/* 精灵学院 (Elf Academy) Design System */
:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-white: #ffffff;
    --bg-gray: #f8fafc;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

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

/* Background Animation */
#canvas-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, #ffffff 0%, #f0f4ff 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
header {
    padding: 1.5rem 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-primary {
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Hero Section */
.hero {
    padding: 8rem 0 6rem;
    text-align: center;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #4f46e5, #9333ea);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

/* Pricing Section */
.pricing {
    padding: 6rem 0;
    background: var(--bg-gray);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 4rem;
}

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

.pricing-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1.5rem;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
    border: 2px solid var(--primary);
}

.pricing-card.popular::after {
    content: "最受欢迎";
    position: absolute;
    top: 1rem;
    right: -2rem;
    background: var(--primary);
    color: white;
    padding: 0.25rem 3rem;
    transform: rotate(45deg);
    font-size: 0.75rem;
    font-weight: bold;
}

.plan-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

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

.plan-features {
    list-style: none;
    margin: 2rem 0;
}

.plan-features li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.plan-features li::before {
    content: "✓";
    color: var(--primary);
    font-weight: bold;
}

/* Node Status */
.nodes {
    padding: 6rem 0;
}

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.node-card {
    background: white;
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #22c55e;
    box-shadow: 0 0 10px #22c55e;
}

.latency {
    font-family: monospace;
    font-weight: bold;
    color: var(--primary);
}

/* Articles Section */
.articles {
    padding: 6rem 0;
    background: var(--bg-gray);
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.article-card {
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: scale(1.02);
}

.article-content {
    padding: 1.5rem;
}

.article-content h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.article-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.read-more {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

/* Footer */
footer {
    padding: 4rem 0;
    background: white;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .nav-links {
        display: none;
    }
}