/* CSS Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
    /* NOT BLACK: Premium deep navy space theme background */
    --bg-dark: #0d1225; 
    --bg-card: rgba(20, 26, 48, 0.6);
    --bg-card-hover: rgba(30, 39, 70, 0.85);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-color-hover: rgba(0, 242, 254, 0.4);
    
    --primary-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
    --secondary-gradient: linear-gradient(135deg, #7f00ff 0%, #e100ff 100%);
    --accent-glow: 0 0 20px rgba(0, 242, 254, 0.15);
    
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-cyan: #00f2fe;
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    /* High-Definition Premium Cloud-VPN Background Overlayed with Navy Gradient */
    background-image: linear-gradient(rgba(13, 18, 37, 0.85), rgba(13, 18, 37, 0.85)), url('../images/cloud_bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    color: var(--text-main);
    font-family: var(--font-body);
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
}

/* Background Emoji/Elements Pattern */
.emoji-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    pointer-events: none;
    overflow: hidden;
}

.floating-emoji {
    position: absolute;
    font-size: 2.5rem;
    opacity: 0.06;
    user-select: none;
    animation: floatAround 25s infinite linear;
}

@keyframes floatAround {
    0% {
        transform: translateY(105vh) translateX(0) rotate(0deg);
    }
    50% {
        transform: translateY(50vh) translateX(50px) rotate(180deg);
    }
    100% {
        transform: translateY(-10vh) translateX(-50px) rotate(360deg);
    }
}

/* Horizontal Drifting Clouds (自动可以走动的背景云朵) */
@keyframes driftHorizontal {
    0% {
        transform: translateX(-400px) scale(0.85);
        opacity: 0;
    }
    10% {
        opacity: 0.5;
    }
    90% {
        opacity: 0.5;
    }
    100% {
        transform: translateX(105vw) scale(1.15);
        opacity: 0;
    }
}

/* Cursor Trail Canvas */
#cursor-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    pointer-events: none;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-cyan);
}

/* Header & Navigation */
header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    background: rgba(13, 18, 37, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

/* SLEEK LOGO SVG */
.logo-svg {
    width: 32px;
    height: 32px;
    stroke: #00f2fe;
    filter: drop-shadow(0 0 6px rgba(0, 242, 254, 0.6));
    transition: var(--transition-smooth);
}

.logo:hover .logo-svg {
    transform: rotate(-10deg) scale(1.1);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

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

.nav-cta {
    background: var(--primary-gradient);
    color: #000 !important;
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-weight: 600 !important;
    box-shadow: var(--accent-glow);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(0, 242, 254, 0.45);
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem 2rem;
    position: relative;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    z-index: 10;
}

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid rgba(0, 242, 254, 0.2);
    border-radius: 50px;
    color: var(--text-cyan);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
    animation: pulseGlow 2s infinite ease-in-out;
}

@keyframes pulseGlow {
    0%, 100% { opacity: 0.8; box-shadow: 0 0 5px rgba(0, 242, 254, 0.1); }
    50% { opacity: 1; box-shadow: 0 0 15px rgba(0, 242, 254, 0.3); }
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    color: #fff;
}

.hero h1 span {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 3rem auto;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.9rem 2.2rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #050608;
    box-shadow: var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

/* Features Section */
.section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-header h2 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0, 242, 254, 0.03) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition-smooth);
}

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

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

/* SVG ICON SYSTEM FOR FEATURE CARDS */
.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.card-icon svg {
    width: 100%;
    height: 100%;
    stroke: #00f2fe;
    filter: drop-shadow(0 0 6px rgba(0, 242, 254, 0.5));
    transition: var(--transition-smooth);
}

.card:hover .card-icon svg {
    transform: scale(1.1);
    stroke: #4facfe;
    filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.8));
}

.card h3 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    color: #fff;
    margin-bottom: 1rem;
}

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

/* Status light for feature cards (图2的库里面要有灯) */
.card-status-light {
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
}

/* Pricing Section (一排布局) */
.pricing-container {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: nowrap; /* Force single row on desktop */
    margin-top: 3rem;
    width: 100%;
}

.pricing-card {
    flex: 1;
    min-width: 220px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3.5rem 1.5rem 2.5rem 1.5rem;
    text-align: center;
    transition: var(--transition-smooth);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.pricing-card.popular {
    border-color: var(--text-cyan);
    box-shadow: 0 0 25px rgba(0, 242, 254, 0.1);
    transform: scale(1.03);
}

.pricing-card.popular:hover {
    transform: translateY(-8px) scale(1.05);
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--text-cyan);
    box-shadow: var(--accent-glow);
}

.pricing-tag {
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
    background: var(--primary-gradient);
    color: #000;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
}

.pricing-card h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.pricing-price {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.5rem;
}

.pricing-price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-muted);
}

.pricing-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 2.5rem;
    flex-grow: 1;
}

.pricing-features li {
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.pricing-features li::before {
    content: '✓';
    color: var(--text-cyan);
    font-weight: bold;
}

