/* 迅达云官网 Premium Style Document */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Palette */
    --bg-dark: #080516;
    --bg-card: rgba(18, 14, 45, 0.6);
    --bg-card-hover: rgba(28, 22, 66, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(139, 92, 246, 0.4);
    
    --primary-gradient: linear-gradient(135deg, #7C3AED 0%, #3B82F6 100%);
    --accent-gradient: linear-gradient(135deg, #06B6D4 0%, #8B5CF6 100%);
    --glow-gradient: linear-gradient(135deg, rgba(124, 58, 237, 0.5) 0%, rgba(59, 130, 246, 0.5) 100%);
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --neon-blue: #06B6D4;
    --neon-purple: #a855f7;
    --neon-green: #10B981;
    --neon-red: #EF4444;
    --neon-orange: #F59E0B;
    
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.2s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-dark);
}

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

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #080516;
}
::-webkit-scrollbar-thumb {
    background: #251B4F;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #3E2B88;
}

/* Background Animations and Grid Decor */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
    z-index: -2;
    pointer-events: none;
}

.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(255, 255, 255, 0.007) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255, 255, 255, 0.007) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -2;
    pointer-events: none;
    opacity: 0.8;
}

/* Particle Canvas Background */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Glowing Floating Spheres */
.glow-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.45;
    pointer-events: none;
}

.sphere-1 {
    width: 300px;
    height: 300px;
    background: var(--neon-purple);
    top: 15%;
    right: 10%;
    animation: floatSphere 15s infinite alternate ease-in-out;
}

.sphere-2 {
    width: 400px;
    height: 400px;
    background: var(--neon-blue);
    top: 55%;
    left: 5%;
    animation: floatSphere 20s infinite alternate-reverse ease-in-out;
}

@keyframes floatSphere {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 40px) scale(1.1); }
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography and Section Headers */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.text-gradient {
    background: linear-gradient(135deg, #A78BFA 0%, #60A5FA 50%, #34D399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    background: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.2);
    color: #C084FC;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-title-wrap {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px auto;
}

.section-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 16px;
}

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

/* Glassmorphism Styles */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition-smooth);
}

.glass-panel:hover {
    border-color: var(--border-hover);
    box-shadow: 0 10px 30px -10px rgba(124, 58, 237, 0.15);
    background: var(--bg-card-hover);
}

/* Navigation Menu */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(8, 5, 22, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.navbar.scrolled {
    padding: 12px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

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

.navbar.scrolled .container {
    height: 65px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--primary-gradient);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(124, 58, 237, 0.4);
}

.logo-text {
    font-family: var(--font-heading);
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #FFFFFF 0%, #C084FC 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    padding: 8px 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: 30px;
    font-family: var(--font-heading);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    font-size: 0.95rem;
    gap: 8px;
    border: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #FFFFFF;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(124, 58, 237, 0.5);
    background: linear-gradient(135deg, #8B5CF6 0%, #3B82F6 100%);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.8rem;
    cursor: pointer;
}

/* Hero Section */
.hero-section {
    padding: 160px 0 100px 0;
    position: relative;
}

.hero-wrapper {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 620px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.2);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--neon-blue);
    margin-bottom: 24px;
}

.hero-badge-pulse {
    width: 8px;
    height: 8px;
    background: var(--neon-blue);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 8px var(--neon-blue);
    animation: pulseGlow 1.5s infinite;
}

@keyframes pulseGlow {
    0% { transform: scale(0.9); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.5; }
}

.hero-title {
    font-size: 3.8rem;
    line-height: 1.15;
    margin-bottom: 24px;
    font-weight: 800;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    border-top: 1px solid var(--border-color);
    padding-top: 32px;
}

.stat-item h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Hero Interactive Card */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-glow-glow {
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 60%);
    filter: blur(40px);
    z-index: -1;
}

.network-globe-card {
    width: 100%;
    padding: 30px;
    position: relative;
    overflow: hidden;
}

.globe-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.globe-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 600;
}

.globe-title i {
    color: var(--neon-purple);
}

.active-users-count {
    font-size: 0.85rem;
    color: var(--neon-green);
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 4px 10px;
    border-radius: 12px;
}

.globe-simulation {
    height: 220px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 20px;
    position: relative;
    overflow: hidden;
}

.globe-radar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 1px solid rgba(6, 182, 212, 0.3);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: radarSpin 4s linear infinite;
}

.globe-radar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(from 0deg, rgba(6, 182, 212, 0.15) 0deg, transparent 180deg);
}

.globe-radar-center {
    width: 12px;
    height: 12px;
    background: var(--neon-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--neon-blue);
}

@keyframes radarSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.globe-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    width: 100%;
    margin-top: 20px;
}

.globe-stat-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 10px;
    text-align: center;
}

