/* 
   Geek Cloud (极客云) CSS Style Sheet
   Technology-themed dark mode styling with glassmorphism and animations
*/

:root {
    --bg-color: #05060b;
    --card-bg: rgba(13, 17, 30, 0.7);
    --border-color: rgba(96, 165, 250, 0.2);
    --primary-color: #3b82f6;
    --secondary-color: #60a5fa;
    --accent-color: #10b981;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --glow-shadow: 0 0 15px rgba(59, 130, 246, 0.35);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

body {
    background-image: 
        linear-gradient(rgba(5, 6, 11, 0.88), rgba(5, 6, 11, 0.88)), 
        url('../images/tech_bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #070913;
}
::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Global Tech Background Grid Effect */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(18, 24, 48, 0.15) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(18, 24, 48, 0.15) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: -2;
    pointer-events: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.25;
}

/* Blue-White Gradient Font */
.gradient-text {
    background: linear-gradient(135deg, #ffffff 30%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

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

a:hover {
    color: #ffffff;
}

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

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(5, 6, 11, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
}

.logo-icon {
    width: 32px;
    height: 32px;
    fill: var(--primary-color);
    filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.6));
    animation: pulseGlow 3s infinite alternate;
}

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

.nav-link {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-link:hover {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(96, 165, 250, 0.5);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #2563eb);
    color: #ffffff;
    box-shadow: var(--glow-shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(59, 130, 246, 0.65);
    background: linear-gradient(135deg, #60a5fa, var(--primary-color));
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-glow {
    position: relative;
    overflow: hidden;
}

.btn-glow::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    transition: all 0.5s;
    opacity: 0;
}

.btn-glow:hover::after {
    left: 120%;
    transition: all 0.5s ease-in-out;
    opacity: 1;
}

/* Hero Section */
.hero {
    padding: 7rem 0 5rem 0;
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.live-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--border-color);
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.1);
}

.live-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 8px var(--accent-color);
    animation: blink 1.5s infinite;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

/* Features Grid */
.features {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
}

.section-desc {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--glow-shadow);
}

.feature-icon {
    width: 48px;
    height: 48px;
    fill: var(--primary-color);
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 6px rgba(59, 130, 246, 0.4));
}

.feature-card h3 {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
    color: #ffffff;
}

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

/* Pricing Section */
.pricing {
    padding: 5rem 0;
    position: relative;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    align-items: stretch;
}

.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    position: relative;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    box-shadow: var(--glow-shadow);
}

.pricing-card.popular::before {
    content: "最受欢迎";
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(135deg, var(--accent-color), #059669);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.plan-name {
    font-size: 1.5rem;
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.plan-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: baseline;
}

.plan-price span {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-left: 0.25rem;
}

.plan-features {
    list-style: none;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.check-icon {
    width: 18px;
    height: 18px;
    fill: var(--accent-color);
    flex-shrink: 0;
}

.pricing-card .btn {
    width: 100%;
}

/* User Reviews / Testimonials */
.testimonials {
    padding: 5rem 0;
}

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

.review-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 1.1rem;
}

.user-info h4 {
    color: #ffffff;
    font-size: 1rem;
}

.user-info span {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.star-rating {
    display: flex;
    gap: 0.15rem;
    color: #f59e0b;
    margin-top: 0.25rem;
}

.star-icon {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.review-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* FAQ Accordion */
.faq {
    padding: 5rem 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.02);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
}

.faq-item.active {
    border-color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.15);
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding: 0 1.5rem 1.5rem 1.5rem;
    transition: max-height 0.6s cubic-bezier(1, 0, 1, 0), padding 0.3s ease;
}

.chevron-icon {
    width: 20px;
    height: 20px;
    fill: var(--text-secondary);
    transition: var(--transition);
}

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

/* Articles section on landing page */
.articles-section {
    padding: 5rem 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--glow-shadow);
}

.article-banner {
    height: 140px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}

.article-banner::after {
    content: "";
}

.article-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    display: flex;
    gap: 1rem;
}

.article-title {
    font-size: 1.15rem;
    color: #ffffff;
    margin-bottom: 1rem;
    line-height: 1.4;
}

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

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more-btn {
    align-self: flex-start;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--secondary-color);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.read-more-btn:hover {
    color: #ffffff;
}

.arrow-right-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Article Template Styles */
.article-page {
    padding: 4rem 0 6rem 0;
}

.article-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

.article-category {
    background: rgba(59, 130, 246, 0.15);
    color: var(--secondary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.article-header h1 {
    font-size: 2.5rem;
    color: #ffffff;
    line-height: 1.25;
    margin-bottom: 1.25rem;
}

.article-header-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-primary);
}

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

.article-content h2 {
    font-size: 1.6rem;
    color: #ffffff;
    margin: 2.5rem 0 1rem 0;
}

.article-content h3 {
    font-size: 1.25rem;
    color: #ffffff;
    margin: 2rem 0 1rem 0;
}

.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

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

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.25rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    border-radius: 0 8px 8px 0;
}

/* Call To Action Box inside articles */
.article-cta {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
    border: 1px solid var(--primary-color);
    border-radius: 12px;
    padding: 2rem;
    margin: 3rem 0;
    text-align: center;
    box-shadow: var(--glow-shadow);
}

.article-cta h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: #ffffff;
}

.article-cta p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* Related articles at the end of article pages */
.related-articles {
    border-top: 1px solid var(--border-color);
    padding-top: 3rem;
    margin-top: 4rem;
}

.related-articles h3 {
    font-size: 1.5rem;
    color: #ffffff;
    margin-bottom: 2rem;
}

/* Floating back button */
.back-home-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-weight: 500;
}

.back-home-link svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
    transform: rotate(180deg);
}

/* Keywords highlighting tags */
.keyword-tag {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    color: var(--secondary-color);
    font-size: 0.95em;
}

/* Footer */
.footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    background: #030407;
    padding: 4rem 0 2rem 0;
    color: var(--text-secondary);
}

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

.footer-brand h3 {
    color: #ffffff;
    margin-bottom: 1rem;
}

.footer-brand p {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.footer-col h4 {
    color: #ffffff;
    font-size: 1rem;
    margin-bottom: 1.25rem;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

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

.footer-col a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    text-align: center;
    font-size: 0.85rem;
}

/* Keyframes and Animations */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@keyframes pulseGlow {
    0% {
        filter: drop-shadow(0 0 4px rgba(59, 130, 246, 0.4));
    }
    100% {
        filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.8));
    }
}

/* Mobile Responsive Adjustments */
@media (max-width: 968px) {
    .hero-title {
        font-size: 2.75rem;
    }
    
    .article-header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        max-width: 320px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .article-header h1 {
        font-size: 1.75rem;
    }
}