:root {
    --bg-dark: #121824;
    --panel-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --construction-yellow: #eab308;
    --construction-yellow-hover: #ca8a04;
    --border: #334155;
    --input-bg: #0f172a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    margin: 0;
    padding: 15px;
    display: flex;
    justify-content: center;
}

.app-container {
    max-width: 900px;
    width: 100%;
    margin-top: 10px;
}

header h1 {
    font-size: 2rem;
    color: var(--construction-yellow);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

h2 {
    font-size: 1.2rem;
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 8px;
    letter-spacing: 0.3px;
}

.selector-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 600px) {
    .selector-group {
        grid-template-columns: 1fr;
    }
}

.input-field {
    display: flex;
    flex-direction: column;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
}

select {
    background-color: var(--input-bg);
    color: white;
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    appearance: none;
}

select:focus {
    outline: none;
    border-color: var(--construction-yellow);
}

select:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.info-label {
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    font-weight: 700;
    color: white;
}

.filter-section-block {
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 15px;
}

.filter-section-block h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--construction-yellow);
}

.filter-code-row {
    font-size: 0.9rem;
    margin-bottom: 12px;
    color: var(--text-muted);
}

.filter-code-row span {
    color: white;
    font-weight: 600;
}

.filter-btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

@media (max-width: 480px) {
    .filter-btn-grid {
        grid-template-columns: 1fr;
    }
}

.amazon-btn {
    display: block;
    text-align: center;
    background-color: var(--border);
    color: white;
    padding: 10px 5px;
    font-size: 0.8rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.15s, color 0.15s;
    border: 1px solid transparent;
}

.amazon-btn:hover {
    background-color: var(--construction-yellow);
    color: #000;
}

.hidden {
    display: none;
}