:root {
    --primary-blue: #00b5e5;
    --secondary-cyan: #00d2ff;
    --special-red: #ff4d4f;
    --text-dark: #333333;
    --text-gray: #666666;
    --bg-light: #ffffff;
    --bg-soft-blue: #f0faff;
    --card-border-blue: #00b5e5;
    --card-border-red: #ff4d4f;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

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

/* Header */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
}

.logo img {
    height: 40px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

nav ul li a:hover {
    color: var(--primary-blue);
}

.auth-buttons {
    display: flex;
    gap: 15px;
}

/* Buttons */
.btn {
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--secondary-cyan);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-blue);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-blue);
    color: var(--primary-blue);
}

.btn-outline:hover {
    background-color: var(--primary-blue);
    color: white;
}

.btn-outline-white {
    background-color: transparent;
    border: 2px solid white;
    color: white;
}

.btn-outline-white:hover {
    background-color: white;
    color: var(--primary-blue);
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 18px;
}

/* Pricing Buttons */
.btn-outline-red {
    background: transparent;
    border: 1px solid var(--special-red);
    color: var(--special-red);
}

.btn-outline-red:hover {
    background: var(--special-red);
    color: white;
}

.btn-outline-blue {
    background: transparent;
    border: 1px solid var(--primary-blue);
    color: var(--primary-blue);
}

.btn-outline-blue:hover {
    background: var(--primary-blue);
    color: white;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #00b5e5 0%, #00d2ff 100%);
    color: white;
    text-align: center;
    overflow: hidden;
}

#dynamic-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Sections General */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.section-title p {
    color: var(--text-gray);
    font-size: 18px;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card .icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.price-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.price-card.special {
    border: 1px solid var(--card-border-red);
}

.price-card:not(.special) {
    border: 1px solid var(--card-border-blue);
}

.price-card:hover {
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.card-header h3 {
    font-size: 20px;
    text-align: center;
    margin-bottom: 15px;
}

.price-card.special .card-header h3 {
    color: var(--special-red);
}

.price-card:not(.special) .card-header h3 {
    color: var(--text-dark);
}

.price {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 25px;
}

.price-card.special .price {
    color: var(--special-red);
}

.price-card:not(.special) .price {
    color: var(--primary-blue);
}

.price span {
    font-size: 16px;
    font-weight: 400;
}

.features-list {
    list-style: none;
    margin-bottom: 30px;
    flex-grow: 1;
}

.features-list li {
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
    font-size: 14px;
    color: var(--text-gray);
}

.features-list li:last-child {
    border-bottom: none;
}

.features-list li strong {
    color: var(--text-dark);
}

/* Reviews */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.review-card {
    background: var(--bg-soft-blue);
    padding: 30px;
    border-radius: 12px;
    position: relative;
}

.review-card .content {
    font-style: italic;
    margin-bottom: 20px;
}

.review-card .author {
    font-weight: 700;
    text-align: right;
}

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

.faq-item {
    margin-bottom: 30px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.faq-item h3 {
    margin-bottom: 10px;
    color: var(--primary-blue);
}

/* Footer */
footer {
    background: #002d40;
    color: white;
    padding: 60px 0 20px;
}

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

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

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
}

.seo-keywords {
    margin-top: 20px;
    font-size: 12px;
    color: rgba(255,255,255,0.5);
    line-height: 2;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        height: auto;
        padding: 20px;
    }
    nav ul {
        margin: 20px 0;
        gap: 15px;
    }
    .hero h1 {
        font-size: 32px;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
    }
}

/* Article Styles */
.article-page {
    padding-top: 120px;
    background: #fdfdfd;
}

.article-container {
    max-width: 900px;
    margin: 40px auto;
    background: white;
    padding: 60px;
    border-radius: 20px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.03);
}

.article-header h1 {
    font-size: 42px;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.article-meta {
    color: var(--text-gray);
    margin-bottom: 40px;
    display: flex;
    gap: 20px;
    font-size: 14px;
}

.article-content h2 {
    font-size: 28px;
    margin: 40px 0 20px;
    color: var(--primary-blue);
}

.article-content h3 {
    font-size: 22px;
    margin: 30px 0 15px;
}

.article-content p {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 25px;
    color: #444;
}

.article-content ul, .article-content ol {
    margin-bottom: 25px;
    padding-left: 20px;
}

.article-content li {
    margin-bottom: 10px;
    font-size: 17px;
}

.internal-links {
    background: var(--bg-soft-blue);
    padding: 30px;
    border-radius: 12px;
    margin: 50px 0;
}

.internal-links h4 {
    margin-bottom: 15px;
}

.article-footer {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid #eee;
    text-align: center;
}

.back-to-home {
    display: inline-block;
    margin-top: 20px;
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
}