:root {
    --bg-dark: #0a0a1a;
    --bg-card: #12122a;
    --bg-input: #1a1a3e;
    --accent: #6c5ce7;
    --accent-glow: rgba(108, 92, 231, 0.3);
    --green: #00b894;
    --yellow: #fdcb6e;
    --orange: #e17055;
    --red: #d63031;
    --text: #e8e8f0;
    --text-dim: #8888aa;
    --border: #2a2a4e;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text);
    line-height: 1.6;
}

/* Nav */
.navbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 2rem; border-bottom: 1px solid var(--border);
    position: sticky; top: 0; background: rgba(10,10,26,0.95); backdrop-filter: blur(10px);
    z-index: 100;
}
.nav-brand { display: flex; align-items: center; gap: 0.5rem; }
.logo { font-size: 1.5rem; }
.brand-name { font-size: 1.25rem; font-weight: 700; }
.badge {
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    color: white; font-size: 0.65rem; padding: 2px 6px; border-radius: 4px; font-weight: 700;
}
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a { color: var(--text-dim); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* Hero */
.hero { text-align: center; padding: 5rem 2rem 3rem; }
.hero h1 { font-size: 3.5rem; font-weight: 800; margin-bottom: 1rem; }
.highlight {
    background: linear-gradient(135deg, var(--green), #00cec9);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.subtitle { font-size: 1.2rem; color: var(--text-dim); max-width: 600px; margin: 0 auto 2rem; }
.hero-stats { display: flex; justify-content: center; gap: 3rem; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.8rem; color: var(--text-dim); }

/* Checker */
.checker {
    max-width: 700px; margin: 0 auto; padding: 2rem;
    text-align: center;
}
.checker h2 { font-size: 1.8rem; margin-bottom: 0.5rem; }
.checker-desc { color: var(--text-dim); margin-bottom: 1.5rem; }
.check-form { display: flex; flex-direction: column; gap: 0.75rem; }
.input-group { display: flex; gap: 0.5rem; }
.input-group input {
    flex: 1; padding: 0.85rem 1rem; border-radius: 8px; border: 1px solid var(--border);
    background: var(--bg-input); color: var(--text); font-size: 1rem;
    font-family: monospace;
}
.input-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.input-group select {
    padding: 0.85rem; border-radius: 8px; border: 1px solid var(--border);
    background: var(--bg-input); color: var(--text); font-size: 0.9rem;
}
.input-group button {
    padding: 0.85rem 1.5rem; border-radius: 8px; border: none;
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    color: white; font-weight: 700; font-size: 1rem; cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}
.input-group button:hover { transform: translateY(-1px); box-shadow: 0 4px 15px var(--accent-glow); }
.free-note { font-size: 0.8rem; color: var(--text-dim); }

/* Result */
.result {
    margin-top: 2rem; padding: 2rem; border-radius: 12px;
    background: var(--bg-card); border: 1px solid var(--border);
    text-align: left;
}
.result-header { display: flex; align-items: center; gap: 2rem; margin-bottom: 1.5rem; }
.risk-gauge { position: relative; width: 120px; height: 120px; flex-shrink: 0; }
.risk-gauge svg { transform: rotate(-90deg); }
#gauge-arc { transition: stroke-dashoffset 1s ease-out, stroke 0.5s; }
.gauge-text {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    text-align: center;
}
.gauge-score { display: block; font-size: 1.8rem; font-weight: 800; }
.gauge-label { font-size: 0.7rem; color: var(--text-dim); }
.result-meta { flex: 1; }
.risk-level-badge {
    display: inline-block; padding: 4px 12px; border-radius: 20px;
    font-weight: 700; font-size: 0.85rem; text-transform: uppercase; margin-bottom: 0.5rem;
}
.risk-level-badge.low { background: rgba(0,184,148,0.15); color: var(--green); }
.risk-level-badge.medium { background: rgba(253,203,110,0.15); color: var(--yellow); }
.risk-level-badge.high { background: rgba(225,112,85,0.15); color: var(--orange); }
.risk-level-badge.critical { background: rgba(214,48,49,0.15); color: var(--red); }
.address-display { font-family: monospace; font-size: 0.9rem; color: var(--text-dim); word-break: break-all; }
.chain-display { font-size: 0.8rem; color: var(--text-dim); margin-top: 0.25rem; }

