:root {
    --bg-color: #ffffff;
    --text-primary: #001a3d;
    --text-secondary: #4a5568;
    --accent-color: #004aad;
    --accent-hover: #003580;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --shadow: 0 10px 30px rgba(0, 26, 61, 0.08);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 80px 0;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

/* Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-color);
}

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

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

/* Hero Section */
.hero {
    padding-top: 160px;
    padding-bottom: 100px;
    text-align: center;
    background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 74, 173, 0.2);
    color: #fff;
}

/* Pricing Cards */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.price-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.price-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
    border-color: var(--accent-color);
}

.price-card.recommended {
    border: 2px solid var(--accent-color);
    transform: scale(1.05);
}

.price-card.recommended:hover {
    transform: scale(1.05) translateY(-10px);
}

.badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--accent-color);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
}

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

.price-card .price {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.price-card .price span {
    font-size: 1rem;
    color: var(--text-secondary);
}

.price-card .limit {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.price-features {
    text-align: left;
    margin-bottom: 2rem;
}

.price-features li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.price-features li::before {
    content: "✓";
    color: var(--accent-color);
    font-weight: 900;
}

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

.testimonial-item {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 15px;
}

.testimonial-item p {
    font-style: italic;
    margin-bottom: 1.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 50px;
    height: 50px;
    background: #e2e8f0;
    border-radius: 50%;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
}

.faq-question {
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.faq-answer {
    margin-top: 1rem;
    color: var(--text-secondary);
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* Footer */
footer {
    background: #001a3d;
    color: #fff;
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 40px;
}

.footer-col h4 {
    margin-bottom: 1.5rem;
}

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

.footer-col ul li a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: #cbd5e0;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    .nav-links { display: none; }
}

/* SEO Article Styles */
.article-container {
    max-width: 900px;
    margin: 120px auto;
    padding: 0 2rem;
}

.article-header {
    margin-bottom: 3rem;
    text-align: center;
}

.article-content {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.article-content h2 {
    text-align: left;
    margin: 2rem 0 1rem;
    font-size: 1.8rem;
    color: var(--text-primary);
}

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

.internal-links {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}