.globe-stat-val {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.globe-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Core Advantages Section */
.features-section {
    padding: 100px 0;
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 35px 25px;
    text-align: left;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.feature-icon-wrap {
    width: 54px;
    height: 54px;
    border-radius: 12px;
    background: rgba(124, 58, 237, 0.08);
    border: 1px solid rgba(124, 58, 237, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--neon-purple);
    font-size: 1.5rem;
    box-shadow: inset 0 0 10px rgba(124, 58, 237, 0.05);
}

.feature-card:nth-child(2) .feature-icon-wrap {
    color: var(--neon-blue);
    background: rgba(6, 182, 212, 0.08);
    border-color: rgba(6, 182, 212, 0.15);
}

.feature-card:nth-child(3) .feature-icon-wrap {
    color: var(--neon-green);
    background: rgba(16, 185, 129, 0.08);
    border-color: rgba(16, 185, 129, 0.15);
}

.feature-card:nth-child(4) .feature-icon-wrap {
    color: var(--neon-orange);
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.15);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
}

/* Nodes Board Section */
.nodes-section {
    padding: 100px 0;
    position: relative;
}

.nodes-board {
    padding: 40px;
    width: 100%;
}

.nodes-board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
    margin-bottom: 30px;
}

.nodes-subtitle {
    font-size: 1.15rem;
    font-weight: 600;
}

.nodes-subtitle span {
    color: var(--neon-green);
}

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.node-card {
    padding: 20px;
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-smooth);
}

.node-card:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(6, 182, 212, 0.3);
    transform: translateY(-2px);
}

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

.node-flag {
    font-size: 1.5rem;
}

.node-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 2px;
}

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

.node-status-area {
    text-align: right;
}

.node-status {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--neon-green);
    margin-bottom: 4px;
}

.node-status-dot {
    width: 6px;
    height: 6px;
    background-color: var(--neon-green);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 6px var(--neon-green);
}

.node-latency {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    padding: 2px 8px;
    border-radius: 4px;
    display: inline-block;
}

.node-latency.excellent {
    color: var(--neon-green);
}

.node-latency.good {
    color: var(--neon-blue);
}

.node-latency.normal {
    color: var(--neon-orange);
}

.node-latency.testing {
    color: var(--text-muted);
    animation: pulseTesting 1s infinite alternate;
}

@keyframes pulseTesting {
    0% { opacity: 0.4; }
    100% { opacity: 1; }
}

.nodes-board-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.01);
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.nodes-footer-tips {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nodes-footer-tips i {
    color: var(--neon-blue);
}

/* Pricing Section */
.pricing-section {
    padding: 100px 0;
    position: relative;
}

.pricing-toggle-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 50px;
}

.toggle-label {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.toggle-label.active {
    color: var(--text-primary);
}

.pricing-toggle {
    position: relative;
    width: 60px;
    height: 30px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.pricing-toggle-btn {
    position: absolute;
    top: 3px;
    left: 4px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary-gradient);
    transition: var(--transition-smooth);
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.4);
}

.pricing-toggle.yearly .pricing-toggle-btn {
    left: 32px;
}

.yearly-discount-badge {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    color: #FFFFFF;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 20px;
    margin-left: 5px;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.3);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    align-items: stretch;
}

.pricing-card {
    padding: 40px 30px;
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.pricing-card.featured {
    border-color: var(--neon-purple);
    background: linear-gradient(180deg, rgba(27, 22, 59, 0.6) 0%, rgba(18, 14, 45, 0.8) 100%);
    box-shadow: 0 15px 35px -10px rgba(124, 58, 237, 0.25);
}

.pricing-card.featured::before {
    content: 'HOT/推荐';
    position: absolute;
    top: -12px;
    right: 25px;
    background: var(--primary-gradient);
    color: #FFFFFF;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}

.plan-name {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.plan-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 25px;
}

.plan-price-wrap {
    display: flex;
    align-items: baseline;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
}

.plan-currency {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.plan-price {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    color: var(--text-primary);
}

.plan-period {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-left: 6px;
}

.plan-features-list {
    list-style: none;
    margin-bottom: 35px;
    flex-grow: 1;
}

.plan-feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.plan-feature-item.disabled {
    color: var(--text-muted);
    text-decoration: line-through;
}

.plan-feature-item i {
    font-size: 1rem;
}

.plan-feature-item .icon-check {
    color: var(--neon-blue);
}

.plan-feature-item .icon-cross {
    color: var(--neon-red);
}

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

/* User Reviews Section */
.reviews-section {
    padding: 100px 0;
    position: relative;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-card {
    padding: 30px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

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

.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid rgba(124, 58, 237, 0.3);
    object-fit: cover;
}

.review-username {
    font-weight: 600;
    font-size: 0.95rem;
}

.review-verified {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--neon-green);
    margin-top: 2px;
}

.review-stars {
    color: var(--neon-orange);
    display: flex;
    gap: 2px;
    font-size: 0.85rem;
}