.pricing-features li.disabled {
    color: var(--text-muted);
    text-decoration: line-through;
    opacity: 0.5;
}

.pricing-features li.disabled::before {
    content: '✕';
    color: #ef4444;
}

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

/* Blinking LED Indicators for Cards (有亮下亮下的指示灯) */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    padding: 3px 8px;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: absolute;
    top: 1.2rem;
    left: 1.2rem;
}

.status-dot {
    width: 10px; /* Made larger for maximum visibility */
    height: 10px;
    border-radius: 50%;
    background-color: #10b981; 
    box-shadow: 0 0 8px #10b981;
    animation: blinkSlow 1.2s infinite ease-in-out; /* High contrast blink animation */
}

/* Testimonial Blinking Cyan Light */
.testimonial-status {
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.4);
    background: rgba(0, 242, 254, 0.03);
    padding: 3px 8px;
    border-radius: 50px;
    border: 1px solid rgba(0, 242, 254, 0.1);
}

.secure-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #00f2fe; 
    box-shadow: 0 0 8px #00f2fe;
    animation: blinkBlue 1s infinite ease-in-out;
}

/* Global Server Node Library - Forced Single Row layout (一排的格式) */
.node-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
    margin-top: 2rem;
    margin-bottom: 4rem;
    width: 100%;
}

.node-card {
    background: rgba(20, 26, 48, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.2rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 250px;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
}

.node-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0.7;
}

.node-card:hover {
    border-color: var(--border-color-hover);
    background: rgba(30, 39, 70, 0.5);
    transform: translateY(-4px);
    box-shadow: var(--accent-glow);
}

.node-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.node-name {
    font-family: var(--font-heading);
    font-size: 0.92rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 6px;
}

.node-flag {
    font-size: 1rem;
}

.node-ping {
    font-size: 0.8rem;
    color: #10b981; /* Green */
    font-weight: 700;
    font-family: var(--font-heading);
}

.node-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
    justify-content: center;
}

.node-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
    text-align: left;
}

.node-footer {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    width: 100%;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.node-type {
    font-size: 0.7rem;
    color: var(--text-cyan);
    font-weight: 500;
}

/* Dual Router Blinking Lights (Saturated colors - 亮下亮下的核心设计) */
.node-led-panel {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.05);
    padding: 3px 6px;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    width: 100%;
    justify-content: space-between;
}

.node-led-container {
    display: flex;
    gap: 5px;
    align-items: center;
}

.node-led {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

/* Green system status LED (Blinks slowly) */
.node-led.green {
    background-color: #10b981;
    box-shadow: 0 0 6px #10b981;
    animation: blinkSlow 1.2s infinite ease-in-out;
}

/* Amber data traffic LED (Flashes rapidly) */
.node-led.yellow {
    background-color: #d97706;
    box-shadow: 0 0 6px #d97706;
}

/* Rapid flash speed variants */
.flash-fast-1 { animation: flashFast 0.35s infinite ease-in-out; }
.flash-fast-2 { animation: flashFast 0.45s infinite ease-in-out; animation-delay: 0.05s; }
.flash-fast-3 { animation: flashFast 0.3s infinite ease-in-out; animation-delay: 0.1s; }
.flash-fast-4 { animation: flashFast 0.5s infinite ease-in-out; animation-delay: 0.15s; }
.flash-fast-5 { animation: flashFast 0.28s infinite ease-in-out; animation-delay: 0.08s; }
.flash-fast-6 { animation: flashFast 0.4s infinite ease-in-out; animation-delay: 0.2s; }

/* HIGH CONTRAST BLINKING KEYFRAMES (亮下亮下核心效果，暗时有颜色，亮时极亮) */
@keyframes blinkSlow {
    0%, 100% {
        background-color: #047857; /* Dark Emerald Green */
        box-shadow: none;
        filter: brightness(0.5);
    }
    50% {
        background-color: #00ff88; /* Extremely bright neon green */
        box-shadow: 0 0 10px #00ff88, 0 0 20px #00ff88;
        filter: brightness(1.5);
    }
}

@keyframes flashFast {
    0%, 100% {
        background-color: #78350f; /* Dark Amber */
        box-shadow: none;
        filter: brightness(0.4);
    }
    50% {
        background-color: #ffb700; /* Extremely bright yellow/amber */
        box-shadow: 0 0 10px #ffb700, 0 0 20px #ffb700;
        filter: brightness(1.5);
    }
}

@keyframes blinkBlue {
    0%, 100% {
        background-color: #0369a1; /* Dark Blue */
        box-shadow: none;
        filter: brightness(0.5);
    }
    50% {
        background-color: #00f2fe; /* Extremely bright neon cyan */
        box-shadow: 0 0 10px #00f2fe, 0 0 20px #00f2fe;
        filter: brightness(1.5);
    }
}

/* Articles Section */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

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

/* FEATURED IMAGES FOR ARTICLE CARDS */
.article-image-wrapper {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    background-color: rgba(0, 0, 0, 0.2);
}

.article-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.article-card:hover .article-image-wrapper img {
    transform: scale(1.05);
}

