:root {
    --bg-dark: #0f172a;
    --panel-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-amber: #f59e0b;
    --accent-amber-hover: #d97706;
    --accent-crimson: #ef4444;
    --accent-green: #10b981;
    --border: #334155;
    --input-bg: #0b1120;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.calculator-container {
    max-width: 1000px;
    width: 100%;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-muted);
    margin-top: 0;
    margin-bottom: 25px;
    font-size: 0.95rem;
    line-height: 1.5;
}

.grid-layout {
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    gap: 25px;
    margin-bottom: 30px;
}

@media (max-width: 820px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background-color: var(--panel-bg);
    padding: 24px;
    border-radius: 10px;
    border: 1px solid var(--border);
}

h2 {
    font-size: 1.25rem;
    margin-top: 0;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 10px;
}

.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 16px;
}

label {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
}

input, select {
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    color: white;
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 0.95rem;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-amber);
}

small {
    color: var(--text-muted);
    margin-top: 4px;
    font-size: 0.78rem;
    line-height: 1.4;
}

.metric-box {
    background-color: var(--input-bg);
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 14px;
    border-left: 4px solid var(--border);
}

.metric-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-value {
    font-size: 1.55rem;
    font-weight: 800;
}

.highlight {
    color: var(--accent-amber);
}

.system-box {
    border-left-color: var(--accent-green);
    background: linear-gradient(135deg, var(--input-bg) 0%, #064e3b 100%);
}

.system-highlight {
    color: #34d399;
}

.affiliate-section {
    border-top: 1px solid var(--border);
    padding-top: 28px;
}

.affiliate-section h3 {
    margin-top: 0;
    margin-bottom: 18px;
    font-size: 1.15rem;
}

.affiliate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.affiliate-card {
    background-color: var(--panel-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

.card-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    font-weight: 700;
}

.affiliate-card h4 {
    margin-top: 10px;
    margin-bottom: 8px;
    color: var(--accent-amber);
    font-size: 1.05rem;
}

.affiliate-card p {
    font-size: 0.84rem;
    color: var(--text-muted);
    line-height: 1.45;
    margin-bottom: 18px;
}

.affiliate-btn {
    display: block;
    text-align: center;
    background-color: var(--input-bg);
    color: white;
    padding: 10px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 700;
    text-decoration: none;
    border: 1px solid var(--border);
    transition: background 0.15s, color 0.15s;
}

.affiliate-btn:hover {
    background-color: var(--accent-amber);
    color: #0b1120;
}

.legal-disclaimer-section {
    margin-top: 40px;
    border-top: 1px solid var(--border);
    padding-top: 20px;
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.legal-disclaimer-section p {
    margin-bottom: 8px;
}