:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-darker: #070a10;
    --bg-card: rgba(17, 24, 39, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(59, 130, 246, 0.4);
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.25);
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.2);
    --warning: #f59e0b;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    height: 72px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
}

.logo-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: var(--accent-gradient);
    border-radius: 8px;
    color: #ffffff;
}

.cluster-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 12px;
    color: #34d399;
    letter-spacing: 0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.btn-sm {
    padding: 8px 18px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-sm:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.hero {
    padding: 90px 0 70px;
    text-align: center;
    background: radial-gradient(circle at 50% 15%, rgba(59, 130, 246, 0.18), transparent 65%);
}

.hero-status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: 999px;
    color: #6ee7b7;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 24px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
    font-size: 50px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.025em;
    margin-bottom: 20px;
    background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 720px;
    margin: 0 auto 36px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.btn {
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
    box-shadow: 0 6px 28px rgba(59, 130, 246, 0.5);
    transform: translateY(-1px);
}

.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, 0.08);
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 960px;
    margin: 0 auto;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px 16px;
    backdrop-filter: blur(8px);
    transition: border-color 0.2s;
}

.metric-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
}

.metric-val {
    font-size: 30px;
    font-weight: 800;
    color: #60a5fa;
    margin-bottom: 4px;
    font-variant-numeric: tabular-nums;
}

.metric-lbl {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 2px;
}

.metric-sub {
    font-size: 12px;
    color: var(--text-muted);
}

/* Section styling */
.section {
    padding: 80px 0;
}

.section-dark {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.015em;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

/* Telemetry Dashboard */
.telemetry-dashboard {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    backdrop-filter: blur(10px);
}

.telemetry-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.telemetry-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.badge-tag {
    font-size: 12px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
}

.telemetry-refresh {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #34d399;
    font-weight: 500;
}

.pulse-dot {
    width: 6px;
    height: 6px;
    background: #10b981;
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.node-cell {
    background: rgba(10, 14, 23, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    transition: all 0.2s ease;
}

.node-cell:hover {
    border-color: rgba(59, 130, 246, 0.35);
    background: rgba(10, 14, 23, 0.85);
}

.node-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.node-id {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.node-role {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.node-role.leader {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

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

.node-metric {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-family: var(--font-mono);
}

.node-metric strong {
    color: var(--text-primary);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
}

.card-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

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

.card-tags span {
    font-size: 11px;
    font-weight: 500;
    padding: 3px 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #93c5fd;
}

/* Code container & tabs */
.code-container {
    max-width: 860px;
    margin: 0 auto;
    background: #070a10;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.code-tabs {
    display: flex;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.tab-btn {
    padding: 14px 22px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: #60a5fa;
    border-bottom-color: #3b82f6;
    background: rgba(59, 130, 246, 0.05);
}

.code-panel {
    display: none;
    padding: 20px 24px;
}

.code-panel.active {
    display: block;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    font-size: 13px;
    color: var(--text-muted);
}

.copy-btn {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 4px 12px;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
}

pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    overflow-x: auto;
    color: #e2e8f0;
}

.c-comment { color: #64748b; font-style: italic; }
.c-flag { color: #f59e0b; }
.c-keyword { color: #c084fc; }
.c-str { color: #34d399; }
.c-key { color: #60a5fa; }
.c-func { color: #38bdf8; }

/* Security Banner */
.security-banner {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
}

.security-icon {
    font-size: 48px;
    flex-shrink: 0;
}

.security-text h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.security-text p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    background: #070a10;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
}

.footer-logo {
    color: var(--text-primary);
    margin-bottom: 6px;
}

.footer-right {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: right;
}

.footer-right code {
    font-family: var(--font-mono);
    color: #60a5fa;
}

/* Modal */
.modal-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-backdrop.open {
    display: flex;
}

.modal-dialog {
    background: #111827;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    background: #0a0e17;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-mono);
}

.form-group input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.auth-alert {
    padding: 12px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 16px;
    line-height: 1.4;
}

.auth-alert.error {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.auth-alert.hidden {
    display: none;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title { font-size: 34px; }
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    .nodes-grid { grid-template-columns: repeat(2, 1fr); }
    .cards-grid { grid-template-columns: 1fr; }
    .nav-links a { display: none; }
    .footer-content { flex-direction: column; text-align: center; gap: 16px; }
    .footer-right { text-align: center; }
    .security-banner { flex-direction: column; text-align: center; }
}