.ai-analysis {
    padding: 1rem; border-radius: 8px; background: var(--bg-input);
    margin-bottom: 1rem; font-size: 0.95rem; line-height: 1.7;
    border-left: 3px solid var(--accent);
}

.findings h4 { margin-bottom: 0.5rem; font-size: 0.9rem; color: var(--text-dim); }
.finding {
    padding: 0.75rem 1rem; border-radius: 6px; background: var(--bg-input);
    margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.75rem;
}
.finding-severity {
    font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
    padding: 2px 8px; border-radius: 4px; white-space: nowrap;
}
.finding-severity.high { background: rgba(214,48,49,0.2); color: var(--red); }
.finding-severity.medium { background: rgba(253,203,110,0.2); color: var(--yellow); }
.finding-severity.critical { background: rgba(214,48,49,0.3); color: var(--red); }
.finding-desc { font-size: 0.9rem; }

/* Loading */
.loading { text-align: center; margin-top: 2rem; }
.spinner {
    width: 40px; height: 40px; border: 3px solid var(--border);
    border-top-color: var(--accent); border-radius: 50%;
    animation: spin 0.8s linear infinite; margin: 0 auto 1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error { color: var(--red); text-align: center; margin-top: 1rem; padding: 1rem; background: rgba(214,48,49,0.1); border-radius: 8px; }

/* Features */
.features { padding: 4rem 2rem; text-align: center; }
.features h2 { font-size: 2rem; margin-bottom: 2rem; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; max-width: 1000px; margin: 0 auto; }
.feature-card {
    padding: 2rem; border-radius: 12px; background: var(--bg-card);
    border: 1px solid var(--border); text-align: left;
    transition: transform 0.2s, border-color 0.2s;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.feature-icon { font-size: 2rem; margin-bottom: 1rem; }
.feature-card h3 { margin-bottom: 0.5rem; }
.feature-card p { color: var(--text-dim); font-size: 0.9rem; }

/* Pricing */
.pricing { padding: 4rem 2rem; text-align: center; }
.pricing h2 { font-size: 2rem; margin-bottom: 2rem; }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; max-width: 900px; margin: 0 auto; }
.pricing-card {
    padding: 2rem; border-radius: 12px; background: var(--bg-card);
    border: 1px solid var(--border); position: relative;
}
.pricing-card.featured { border-color: var(--accent); box-shadow: 0 0 30px var(--accent-glow); }
.popular-badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: var(--accent); color: white; padding: 4px 16px; border-radius: 20px;
    font-size: 0.75rem; font-weight: 700;
}
.price { font-size: 2.5rem; font-weight: 800; margin: 1rem 0; }
.price span { font-size: 1rem; font-weight: 400; color: var(--text-dim); }
.pricing-card ul { list-style: none; margin: 1.5rem 0; text-align: left; }
.pricing-card li { padding: 0.4rem 0; color: var(--text-dim); font-size: 0.9rem; }
.pricing-card li::before { content: "✓ "; color: var(--green); }

.btn-primary {
    display: inline-block; padding: 0.75rem 2rem; border-radius: 8px; border: none;
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    color: white; font-weight: 700; font-size: 0.95rem; cursor: pointer;
    transition: transform 0.15s;
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-secondary {
    display: inline-block; padding: 0.75rem 2rem; border-radius: 8px;
    border: 1px solid var(--border); background: transparent;
    color: var(--text); font-weight: 600; font-size: 0.95rem; cursor: pointer;
    transition: border-color 0.2s;
}
.btn-secondary:hover { border-color: var(--accent); }
.btn-large { padding: 1rem 2.5rem; font-size: 1.1rem; }

/* CTA */
.cta { text-align: center; padding: 4rem 2rem; background: linear-gradient(180deg, transparent, rgba(108,92,231,0.1)); }
.cta h2 { font-size: 2rem; margin-bottom: 0.5rem; }
.cta p { color: var(--text-dim); margin-bottom: 1.5rem; }

/* Footer */
footer { text-align: center; padding: 2rem; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 0.85rem; }
.footer-links { margin-top: 0.5rem; }
.footer-links a { color: var(--text-dim); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

@media (max-width: 600px) {
    .hero h1 { font-size: 2rem; }
    .input-group { flex-direction: column; }
    .result-header { flex-direction: column; text-align: center; }
    .nav-links { display: none; }
}