.qs-wrap {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 8px 0 24px;
}

.qs-desc {
    font-size: 14px;
    color: #6b7280;
    margin: 0 0 16px;
    line-height: 1.6;
}

.qs-calc {
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
}

.qs-screen {
    padding: 16px 18px;
    background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
    border-bottom: 1px solid #e5e7eb;
}

.qs-screen-label {
    font-size: 12px;
    color: #64748b;
    margin-bottom: 6px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.qs-chain {
    min-height: 28px;
    font-size: 16px;
    color: #1f2937;
    line-height: 1.5;
    margin-bottom: 14px;
    word-break: break-all;
}

.qs-chain.is-empty {
    color: #94a3b8;
    font-size: 14px;
}

.qs-result {
    min-height: 32px;
    font-size: 22px;
    font-weight: 600;
    color: #2563eb;
    line-height: 1.4;
    word-break: break-all;
}

.qs-result.is-placeholder {
    color: #94a3b8;
    font-weight: 500;
    font-size: 20px;
}

.qs-keypad {
    padding: 14px 16px 4px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.qs-key-group {
    display: grid;
    grid-template-columns: 56px 1fr 1fr;
    gap: 8px;
    align-items: center;
}

.qs-group-label {
    font-size: 13px;
    color: #6b7280;
    text-align: center;
}

.qs-key {
    height: 40px;
    border: 1px solid #dbeafe;
    background: #f8fbff;
    color: #1e40af;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.qs-key:hover:not(:disabled) {
    background: #eff6ff;
    border-color: #3b82f6;
    color: #1d4ed8;
}

.qs-key:active:not(:disabled) {
    background: #dbeafe;
}

.qs-key:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: #f3f4f6;
    border-color: #e5e7eb;
    color: #9ca3af;
}

.qs-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    padding: 8px 16px 16px;
}

.qs-btn {
    padding: 7px 18px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    background: transparent;
    line-height: 1.4;
    transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.qs-btn-outline {
    border: 1px solid #3b82f6;
    color: #3b82f6;
}

.qs-btn-outline:hover {
    background: #eff6ff;
    border-color: #2563eb;
    color: #2563eb;
}

.qs-btn-ghost {
    border: 1px solid #d1d5db;
    color: #6b7280;
}

.qs-btn-ghost:hover {
    border-color: #9ca3af;
    color: #374151;
    background: #f9fafb;
}

.qs-intro {
    margin-top: 20px;
    padding: 14px 16px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
}

.qs-intro-title {
    font-size: 14px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 8px;
}

.qs-intro ul {
    margin: 0;
    padding-left: 18px;
    color: #6b7280;
    font-size: 13px;
    line-height: 1.8;
}

@media (max-width: 480px) {
    .qs-key-group {
        grid-template-columns: 44px 1fr 1fr;
    }

    .qs-group-label {
        font-size: 12px;
    }

    .qs-key {
        height: 38px;
        font-size: 13px;
    }

    .qs-result {
        font-size: 20px;
    }
}