/* Base Variables & Design System */
:root {
    --primary: #4f46e5;
    --primary-glow: rgba(79, 70, 229, 0.15);
    --secondary: #06b6d4;
    --secondary-glow: rgba(6, 182, 212, 0.15);
    --accent: #8b5cf6;
    
    --bg-main: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-card-hover: rgba(255, 255, 255, 0.9);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --border-color: rgba(226, 232, 240, 0.8);
    --border-glow: rgba(79, 70, 229, 0.2);
    
    --shadow-sm: 0 2px 8px rgba(148, 163, 184, 0.05);
    --shadow-md: 0 10px 30px -10px rgba(148, 163, 184, 0.15);
    --shadow-lg: 0 20px 40px -15px rgba(148, 163, 184, 0.25);
    --shadow-glow: 0 0 25px rgba(79, 70, 229, 0.2);
    --shadow-glow-cyan: 0 0 25px rgba(6, 182, 212, 0.2);
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Global Resets */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    overflow-x: hidden;
}

body {
    min-height: 100vh;
    line-height: 1.6;
    color: var(--text-primary);
    position: relative;
}

/* Radiant Background Glow Blobs */
body::before {
    content: "";
    position: absolute;
    top: -10%;
    left: -10%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: -1;
    pointer-events: none;
    animation: floatBlob1 20s infinite alternate ease-in-out;
}

body::after {
    content: "";
    position: absolute;
    top: 40%;
    right: -10%;
    width: 70%;
    height: 70%;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: -1;
    pointer-events: none;
    animation: floatBlob2 25s infinite alternate ease-in-out;
}

.bottom-glow {
    position: absolute;
    bottom: -5%;
    left: 20%;
    width: 60%;
    height: 40%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

@keyframes floatBlob1 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 80px) scale(1.1); }
}

@keyframes floatBlob2 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-80px, -50px) scale(0.9); }
}

/* Typography & Links */
h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.85);
    box-shadow: var(--shadow-sm);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    box-shadow: 0 4px 10px var(--primary-glow);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.btn-register {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white !important;
    padding: 10px 24px;
    border-radius: 9999px;
    font-weight: 700;
    box-shadow: 0 4px 15px var(--primary-glow);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-normal);
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow), var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 10px 24px;
    border-radius: 9999px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-normal);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    background: none;
    border: none;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition-normal);
}

/* Hero Section */
.hero {
    padding: 160px 24px 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.1));
    border: 1px solid var(--border-glow);
    border-radius: 9999px;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #1e1b4b, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 40px auto;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
    padding: 30px;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.stat-item h3 {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-item p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

/* Features Section */
.features {
    padding: 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #0f172a, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--border-glow);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary-glow), var(--secondary-glow));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Pricing Section */
.pricing {
    padding: 100px 24px;
    background: linear-gradient(180deg, transparent, rgba(79, 70, 229, 0.02), transparent);
    position: relative;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    position: relative;
}

.pricing-card.popular {
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: scale(1.03);
}

.popular-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 4px 16px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    box-shadow: 0 4px 10px var(--primary-glow);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--primary);
}

.pricing-card.popular:hover {
    transform: translateY(-8px) scale(1.03);
}

.pricing-name {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.pricing-price {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
}

.pricing-price span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-left: 4px;
}

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

.pricing-features li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.pricing-features li svg {
    color: #10b981;
    flex-shrink: 0;
}

.btn-pricing {
    display: block;
    width: 100%;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 0.95rem;
    transition: var(--transition-normal);
}

.pricing-card.popular .btn-pricing {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.pricing-card.popular .btn-pricing:hover {
    box-shadow: 0 8px 25px var(--primary-glow), var(--shadow-glow);
}

.pricing-card:not(.popular) .btn-pricing:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Articles Section */
.articles-sec {
    padding: 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.article-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-cyan);
    border-color: var(--border-glow);
}

.article-cover {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-glow), var(--secondary-glow));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    position: relative;
}

.article-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.8));
}

.article-content {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    gap: 12px;
}

.article-title {
    font-size: 1.15rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-link {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.article-link:hover {
    color: var(--secondary);
}

/* User Reviews (Testimonials) */
.testimonials {
    padding: 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stars {
    color: #fbbf24;
    margin-bottom: 16px;
    display: flex;
    gap: 2px;
}

.testimonial-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-style: italic;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.username {
    font-weight: 700;
    font-size: 0.95rem;
}

.user-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* FAQ Section */
.faq {
    padding: 100px 24px;
    max-width: 800px;
    margin: 0 auto;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-item:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) ease-out;
}

.faq-answer-content {
    padding: 0 24px 20px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.faq-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
    color: var(--text-muted);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--primary);
}

/* Article Template Styles */
.article-page {
    padding: 120px 24px 100px 24px;
    max-width: 900px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 40px;
    text-align: center;
}

.article-header h1 {
    font-size: 2.8rem;
    margin-bottom: 16px;
    line-height: 1.2;
}

.article-meta-large {
    font-size: 0.95rem;
    color: var(--text-muted);
    display: flex;
    justify-content: center;
    gap: 24px;
}

.article-body {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
}

.article-body h2 {
    font-size: 1.8rem;
    margin: 40px 0 20px 0;
    color: var(--text-primary);
    border-left: 4px solid var(--primary);
    padding-left: 16px;
}

.article-body p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.article-body ul, .article-body ol {
    margin-bottom: 24px;
    padding-left: 24px;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body blockquote {
    border-left: 4px solid var(--secondary);
    padding: 16px 24px;
    background: var(--secondary-glow);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 32px 0;
    font-style: italic;
    color: var(--text-secondary);
}

.article-body a {
    color: var(--primary);
    font-weight: 700;
    text-decoration: underline;
}

.article-body a:hover {
    color: var(--secondary);
}

.article-keywords {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.keyword-tag {
    font-size: 0.8rem;
    padding: 4px 12px;
    background: var(--primary-glow);
    color: var(--primary);
    border-radius: 9999px;
    font-weight: 600;
}

/* Related articles inside article pages */
.related-articles {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
}

.related-articles h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
}

.related-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    list-style: none;
}

.related-item a {
    font-weight: 700;
    color: var(--text-primary);
}

.related-item a:hover {
    color: var(--primary);
}

.related-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Footer styling */
footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-card);
    padding: 60px 24px 30px 24px;
    position: relative;
    overflow: hidden;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 16px;
    max-width: 320px;
}

.footer-geo {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 16px;
    line-height: 1.4;
}

.footer-links h4 {
    font-size: 1.05rem;
    margin-bottom: 20px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .grid-3, .articles-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero h1 {
        font-size: 3.2rem;
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: white;
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 40px 24px;
        gap: 24px;
        transform: translateY(-150%);
        opacity: 0;
        pointer-events: none;
        transition: transform var(--transition-normal), opacity var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .hero h1 {
        font-size: 2.4rem;
    }
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3, .articles-grid, .testimonials-grid {
        grid-template-columns: 1fr;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        max-width: 320px;
        margin: 0 auto 40px auto;
    }
    .article-body {
        padding: 24px;
    }
    .related-list {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}