.article-body {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-grow: 1;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-cyan);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 0.8rem;
}

.article-body h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: #fff;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.article-body h3 a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.article-body h3 a:hover {
    color: var(--text-cyan);
}

.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.article-link {
    color: #fff;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition-smooth);
}

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

.article-link::after {
    content: '→';
    transition: var(--transition-smooth);
}

.article-link:hover::after {
    transform: translateX(4px);
}

/* Single Article Layout */
.article-page {
    padding-top: 8rem;
}

.article-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.article-header {
    text-align: center;
    margin-bottom: 2rem;
}

.article-header h1 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    color: #fff;
    margin-bottom: 1.5rem;
    line-height: 1.25;
}

/* FEATURED BANNER ON SINGLE PAGES */
.article-banner {
    width: 100%;
    aspect-ratio: 21 / 9;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 2.5rem;
    border: 1px solid var(--border-color);
}

.article-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-post-meta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.article-post-meta span::before {
    content: '•';
    margin-right: 0.5rem;
    color: var(--text-cyan);
}

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

.article-content p {
    margin-bottom: 1.8rem;
}

.article-content h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    color: #fff;
    margin-top: 3rem;
    margin-bottom: 1.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.article-content h3 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    color: #fff;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article-content ul, .article-content ol {
    margin-bottom: 1.8rem;
    padding-left: 1.5rem;
}

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

.article-content blockquote {
    border-left: 4px solid var(--text-cyan);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
    padding: 1.5rem;
    border-radius: 0 12px 12px 0;
}

.article-content a {
    color: var(--text-cyan);
    text-decoration: underline;
    transition: var(--transition-smooth);
}

.article-content a:hover {
    color: #4facfe;
}

.article-cta {
    margin-top: 4rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 24px;
    text-align: center;
    box-shadow: var(--accent-glow);
}

.article-cta h3 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: #fff;
    margin-bottom: 1rem;
}

.article-cta p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.article-navigation-links {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.article-navigation-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    max-width: 45%;
}

.article-navigation-links a:hover {
    color: var(--text-cyan);
}

/* User Testimonials Carousel Layout (自动可以走动的那种) */
.testimonials-carousel-wrapper {
    overflow: hidden;
    width: 100%;
    position: relative;
    padding: 2rem 0;
    mask-image: linear-gradient(to right, transparent, #000 10%, #000 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, #000 10%, #000 90%, transparent);
}

.testimonials-track {
    display: flex;
    gap: 24px;
    width: max-content;
    animation: marquee 45s linear infinite; /* Seamless automatic scrolling */
}

.testimonials-track:hover {
    animation-play-state: paused; /* Pause on hover for reading */
}

.testimonials-track .testimonial-card {
    width: 320px;
    flex-shrink: 0;
}

@keyframes marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-50% - 12px)); /* Exact half size loop */
    }
}

.testimonial-rating {
    color: #f59e0b; /* Amber */
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.testimonial-content {
    color: var(--text-main);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    font-style: italic;
    line-height: 1.5;
}

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

.testimonial-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-weight: bold;
    font-size: 0.9rem;
}

.testimonial-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
}

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

/* FAQ Accordion - Two Columns on Desktop (2个一排的格式) */
.faq-container {
    max-width: 1200px;
    margin: 3rem auto 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    width: 100%;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 0;
    overflow: hidden;
    transition: var(--transition-smooth);
    align-self: start;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    color: #fff;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-smooth);
}

.faq-question:hover {
    color: var(--text-cyan);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-muted);
    transition: var(--transition-smooth);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
    color: var(--text-cyan);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 1.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.faq-item.active .faq-answer {
    max-height: 350px;
    padding: 0 1.5rem 1.5rem 1.5rem;
}

/* Footer & PBN Weight Links */
footer {
    width: 100%;
    border-top: 1px solid var(--border-color);
    background: #06070a;
    padding: 3rem 2rem;
    margin-top: 6rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.4rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-logo .logo-svg {
    width: 26px;
    height: 26px;
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 500px;
}

.footer-pbn {
    margin-top: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    width: 100%;
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-pbn span {
    opacity: 0.7;
}

.footer-pbn a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.footer-pbn a:hover {
    color: var(--text-cyan);
    text-decoration: underline;
}

.footer-copy {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.3);
    margin-top: 0.5rem;
}

/* Responsive Rules */
@media (max-width: 1200px) {
    .pricing-container {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .pricing-card {
        flex: 0 1 calc(50% - 20px);
        min-width: 250px;
        max-width: 450px;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-8px);
    }
    
    .node-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .faq-container {
        grid-template-columns: 1fr;
        max-width: 800px;
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1.2rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero {
        padding-top: 10rem;
    }
    
    .pricing-card {
        flex: 1 1 100%;
        max-width: 100%;
    }
    
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .node-grid {
        grid-template-columns: 1fr;
    }
    
    .article-navigation-links {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }
    
    .article-navigation-links a {
        max-width: 100%;
        text-align: center;
    }
}