
}

.tool-header {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border);
}

.tool-header .tool-icon {
    width: 80px;
    height: 80px;
    font-size: 2.5rem;
}

.tool-info h1 {
    color: var(--primary);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.tool-category {
    display: inline-block;
    background: var(--light);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--gray);
}

/* Ad Placeholder */
.ad-placeholder {
    background: linear-gradient(135deg, #f0f0f0, #e0e0e0);
    border: 2px dashed #ccc;
    padding: 2rem;
    text-align: center;
    color: #999;
    border-radius: 8px;
    margin: 2rem 0;
}

.ad-placeholder ins {
    display: block;
}