.review-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-style: italic;
    flex-grow: 1;
    line-height: 1.7;
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
    position: relative;
}

.faq-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question-btn {
    width: 100%;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    text-align: left;
    color: var(--text-primary);
    cursor: pointer;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition-fast);
}

.faq-question-btn:hover {
    color: var(--neon-purple);
}

.faq-answer-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.4s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    border-top: 1px solid transparent;
}

.faq-item.active .faq-answer-panel {
    max-height: 200px; /* arbitrary height to slide down */
    padding: 0 24px 24px 24px;
    border-color: rgba(255, 255, 255, 0.05);
}

.faq-icon-arrow {
    font-size: 1.2rem;
    transition: transform 0.4s ease;
    color: var(--text-muted);
}

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

/* Knowledge Base / Tutorials Section */
.articles-section {
    padding: 100px 0;
    position: relative;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.article-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.article-tag {
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    color: var(--neon-blue);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.article-card h3 {
    font-size: 1.05rem;
    line-height: 1.4;
    margin-bottom: 12px;
    flex-grow: 1;
}

.article-card h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.article-card:hover h3 a {
    color: var(--neon-purple);
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 20px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-link-btn {
    color: var(--neon-purple);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition-fast);
}

.article-link-btn:hover {
    color: var(--text-primary);
    transform: translateX(4px);
}

/* Call to Action Banner */
.cta-banner-section {
    padding: 80px 0;
    position: relative;
}

.cta-box {
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(6, 182, 212, 0.1) 0%, transparent 60%),
                radial-gradient(circle at bottom left, rgba(124, 58, 237, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.cta-title {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.cta-subtitle {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 30px auto;
    font-size: 1.05rem;
}

/* Footer styling */
.footer {
    background: #04020a;
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo-area p {
    color: var(--text-secondary);
    margin-top: 12px;
    font-size: 0.9rem;
    max-width: 320px;
}

.footer-links-title {
    font-size: 1rem;
    margin-bottom: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

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

.footer-link-item {
    margin-bottom: 10px;
}

.footer-link-item a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.footer-link-item a:hover {
    color: var(--neon-purple);
}

.footer-keywords {
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.footer-keywords-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: 600;
}

.keyword-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.keyword-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 3px 8px;
    border-radius: 4px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-copyright {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.footer-disclaimer {
    max-width: 500px;
    text-align: right;
    line-height: 1.5;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.5);
}

/* Inner Article Page Layout Style */
.article-page {
    padding: 140px 0 80px 0;
}

.article-container {
    max-width: 900px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 30px;
}

.article-title {
    font-size: 2.8rem;
    line-height: 1.25;
    margin-bottom: 20px;
}

.article-page-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.article-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: #E2E8F0;
}

.article-body h2 {
    font-size: 1.8rem;
    margin: 40px 0 20px 0;
    color: var(--text-primary);
    border-left: 4px solid var(--neon-purple);
    padding-left: 15px;
}

.article-body h3 {
    font-size: 1.4rem;
    margin: 30px 0 15px 0;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 20px;
}

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

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

.article-body strong {
    color: #FFFFFF;
}

.article-body blockquote {
    background: rgba(124, 58, 237, 0.05);
    border-left: 4px solid var(--neon-blue);
    padding: 15px 20px;
    margin: 25px 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: var(--text-secondary);
}

.article-body img {
    max-width: 100%;
    border-radius: 8px;
    margin: 20px 0;
}

.article-callout {
    background: var(--bg-card);
    border: 1px dashed var(--border-hover);
    padding: 30px;
    border-radius: 12px;
    margin: 40px 0;
    text-align: center;
}

.article-callout h4 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.article-sidebar {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* RESPONSIVE DESIGN - BREAKPOINTS */

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero-title {
        font-size: 3rem;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    .nodes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .reviews-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: block;
    }
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: #080516;
        flex-direction: column;
        align-items: center;
        padding-top: 50px;
        transition: var(--transition-smooth);
        z-index: 999;
    }
    .nav-menu.active {
        left: 0;
    }
    .nav-actions {
        display: none; /* simple mobile design */
    }
    .hero-wrapper {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    .hero-content {
        margin: 0 auto;
    }
    .hero-buttons {
        justify-content: center;
    }
    .hero-stats {
        justify-content: center;
    }
    .nodes-grid {
        grid-template-columns: 1fr;
    }
    .nodes-board-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    .nodes-board-footer {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    .footer-top {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-logo-area p {
        margin: 12px auto 0 auto;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    .footer-disclaimer {
        text-align: center;
    }
    .article-title {
        font-size: 2.2rem;
    }
    .article-page-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.3rem;
    }
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    .hero-buttons .btn {
        width: 100%;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .articles-grid {
        grid-template-columns: 1fr;
    }
    .section-title {
        font-size: 2rem;
    }
    .nodes-board {
        padding: 20px 15px;
    }
    .node-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .node-status-area {
        text-align: left;
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
}