@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --primary-color: #0A2540;
    --accent-color: #00D084;
    --accent-hover: #00B370;
    --bg-color: #F7F9FC;
    --white: #FFFFFF;
    --text-main: #333333;
    --text-muted: #6B7280;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-top: 2rem; }
h3 { font-size: 1.5rem; margin-top: 1.5rem; }

p { margin-bottom: 1rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

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

ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

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

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

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-main);
    font-size: 1rem;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.header-btn {
    background-color: var(--accent-color);
    color: var(--white) !important;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    transition: background-color 0.2s;
}

.header-btn:hover {
    background-color: var(--accent-hover);
}

/* Hero Section */
.hero {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    color: var(--white);
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 1.25rem;
    color: #E2E8F0;
    max-width: 600px;
    margin: 0 auto 2rem auto;
}

.btn-primary {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white) !important;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    transition: all 0.2s;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Content Area */
.content-section {
    padding: 4rem 0;
    background-color: var(--white);
}

.content-section:nth-child(even) {
    background-color: var(--bg-color);
}

.seo-content {
    max-width: 800px;
    margin: 0 auto;
}

.seo-content h2, .seo-content h3 {
    margin-top: 2.5rem;
}

.seo-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 2rem 0;
}

.seo-content .table-wrapper {
    overflow-x: auto;
    margin: 2rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--bg-color);
    font-weight: 600;
    color: var(--primary-color);
}

/* Features List */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.feature-card h3 {
    margin-top: 0;
    font-size: 1.25rem;
}

/* FAQ Accordion */
.faq-list {
    margin: 3rem 0;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: 1.5rem;
    background: var(--white);
    border: none;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
    font-family: inherit;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 1.5rem 1.5rem 1.5rem;
    background: var(--white);
    display: none;
}

.faq-question.active + .faq-answer {
    display: block;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: #cbd5e1;
    padding: 4rem 0 2rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

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

.footer ul li {
    margin-bottom: 0.75rem;
}

.footer a {
    color: #cbd5e1;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links, .header-btn {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}

/* Adaptive Mobile Layout (added by script) */
@media (max-width: 768px) {
    body { overflow-x: hidden !important; }
    .container { width: 100% !important; padding: 0 15px !important; margin: 0 auto !important; box-sizing: border-box !important; }
    
    /* Header */
    .header { position: relative !important; height: auto !important; padding: 10px 0 !important; }
    .header-inner { flex-direction: column !important; text-align: center !important; gap: 15px !important; padding: 10px 0 !important; }
    .nav-links { display: flex !important; flex-wrap: wrap !important; width: 100% !important; justify-content: center !important; flex-direction: row !important; gap: 8px !important; padding: 10px 0 !important; }
    .nav-links a { font-size: 15px !important; margin: 0 !important; padding: 8px 12px !important; display: inline-block !important; border: 1px solid rgba(0,0,0,0.1) !important; border-radius: 4px; }
    .header-btn { display: inline-block !important; width: 100% !important; margin: 10px 0 0 0 !important; box-sizing: border-box !important; }
    .mobile-menu-btn { display: none !important; }
    
    /* Hero */
    .hero, .calculator-info { padding: 40px 15px !important; text-align: center !important; min-height: auto !important; }
    h1, .hero h1, .calculator-info h1 { font-size: 24px !important; line-height: 1.3 !important; word-wrap: break-word !important; overflow-wrap: break-word !important; hyphens: auto !important; }
    h2, .hero h2, .calculator-info h2 { font-size: 20px !important; word-wrap: break-word !important; margin-top: 20px !important; }
    h3 { font-size: 18px !important; }
    
    /* Main */
    main { padding: 20px 0 !important; width: 100vw !important; max-width: 100% !important; box-sizing: border-box !important; }
    main img, .content-card img { max-width: 100% !important; height: auto !important; margin: 15px auto !important; display: block !important; border-radius: 4px !important; }
    main table, main thead, main tbody, main th, main td, main tr, .table-container { display: block !important; width: 100% !important; box-sizing: border-box !important; overflow-x: auto !important; }
    
    /* Footer */
    .footer-grid, .footer-top, .footer-bottom { display: flex !important; flex-direction: column !important; gap: 20px !important; text-align: center !important; }
    .footer-grid ul, .footer-links-group ul, .footer-contact ul { padding: 0 !important; list-style: none !important; }
    .footer-links { flex-direction: column !important; gap: 10px !important; }
    
    /* Lists */
    .features-grid, .services-grid, .articles-grid, .advantages-grid { display: flex !important; flex-direction: column !important; gap: 20px !important; }
}