:root {
    --primary-dark: #1a2b3c;
    --accent-blue: #2c3e50;
    --bg-light: #f4f7f9;
    --text-dark: #2c3e50;
    --text-gray: #5e6d7a;
    --border-color: #d1d9e0;
    --success: #27ae60;
    --error: #e74c3c;
}

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

body {
    font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

header {
    background: var(--primary-dark);
    color: white;
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-weight: 700; font-size: 1.1rem; letter-spacing: 0.5px; }
.system-status { font-size: 0.8rem; opacity: 0.7; }

.container {
    max-width: 960px;
    margin: 40px auto;
    padding: 0 20px;
}

.hero-box {
    background: white;
    padding: 30px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
}

h1 { font-size: 1.5rem; margin-bottom: 15px; color: var(--primary-dark); }

.description-block {
    font-size: 0.95rem;
    color: var(--text-gray);
    margin-bottom: 20px;
    border-left: 3px solid var(--primary-dark);
    padding-left: 20px;
}

.security-warning {
    font-size: 0.85rem;
    color: var(--error);
    font-weight: 600;
}

.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.node-card {
    background: white;
    border: 1px solid var(--border-color);
    padding: 25px;
    border-radius: 4px;
}

.node-card h2 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--primary-dark);
}

.node-meta {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    margin-right: 8px;
}

.status-text {
    font-size: 0.8rem;
    color: var(--text-gray);
}

.btn {
    display: block;
    width: 100%;
    padding: 12px;
    text-align: center;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    margin-bottom: 10px;
    cursor: pointer;
    transition: 0.2s;
}

.btn-primary {
    background: var(--primary-dark);
    color: white;
    border: none;
}

.btn-primary:hover { background: var(--accent-blue); }

.btn-outline {
    background: transparent;
    color: var(--primary-dark);
    border: 1px solid var(--primary-dark);
}

.btn-outline:hover { background: #f8fafc; }

.main-footer {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-gray);
}

.toast-notification {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #2c3e50;
    color: white;
    padding: 12px 30px;
    border-radius: 4px;
    font-size: 0.85rem;
    opacity: 0;
    transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.toast-notification.show { opacity: 1; transform: translateX(-50%) translateY(0); }